WebP Lossless

Writable

image

WebP is a raster image format developed by Google that uses the Resource Interchange File Format as a container. WebP’s lossless compression uses advanced techniques such as dedicated entropy codes for different color channels, exploiting 2D locality of backward reference distances and a color cache of recently used colors. This complements basic techniques such as dictionary coding, Huffman coding and color indexing transform.

Identify it

Extensions	`.webp`
MIME types	`image/webp`
Signatures	`52494646` at byte 0 (WebP Lossless)
PRONOM	`fmt/567`
Wikidata	`Q683670`

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Open it

AndroidOpen sourcereads and writes · Apache Software License 2.0 / GNU General Public License, version 2.0
GIMPOpen sourcereads and writes · GNU General Public License, version 3.0
KritaOpen sourcereads and writes · GNU General Public License, version 3.0
libexiv2Open sourcereads and writes · GNU General Public License, version 2.0 or later
GD Graphics LibraryOpen sourcewrites · BSD licenses
Q108353872Open sourcereads and writes · GNU General Public License, version 3.0
Q141647655Open sourcereads and writes · Apache Software License 2.0 / MIT License
Q141647660Open sourcereads and writes · Apache Software License 2.0 / MIT License
Q141647662Open sourcewrites · Apache Software License 2.0 / MIT License
Apache TikaOpen sourcereads · Apache Software License 2.0
ExifToolOpen sourcereads · Artistic License / GNU General Public License, version 1.0 or later
nomacsOpen sourcereads · GNU General Public License, version 3.0
OpenImageIOOpen sourcereads · BSD licenses
Q1047199Open sourcereads · ImageMagick License
AbydosOpen sourcereads · GNU Lesser General Public License
ConverseenOpen sourcereads · GNU General Public License, version 3.0
GodotOpen sourcereads · MIT License
imageioOpen sourcereads · 2-clause BSD License
MapLibre GL JSOpen sourcereads · 3-clause BSD License
Mozilla FirefoxOpen sourcereads · Mozilla Public License, version 2.0
PhotoRecOpen sourcereads · GNU General Public License
PixiEditorOpen sourcereads · GNU Lesser General Public License, version 3.0
Q130252332Open sourcereads · Apache Software License 2.0 / Creative Commons Attribution 4.0 International / MIT License
TesseractOpen sourcereads · Apache Software License 2.0
ThorVGOpen sourcereads · MIT License
ZenphotoOpen sourcereads · GNU General Public License, version 2.0
ACDSeereads and writes · proprietary license
Cloudflare Polishwrites
Q650922writes · freeware / proprietary license
Adobe Photoshop Elementsreads and writes
Asepritewrites · proprietary license
Clip Studio Paintwrites · proprietary license
PaintShop Pro X4reads and writes
Photopeareads and writes
PicPickreads and writes
Q1936840reads and writes
IrfanViewreads · freeware
PhotoLinereads
Picasareads · freeware
Pixelmator Classicreads · proprietary license

And 6 more in the JSON record.

Convert it

To	With	Fidelity	Command and losses
Portable Network Graphics	ImageMagick	Lossless	`convert in.webp out.png` Pixels kept; some metadata, colour profiles or layers may be dropped.
Tagged Image File Format	ImageMagick	Lossless	`convert in.webp out.tif` Pixels kept; some metadata, colour profiles or layers may be dropped.
GIF 89a	ImageMagick	Lossy	`convert in.webp out.gif` Reduced to 256 colours.
JPEG File Interchange Format 1.02	ImageMagick	Lossy	`convert in.webp out.jpg` Lossy compression.

Documentation

kaitai grammar: https://github.com/kaitai-io/kaitai_struct_formats/blob/master/image/webp.ksy

Sources

From Kaitai Struct format gallery, PRONOM, Wikidata. Updated 2026-10-24.

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