How to Compress an Image Without Losing Quality
Large photos slow down websites, fill up inboxes and get rejected by upload forms. Most images can lose 60–80% of their size with no visible difference.
Photos usually shrink by 50–80% at the Recommended level with no visible difference, and PNG screenshots often by 60–80%.
Step by step
- Open Image Compressor and pick an output format — WebP, JPEG, PNG, AVIF, or keep the original.
- Compress by Quality (a percentage) or by Target size (enter KB or MB).
- Open one or more images; each tile shows the size before and after.
- Adjust the settings and press Apply to all if needed, then download.
Which format gives the smallest file?
- WebP and AVIF — the smallest files for websites; supported by all modern browsers.
- JPEG — the safest choice for forms, email and older software.
- PNG — only for graphics with sharp edges or transparency; photos stay large as PNG.
A good default
A quality of 70–80% is visually identical to the original for most photos. Go lower for thumbnails, higher for images you plan to print.
Compressing to an exact size
If a form asks for “under 100 KB”, choose “To a file size” and enter the limit. Each image gets the best quality that still fits.
How PNG compression works
PNGs are reduced to the colours they really need — up to 256 — with smooth dithering, which keeps transparency and makes files much smaller. Tick “PNG: lossless only” if no colour may change.
Frequently asked questions
Can I compress many images at once?
Yes — open several images together and download them individually or all at once.
Should I use WebP or AVIF?
For websites, yes — WebP is usually 25–35% smaller than JPG at the same quality. Keep JPG for files you email or upload to forms.