Licenses

The production install is checked for GPL and AGPL dependencies. LGPL is allowed only as a separate file, which is how libheif is served. The build fails if a dependency is GPL or AGPL with no permissive alternative.

Swap the HEIC decoder

1. Build a single-threaded libheif wasm without x264 or x265. SharedArrayBuffer is not required.
2. Replace /wasm/libheif/libheif.wasm. Replace libheif.js only if the glue must match.
3. Keep the file names. The worker loads them from that path and does not bundle them.
4. License texts are in that folder. Upstream source is linked below. Package version: 1.23.5.

Libraries inside the wasm

• libheif · LGPL-3.0

  Shipped unmodified as /wasm/libheif/libheif.wasm and libheif.js from libheif-js. Replace those filenames to swap the build.

  https://github.com/strukturag/libheif

• libde265 · LGPL-3.0

  HEVC decoder linked inside the libheif wasm. Not a separate download.

  https://github.com/strukturag/libde265

• dav1d · BSD-2-Clause

  AV1 decoder linked inside the same wasm. This site’s pages do not convert AVIF yet.

  https://code.videolan.org/videolan/dav1d

npm packages

• exifr 7.1.3 · MIT · source
• fflate 0.8.3 · MIT · source
• libheif-js 1.23.5 · LGPL-3.0 · source
• piexifjs 1.0.6 · MIT · source
• preact 10.29.8 · MIT · source
• preact-render-to-string 6.8.1 · MIT · source