Image Format Converter - Free Online Image Converter (PNG, J
Convert images between PNG, JPEG, WebP, and AVIF with adjustable quality or compression — before/after sizes side by side, so you know exactly what you're getting. Everything runs in your browser; your images never leave your device. This free online image converter re-encodes files locally with the HTML Canvas API, so there is no upload and no server.
How to Use
1. Upload or drag & drop one or more images (any source format).
2. Pick the target format — PNG, JPEG, WebP, or AVIF.
3. Dial the quality (for JPEG, WebP, AVIF) — PNG is lossless, so the slider does not apply.
4. Convert — all selected files render side-by-side with the new byte size.
5. Download the result (saved as
Example
Load a 3.8 MB PNG screenshot, pick JPEG, and set quality to 85%. The tool re-encodes it in your browser and reports ~75% smaller — the sharpness is visually identical for web use. Switch the target to WebP and the same file gets a comparable reduction with better perceptual quality. Hit Download and screenshot.jpg (or .webp) is saved. Nothing was uploaded anywhere; the whole conversion happened on your machine.
Also check out the live tool at freeq.one/tools/image-converter — part of the FreeQ.One suite of free online tools.