The 6 Best WordPress Image Optimization Plugins Compared

Posted on April 8, 2016 by in Resources | 93 comments

The 6 Best WordPress Image Optimization Plugins Compared

Compelling content is often not enough. Every visitor will use different criteria to judge whether your site is worth their time, but few issues can sink you as quickly as slow load times.

There are a lot of factors which can impact your loading times, and using high-resolution images is one of them. Most of us have experienced what it’s like to navigate through a website full of images that take forever to load – an experience made even more frustrating if you’ve been using the internet long enough to remember when speeds weren’t quite so snappy.

These days, the average fixed internet connection can easily handle high-resolution images, but smartphone usage continues to grow, and mobile connections aren’t nearly as reliable. With that in mind, let’s take a look at six WordPress image optimization plugins that can ensure your site is quick to load!

1. EWWW Image Optimizer

The official EWWW Image Optimizer header.

After installing and setting up EWWW Image Optimizer, it’ll automatically optimize any images you upload to your blog as long as they’re either JPG, PNG, or GIF files. It also includes a function to optimize your entire media catalog, in case you already have lots of images on your site.

One of the advantages of EWWW Image Optimizer is that the optimization process takes place within your own servers by default, instead of connecting to a third party service. This means your optimization tasks will require less time, which can come in handy when tackling large media libraries, since regular-sized files (<1mb) should take a few seconds at the most.

This local optimization process is made possible by including several pre-compiled binaries, which must be installed from your local WordPress folder. This means some users may run into difficulties completing the setup process if they don’t have permission to execute the files.

To combat this potential issue, EWWW Image Optimizer also offers a cloud optimization feature, which while taking a bit longer, enables you to bypass this setup process. It’s also worth noting that while the plugin uses lossless optimization methods by default, it also enables you to apply lossy reductions for even bigger reductions in file size.

2. WP Smush

The official WP Smush header.

WP Smush is WPMU DEV’s image optimization plugin, available in both free and premium formats. As is common with this sort of plugin, any images you upload to your WordPress site will be automatically optimized (or ‘smushed’, as this plugin’s developers like to call it).

The plugin also packs a bulk optimization option, which as its name implies, enables you to tackle multiple tasks at once – perfect if you’re looking to compress your image backlog after installing the plugin. This bulk option is limited to 50 files at a time in the free version of the plugin.

You can also optimize images individually by heading over to your Media Library, clicking on whichever file you want to compress, and clicking on the Smush option on the Attachment Details window. This option can come in handy if for some reason you’d prefer not to use the bulk optimization option and have only a few images you’d like to compress.

By default, WP Smush uses lossless optimization techniques, but its pro version includes a Super-Smush option which optimizes each image multiple times using lossy compression techniques. This method can allegedly cut filesizes almost by half with a minimal loss of quality, but for the purposes of our article, we’re going to be sticking with the free version of the plugin.

3. Kraken Image Optimizer

The official Kraken Image Optimizer header.

The Kraken Image Optimizer enables you to optimize PNG, JPG, and GIF files through its own API. To set up the plugin, you’ll need to sign up for a free account at Kraken.io’s homepage in order to be provided with your own API and secret keys (which can be used across multiple WordPress installations, if so desired).

By default, the Kraken Image Optimizer will optimize your images using an ‘intelligent lossy’ compression profile, which is designed to yield drastic savings without notably impacting image quality. However, you can also manually enable a lossless option on its settings page. On top of these two default profiles, you can set a specific value for the quality of your JPG images, which ranges from 25 to 99 in case you want to test things out a little. During our own tests, we didn’t notice a perceivable difference between the outputs of either mode, but your mileage may vary.

This plugin also includes a useful option which enables you to establish a maximum resolution for your images, so that you won’t need to manually resize them when uploading in order to avoid breaking your pages. EXIF metadata can also be preserved, as the plugin lets you choose which attributes to keep, and finally, you can set a cap on the number of images to be optimized during a bulk process (so as to avoid hitting your requests limits).

