Licences

convrtr runs every conversion locally using the open-source engines below. This list is generated from each engine's own installed package.json — version and licence read live, not typed by hand — and, for the engines that ship WebAssembly, a scan of the files each one actually installs. A version bump cannot make this page stale.

• @breezystack/lamejs 1.2.7 — LGPL-3.0

• @ffmpeg/core 0.12.10 — GPL-2.0-or-later — wraps FFmpeg

  dist/esm/ffmpeg-core.wasm, dist/umd/ffmpeg-core.wasm

• @ffmpeg/ffmpeg 0.12.15 — MIT

• @jsquash/avif 2.1.1 — Apache-2.0 — wraps libavif

  codec/dec/avif_dec.wasm, codec/enc/avif_enc.wasm, codec/enc/avif_enc_mt.wasm

• @jsquash/jpeg 1.6.0 — Apache-2.0 — wraps MozJPEG

  codec/dec/mozjpeg_dec.wasm, codec/enc/mozjpeg_enc.wasm

• @jsquash/jxl 1.3.0 — Apache-2.0 — wraps libjxl

  codec/dec/jxl_dec.wasm, codec/enc/jxl_enc.wasm, codec/enc/jxl_enc_mt.wasm, codec/enc/jxl_enc_mt_simd.wasm

• @jsquash/oxipng 2.3.0 — Apache-2.0 — wraps Oxipng

  codec/pkg/squoosh_oxipng_bg.wasm, codec/pkg-parallel/squoosh_oxipng_bg.wasm

• @jsquash/png 3.1.1 — Apache-2.0 — wraps the Rust `png` crate

  codec/pkg/squoosh_png_bg.wasm

• @jsquash/resize 2.1.1 — Apache-2.0 — wraps resize, wasmboy-rs's hqx port, and magic-kernel-rust

  lib/hqx/pkg/squooshhqx_bg.wasm, lib/magic-kernel/pkg/jsquash_magic_kernel_bg.wasm, lib/resize/pkg/squoosh_resize_bg.wasm

• @jsquash/webp 1.5.0 — Apache-2.0 — wraps libwebp

  codec/dec/webp_dec.wasm, codec/enc/webp_enc.wasm, codec/enc/webp_enc_simd.wasm

• fflate 0.8.3 — MIT

• gifenc 1.0.3 — MIT

• libflacjs 5.6.0 — MIT — wraps libFLAC (Xiph.Org)

  dist/libflac.dev.wasm.wasm, dist/libflac.min.wasm.wasm, dist/libflac.wasm.wasm

• libheif-js 1.19.8 — LGPL-3.0 — wraps libheif

  libheif-wasm/libheif.wasm

• mediabunny 1.55.5 — MPL-2.0

• pdf-lib 1.17.1 — MIT

• svgo 4.1.0 — MIT