Free GIF Speed Changer
Slow down to 0.25x for dramatic slow motion, or speed up to 4x for time-lapse. Frame delays adjusted in your browser — no upload, no account.
Drop GIF here or click to browse
Converts in your browser — nothing uploaded
How It Works
Upload your GIF
Drop your GIF file into the tool or use the file picker above.
Select a speed multiplier
Choose from 0.25x, 0.5x, 1x (original), 1.5x, 2x, or 4x.
Download the modified GIF
Click Apply Speed. The tool rewrites each frame's delay value in your browser. Preview the result, then download.
How GIF Speed and Frame Delay Works
The GIF format controls animation timing through a per-frame delay value stored in the Graphic Control Extension block of each frame. The delay is measured in centiseconds (hundredths of a second). A value of 10 means 100 ms per frame — an effective rate of 10 FPS. A value of 4 means 40 ms per frame, equivalent to 25 FPS.
Changing GIF speed means multiplying or dividing every frame's delay by the selected multiplier. Slowing a GIF to 0.5x doubles all delays — each frame lingers twice as long, halving the apparent playback speed. Speeding up to 2x halves all delays. Crucially, no frames are added or removed; only the timing metadata changes. This is different from video playback speed adjustment, which can interpolate new intermediate frames for smoothness.
Most browsers enforce a minimum frame delay of 20 ms (2 centiseconds). Any delay value lower than 2 centiseconds is silently clamped to 2 centiseconds (20 ms), meaning the practical maximum frame rate in a browser is ~50 FPS regardless of what is written in the file. If you speed up a GIF whose frames already have short delays, the browser's floor will cap the visible speed improvement.
PTS manipulation: In video terminology, PTS (Presentation TimeStamp) is the value that tells a decoder when to display each frame. The GIF equivalent is the cumulative sum of frame delays. When this tool adjusts GIF speed, it rewrites the delay for every Graphic Control Extension block in the file — effectively rescaling the entire PTS timeline. Because only delay metadata is modified, the pixel data for each frame is untouched. File size remains essentially identical to the original — the delay fields account for just a few bytes per frame out of the total file.
Key Features
Slow-motion sports loops
Slowing a dunk, serve, or swing to 0.25x lets viewers study technique in a shareable, looping GIF without needing a video player.
UI/UX demo GIFs
Software demos recorded at normal speed can feel rushed. Slowing to 0.5x gives viewers time to follow each step without pausing.
Time-lapse loops
Speed up a long-process GIF — cooking, construction, plant growth — to 4x to create a compelling time-lapse that still fits a social post.
Fix export mismatches
GIFs exported from GIMP or Photoshop sometimes have incorrect delays. Use 1.5x or 2x to correct a GIF that plays too slowly after export.
Comedy timing
A reaction GIF landing at 1.5x speed can feel 10x funnier. Speed is everything in comedy pacing.
Zero server cost
All processing runs via WebAssembly in your browser. No data leaves your device, no rate limits, no account required.
Format Comparison
| Multiplier | Effect on Delay | Best Creative Use |
|---|---|---|
| 0.25x | 4× longer delays | Dramatic slow motion, sports replays, detail inspection |
| 0.5x | 2× longer delays | Smooth slow motion, tutorial walkthroughs, dance loops |
| 1.5x | Slightly shorter delays | Snappier feel, fixing sluggish source GIFs |
| 2x | Half-length delays | Energetic loops, quick reactions, meme GIFs |
| 4x | Quarter-length delays | Time-lapse effect, frenetic energy, rapid slideshows |