| Format | Compression | Good for |
|---|---|---|
| JPEG | Lossy | Photos |
| PNG | Lossless | Logos, graphics, transparency |
| WebP | Both | Photos and graphics on the web |
| AVIF | Both | Photos on the web at a very low weight |
Image Compressor
Compression reduces the weight of a file without changing its pixel dimensions. Pages load faster, and photos still look good to the eye.
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We are preparing it. Until then, you will find practical guidance here, and the favicon generator and watermark tool already work.
See all toolsWhy image weight matters
Images are often the heaviest part of a page. Every extra megabyte slows loading, especially on a phone using mobile data, and speed affects both visitors and how a site performs in search.
Lossy and lossless compression
Lossy compression removes detail the eye barely notices and achieves a large reduction. It suits photos. Lossless compression only arranges the data more efficiently: the image stays identical, but the reduction is smaller. It suits graphics, logos and screenshots.
How to compress well
The biggest reduction comes from doing things in the right order:
- First reduce the image to the size it is really shown at.
- Choose a format that fits the content: photo or graphic.
- For photos, start at a quality of about 75–85 and compare the result with the original.
- Keep the original and compress from it, not from an already compressed copy.
When not to compress
Files for print should stay at the highest quality possible. Lossy compression can leave artefacts that are invisible on screen but show on a large printed piece. For print, keep the original file.
Frequently asked questions
How much can an image be reduced?
It depends on the content and the starting file. A photo saved straight from a camera can usually be reduced a lot; an already compressed file, only a little.
Can I compress the same photo several times?
Better not. Each lossy save adds new artefacts, so work from the original.
Which format is best for a website?
For photos, WebP and AVIF usually give smaller files than JPEG. For simple graphics and logos, SVG is often the best choice.
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