PNG to APNG Converter
Convert PNG to APNG in your browser. PNG files usually come from screenshots, design exports, logos and web graphics; 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
PNG expected · other image formats also work
How to use PNG to APNG
- 1
Add your PNG 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 png to apng
Where the APNG goes next
APNG opens in every current browser, plus a few editors and sticker tools.
APNG next to PNG
Both sides are lossless, so the size depends on how well the APNG encoder handles this picture compared with the PNG's lossless DEFLATE with a prediction filter chosen per row.
Written without a lossy pass
The APNG is written losslessly, so the pixels decoded from the PNG arrive unchanged, apart from precision beyond 8 bits per channel.
Processed on your device
Your images are decoded, edited and encoded inside this browser tab by Web Workers. Nothing is uploaded to a server.
PNG vs APNG
What changes from PNG to APNG
Encoding: the PNG uses lossless DEFLATE with a prediction filter chosen per row; APNG uses lossless DEFLATE per frame, like PNG, and the download is an animated PNG with every frame in full colour.
Bit depth: 1, 2, 4, 8 or 16 bits per channel in the PNG; APNG allows 8 bits per channel, and the APNG written here has 8 bits per channel. 16-bit PNGs from photo and scientific software are reduced to 8 bits per channel.
Colour: RGB, greyscale, or an indexed palette of up to 256 colours in the PNG; APNG supports RGB or an indexed palette, written here as 8-bit sRGB.
Transparency: the PNG stores it as a full alpha channel, so edges and shadows can fade smoothly; the APNG keeps it as full alpha on every frame.
Metadata: the PNG can carry text chunks, an ICC profile, physical resolution and EXIF in an eXIf chunk; APNG can carry the same text and ICC chunks as PNG, but nothing is copied across.
About PNG
PNG stores pixels losslessly with full alpha transparency. It is ideal for screenshots, logos, UI and anything with sharp edges, but photos saved as PNG are several times larger than JPEG.
A PNG opens with an 8-byte signature and is a chain of chunks, each with its own CRC: IHDR (size, depth, colour type), optional PLTE and tRNS for palettes, one or more IDAT chunks with the compressed rows, and IEND.
PNG files usually come from screenshots, design exports, logos and web graphics.
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 PNG to APNG makes sense
APNG is the better choice for high quality animated stickers and UI animations, while PNG suits screenshots, logos, graphics and anything that needs transparency.
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
- 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 PNG to APNG lose quality?
APNG is written losslessly, so the pixels are stored exactly as decoded. 16-bit PNGs from photo and scientific software are reduced to 8 bits per channel.
Is transparency kept in the APNG?
Yes. PNG stores it as a full alpha channel, so edges and shadows can fade smoothly, and the APNG is written with an alpha channel, so transparent areas stay transparent.
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.