Compresser des images

Compress Images: smaller photos, same dimensions, faster everything

Phone cameras produce beautiful, enormous photos — and enormous photos are a problem everywhere else. They slow down websites, chew through mobile data, exceed marketplace upload limits, and turn a quick message into a long wait. Compress Images shrinks JPG, PNG, and WEBP files in batches, using a quality slider to control how much size you trade for fidelity, while leaving each image's dimensions untouched.

That last point matters: compression here reduces file weight, not pixel size. A 4000-pixel-wide photo stays 4000 pixels wide, so it still prints and displays at full resolution — it just takes up far less storage. The catch is format. JPG and WEBP respond well to quality compression; PNG barely shrinks at all, because its lossless format is built to preserve every pixel exactly. If a PNG refuses to get smaller, convert it to JPG first (unless you need transparency) and then compress — that two-step move is often the difference between a 5 MB file and a 500 KB one.

How to compress images

1. Open Compresser des images and add your photos — you can process a whole batch at once.
2. Set the quality slider: high values (around 85–90) for photos you will print or publish, lower values (around 70) for web use and messaging, where the difference is invisible on screen.
3. Run the batch and compare a couple of results at full size before accepting them — check faces, text, and fine detail.
4. Download the compressed set. Keep your originals as masters; compressed copies are for sharing, not archiving.

When to use it — and when not to

Use it before uploading to a website, sending photos by email or chat, or freeing space on a device. Don't use it on images you plan to edit heavily afterwards — every compression discards some detail, and repeated edits on a compressed file degrade it further. Also don't expect miracles from PNG files with transparency, or from images that are already heavily compressed; both have little left to give.

Frequently asked questions

Why did my PNG barely shrink?

PNG uses lossless compression, so the quality slider has almost nothing to work with. Convert the image to JPG first if you don't need transparency, then compress — the size drop is usually dramatic.

Will compression change my image dimensions?

No. Width and height stay exactly the same; only the file size drops. If you also need smaller dimensions, resize the image separately before or after compressing.

Can I compress HEIC photos from my iPhone?

Not directly — convert HEIC to JPG first, then compress the JPG. Browsers handle JPG universally, so this also makes the photo shareable with everyone.

Do my photos leave my device?

No. Compression runs entirely in your browser, on your own hardware. Your photos are never uploaded.

See the Compress Images guide. Related tools: JPG ⇄ PNG, HEIC vers JPG/PNG, Images vers PDF.