4. ShortPixel Image Optimizer

The official ShortPixel Image Optimizer header.

ShortPixel not only scores well when it comes to compression, it also packs a nice interface. After installing and activating the plugin, every JPG, PNG, and GIF you upload will be automatically optimized, and this plugin doesn’t enable you to turn off this option at all, as most others do.

A bulk optimization tool is included, and individual images can be compressed by opening your Media Library in the List View format, where each file will appear with an individual Optimize Now button alongside it.

ShortPixel enables you to choose between lossy and lossless compression methods, using the former by default. It optimizes all of the image thumbnails created by WordPress during the upload process, is capable of removing EXIF data (or preserve it you prefer), can establish a maximum resolution for your images, and best of all, it automatically saves a backup of every image you upload to a new folder.

In order to set up the ShortPixel plugin, you’ll be prompted to enter an API key during the activation process, which is provided for free by signing up with your email to their subscription list and doesn’t require any additional information. A free signup entitles you to 100 image compressions per month, and credits for additional tasks can be purchased separately or earned by referring new users to the service.

5. Compress JPG & PNG Images

The official Compress JPG & PNG header.

Compress JPG & PNG Images is rather more drastic than the other plugins we’ve mentioned on this list when it comes to image optimization. It employs only lossy compression methods, which make for a drastic reduction in filesizes while mostly preserving the quality of the images undergoing the procedure.

The plugin doesn’t offer many configuration options in its settings page, since you can’t modify the compression methods it uses. However, you can choose maximum resolutions for your uploaded images, pick exactly which sizes you want to compress (i.e. thumbnail, medium, etc.), and whether or not to preserve the copyright information of each file if available.

Despite these limitations, Compress JPG & PNG images performs very well when it comes to the optimization process, and our tests didn’t show any obvious reduction in quality of the images after they were processed.

6. Optimus

The official Optimus header.

While Optimus performs admirably when it comes to the actual optimization process, the free version of this plugin includes a rather stifling 100kb file size cap on the images you can process, which essentially renders it a glorified demo.

That being said, Optimus has a simple settings menu, which makes it a good choice if you’re looking for sheer performance and are not interested in fine-tuning the details of the optimization process.

By default, Optimus will (pardon the pun) optimize images as they’re uploaded, but it won’t show the compression details on the Attachment Details window of each file, or in the menu, so you’ll have to manually compare file sizes in order to notice any difference.

This plugin won’t only optimize the files you upload, but also the multiple sized images that WordPress automatically creates for these media files (i.e. thumbnail, small, medium, and large).

Let’s Put Them to the Test

So far we’ve covered each plugin’s individual features, as well as their pros and cons. Now it’s time to see how they actually fare against each other when it comes to their intended purpose: image optimization. We’ve split the actual testing between JPG and PNG files since they’re the most commonly used types of graphic files on most websites, and chosen a single image with an average file size for each.

To get the best possible results, we’ve chosen lossy image optimization when possible, but that proved impossible with WP Smush and Optimus, due to a lack of alternatives. Despite the disparity in the results obtained from these particular plugins, we decided it would be best to include them alongside the rest for the sake of completion, since they remain some of the most popular image optimization tools available for WordPress.

We’d like to remind everyone that these results are far from exhaustive. Your mileage may vary depending on which particular image you choose to optimize, and these findings should be viewed only as an example of how each plugin performs individually.

JPG Optimization

A hand working on a painting.

Our JPG test subject.

Plugin Original File Size Optimized File Size Optimization % Compression Method
EWWW Image Optimizer 531 KB 70.9 KB 87% Lossy
WP Smush 531 KB 488.1 KB 6.3% Lossless
Kraken Image Optimizer 531 KB 61.98 KB 88.31% Lossy
ShortPixel Image Optimizer 531 KB 81 KB 85% Lossy
Compress JPEG & PNG Images 531 KB 64.9 KB 88% Lossy
Optimus 69 KB 52 KB 24.64% Lossless

 

As we can see, the plugins which applied a lossy optimization method obtained roughly similar scores across the board, with Kraken Image Optimizer and Compress JPEG & PNG Images pulling ahead by a very small margin. Due to its slight edge when it comes to the compression percentage (plus all of its additional features), we’re going to recommend you go with Kraken Image Optimizer if you use mostly JPG files on your site.

