Why is there no PNG option?

PNG is a lossless format - the only way to compress it is to reduce the colour palette (8-bit PNG) or convert to a lossy format. We don't try to fake compression by re-encoding PNG; instead, send the file through image-converter (PNG → WebP or JPG) and then compress from there.

What quality is 'safe'?

75-85% is the standard 'visually lossless' band for photos. Below 70% you start to see blocky compression artefacts on smooth gradients (sky, skin). Above 90% the file barely shrinks. For UI screenshots, stay above 90% or use a lossless format instead.

Will it strip EXIF metadata?

Yes. Canvas re-encodes from raw pixels, so EXIF (camera, GPS, timestamps), the original ICC colour profile, and any embedded thumbnails are stripped. That's usually what you want when publishing to the web; if you need EXIF preserved, use a dedicated photo tool.

Compresseur d'image

Réduit la taille de JPG et WebP avec un curseur de qualité et un aperçu avant/après en direct.

Fonctionne dans votre navigateur

Déposez un JPG ou WebP, glissez le curseur de qualité, et voyez la taille du fichier chuter. Un aperçu côte-à-côte montre le coût visuel de la compression. Tout reste dans votre navigateur. Pas de PNG ici - il est sans perte ; convertissez-le d'abord vers WebP ou JPG via le convertisseur d'image.

Déposez un JPG ou WebP ici ou cliquez pour en choisir

JPG ou WebP - le PNG ne se compresse pas (utilisez d'abord le convertisseur)

Comment l'utiliser

Drop a JPG or WebP
Drag and drop or click to pick. PNGs are not supported here - convert first via image-converter.
Drag the quality slider
Watch the file-size readout drop and the side-by-side preview change. 75-85 is the usual sweet spot.
Download the compressed copy
Filename gets `-compressed` appended. The original is untouched.

Qu'est-ce que c'est ?

An image compressor reduces the file size of a JPG or WebP image by re-encoding the pixels at lower quality. The browser's Canvas API handles the re-encoding; you set the quality on a 0-100 scale and the encoder discards visual detail proportionally. The result is a smaller file that looks almost identical at typical viewing sizes - the workhorse trick behind every fast-loading website.

Quand l'utiliser

Preparing photos for a website before they slow down Core Web Vitals. Shrinking an iPhone photo from 5 MB to 200 KB before emailing it. Compressing user uploads on the way to a storage bucket where bandwidth costs add up. Anywhere file size matters and a 5-10 % visual quality drop is invisible at the viewing size.

Erreurs courantes

Compressing the same image multiple times - lossy formats lose a little quality each round (generational loss); always compress from the original. Picking 100 % quality and being disappointed by tiny savings - the sweet spot is 75-85 %. And compressing a UI screenshot to a lossy format - the compression banding around sharp edges makes the screenshot look broken.

FAQ

Why is there no PNG option?: PNG is a lossless format - the only way to compress it is to reduce the colour palette (8-bit PNG) or convert to a lossy format. We don't try to fake compression by re-encoding PNG; instead, send the file through image-converter (PNG → WebP or JPG) and then compress from there.
What quality is 'safe'?: 75-85% is the standard 'visually lossless' band for photos. Below 70% you start to see blocky compression artefacts on smooth gradients (sky, skin). Above 90% the file barely shrinks. For UI screenshots, stay above 90% or use a lossless format instead.
Will it strip EXIF metadata?: Yes. Canvas re-encodes from raw pixels, so EXIF (camera, GPS, timestamps), the original ICC colour profile, and any embedded thumbnails are stripped. That's usually what you want when publishing to the web; if you need EXIF preserved, use a dedicated photo tool.

Convertisseur d'image

Convertit PNG, JPG, WebP et AVIF dans votre navigateur - sans upload, sans inscription.

Redimensionneur d'image

Redimensionnez des images en pixels ou en pourcentage dans votre navigateur - sans upload.

Image en Base64

Convertit une image en Data URI (base64) avec extraits CSS et HTML prêts à coller - ou colle un Data URI pour prévisualiser.