Hunting down a great online image optimizer that will fit your needs can feel like a never-ending search. The truth is that there are a lot of options to choose from, and while many of them do have some overlap between them, they’re not all the same – which is why you need a way to compare them. Welcome to the way.
In this post, we’re going to review 11 web-based image optimizers, including key information about each one. We’ll also share some real test data based on a compression experiment we ran using a JPEG and a PNG. Plus we’ll add in what we love about each tool, and what we think it could do better.
Quick picks: Optimole delivered the best JPEG compression result in our test, JPEG Optimizer delivered the best PNG compression result, Online Image Tool stood out for unlimited uploads with no listed file size cap, and Squoosh / Ezgif remain the strongest picks if format conversion flexibility matters most.
Best web-based image optimizer tools of
Below are the results of our image optimization experiments:
Compression Tool
JPEG Image Compression (Original Size ~791 KB)
Percentage Reduction in JPEG File
PNG Image Compression (Original Size ~1.4 MB)
Percentage Reduction in PNG File
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The Optimole image compressor is our own free online tool that you can use to compress JPEG, PNG, and WebP image files. It’s easy to use and offers extremely fast results. You can process up to five images at a time, with each image being no larger than 5 MB.
Once you receive the results, you’ll also be able to compare the original version of the image with the compressed version. The tool gives you a back and forth slider for this purpose:
In addition, you’ll notice that there’s an option to toggle between high, medium, and low compression. This is useful in case you find that the highest level dulls the original image down too much, in which case you can go for the medium or low options.
In the meantime, the compression results from the test are below:
Results 📉
- JPEG Image file saving: 94.77%This result was obtained by choosing the high level, but even at the medium level, the result still came in only about 1% less.
- PNG Image file saving: 74.78%This result remained the same, regardless of choosing low, medium, or high.
Key information 🗝️
- How many images at once: 5
- Max file size of each image: 5 MB
- Input accepted: JPEG, PNG, WebP
- Output choices: Image outputs are provided in the same file type as the input format
Note: The supported format list above refers specifically to the online compressor tested here. Optimole’s broader Best Image Online Optimizer Tools
JPEG Image Compression (Original Size ~791 KB)
Percentage Reduction in JPEG File
PNG Image Compression (Original Size ~1.4 MB)
Percentage Reduction in PNG File
