Bū tools
Image converter
JPG, PNG, WebP, AVIF, resize, lighter files.
What it does
Converts images from one format to another, right on your device: JPG, PNG, WebP, and AVIF when your browser can write it. It can also resize them and make them lighter.
How
- Open one or more images (JPG, PNG, WebP, GIF, AVIF, HEIC on Safari…). Go from one to the next with ‹ ›.
- Choose the format and the quality (JPG, WebP and AVIF; PNG is lossless). The line under the preview shows the real file size.
- Size: a percentage (100 % is the original, 75, 50, 25 %), or a long side in px: 3840 (4K), 2560 (1440p), 1920 (Full HD, the usual full width on the web), 1280 (HD), 1080 (Instagram) (greyed when it wouldn’t make the image smaller: an image is never enlarged). In the preview, the dotted frame is the original size.
- Background: JPG has no transparency; transparent areas become white or black.
- Download the current image, or all of them in a .zip.
Good to know
WebP and AVIF are much lighter than JPG at the same quality, and read by all recent browsers; JPG remains the safest everywhere. PNG is for graphics, logos and transparency.
The image is redrawn, so its metadata (EXIF, GPS location, camera) is not kept: handy before posting a photo. Color profiles are converted to sRGB.
Free, no account, nothing is sent: it runs in your browser, even offline.
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