Compress JPEG & PNG Images comes rather close as well, but it simply lacks the variety of features that Kraken includes. However, if you’re not interested in in-depth configuration options and only want a potent optimization tool, it might be right up your alley.

PNG Optimization

A woman working on a painting.

Our PNG test subject.

Plugin Original Filesize Optimized Filesize Optimization % Compression Method
EWWW Image Optimizer 841 KB 240.8 KB 72.1% Lossy
WP Smush 841 KB Not applicable Not applicable Lossless
Kraken Image Optimizer 841 KB 217.47 KB 74.13% Lossy
ShortPixel Image Optimizer 841 KB 200 KB 71% Lossy
Compress JPG & PNG Images 841 KB 218.8 KB 75% Lossy
Optimus 69 KB 63 KB 8.6% Lossless

 

In this round, ShortPixel Image Optimizer took the lead with a slight advantage over the winners of the last section – once again with no noticeable reduction in the quality of the optimized images.

ShortPixel was one of our favorite plugins to use during the testing phase of this list due to its intuitive settings menu, which included solid descriptions for each feature. Its only downside is that it limits you to a maximum of 100 images per month and you’re required to purchase credits for any additional optimization tasks – same as the runner up, Compress JPG & PNG Images.

Conclusion

While optimizing your images won’t make your site magically load in milliseconds, it’s one of those things that show you take every detail into consideration. Even if the resources you save aren’t substantial to you as far as bandwidth goes (and let’s face it, bandwidth is pretty cheap), visitors with slow connections will definitely be thankful for it.

Just keep in mind that while we may have tested all of these plugins with different images, you will find that the results vary depending on the image you use. If you want to tackle image optimization seriously for your own projects, we recommend that you take the time to individually test some of our frontrunners to see for yourself just which plugin you prefer.

Have you found different results with any of these image optimization plugins? Let us know and subscribe to the comments section below!

Article thumbnail image by ADE2013, VGstockstudio, Monika Wisniewska / shutterstock.com

93 Comments

  1. Nice post, Tom…really detailed too ???

    Although, I’m surprised to see Imagify not included.

    I have tested it extensively against Ewww & Ewww Cloud, Smush & Smush Pro and Imagify outperforms them all.

    They have a web app and a WordPress plugin and it’s made by the team behind WP Rocket.

    • Exactly. Please make an update and add to compare Imagify.

      • I’ll be honest guys – I hadn’t heard of it. Checking it out now!

    • Definitely agree with Simon and Gustaw ! Make a comparison on the image optmisation plugins without Imagery… Imagify is really different! Have you tested! Thank you for this article. 🙂

  2. Thanks for this blogpost. I’ve been using Compress JPG & PNG Images for a year or so and I’m pretty happy with it. I like the fact that it doesn’t add a lot of features, less is more. The montly limit is 500 and not 100 as you write, but if you compress multiple sizes of an image (and you should) it quickly adds up as each size is a separate compression. For most sites I think this limit is fine for daily operations, but if you have a lot of files on your site that you want to bulk compress it can be tricky. What I ended up doing was compressing some of them each month at the end of the month until it was all done, but seeing now that there are alternatives that don’t have this limit it would have been a lot easier to go with one of them so might try some out in the future.

    • Tom Ewer

      Good stuff, Daniel! Thanks for your comment!

  3. Hi Tom,

    There is a new challenger in the game: Imagify

    It’s 7000+ active installs and 10M optimized images in less 2 months.

    Do you know it? I’m curious to have your thoughts about Imagify.

    • Hey Jonathan,

      See what I said in my post. Imagify is the best out there!

      I’ve been using it since it’s Beta days.

