The Image Compressor
that stays local.
Compress JPG, PNG, WebP and AVIF images online, for free, without uploading them anywhere.
Glissez vos images ici
PNG, JPG, WebP, AVIF · 5MB max par lot
BEST IMG Optimizer aussi en plugin WordPress
Optimisez directement les images de votre médiathèque WordPress, sans changer d'onglet. Compression 100% locale sur votre propre serveur (aucune image envoyée à l'extérieur) — le même principe que l'outil en ligne.
One compressor, every common image format
Most online image compressors only handle one format, watermark your files, or upload your photos to a remote server. best-img.com does none of that: it compresses JPG, PNG, WebP and AVIF images directly in your browser using modern web technology, with no watermark and no image ever leaving your device.
How it works
Drop any image
PNG, JPG, WebP or AVIF — drag and drop one or several files into the drop zone.
Pick format and quality
Keep the original format or convert to WebP, AVIF, JPEG or PNG, and adjust the compression level.
Download the result
Get your compressed images individually or all at once.
Why choose a local image compressor
- Total privacy: nothing is ever uploaded to a server — compression happens on your device.
- No watermark, ever, on the free or Premium plan.
- Works with PNG, JPG, WebP and AVIF, in and out.
- Instant processing, no upload queue.
- No sign-up required for the free tier (20 images/day).
Frequently asked questions
Which image formats does this compressor support?
Input: PNG, JPG, WebP and AVIF. Output: you can convert to WebP, AVIF, JPEG, PNG, or keep the original format.
Is my data really not uploaded anywhere?
Correct — all compression happens locally in your browser using the Canvas API. Nothing is sent to any server.
Which format should I use for my website?
WebP is a great modern default: smaller than JPG/PNG at equivalent quality, and supported by all current browsers. AVIF compresses even further but encoding is slower.
Is there a daily limit?
The free plan allows 20 images per day. The Premium plan removes that limit entirely.
Can I use this for e-commerce or blog photos?
Yes — it's commonly used to optimize product photos, blog images, and any visual content before publishing.