GIF Resizer – Resize Animated GIFs Online

GIF Resizer – Resize Animated GIFs Online

Resize and optimise animated GIF files entirely in your browser. ToolMi decodes every frame locally, keeps transparency intact and re-encodes the animation with the exact size and quality you choose.

What does this GIF resizer do?

It changes the canvas dimensions of an animated GIF while rebuilding every frame. Unlike resizing only the first image, the downloaded file remains animated.

How to Use

1. Drag a .gif file into the upload area or choose it from your device.
2. Choose 25%, 50%, 75% or 200%, enter another percentage, or switch to pixel dimensions.
3. Keep the aspect-ratio lock on to avoid stretching.
4. Start the resize, compare dimensions and file size, then download the result.

Common Use Cases

• Make an animated GIF smaller for a web page or email.
• Fit a sticker or custom emoji inside a 128, 256 or 512 px box.
• Enlarge a small GIF while keeping its animation.
• Prepare a 640 × 360 animation for a presentation or social post.

Percentage or pixels?

Use percentage when you want a simple proportional change. Use custom dimensions when a website or app specifies a maximum width and height. The common-size buttons fit the GIF inside the chosen box while the aspect-ratio lock is enabled.

Why Resize GIFs Online?

• Reduce GIF file size for faster page loads and better Core Web Vitals.
• Meet social media limits on Discord, Slack, Twitter/X, Telegram and more.
• Keep transparent backgrounds for UI demos, stickers and overlays.
• Prepare marketing assets that fit email, landing page and ad network restrictions.

Key Features of the ToolMi GIF Resizer

• Two resize modes: percentage scale and exact pixel dimensions, plus quick percentage and common-size presets.
• Adjustable encoding quality level to balance colour fidelity and file weight.
• Rebuilds every animation frame and preserves frame timing and transparency.
• 100 % client-side processing: no uploads, no watermark, no data collection.

Step-by-Step: How to Resize a GIF Without Losing Transparency

1. Upload or drag a .gif file into the tool.
2. Pick a quick preset or define the target size.
3. Choose the encoding quality (lower numbers keep more colour detail).
4. Click Start Resize and monitor the progress bar.
5. Download the optimised GIF as soon as the render reaches 100 %.

Best Practices for High-Quality GIF Output

• Keep the quality slider between 1–6 for gradients or UI captures that need smooth colours.
• For looping tutorials, note that many platforms round frame delays shorter than 10 ms up to 20 ms.
• Test different dimensions for chat apps — popular canvas sizes include 512 px, 320 px and 128 px squares.
• Pair the GIF resize tool with the Image Compressor to create WebP or JPEG fallbacks.

FAQ

Does the tool keep transparent backgrounds?
Yes. Frames are composited with alpha preserved, so icons and stickers stay transparent.

Is there a file size limit?
Processing happens locally, so you can work with large GIFs. Very big animations may take longer to encode.

Will the result still animate?
Yes. Every decoded frame is included in the output. The exported GIF is set to loop continuously; very short frame delays are normalized for browser compatibility.