  4. Any test of TinyPNG? They now have a WP plugin as well as PS plugin and more.

  5. I use ‘WP Retina 2x’ for retina ready images. Works well for retina images and I haven’t noticed any performance issues.

    Nice article, Tom!

    Thanks

    • Good suggestion – thanks Kraymer!

  6. I’m currently testing Sirv as well. Made by the same company as Magic Zoom. Looks promising, worth a look.

    • Thanks Jeff, I’ll check it out!

  7. I’m assuming that your test images were optimized before you posted them in this blog. With that being said, your test images are soft. If you had used a photograph of that woman’s face, you would have seen a lack of detail in her eyes. I understand post space limitations, but it would have been beneficial to see at least two before-and-after result images from your test plugins; otherwise, the test numbers are irrelevant if the quality is lost when in real use.

    I have a travel photography website and I struggle to maintain a good balance between smaller image sizes, excellent resolution, and fast site speed. (I’m redesigning my site…I would post a link to it otherwise.) I would never be happy with a 68k image on my site (in fact, they’re nonexistent), unless it was a thumbnail image…and if it’s that small, why bother posting it at all?

    Also, you selected images photographed indoors. Compressing a landscape image down to 68K would most likely result in the sky banding and an image filled with compression artifacts. As much as I would love to throw all of my images into a image compression plugin to free up my time, I would be upset to see that they were compressed equally with no regard to the individual requirements of each image. Perhaps that’s why photographers compress their images in Photoshop (Save for Web), another optimization tool which was omitted from this post.

    • Sharon has some good questions and comments here. I have used Photoshop (save for web) in the past, now I use Lightroom.

      Also I heard the new edition of WordPress coming out has photo optimization. How does this effect the whole issue?

      • I’d be the first to admit the limitations of our testing (as stated in the article). As recommended, if you take image optimization seriously, it’s best that you use our comparisons as a launching pad for your own testing.

        Thank you for your considered comment Sharon!

    • @ Sharon,

      I agree with you 100%! I don’t mess with image compression plugins because they go overboard by introducing artifacts. If someone is running a site that just needs a quick picture over your post that isn’t the focus of your article then go for the plugin. You’re like me in that a photo can be literally worth a million words. I’m also in the travel industry. Wildlife photos are what sells my product. Just the look you get while looking deep into in a baby gray whales eyes is something you can’t leave to a plugin that wacks all the details down.

      My best tool is Photoshop’s (Save for the Web). I can look at four windows at once to see if the compression goes too far in the areas I’m most concerned with. Yes it does take up of our time, but it’s money ahead taking the extra effort.

  8. All I can say is I just tested my page speed before installing EWWW Image Optimizer. I used it to optimize my images and the everything else option.

    Before home page load time – 4.79s
    After home page load time -1.20s

    Those are some beautiful numbers for less than 10 min of effort! Also I optimize all my images before hand in photoshop so Im really happy with the result.

    • Yup – while the more serious image optimizers among us will want to do their own further testing, you can’t go too far wrong by installing one of the recommended plugins and getting on with your day!

  9. Not really a fair test because lossless shouldn’t be put against lossy, they should be in separate tables. Shortpixel is very expensive and has options for lossy and lossless. Shortpixel enables by default lossy which actually reduces image quality. Was horrified when I found this out.

    That is the reason optimus doesn’t use lossy, only lossless. Optimus is unlimited and is 1/3 price of shortpixel tariff. Also shortpixel doesn’t optimize other user roles uploads by default.

    Kraken user review: “A representative of Kraken recently contacted me by email, offering a $5 credit in return for a five-star review. When I suggested that we couldn’t give a positive review while such issues remain unresolved we received no response.”

    Take Kraken off the list right now, not acceptable.

    WPMU is just a massive con, never found a plugin up to scratch from them, many bugs and an aggressive subscription system which could end up costing a big sum of money for a load of rubbish plugins, or even just one. Note you’ll also get regular WPMU banners in your wp-admin area and also left over cron jobs running when you delete their plugins after. CEO should be jailed, they trick you into thinking you get a good deal. So many bugs, if you have a problem and you only bought a single month of updates you won’t be able to access support.

