How to Use
- Upload File: Drag and drop your `.png` / `.apng` file or click to select from your device.
- Select Matte Color: Choose a background fallback color (e.g. white, black, or transparent) to optimize edges.
- Convert File: Click the Convert button to start frame extraction and GIF packaging.
- Download GIF: Click the Download button to save your compiled animated GIF.
Core Features
- 100% Local & Private: Your animated files are parsed and compiled entirely in your browser. Your animations are never uploaded to our servers, keeping your custom assets confidential.
- Speedy Transcoding: Bypasses network upload latency. Converted frames are generated locally in seconds.
- Alpha-Matting Support: Choose a custom matte background color to ensure transparent vector shapes blend smoothly into the 1-bit GIF palette.
- Free & Unlimited: No subscription restrictions, file size caps, or queue waiting lines.
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Calculation Logic
Animated PNG (APNG) expands the standard PNG format to support 24-bit color depth and full 8-bit alpha transparency across multiple animation frames.
This tool uses client-side JavaScript to parse the APNG's binary stream (including the `acTL`, `fcTL`, and `fdAT` chunks), extracting raw frame pixel buffers and frame delay parameters. The frames are then processed on a canvas (applying transparency flattening if requested) and re-encoded into an animated GIF container using our local GIF packaging engine.
FAQ
Will my converted GIF retain full transparency?
GIF only supports 1-bit transparency (a pixel is either 100% transparent or 100% opaque). To prevent rough edges, use the background matte color picker in our tool to blend semi-transparent pixels smoothly.
Why does my PNG upload as a static image?
Make sure the file you are uploading is indeed an Animated PNG (APNG) rather than a standard static PNG. Standard PNG files will convert to a single-frame GIF.
Is there a file size limit?
No file size limits are enforced because the conversion happens entirely on your local computer. It is only limited by your device's browser memory.
Can I change the frame rate?
Yes, you can speed up or slow down the output animation using the speed scaling slider in the configuration panel.