Can I set width and height to unrelated values?

ReduceGIF’s resizer keeps aspect ratio locked: you pick a scale or a width, and height follows. That avoids accidental stretch. For a different framing without stretch, crop first, then resize.

Does changing dimensions affect frame timing?

Scaling frames does not intentionally change delays. The animation should keep the same timing and loop behavior at the new size.

Will a smaller width and height always reduce file size?

Usually yes, because each frame has fewer pixels. Exact savings depend on the content. Compress afterward if you still need a smaller file.

How to Change GIF Width and Height

Changing a GIF’s width and height means scaling every frame to new pixel dimensions so the animation still plays correctly. On ReduceGIF that is the job of the GIF resizer: set a percentage scale or a target width; height follows to keep proportions.

If you only need to cut edges without changing how dense the remaining image is, use the GIF cropper instead.

Width and height vs crop

Intent	Use
Same picture, smaller or larger canvas	Resize — changes width and height together
Keep pixel density, change framing	Crop — removes edges
Same dimensions, smaller encoding	Compress

Stretching width without height (or the reverse) produces a distorted GIF. This site’s resizer avoids that by locking aspect ratio—see also the notes on the resize tool page.

Step-by-step

Open /resize/.
Upload the animated GIF.
Choose scale percentage or a max / target width that matches your layout.
Confirm the resulting height still fits the design (it will update with the locked ratio).
Preview the loop.
Download. Optionally compress for a byte limit.

Resize Your GIF

Choosing numbers that make sense

Match CSS or design width so the file is not larger than the box that displays it.
Prefer downscaling from a high-quality export over upscaling a tiny meme.
For chat, start with a few hundred pixels of width; see compress for Discord.
For websites, see optimize GIFs for websites.

Example intuition (not a promise for your file): scaling to 50% width and 50% height leaves about 25% of the pixels per frame.

When you need a different aspect ratio

Crop to the frame shape you want (for example a tighter square subject).
Resize that result to the final width.
Compress if the destination still has a size cap.

Do not expect the resizer alone to turn a wide landscape GIF into a tall portrait without cropping.

Pitfalls

Setting a tiny width then stretching it large with CSS—looks soft and wastes the point of resizing.
Upscaling to “fill” a hero—detail cannot be invented.
Skipping compress when a CMS still rejects the file after a modest resize.