    I’ll never visit WPMU in my lifetime again.

    As for the others, no idea but I suggest looking at the bigger picture before suggesting these plugins. In my opinion, optimus should be right up there because it doesn’t crash like shortpixel and runs for all users. You want optimised images, not reduced quality. Compare lossless quality and do it fairly.

    • I just want to say that I have been a member of WPMU-Dev for 3 years now. Love love love them! And their plugins. And it seems like every time I have a question about WordPress, etc, Google sends me to WPMU-dev and I find the answers I need. I have read some things about them being buggy – in the past – but that’s all gone now.

    • Johnny,
      allow me to comment on your …comments 🙂

      “Shortpixel is very expensive”: are you sure you’ve checked our pricing scheme?
      Because it is among the least expensive ones.

      “Shortpixel enables by default lossy which actually reduces image quality. Was horrified when I found this out.”
      Well, if you’re horrified by “lossy” you can always use “lossless” 🙂
      Or you could just give it a try and see for yourself if you can notice and visual difference.

      “Optimus is unlimited and is 1/3 price of shortpixel tariff”: I’m not sure how you computed this. You could optimize 5K images for $4.99 with ShortPixel.
      The cheapest optimus plan is $19.
      Plus they don’t offer any backup option as far as I remember. This is something I would personally be horrified by 🙂

      “Also shortpixel doesn’t optimize other user roles uploads by default.” – It does now automatically.

      Are there any other reasons why you believe ShortPixel is not worth testing/using?

      • Hi Alex,

        Optimus has a different approach to pricing and is a one-time fee. They charge more if you have images over 5mb. I was regularly going over shortpixel image allowance and paying more. I have many other plugin fees to pay, $60+ per year is too much for what you get. It was attractive at first until I realised how quickly that allowance gets used up. I don’t even run a big blog, it’s not enterprise level and going up a tariff was out of the question.

        The fact is, if you are a first time user of an image optimization plugin, you will not know the difference between lossless and lossy. Therefore it should not be enabled by default regardless of personal opinion. Yes, I could use the backup function but shortpixel would regularly crash/get stuck on 90% of task completion. It would also take so long to optimize everything that I would not bother to backup the images so they could be re-optimized. Not enough time in life, but I did mind that the quality was reduced which is not the way forward in my opinion.

        I’m glad to hear that the user roles problem is now fixed. The backup function is a good idea but many may have heard of vaultpress which takes regular site snapshots. Therefore it would not be a feature that I would be using unless I was very unobservant and did not notice there was a problem e.g. Lots of blog posts written after image issue. For others it may be more important.

  10. So I’m sorry this isn’t related to image optimization, but I just had to say oh my god I don’t know how you guys do it! I’ve never come across a blog where every single post was useful. I’m making my first Divi site and this blog is SO valuable. I wanted to say thank you!

    • Nathan B. Weller

      Thanks Jayne! We’re so glad that you’re getting a lot out of our blog 🙂

      • I agree with Jayne, your blog has terrific information for web designers. I’ve learned a ton since I began reading them about a year ago. Thanks for the great work and I love Divi too!!!

        • Nathan B. Weller

          Thanks! That’s great to hear. If there is anything you’d ever like us to cover feel free to request! We love solving problems for our community 🙂

    • Agreed. As a matter of fact, ET is the only WP newsletter i am still subsribed to since its an all-in-one solution.

      I’ve also tried some other page building solutions, but none of them are as intuitive and, more important, as configurable as DIVI.

      Welcome to the Divi Nation 😉

      • Nathan B. Weller

        Thanks for the kind words Richard! We’re always working on making the Divi Nation a great community to belong to 😀

  11. node, nmp, grunt,gulp optimisation this is way

  12. Er…. Imagify?

    7000+ active installs, 64 reviews and a rating of 4.9 suggest to me that it might be worth a serious looking at. Why did it get left out? I appreciate you can’t review EVERY plugin, but when you’re doing the “best”, surely this is among them, no?

