GIF to PNG Converter

This tool converts GIF images to PNG in your browser, either as a single PNG of the first frame or as one PNG for every frame of an animation. It is for designers pulling a still out of a GIF, people turning an animation into a sprite sheet or slides, and anyone who needs frames from a GIF without uploading it.

GIF, defined by CompuServe's GIF89a specification, stores images with a palette of at most 256 colours, compressed losslessly with LZW. An animated GIF is a series of image blocks drawn one after another onto a fixed "logical screen". Each frame can be smaller than the screen and placed at an offset, can mark one palette colour as transparent, carries a delay in hundredths of a second, and says what happens to it afterwards — its disposal method: leave it in place, clear its area, or restore what was underneath. That is why you cannot simply cut a GIF into pieces: frame 7 on its own may be a small patch that only makes sense on top of frames 1 to 6.

So this tool includes its own GIF decoder, written to the GIF89a specification and running in your browser. It reads the global and local colour tables, decodes the LZW data, puts interlaced rows back in order, applies transparency, offsets and disposal methods 0 to 3, and composites each frame onto the full logical screen as a browser shows it at that moment. Every PNG you get is therefore the complete picture, at the GIF's full size, not a fragment. We checked the decoder frame by frame against Chrome's own GIF decoder on several real animations, including transparent ones; every pixel matched. For disposal method 2, which the specification calls "restore to background colour", it clears the area to transparent, which is what Chrome does.

PNG is lossless and supports transparency, so each frame keeps the GIF's exact colours, and transparent pixels stay transparent. With "First frame", you get name.png. With "All frames", you get name-frame-001.png, name-frame-002.png and so on, numbered so they sort in order, plus the frame count, the pixel size, the total duration and the loop setting; each frame's delay is listed next to it. A 14-frame, 1430 × 338 px animation from our tests came out as 14 PNGs of about 95 KB each and a total duration of 7 seconds.

Limits: up to 1,000 frames and 400 megapixels of output per GIF in "All frames" mode, files up to 50 MB, and 20 GIFs per batch. PNG frames are larger than the GIF, because GIF only stores the changes between frames and PNG stores every full frame.

Nothing is uploaded. The GIF is read and decoded in your browser's memory; you can confirm in your browser's developer tools (Network tab) that no request carries the file.

1. The file must start with the GIF87a or GIF89a signature and be at most 50 MB; other formats are refused with a message naming what the file really is. 2. The blocks are parsed: logical screen size, global colour table, NETSCAPE2.0 loop count, and for each image its position, size, local colour table, interlace flag, and the preceding Graphic Control Extension (delay, transparency index, disposal method). 3. Each frame's LZW data is decoded (variable-length codes from the minimum code size up to 12 bits, with clear and end codes), and interlaced rows are put back in order (passes starting at rows 0, 4, 2 and 1). 4. Frames are composited onto a transparent canvas the size of the logical screen; any part of a frame outside the screen is clipped. Transparent indices leave the pixel underneath; after a frame is shown, disposal 2 clears its rectangle to transparent and disposal 3 restores the pixels from before it was drawn. 5. Each composited frame is written into a canvas and encoded with canvas.toBlob("image/png"), which is lossless. "First frame" stops after frame 1; "All frames" names files name-frame-001.png onward. Download each, or all as a ZIP.