CompressPicture — software this site ships, and its licences
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Everything below runs in your browser. Nothing is installed and no file you open is sent anywhere.
Each codec is a separate file under /codecs/ (or a separate script chunk), loaded only when a job
needs it. Licence texts for the codecs are in /codecs/ beside them.

Encoders (WebAssembly, in the image worker; wrappers from jSquash, Apache-2.0,
https://github.com/jamsinclair/jSquash — /codecs/LICENSE-jsquash-apache-2.0.txt)

  MozJPEG / libjpeg-turbo   IJG licence, BSD-3-Clause, zlib    /codecs/mozjpeg_enc.*   /codecs/LICENSE-mozjpeg.md
  libwebp                   BSD-3-Clause                        /codecs/webp_enc.*      /codecs/LICENSE-libwebp.md
  libavif + libaom          BSD-2-Clause (+ AOMedia patent licence)  /codecs/avif_enc.*  /codecs/LICENSE-libavif.md
  OxiPNG                    MIT                                 /codecs/squoosh_oxipng* /codecs/LICENSE-oxipng.md

HEIC decoder

  libheif (libheif-js 1.23.2)   LGPL-3.0
    https://github.com/catdad-experiments/libheif-js  ·  https://github.com/strukturag/libheif
    Used unmodified, as a separate script chunk that is fetched only when a HEIC file is opened in a
    browser that cannot decode HEIC itself. It can be replaced with any compatible build of the same
    library. The complete corresponding source is at the links above; on request through the contact
    page we will also provide it directly. LGPL-3.0 text: https://www.gnu.org/licenses/lgpl-3.0.txt

In-page code

  upng-js        MIT    PNG encoder and palette quantiser
  pako           MIT and zlib    deflate, used by upng-js
  React, Next.js MIT
  clsx           MIT
  DM Sans, DM Serif Display (Fontsource)   SIL Open Font License 1.1

Written for this site (no third-party code): the GIF decoder and encoder, the PDF writer, the
document flattener, the JPEG Huffman optimiser, the ZIP writer and the metadata tools.