Best Image Compressor
The best free image compressor: no uploads, no limits, no registration. Compare approaches and shrink JPG, PNG, WebP and AVIF in your browser.
The best compressor is one you can trust with your photos: free, unlimited and private, because every file is processed locally on your device.
How it works
The short answer
The best image compressor is one that shrinks your files without uploading them, without limits, and without asking for an account. The tools here compress JPG, PNG, WebP and AVIF entirely in your browser, so your photos never leave your device.
What makes a compressor great
Look for real size savings, honest quality controls, and privacy. Server based compressors upload your photos, cap file sizes and often count daily limits. A local compressor avoids all of that while producing the same result.
The right format for the job
Compress JPG for photos, PNG for graphics with transparency, and WebP or AVIF for the smallest web files. Each has its own page with the right quality presets, from lossless to balanced to small.
Hit exact size targets
When a form or website demands an image under a certain size, a target size compressor is invaluable. It searches for the highest quality that still fits your limit, removing the guesswork of exporting repeatedly.
Why local beats server based
Because everything runs on your device, there are no uploads, no storage, no daily caps and no account. Your photos stay private and you can compress as many as you like without waiting on a queue.
How much you can save
A JPG photo typically shrinks 30 to 60 percent at balanced quality, and more at lower settings. PNG graphics can halve with a reduced palette, and WebP or AVIF output is smaller still. The right format amplifies the saving.
Frequently asked questions
What is the best free image compressor?
The best one is private and unlimited. The compressors here run in your browser, so nothing is uploaded and there are no limits.
How much can I compress an image?
JPG photos typically shrink 30 to 60 percent at balanced quality, and more at lower quality settings.
Is browser compression as good as a server?
Yes for quality targeted compression. Modern codecs in the browser produce results on par with server side tools.
What is the best format to compress to?
WebP or AVIF for the web, JPG for photos shared anywhere, and PNG for graphics with transparency. Pick by where the file is going.