Features
Format converter
Convert between PNG, WebP, AVIF, JPEG, BMP, and TIFF — batch-drop multiple files, no upload, no quality loss when going lossless-to-lossless.
What it does
The Format Converter changes a file's encoding without changing its dimensions. Drop one or more files, pick a target format, and download the re-encoded copies.
Supported formats:
- PNG — lossless, alpha. Universal compatibility, larger file size.
- WebP — lossy or lossless, alpha. Modern default. Smaller than PNG, supported everywhere.
- AVIF — lossy or lossless, alpha + HDR. Smallest output but slowest to encode.
- JPEG — lossy, no alpha. Smallest universal-compatibility option.
- BMP — uncompressed. Useful for downstream tools that reject everything else (some Windows utilities, certain CNC software).
- TIFF — high-bit-depth, multi-page. Common in print workflows.
When format conversion matters
Most modern tools accept any of the above, so conversion is usually about:
- Hitting an upload requirement that names a specific extension.
- Migrating older PNG-only artwork into WebP to shrink page weight on a site.
- Producing JPEG copies of transparent PNGs for email signatures or other "no transparency" destinations.
- Standardizing a folder before passing to a tool that mishandles mixed formats.
Quality settings (for lossy targets)
When converting to a lossy format (WebP, AVIF, JPEG), you can choose:
- High (90–95) — visually identical to the source for nearly all photographs.
- Balanced (75–85) — meaningful size savings, fine for most web use.
- Maximum compression (60) — only when file size beats fidelity.
When converting between two lossless formats (PNG↔WebP-lossless), pixel data is preserved bit-for-bit. No quality is lost.
Alpha channel handling
- PNG → WebP / AVIF / TIFF — alpha preserved.
- PNG → JPEG / BMP — alpha is flattened against the matte colour you pick (white by default).
- JPEG → anything — there is no alpha to recover; output is fully opaque.
Batch conversion
Drop multiple files at once. Each is converted independently and added to the download list. There is no server upload — every file is encoded locally and never leaves your device.
Privacy
The encoder uses the browser's built-in image pipeline (WebCodecs / OffscreenCanvas) plus a WASM AVIF encoder. None of your files are uploaded.