    And while I’m being picky… why choose to test optimizers with images like that? You say you noticed little difference in the quality of some of the results – well you’re hardly going to if you’re using images that are already soft, are you?! What happens when the quality actually matters?

    And would a couple of before and after comparisons have been so much trouble? Not costly on time or bandwidth given that you already optimized them!

    I know this isn’t a technical review site but, as a customer, I have a certain level of trust in the brand. When I see poorly researched articles like this I wonder if I should trust anything I read here or whether it’s all just SEO fodder.

    • Nathan B. Weller

      Based on all of the comments it sounds like Imagify could have easily made the list. Thanks everyone who has mentioned them for making them known to us and the rest of the community!

  13. It should also be noted that with Optimus you can convert to WebP files, which are drastically smaller in file size than JPGs or PNGs.

    • Brian, I can see that Google is touting WebP files, but who uses it? I never heard of it before your mention and read up on it. Facebook used it at one time until it became a huge problem with users. Have they improved it? I just looked at the file types on Photoshop and I don’t see it listed. I read on a Google Developers’ page that you can “convert your favorite collection from PNG and JPEG to WebP by downloading the precompiled cwebp conversion tool for Linux, Windows or Mac OS X” but who is actually doing that? Is it for saving only?

  14. Images stored in a sensible gallery such as Lightroom can be optimised immediately before uploading. Or use Photoshop as suggested by Sharon.

    • Tom Ewer

      Hello Tony! There are lots of different methods in optimising your images – a WordPress plugin solution is, of course, just one. 🙂

  15. It is a pitty you did not include the new kid on the block – Imagefy

    I used EWWW Image Optimizer and WP Smush before, and have recently switched to Imagefy, which is made by the same people as WP Rocket my cache plugin that i use.

    I am most satisfied with the results i get with Imagefy and also for their friendly GUI and affordable plans.

    • Hi Michael,

      As previously mentioned, this plugin is getting a lot of love – thank you for the suggestion!

      Cheers,

      Tom

  16. Excellent Article. Very helpful

  17. TinyPNG does a great job for me. I can use it either on their site for free (max 20 images of 5 mb each at a time) or I can pay for a library full of images. Their rates are reasonable (though I can’t always figure them out lol). Plus, I can do either PNG or JPG files.

    • Tom Ewer

      Thanks Michael! Of course, if you ever needed a plugin solution, then you’d be interested in number five on the list. 😀

  18. Great write up, Tom.

    Image optimization is very crucial for website speed.

    I am using Smush and it is working charm for me.

    Thanks for sharing this.

    • You’re welcome Merry 🙂

  19. What should we consider for retina screens?

      • Image clarity and resolution is even more imperative with retina screens; that’s why they were created. You can easily see the difference in image quality when viewing them at any Apple Store on an iPad or Mac with and without retina screens.

  20. I’m glad for this test. I use Ewww and it works great. Good to know it’s not only my opinion.
    Thanks

    • Tom Ewer

      Thanks, Piotr!

  21. I own the WP Smush Pro as I am a WPMUDEV member if you would like me to run the test images through the Pro version. It performs way better than the free version.
    Dale.

  22. Is there a reason why the Test compares for optimus other images than for the rest? That seems to make it for me not correctly comparable!

  23. Is there a reason why the Test compares for optimus other images than for the rest? That seems to make it for me not correctly comparable!

    • I think it is because that plugin has a 100Kb size limit for its free version. I think the best compression should have been used, that is the pro versions, to see which is the best plugin, not just the best free one.

  24. We like TinyPNG as they also have a WordPress plugin to optimize both JPEG and PNG images.

    Their website can also optimize both PNG and JPEG images and can be saved to DropBox with just a click.

  25. No mention of Imsanity with over 100,000 active installs and a 5 Star rating. Hmmm.

    • Tom Ewer

      There’s always one or two that missed out Gary – thanks for the suggestion!

