Choose a GIF
Open one GIF from your device or try the sample. The tool reads it locally and shows an estimate for one animation cycle.
Make an animated GIF move at your pace. Choose a speed from 0.25× to 4× while keeping every frame and its original image data. GIF files never leave your browser.
No file uploads. No waiting in a server queue.
Your new animation will appear here.
The image data stays unchanged. Only frame timing is edited.
Download GIF ↓Open one GIF from your device or try the sample. The tool reads it locally and shows an estimate for one animation cycle.
Try 0.5× for a slower reaction or 2× for a quicker walkthrough. The estimate shows how timing limits affect your selection before you apply it.
Apply the speed, check the result and download it as a GIF. The original file stays on your device, so you can try another multiplier from the same source.
An animated GIF stores a series of pictures and timing instructions. GifLoom changes those instructions while copying the compressed image data. That keeps the original palettes, frame order, dimensions and transparent areas without adding or dropping pictures.
A 2× multiplier aims to make each wait half as long; 0.5× aims to double it. A one-second source cycle would become about half a second or two seconds respectively, when its delays can represent the change. GIF uses 10 ms timing units, so rounding means some requests are approximate.
For a non-1× export, GifLoom treats source delays below 20 ms or missing timing blocks as 100 ms before applying the multiplier. The tool uses a minimum new delay of 20 ms. These are explicit tool policies, and a viewer may use different playback rules. The result reports its estimated timing change instead of promising an exact on-screen speed.
Existing timing blocks keep their transparency and disposal flags. A missing timing block is added only when a speed change needs it. At exactly 1×, the validated file is copied byte for byte, including its existing timing instructions.
Already-short frames may not get any faster under the tool’s minimum delay. Very slow settings can exceed the GIF timing field’s maximum of 655.35 seconds for one frame; in that case, the tool asks for a faster setting instead of silently shortening the pause. A single-frame file remains still, whatever multiplier you choose.
This is a speed adjustment, not an FPS editor or a video conversion. It keeps all source frames and the original loop setting. Adding a missing timing block can slightly increase bytes, so a speed change is not a file-size optimization.
Need fewer bytes? Compress GIF file size. Use the GIF Resizer for exact geometry, reverse animated GIF playback, or merge GIFs into a chosen sequence. Trim a GIF to a selected time interval. Use the GIF Splitter to save separate time-based clips.
BEFORE YOU CHANGE THE TEMPO
Choose a local GIF, then set a speed multiplier or use a preset. Select Apply speed to validate the file and update its frame timing. Preview the result and download it directly. GIF files never leave your browser for processing.
Choose a multiplier above 1×, such as 1.5× or 2×. GifLoom shortens the waiting time between frames without removing any frames. Rounded timings and the tool’s 20 ms minimum output delay can limit the speed change, so check the actual cycle estimate.
Choose a multiplier below 1×. For example, 0.5× aims to double each frame’s waiting time, while 0.25× aims to make the cycle four times as long. If a frame would exceed the GIF timing field’s 655.35-second maximum, choose a faster setting.
The tool copies the original compressed image data and color tables. It edits timing control fields without drawing new frames or quantizing colors. Dimensions, frame order, transparency and disposal instructions stay intact. File size may grow slightly when a missing timing block must be added.
GIF delay fields use 10 ms units. GifLoom rounds the requested delays to those units and uses a 20 ms output minimum for non-1× exports. Source delays of 0 or 10 ms, or missing delays, use a stated 100 ms assumption. The actual estimate can therefore differ from your selected multiplier, and viewers may apply their own timing rules.
The downloaded GIF is byte-identical to the validated input. Existing short delays and missing timing blocks are left unchanged. The cycle estimate still uses the tool’s 100 ms assumption for those frames; it is not a promise of exact playback timing in every viewer.
Yes. Every source frame stays in its original order, and the original loop extension is copied unchanged. A GIF that plays once, repeats a finite number of times or loops forever keeps that setting. A single-frame GIF remains a single frame and does not gain motion.
This release uses a speed multiplier rather than an exact-duration or FPS control. A requested 2× speed aims to halve the cycle length, subject to the stated timing rules. The estimated cycle before and after processing helps you check the result.
The input may be damaged, have unsupported extensions or exceed the local processing budget. Limits are 50 MB input and output, 1,000 frames, 4 million pixels per frame and 40 million total frame pixels. Processing stops after 90 seconds without keeping a partial result. Try a smaller GIF or a supported speed, then run it again.
Files never leave your browser for speed changes. The input and result stay in browser memory until you remove the file or leave the page. Downloads remain under your control on your device. Optional analytics record only consented page and tool events, without file names, settings or GIF content.