Free Image Compressor

Compress JPG, PNG and WebP images in your browser, choosing the quality yourself and seeing exactly how many bytes you saved.

Leave a field empty to let it follow the aspect ratio. Images are scaled to fit inside the box you give and are never stretched.

Files you drop here are processed by your own browser. Nothing is uploaded and nothing is stored on our servers — the tools keep working even if you lose your connection after the page has loaded.

How to use Image Compressor

  1. 1Drop your images onto the box above, or click to browse.
  2. 2Choose a quality level. 75 percent is the starting point here, which is a real saving without visible damage on photographs.
  3. 3Optionally cap the width or height, then press apply and download the results.

What this image compressor changes

Two things, and you control both.

The quality setting drives the lossy encoder. Lower it and the codec rounds off more of the fine high-frequency detail in each block of pixels, which is where the bytes go. On photographs this is remarkably hard to see down to about 75 percent, which is why that is the default here rather than the near-lossless 92 the converters use.

The optional width and height cap is the other lever, and often the more effective one. A 4000 pixel photo displayed in a 800 pixel column is carrying five times the pixels it needs. Capping the dimensions removes data that was never going to be visible, which beats compressing detail that at least someone might have seen.

Why PNG behaves differently

PNG is lossless. There is no quality dial that means anything for it, so a compressor that shows you one is showing you a control that does nothing.

Here, a PNG keeps its format and the quality setting is ignored. The way to make a PNG smaller is to reduce its dimensions, which the size fields do. If the image is a photograph rather than a graphic, the better move is converting it to JPG or WebP, and this site has a page for each.

When you compress image files and nothing happens

The size readout after each file exists for this. If it reports a saving of two percent, the file was already compressed, and squeezing it again costs a little quality for almost no bytes.

This is common with images downloaded from the web, exported from a CMS, or sent through a chat app, since all of those compress on the way through. In that situation the honest answer is that there is nothing left to win, and the readout is what tells you so instead of leaving you guessing.

What to keep

Treat compressed files as publishing output, not as working files. Compressing an already compressed file stacks generations of loss, and each round is worse than the last. Keep the camera original or the editor export, and compress from that each time you need a web version.

Local and private

Every file is decoded and re-encoded inside this browser tab. Nothing is uploaded, so there is no size cap imposed from outside and no copy of your photos sitting on someone else's disk.

Frequently asked questions

How much smaller will my images get?
For photographs from a phone or camera, 60 to 85 percent smaller at 75 percent quality is typical. For images that were already compressed once, the saving is much smaller, because most of the removable data is already gone.
Does it keep my file format?
Yes. A JPG stays a JPG and a WebP stays a WebP. PNG is the exception worth knowing about: it is lossless, so quality has no effect on it, and capping the dimensions is the only way to make a PNG smaller here.
Why did one of my files barely shrink?
Almost always because it was already compressed. A JPEG saved at quality 70 has little left to remove at 75, and re-compressing it mostly adds artifacts rather than saving bytes. The size readout tells you when this has happened.
Is the compression lossy?
For JPG and WebP, yes. That is how the size saving is produced. Keep your originals if you might need to edit later, and treat the compressed files as output for publishing.

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