libwebp-1.6.0
- 6/30/2025 version 1.6.0
  This is a binary compatible release.
  API changes:
    - libwebp: WebPValidateDecoderConfig
  * additional x86 (AVX2, SSE2), general optimizations and compression
    improvements for lossless
  * `-mt` returns same results as single-threaded lossless (regressed in
    1.5.0, #426506716)
  * miscellaneous warning, bug & build fixes (#393104377, #397130631,
    #398288323, #398066379, #427503509)
  Tool updates:
    * cwebp can restrict the use of `-resize` with `-resize_mode` (#405437935)

libwebp-1.6.0-rc1

libwebp-1.5.0
- 12/19/2024 version 1.5.0
  This is a binary compatible release.
  API changes:
    - `cross_color_transform_bits` added to WebPAuxStats
  * minor lossless encoder speed and compression improvements
  * lossless encoding does not use floats anymore
  * additional Arm optimizations for lossy & lossless + general code generation
    improvements
  * improvements to WASM performance (#643)
  * improvements and corrections in webp-container-spec.txt and
    webp-lossless-bitstream-spec.txt (#646, #355607636)
  * further security related hardening and increased fuzzing coverage w/fuzztest
    (oss-fuzz: #382816119, #70112, #70102, #69873, #69825, #69508, #69208)
  * miscellaneous warning, bug & build fixes (#499, #562, #381372617,
    #381109771, #42340561, #375011696, #372109644, chromium: #334120888)
  Tool updates:
    * gif2webp: add -sharp_yuv & -near_lossless
    * img2webp: add -exact & -noexact
    * exit codes normalized; running an example program with no
      arguments will output its help and exit with an error (#42340557,
      #381372617)

libwebp-1.5.0-rc1

RFC 9649 WebP Image Format
doc/webp-container-spec.txt and doc/webp-lossless-bitstream-spec.txt are
the basis for contents of the RFC.

libwebp-1.4.0
- 4/12/2024: version 1.4.0
  This is a binary compatible release.
  * API changes:
    - libwebpmux: WebPAnimEncoderSetChunk, WebPAnimEncoderGetChunk,
                  WebPAnimEncoderDeleteChunk
    - libsharpyuv: SharpYuvOptionsInit, SharpYuvConvertWithOptions
    - extras: SharpYuvEstimate420Risk
  * further security related hardening in libwebp & examples
  * some minor optimizations in the lossless encoder
  * added WEBP_NODISCARD to report unused result warnings; enable with
    -DWEBP_ENABLE_NODISCARD=1
  * improvements and corrections in webp-container-spec.txt and
    webp-lossless-bitstream-spec.txt (#611)
  * miscellaneous warning, bug & build fixes (#615, #619, #632, #635)

libwebp-1.4.0-rc1

libwebp-1.3.2
- 9/13/2023: version 1.3.2
  This is a binary compatible release.
  * security fix for lossless decoder (chromium: #1479274, CVE-2023-4863)

libwebp-1.3.1
- 6/23/2023: version 1.3.1
  This is a binary compatible release.
  * security fixes for lossless encoder (#603, chromium: #1420107, #1455619,
    CVE-2023-1999)
  * improve error reporting through WebPPicture error codes
  * fix upsampling for RGB565 and RGBA4444 in NEON builds
  * img2webp: add -sharp_yuv & -near_lossless
  * Windows builds:
    - fix compatibility with clang-cl (#607)
    - improve Arm64 performance with cl.exe
    - add Arm64EC support
  * fix webp_js with emcc >= 3.1.27 (stack size change, #614)
  * CMake fixes (#592, #610, #612)
  * further updates to the container and lossless bitstream docs (#581, #611)

libwebp-1.3.1-rc2