WebP to APNG Converter
Convert WebP to APNG in your browser. WebP files usually come from websites, Chrome's Save image as, CDNs and Android apps; APNG is the better fit for high quality animated stickers and UI animations. You get an animated PNG with every frame in full colour. Nothing is uploaded.
- Processed locally
- No upload, no wait
- No sign-up
- No watermark
Drop images here
or choose files · paste with Ctrl/⌘ V
WebP expected · other image formats also work
How to use WebP to APNG
- 1
Add your WebP files: drop them here, choose them, or paste from the clipboard.
- 2
There is nothing to tune: the APNG is written losslessly. Resizing and rotating are under More options if you need them.
- 3
Click Convert. Each file is decoded and encoded in a background thread on this device.
- 4
Download the .png files one at a time or together as a ZIP.
Why use Aback Images for webp to apng
Where the APNG goes next
APNG opens in every current browser, plus a few editors and sticker tools.
APNG next to WebP
The APNG keeps the decoded pixels without lossy compression, so expect it to be larger than the WebP.
No new artefacts
WebP is already lossy, since it stores lossy VP8 coding or lossless VP8L; the APNG keeps the decoded pixels losslessly, so this step adds no compression damage of its own.
Processed on your device
Your images are decoded, edited and encoded inside this browser tab by Web Workers. Nothing is uploaded to a server.
WebP vs APNG
What changes from WebP to APNG
Encoding: the WebP uses lossy VP8 coding or lossless VP8L; APNG uses lossless DEFLATE per frame, like PNG, and the download is an animated PNG with every frame in full colour.
Bit depth: 8 bits per channel in the WebP; APNG allows 8 bits per channel, and the APNG written here has 8 bits per channel.
Colour: RGB; lossy WebP stores colour at half resolution (4:2:0) in the WebP; APNG supports RGB or an indexed palette, written here as 8-bit sRGB.
Transparency: the WebP stores it as a separate alpha plane, available in lossy as well as lossless files; the APNG keeps it as full alpha on every frame.
Animation: ANMF frame chunks, each with its own delay and blending; the APNG keeps every frame and its timing, as fcTL frame-control chunks with fdAT frame data after the first image.
Metadata: the WebP can carry EXIF, XMP and ICC chunks; APNG can carry the same text and ICC chunks as PNG, but nothing is copied across.
About WebP
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 files usually come from websites, Chrome's Save image as, CDNs and Android apps.
About APNG
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.
When converting WebP to APNG makes sense
APNG is the better choice for high quality animated stickers and UI animations, while WebP suits images on websites and in apps.
APNG strengths: Full colour animation (no 256-colour limit); Smooth alpha transparency; Falls back to a still PNG in old software. Drawbacks to weigh: Large files; Few editors can create it.
Limitations
- WebP images saved from websites are often already resized and compressed for the page, so the result cannot be sharper than that copy.
- Programs that do not understand APNG show only its first frame, so check where the animation will play.
- APNG files are usually larger than animated WebP, while GIF remains the most widely supported animation format.
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Frequently asked questions
Does converting WebP to APNG lose quality?
APNG is written losslessly, so the pixels are stored exactly as decoded. Artefacts already in the WebP stay, but nothing new is lost.
Is transparency kept in the APNG?
Yes. WebP stores it as a separate alpha plane, available in lossy as well as lossless files, and the APNG is written with an alpha channel, so transparent areas stay transparent.
Is the animation preserved?
Yes. Every frame and its timing are converted to APNG. Turn off Keep animation if you only want the first frame.
Which apps open APNG files?
Every current browser, plus a few editors and sticker tools.
Are my images uploaded anywhere?
No. Processing happens inside your browser with WebAssembly and Web Workers. The site only downloads the app code and codecs; your files never leave your device. You can confirm this with the live upload counter on the tool, or in your browser's network panel.
Can I process many files at once?
Yes. Drop a whole selection or folder. Files are processed in parallel on several worker threads, each result can be downloaded on its own, and everything can be saved as one ZIP.
Is it free? Is there a file limit or watermark?
It is free with no account, no watermark and no daily limit. The only limit is your device's memory: very large images (over roughly 100 megapixels) may be refused to keep the tab from crashing.