APNG to WebP Converter

Encoding: the APNG uses lossless DEFLATE per frame, like PNG; WebP uses lossy VP8 coding or lossless VP8L, and the download is a lossy WebP at the quality you choose (lossless under More options), keeping transparency.

Bit depth: 8 bits per channel in the APNG; WebP allows 8 bits per channel, and the WebP written here has 8 bits per channel.

Colour: RGB or an indexed palette in the APNG; WebP supports RGB; lossy WebP stores colour at half resolution (4:2:0), written here as 8-bit sRGB.

Transparency: the APNG stores it as full alpha on every frame; the WebP keeps it as a separate alpha plane, available in lossy as well as lossless files.

Animation: fcTL frame-control chunks with fdAT frame data after the first image; the WebP keeps every frame and its timing, as ANMF frame chunks, each with its own delay and blending.

Metadata: the APNG can carry the same text and ICC chunks as PNG; WebP can carry EXIF, XMP and ICC chunks, but nothing is copied across.

APNG extends PNG with animation frames. Unlike GIF it keeps full 24-bit colour and smooth 8-bit transparency, at the cost of larger files.

An APNG is a valid PNG with an acTL chunk announcing the frame count and loop count; each later frame is an fcTL chunk (size, offset, delay, blend and dispose rules) followed by fdAT data. Software that does not know APNG simply shows the first frame.

APNG files usually come from animated stickers (LINE and Discord among others), UI animations and Firefox-era web graphics.

WebP is Google's web image format. It supports lossy and lossless compression, transparency and animation, and is typically 25 to 35 percent smaller than JPEG at the same visual quality.

A WebP is a RIFF file: 'RIFF', a length, 'WEBP', then chunks. A simple lossy file is one VP8 chunk and a lossless one is VP8L; the extended VP8X header announces alpha, animation, ICC, EXIF or XMP chunks.

WebP is the better choice for images on websites and in apps, while APNG suits high quality animated stickers and UI animations.

WebP strengths: 25-35% smaller than JPEG; Transparency and animation in one format; Supported by every modern browser. Drawbacks to weigh: Some older desktop apps and photo printers cannot open it; Max 16383 px per side.