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.
Related
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