Is this image converter free? Are my images uploaded?

Yes, free with no sign-up, and your images are never uploaded. Decoding and re-encoding happen in your browser tab with the Canvas API; closing the tab leaves nothing behind.

Which formats can I convert, and why not HEIC or AVIF output?

Output is PNG, JPG or WebP — the formats browsers can reliably encode with Canvas. Input is whatever this browser can decode, normally JPG, PNG, WebP, GIF, BMP and SVG stills. HEIC/HEIF photos from iPhones usually cannot be decoded in browsers, so export them as JPG first; AVIF decoding varies by browser and AVIF encoding is not reliably available, so neither is promised.

What happens to transparency when I convert to JPG?

JPG has no transparency, so transparent pixels must be painted over a background. This converter warns you and lets you choose that background — white by default, black, or any custom colour — before anything is flattened. To keep transparency, convert to PNG or WebP instead, and always keep your transparent original.

Does converting JPG to PNG improve quality? Does converting change dimensions?

No to both. Converting never changes width or height, and JPG to PNG cannot restore detail JPG already discarded — it only makes a larger file that looks the same. JPG or WebP at lower quality does trade sharpness for a smaller file, so convert from your original, keep the original, and compare the Before/After sizes shown for every file.

What is the difference between Converter, Resizer and Compressor?

The Converter changes the file format at the same dimensions. The Image Resizer changes pixel dimensions and crop. The Image Compressor keeps dimensions and only re-encodes so the file weighs less. Convert when the format is wrong, resize when the dimensions are wrong, compress when only the file is too heavy.

Can I convert many images at once?

Yes. Add a batch to the queue, choose one output format and quality, convert all, then download per file or use Download All, which saves each converted file one by one. Animated GIF or WebP converts as a still first frame, and camera EXIF metadata is not carried into the converted file.

Convertisseur d'Images — JPG en PNG, PNG en JPG, WebP Gratuit

Convertisseur d'images gratuit. Convertissez JPG, PNG et WebP aux mêmes dimensions, par lots, avec qualité et fond JPG. 100 % local, aucun envoi ; HEIC illisible dans les navigateurs en général.