Image Compressor
Shrink JPG, PNG and WEBP files while keeping them sharp.
Free image compressor: reduce image size for JPG, PNG and WEBP files and keep them sharp, in bulk. No watermark, and nothing is uploaded.
What Image Compressor is for
For when a file is simply too big: an upload form that refuses it, a page that loads slowly, an email that bounces. It re-encodes at a quality you choose and can cap the dimensions at the same time, which usually matters more than the quality setting does.
What quality number to use
Around 80 is the sweet spot for photographs. Above 90 the file grows quickly for detail almost no one can see; below 60, edges and skies start to show blocks. For images going on a website, 70 to 75 is common and usually invisible.
Change the format, not just the quality
A screenshot or photo saved as PNG is often ten times the size of the same picture as JPG or WEBP. Switching format is usually a bigger saving than any quality setting. WEBP is smallest for the web; JPG is safest for email and forms.
If the image has transparency, stay with PNG or WEBP. JPG fills transparent areas with a colour.
Hitting an exact size limit
Forms that demand "under 100 KB" or "under 20 KB" are easier with the size presets, which try quality and dimensions until the file fits. For a whole folder at one quality, this page is faster.
Resizing helps more than you think
A 4000-pixel photo shown 1200 pixels wide is carrying over ten times the pixels it needs. Setting a maximum width here, or with Resize Image, cuts the file more than any quality setting would.
How to use it
- Add your files. Drop them on the page or choose them. They stay on your device.
- Set the output format and quality. The defaults suit most files.
- Press convert and save the results, individually or as one ZIP.
Questions
How much smaller will the file get?
A photograph typically drops by 60 to 90 per cent moving to WEBP at quality 75, with no difference most people can see. A screenshot may not shrink at all, because it is already efficiently stored.
Why did my PNG get bigger?
Because it was already small and well compressed. Re-encoding an efficient file cannot improve it. When that happens the original is handed back untouched rather than a larger copy.
What quality should I use?
Around 75 to 80 is the sweet spot for photographs: above it the file grows quickly for a difference almost nobody can see, below it the artefacts start to show in smooth areas like skies and skin.
Is resizing better than compressing?
Usually, yes. A 12-megapixel photo shown at 800 pixels wide is carrying fifteen times more detail than the screen will ever draw. Capping the longest side is the single biggest saving available.