Compress PNG Images Online
Compress PNG images by up to 90% without uploading a single file. Everything happens in your browser, so your PNGs stay private and there are no size limits.
Unlimited images, No File Size Limits.
Why use CompressImage.io to compress PNG images?
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No Limits
As the compression is happening in the Browser, there are no limits on how many images you can convert or what size of image you can convert.
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100% Private
Since no images are sent to any servers, your images are totally safe and private as no one else can see your images.
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Low Carbon Footprint
Since no servers are involved in the compression process, zero extra electricity is used, hence no carbon emitted.
How to Compress PNG
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Add your PNG files
Drag your PNG images onto the tool or click Select Files. Add one PNG or a few hundred. There is no cap on file count or file size.
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Each PNG compresses right away
Your browser compresses every PNG the moment you drop it in. Nothing gets uploaded, so it stays fast and private.
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Download your compressed PNGs
Save each PNG on its own or grab the whole set as one ZIP. Open Settings first if you want to change quality, resize, or convert to WebP.
How PNG compression works
PNG is a lossless format, so a well compressed PNG looks identical to the one you started with. The file gets smaller because the tool reduces the color palette and strips data the image does not need, not because it throws away visible detail. That is how you can compress a PNG by 50 to 90 percent and still not see the difference.
Most online PNG compressors run on a server. You upload the file, wait in a queue, then run into a cap on size or the number of images. CompressImage.io compresses each PNG inside your browser, so nothing is uploaded and nothing is limited.
Compress PNG files without losing quality
Because PNG keeps every pixel, sharp edges, text, and transparency all come through compression untouched. For the closest match to the original, push the quality slider in Settings toward 100 percent. Logos, icons, and screenshots compress especially well at that setting: a much smaller file with no change you can spot.
When to keep PNG and when to switch formats
Stick with PNG for logos, icons, illustrations, screenshots, and anything that needs a transparent background or crisp text. For photographs, JPEG or WebP almost always give you a smaller file at the same visual quality, since photos gain nothing from lossless storage.
Frequently Asked Questions
How do I compress a PNG without losing quality?
PNG is a lossless format, so the savings come from trimming the color palette and dropping data the image never uses, not from blurring detail. Keep the quality slider near 100% in Settings and the compressed PNG looks the same as the original. Transparency is always kept.
Does compressing a PNG keep transparency?
Yes. The alpha channel survives compression, so transparent and semi-transparent areas stay exactly as they were.
Is there a size limit when I compress PNG files?
No. Compression runs on your own device instead of a server, so you can compress PNGs of any size and as many of them as you want.
Are my PNG files uploaded anywhere?
No. Every PNG is handled locally in your browser with JavaScript and WebAssembly. The files never leave your device, which is why the tool also works offline.
Should I convert my PNG to WebP?
If your site or app supports WebP, and almost every modern browser does, converting can shrink the file further than PNG at the same quality. Turn on Convert to WebP in Settings to compare the two.