Free GIF Resizer

GIF file size scales roughly with the square of the pixel dimensions. Halving the width of a GIF — from 800 px to 400 px — reduces the canvas area to one quarter, which typically cuts the file size by 60–75%. This makes resizing the single most impactful optimization you can apply to an oversized animated GIF, far outperforming lossy compression alone.

Each platform where GIFs are shared has a different maximum display width. Uploading a GIF that is wider than the platform's display container wastes bytes — the browser downloads all those extra pixels and then discards them during rendering. Resizing to match the target container eliminates that waste entirely.

Resizing is also the solution when you have a retina (2x) GIF that was captured or exported at double resolution for high-DPI screens. Serving the 2x file to users on standard 1x displays wastes exactly half the bytes. Downsizing to the 1x target width produces an identical on-screen appearance on standard displays while halving the download size.

Aspect ratio preservation prevents the distorted, "squished" appearance that results from setting width and height independently. The correct height is calculated as: new_height = round(original_height × new_width / original_width). Every frame in the animation uses the same new dimensions, ensuring geometric consistency — critical for animated content where even a single-pixel height difference between frames causes visible jitter on some GIF renderers.