  26. Do i am the only one to use Prizm Image on my websites 🙂 ?
    I’m really happy withe their service and their compression algorithm and last but not least free account can use up to 1000 compressed images per month :).

    • Tom Ewer

      Prism Image missed out in this post, Pierre, but maybe we could see it included in a future article!

  27. IMHO, image optimization should occur ‘before’ moving images upstream. Granted, hard to do if you’re inheriting that optimization-task after the fact, but a good rule to live by nonetheless.

    After reading this article, as well has having utilized several of those referenced, I did brief test of the my two ‘go-to’ apps for optimizing on my desktop vs. those of the newly lauded Imagify.

    Simple test using simply graduated color bars of red, blue, and green.

    Judge for yourself, but my conclusion is that for clarity and size, I’ll take Squish or jpgMini over imagify’s 3 flavors of compression. (Normal, Agressive & Ultra)

    If by comparison it’s true that Imagify has results that trump the others mentioned in this article, similar tests against those others could be comparable. 😉

    Dropbox link via ‘Michael’ above

    • I tested “Imagify” to test the pictures used in the article. The results are similar to the competition.
      Compression Method “Ultra” is better than the competition, but the quality images differ significantly from the original images.
      The results put on my Dropbox http://bit.ly/imagifytest

      1. JPG
      NORMAL
      Orginal: 530.2kb
      Optimized: 495.4kb
      Percntage: 6.56%

      AGGRESSIVE
      Orginal: 530.2kb
      Optimized: 68.9kb
      Percntage: 87.01%

      ULTRA
      Orginal: 530.2kb
      Optimized: 29.9kb
      Percntage: 94.36%

      2. PNG
      NORMAL
      “This image is already compressed, no further compression required.”

      AGGRESSIVE
      Orginal: 530.2kb
      Optimized: 296.1kb
      Percntage: 64.77%

      ULTRA
      Orginal: 530.2kb
      Optimized: 226.7kb
      Percntage: 73.03%

      • Thank you for posting much-needed before-and-after test images! Well done. Not that you could have done anything otherwise, but the challenge for me remains that a low resolution image was used as a test starting point. When a photographer uses a professional camera, images are in the multi-MB size, not KB size so when I look at these images, I don’t think that any of them are acceptable. I’m not saying that Imagify isn’t a quality product. I adore WP Rocket and its team is the best out there. I can easily assume that Imagify maintains their company’s high standards, as evidenced by the many accolades here. It’s simply that there haven’t been any tests done optimizing a high-resolution (multi-MB size) image down to a KB size. That is where stock images begin; there’s no level of comparison otherwise. I certainly understand the need for low-resolution images on a website, but as a photographer, it’s difficult for me to consider using such a low resolution on my own site. I already feel compromised when using a 500kb image on my site and it pains me to go down to the 200kb range. Another site’s focus is not image-centric which is why 50kb image sizes are deemed satisfactory.

  28. No mention of imagify In my opinion, this is the best image optimisation plugin i’ve seen.

    • Tom Ewer

      Everyone is mentioning Imagify, Darlington! Thank you all for bringing it to our attention!

  29. Thnk’s Kevin for your sharing. I never optimazation my image before. Maybe, it is better to try it. so, my visitors will increase.

    • Tom Ewer

      Thanks, Contoh!

  30. Might be better if you separated the lossy and lossless into separate columns to save confusion. Nice run down though.

  31. It’s worth noting that the WordPress 4.5 release will reduce the default image quality compression from 90% down to 82%. If you’re running lossy compression on top of these images you’ll want to check your settings again to make sure you’re still getting good results 🙂

    • Good point Jesse, thanks!

  32. any thoughts WP Smush vs EWWW Image Optimizer?

    • Tom Ewer

      It’s all going to be a matter of personal preference, or a functional need either one provides. The best thing is to try both and see for yourself!

