How to compress an image
- Select Choose files or drop your JPG, PNG or WebP images on the box. You can add many at once.
- Pick an output format. Same as input keeps the format; JPG or WebP usually gives the smallest files.
- Move the quality slider. Around 75 to 85 percent looks almost identical to the original for photos.
- Optional: set a maximum width, or a target size in KB. The target mode tries several qualities and keeps the best one that fits.
- Download each file, or all of them as a ZIP.
How image compression works
Photos are stored with a lot of detail your eyes barely notice. Lossy formats such as JPG and WebP drop that detail, and a lower quality setting drops more of it. A phone photo of 4 MB often shrinks to 300 to 800 KB with no visible change. Shrinking the pixel width helps even more: halving the width cuts the pixel count to a quarter.
PNG is different. It is lossless, so it has no quality setting. If you pick PNG as the format, the tool re-saves it and keeps the original when that is already smaller. To make a PNG much smaller, choose WebP as the output. Transparency is kept in WebP.
Tips
- For websites, try WebP at 80 percent with a maximum width of 1600 pixels.
- Need an exact limit for a form? Use compress to 100KB or one of the other size pages.
- Too big for a social post? Resize the image first, then compress.
- Compression re-encodes the image, so location and camera data are removed. You can also use Remove EXIF data to strip details without changing the pixels.
Everything happens on your device. Your images are never uploaded, so you can compress private photos and documents safely.