Image Converter

How it works

Pick (or drop) one or more files. The tool reads them with FileReader, draws each one into an off-screen <canvas>, and uses canvas.toBlob(mime, quality) to produce the converted output. Three quality presets map to 0.95 / 0.85 / 0.65. The resize input scales both dimensions before the canvas is drawn.

Supported inputs: JPG, PNG, WebP, GIF, BMP, AVIF, HEIC, HEIF, SVG, and camera RAW (DNG, CR2, CR3, NEF, ARW, RAF, ORF, RW2). Animated GIFs are flattened to the first frame (canvas can't preserve animation). SVGs are rasterized at their intrinsic size before conversion.

Supported outputs: WebP (default), AVIF, JPG, PNG.

HEIC and HEIF need a decoder that browsers other than Safari don't ship. To keep the page light, heic2any is only loaded on demand: the first time you drop a .heic file, it is fetched via dynamic import(). If you never use HEIC, the library never loads.

RAW files follow the same on-demand pattern. Dropping a .dng or any other RAW file loads libraw-wasm, a WebAssembly build of LibRaw (about 1.4 MB). It demosaics the sensor data in a Web Worker with the camera's recorded white balance, so the page stays responsive while a 40-megapixel file decodes. Expect a few seconds per file.

When to use it

• Shrinking photos before posting them somewhere with a strict size limit.
• Turning an iPhone HEIC into a WebP or JPG that every browser can show.
• Getting a shareable JPG out of a drone or camera DNG without opening Lightroom.
• Quickly batch-converting a folder of PNGs to WebP without uploading them anywhere.

Everything runs locally in your browser. Nothing leaves the page.