  33. Great article

    I wonder what you mean by “optimize” though.
    Of course this means compressing files but does any of those plugins convert “regular” jpeg files to progressive?

    • To be honest Xav, that’s not the focus of this particular article 🙂

  34. In had done a similar test few months ago and found that Compress JPEG & PNG images is the best plugin to compress images.

    • Tom Ewer

      We’ve all got our favorites, Janmejai – that’s one of the benefits of plugins!

  35. Great post, I have been using EWWW Image Optimizer. I recommend this to everyone who asks and out right promote it to my photography clients. The images look just as great with much less data to load. After reading this post I am going to check out Optimus to see if it more than EWWW. Thanks again!

    • Tom Ewer

      Thanks, Jaron!

  36. Thanks for the comparison! I’m very interested in the results with test data of eg 4mb and high res. Which one is best then?

  37. Well, this was a basic test as I can see.

    To find bets plugin for image optimization you need to test various image sizes and formats and even test the same image through the particular plugin to see if will get same compression results each time or different.

    And then you would also need to test basic, lossless and lossy type of compression which would also mean having paid version of plugins in most cases.

    I have used and tested all images that have been mentioned in this post.

    For a long time I had used WP Smush but decided to try lossless and lossy compression so now I am using paid plugin not mentioned here.

    In my opinion, it all comes down to features which particular plugin offers and price.

    Because seeing test results on various sites I got the impression that all plugins have same compression results or slight differences.

  38. Hi, I would also add ImageRecycle, it had the PDF compression and really affordable price, optimization reports and more cms integrations. Not sure it’s so popular in WordPress but very popular considering the whole image optimization world 🙂

  39. I love your blog and appreciate your WP image optimization plugins review. I often use TinyPNG on their website. It is not time-consuming if you use lots of images. It is time to switch to a plugin. Thanks for the comparison.

    • Tom Ewer

      You’re welcome Debbie!

  40. Hi I’ve been hunting around trying to find out if ET has started taking advantage of the Responsive Images functionality in WordPress Core.

    https://make.wordpress.org/core/2015/11/10/responsive-images-in-wordpress-4-4/

    I’ve tried and tested many plugins that optimise images and none of them compare to doing it yourself through photoshop. Which I’m happy with, but I also want to take advantage of the picture element’s srcset and sizes attributes.

    Previously this would mean including the RICG plugin and adjusting each picture manually but since it’s been integrated into WP core for a while now I’m wondering if that’s still necessary. Has ET done anything to add this functionality natively into their themes?

    If so, is there information on how it’s implemented somewhere?

    Regards,

    Ryan

  41. Tom, great report – thank you. Neither WPSmush nor Ewww work for me. I have some hi-res full-screen background pngs that are about 3Mb and both these plugs crash and burn into the ground. Too bad, it would be nice to optim on the fly, looks like I should try something on the front-end before upload. 🙂

    • Tom Ewer

      Hello Randy. That certainly sounds like odd behavior, as these plugins work for the majority of people. It may be worth contacting both plugins’ support channels, to see if they can offer some assistance. Good luck!

  42. Hi Tom, your article really helpfully for me as I just started to make my own site last month.

    How about Imsanity plugin? Is it really good plugin too or not?

    • Tom Ewer

      Hello Harry! It’s not one I’ve tried, but there’s nothing stopping you for giving it a whirl! I hope it works out for you – good luck!

    • Harry, allow me to answer your question: Imsanity is OK but if you use ShortPixel image optimization plugin then you won’t need it as it also offers the option to have all the original images resized besides being optimized.

  43. Tom Ewer, Thanks for testing out the plugins before making this post. Too many times I’ve seen posts about tools and plugins without any research being done. It’s just clickbait posts. Keep up the great work! 🙂

    • Tom Ewer

      Thanks! We always endeavor to provide honest posts, and not the clickbait you mention!

  44. Great post, as usual. I just tested ShortPixel Image Optimizer and is so easy to use. Thank you for sharing.

    • Tom Ewer

      No problem, Drake. Glad to have been of service!

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