About APNG.dev
We built the tools we wished existed — free, fast, private APNG tools that run entirely in your browser.
Our Mission
APNG.dev is built on a simple idea: working with animated PNG files should be easy, free, and private. We were frustrated by tools that required account sign-ups, imposed file size limits, or uploaded your images to servers in unknown locations.
So we built the alternative: a set of professional-grade APNG tools that run 100% in your browser using modern web technologies. Your files never leave your device. There are no accounts, no subscriptions, and no file size limits imposed by server costs — because there are no servers involved in the conversion process.
Privacy First
All conversions and compressions happen locally using browser APIs and WebAssembly. Your files are never uploaded, logged, or stored on any server.
No Limits
Because we don't process files on our servers, there are no artificial file size limits. Convert files as large as your browser can handle.
Always Free
The core tools are free forever. We believe professional-quality image tools should be accessible to everyone — students, developers, designers, and creators.
Open Format
APNG is an open, ISO-standardized format. We believe in promoting open web standards and helping developers and designers adopt better formats.
The Technology
APNG.dev is built with Next.js and runs conversion logic entirely in the browser using the Canvas API, WebAssembly, and modern browser APIs like CompressionStream and OffscreenCanvas.
Our APNG encoder implements the full APNG specification, including animation control chunks (acTL), frame control chunks (fcTL), and frame data chunks (fdAT). GIF decoding is handled by a custom LZW decoder built from the GIF89a specification.
Start using the tools
Convert your first animated PNG in seconds — no sign-up required.