APNG

Writable

image · also known as APNG

APNG is an extension of the PNG format, adding support for animated images. It is intended to be a replacement for simple animated images that have traditionally used the GIF format, while adding support for 24-bit images and 8-bit transparency. APNG is intended as a simpler alternative to MNG. APNG is backwards-compatible with PNG; any PNG decoder should be able to ignore the APNG-specific chunks and display a single image.

Identify it

Extensions	`.png.apng`
MIME types	`image/vnd.mozilla.apngimage/pngimage/apng`
Signatures	`89504e470d0a1a0a0000000d49484452` at byte 0 (APNG)
PRONOM	`fmt/935`
Wikidata	`Q433224`
Library of Congress	`fdd000649`

Not sure your file is this? Identify it from its first bytes, in your browser.

Open it

ImageMagickOpen sourcereads and writes · ImageMagick License
ImageMagick (WebAssembly)Open sourcereads and writes · Apache-2.0
Q138052002Open sourcereads and writes · MIT License
cjxlOpen sourcereads · 3-clause BSD License
libjxlOpen sourcereads · 3-clause BSD License
Mozilla FirefoxOpen sourcereads · Mozilla Public License, version 2.0
PixiEditorOpen sourcereads · GNU Lesser General Public License, version 3.0
Q847465Open sourcereads · GNU Lesser General Public License, version 2.1 or later

Convert it

Convert a file in your browser The steps marked “in browser” run on your machine; nothing is uploaded.

To	With	Fidelity	Command and losses
BMP 5.0	ImageMagick (WebAssembly)	Lossless	in browser Pixels kept; some metadata, colour profiles or layers may be dropped.
PNG	ImageMagick	Lossless	`convert in.apng out.png` Pixels kept; some metadata, colour profiles or layers may be dropped.
PNG	ImageMagick (WebAssembly)	Lossless	in browser Pixels kept; some metadata, colour profiles or layers may be dropped.
Quite OK Image Format	ImageMagick (WebAssembly)	Lossless	in browser Pixels kept; some metadata, colour profiles or layers may be dropped.
TIFF	ImageMagick	Lossless	`convert in.apng out.tif` Pixels kept; some metadata, colour profiles or layers may be dropped.
TIFF	ImageMagick (WebAssembly)	Lossless	in browser Pixels kept; some metadata, colour profiles or layers may be dropped.
PDF	ImageMagick (WebAssembly)	Partial	in browser The image is embedded in a PDF page.
AVIF	ImageMagick (WebAssembly)	Lossy	in browser Lossy compression.
GIF 89a	ImageMagick	Lossy	`convert in.apng out.gif` Reduced to 256 colours.
GIF 89a	ImageMagick (WebAssembly)	Lossy	in browser Reduced to 256 colours.
ICO	ImageMagick (WebAssembly)	Lossy	in browser Icons are limited to 256 × 256 pixels.
JFIF 1.02	ImageMagick	Lossy	`convert in.apng out.jpg` Lossy compression.
JFIF 1.02	ImageMagick (WebAssembly)	Lossy	in browser Lossy compression.
JPEG XL	ImageMagick (WebAssembly)	Lossy	in browser Lossy compression.
WebP	ImageMagick	Lossy	`convert in.apng out.webp` Lossy compression.
WebP	ImageMagick (WebAssembly)	Lossy	in browser Lossy compression.

Documentation

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

Sources

From Converters (FFmpeg, ImageMagick, Pandoc, LibreOffice), WebAssembly engines (ImageMagick, FFmpeg, Pandoc, 7-Zip, GDAL, Assimp, resvg), Just Solve the File Format Problem (File Formats Wiki), Kaitai Struct format gallery, PRONOM, Wikidata. Updated 2026-10-26.

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