GIF Resizer
Resize animated GIF dimensions with aspect ratio lock directly in your browser. Scale down pixel size and reduce file weight without uploading any data.
GIF, APNG, WebP, AVIF · static images are accepted too
Tips
- Halving the pixel width and height cuts total pixel count and file size by roughly three quarters.
- Keep the aspect ratio lock enabled to avoid distorting image proportions across all frames.
- Downscaling yields crisp results, whereas upscaling pixel art or animation introduces noticeable blur.
How to use it
- 1 Upload an animated GIF file from your device.
- 2 Enter new width or height values, keeping the aspect ratio locked to prevent distortion.
- 3 Review the rescaled animation preview and frame dimensions.
- 4 Export and save the resized GIF file directly to your disk.
What you should know
Animated GIFs store sequences of uncompressed or LZW-compressed raster frames, causing file sizes to balloon rapidly at higher display resolutions. Because GIF lacks modern inter-frame predictive compression like H.264 or AV1 video codecs, raw pixel dimensions directly dictate payload size. When embedding animations into websites, newsletters, or chat apps with strict upload caps, scaling down width and height is the most effective way to lower bandwidth without sacrificing frame rate. Halving dimensions removes three out of every four pixels per frame, drastically reducing decoding memory overhead on mobile browsers and legacy systems.
This tool extracts each frame locally, resamples the image matrix to your target width and height, and re-encodes the sequence into a standard GIF stream. The built-in aspect ratio lock preserves original geometry, preventing distorted stretched pixels. Because each frame is limited to a global or local 256-color palette, resampling regenerates optimized color tables while retaining existing 1-bit transparency masks and frame delay timings. Processing takes place directly within browser memory using WebAssembly, ensuring metadata like creation comments is cleaned while keeping your media secure without external server transfers.
Measured output sizes
Test file: a 480×270, 50-frame GIF (5 seconds at 10 fps, 4.68 MB) cut from animated film footage and already saved with an optimized palette. Run in Chrome 154 on a desktop PC with the aspect ratio locked; each run took between 0.4 and 1.6 seconds.
| Target width | Output | Frames | GIF size | Change |
|---|---|---|---|---|
| 480 px | 480×270 | 50 | 5.08 MB | +9% |
| 400 px | 400×225 | 50 | 3.13 MB | −33% |
| 360 px | 360×203 | 50 | 2.61 MB | −44% |
| 320 px | 320×180 | 50 | 2.11 MB | −55% |
| 240 px | 240×135 | 50 | 1.24 MB | −73% |
| 160 px | 160×90 | 50 | 721 KB | −85% |
- Leaving the width at 480 px still rewrites every frame with a fresh 256-colour palette, and the file ends 9% larger at 5.08 MB. Run the tool when you are actually going smaller.
- The file falls faster than the width does: 360 px keeps 75% of the width but sheds 44% of the bytes, and 240 px halves the width for a 73% cut.
- 320 px keeps all 50 frames and lands at 2.11 MB, a reasonable stop for something you want to drop into a page.
- Frame count never changes here. If 721 KB at 160 px is still too much, the next levers are dropping frames and cutting colours, which the GIF compressor handles.
Frequently asked questions
Does resizing an animated GIF reduce its file size?
Yes, decreasing the pixel dimensions significantly reduces file size because fewer pixels are stored and compressed for every frame in the animation sequence.
Will transparent backgrounds be preserved during resizing?
Yes, 1-bit palette transparency is maintained across all frames during resampling, preserving clear backgrounds for icons and overlay stickers.
Are my GIF files uploaded to a remote server for processing?
No, all frame decoding, bicubic scaling, and GIF re-encoding run entirely within your browser's local memory, so your files never leave your device.
Guides
Articles and format references related to this tool.
Related tools
- Rotate GIF Rotate animated GIFs by 90, 180, or 270 degrees and flip frames horizontally or vertically. Preserve animation speed and colors securely inside your browser.
- GIF Cutter Trim animated GIFs by selecting start and end frames directly in your browser. Cut unwanted sections, reduce file size instantly, and keep your files private.
- GIF Cropper Crop animated GIF files directly in your browser. Select your exact framing to eliminate unwanted borders and reduce file sizes without server uploads.
- Fade Slideshow GIF Maker Create animated GIF slideshows with smooth crossfade transitions between photos. Adjust display timing and transition speed locally inside your browser.
- GIF Caption Box Add top or bottom text caption boxes to animated GIFs for memes and social posts. Customize colors and font sizes while frames render locally in your browser.
- GIF Halftone Filter Apply a vintage halftone dot pattern to your GIF frames right in your browser. Reduce file size with simplified color palettes without uploading your media.