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Compress an image
Make a photograph or a graphic smaller without sending it anywhere. Every format below is compressed by your own browser, so the file never leaves your device — and if it cannot be made meaningfully smaller, you get the original back rather than a file that grew.
Up to 100 files at once. Mixed formats are fine.
They convert one after another and download together as a ZIP.
Compress by format
- JPGCompress JPGThe universal photo format. Small files, no transparency, quality drops each time it is saved.
- PNGCompress PNGLossless raster format with transparency. The safe choice for screenshots, logos and line art.
- WebPCompress WebPGoogle format for the web. Roughly 30% smaller than JPG at the same quality, with transparency.
- AVIFCompress AVIFThe most efficient web image format today. Smaller than WebP, slower to encode.
- JXLCompress JPEG XLThe JPEG successor. Can repack existing JPGs 20% smaller without touching image quality.
Compress to a specific size
An upload form with a hard limit is the usual reason to want this. These pages encode at several qualities and keep the highest one that fits underneath — and say so plainly when the number cannot be reached without wrecking the picture.
What compressing can and cannot do
For a photograph, most of the size is detail your eye was never resolving, and discarding it is close to free — half to four fifths of a JPEG usually goes without anything becoming visible. For a logo, a screenshot or a diagram stored as PNG, nothing is discarded at all: the file is re-encoded losslessly, and the saving is whatever a better encoder can find, typically ten to thirty per cent.
What no compressor can do is rescue a photograph stored in the wrong format. A PNG photograph is often ten times the size of the same picture as a JPEG or a WebP, and no amount of lossless optimisation closes that gap — converting does, in one step. The compression pages say so where it applies rather than selling you the tool you happen to be standing in front of.
The other thing worth knowing: reducing the dimensions almost always saves more than reducing the quality. A photograph 4000 pixels wide that will be looked at in a 800-pixel column is carrying four fifths of its bytes for nothing, and every page here offers a resize control alongside the quality one for that reason.