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GIF Speed Changer

Speed up or slow down any animated GIF using a precise multiplier. setpts filter via ffmpeg.wasm — palette-aware, browser-only, no upload.

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About this tool

GIF Speed Changer alters the playback speed of any animated GIF using ffmpeg.wasm's setpts filter. Pick a preset (0.25×, 0.5×, 2×, 4×) or type a custom multiplier from 0.1 to 10. The pipeline is two-pass: first build an optimal palette from the time-shifted frames, then encode the final GIF with that palette so colour quality survives the change. Speeding up shortens the GIF; slowing down lengthens it. Frame count is preserved — only per-frame delays change — so the visual content remains identical, just at a different pace. Use this for fast-forwarded tutorials, slow-mo reactions, or matching a GIF's length to a specific message-board or chat-app autoplay window.

Why use it

  • Precise speed control with both presets and custom values

  • Two-pass palette keeps colours clean after the time shift

  • Frame count preserved — visual quality unchanged

  • Wide range from 0.1× (10× slower) to 10× (very fast)

  • 100% browser — your GIF never uploads

  • Free, no watermark, no signup

How to use

  1. Upload your animated GIF.
  2. Click a preset (0.25×, 0.5×, 2×, 4×) or type a custom multiplier into the box.
  3. Click 'Adjust Speed' and wait for the two-pass encoder.
  4. Preview the result and click Download to save.

When it helps

  • Fast-forwarding a long tutorial GIF that is currently boring
  • Slowing down a fast reaction GIF so subtle details become visible
  • Matching a GIF's loop time to a specific autoplay window on a forum
  • Producing a slow-motion comedy effect on an action GIF
  • Speeding up a screen-record GIF that was captured at the wrong rate
  • Creating exaggerated comic timing on memes by slowing key beats

Examples

Fast-forward tutorial

Input

12-second how-to GIF, 2× speed

Expected result

6-second sped-up tutorial showing the same steps faster

Slow-mo reaction

Input

1-second face-reaction GIF, 0.5× speed

Expected result

2-second slowed reaction perfect for comic emphasis

Custom timing for forum

Input

5-second meme GIF, 1.6× speed

Expected result

3.1-second GIF that fits a specific autoplay window without truncation

Tips

  • For comedic timing, pair 0.5× on the punchline frames with 2× elsewhere — but this tool changes the whole file, so split first if needed.
  • Stay under 5× speed-ups: GIF's 10 ms delay granularity makes very fast GIFs unreliable across viewers.
  • Slowing GIFs below 0.25× rarely looks smooth — the source frame rate is usually too low to support real slow motion.
  • Always re-run through the GIF Compressor after major speed changes — the palette can be re-tuned to the new file.
  • If the GIF was originally captured from video, consider re-rendering at the new speed from the source video instead, with the GIF to Video tool in reverse.
  • Combine with the GIF Reverser for retro-comedy effects: reverse first, then play at 1.5× speed.

Frequently Asked Questions

Does my GIF leave my device?
No — ffmpeg.wasm runs locally in the tab. Nothing uploads to a server.
What does the multiplier mean?
2× plays the GIF twice as fast (half the duration); 0.5× plays it half as fast (double the duration). 1× would be unchanged.
Does the file size change?
Slightly. Speeding up shortens the GIF and usually shrinks the file modestly. Slowing down lengthens it and usually grows the file modestly. Most of the size comes from frame count, which stays the same.
Will I lose frames if I speed up?
No — every frame is preserved. Only per-frame delays shrink. Frame interpolation is not used.
Can I slow down beyond 0.1× (10× slower)?
Not in this UI — extreme slowdowns produce huge files and rarely look good because the underlying frame rate is too low. Use a video tool with frame interpolation for true slow motion.
Will looping be preserved?
Yes — the loop count metadata carries over unchanged.
Why is my fast-forwarded GIF choppy?
GIF stores frame delays in 10 ms increments. At very high speeds the delays round to zero and viewers may render at a default speed. Stay below 5× for reliable playback.
Why does it require Chrome or Edge?
ffmpeg.wasm requires SharedArrayBuffer, only available on cross-origin-isolated pages in Chromium-based browsers.

Explore the category

GIF Cropper Crop a rectangular region from any animated GIF. Set X/Y offset and crop dimensions in pixels. Palette-aware via ffmpeg.wasm. Browser-only. GIF Compressor Reduce animated GIF file size by lowering FPS, scaling dimensions and tuning palette. Two-pass palette encoding via ffmpeg.wasm — browser only. GIF Resizer Resize animated GIFs to any width or height. Lock the aspect ratio or stretch — Lanczos resampling, palette-aware. Browser-only, no upload. GIF to Video Converter Convert animated GIFs to MP4 (H.264) or WebM (VP9) video files. Smaller, smoother and far more efficient than GIF. Browser-only via ffmpeg.wasm. GIF Reverser Play any animated GIF backwards, or build a boomerang loop (forward + reverse). 100% browser via ffmpeg.wasm. No upload, no watermark. GIF Frame Splitter Split any animated GIF into individual frames. Download each as PNG or JPG, or all at once as a ZIP. ffmpeg.wasm + JSZip in the browser.
GIF vs WebP vs MP4: Which Animation Format Wins on the Web? Animated GIFs are nostalgic but heavy. WebP and MP4 deliver the same motion at a fraction of the size. We compare file size, browser support Mar 2026 · 9 min

Glossary

setpts
An FFmpeg filter that rewrites Presentation TimeStamps. setpts=0.5*PTS doubles speed; setpts=2*PTS halves it.
PTS
Presentation TimeStamp — the moment at which a frame should be displayed. Speed changes scale all PTS values.
Frame delay
GIF stores the duration each frame is shown. Speed changes scale these delays.
Palette
The 256-colour table used to encode each GIF frame; rebuilt here to match the time-shifted output.
GIF89a
The 1989 GIF revision that supports per-frame delays measured in 10 ms increments.
ffmpeg.wasm
Browser build of FFmpeg used for the speed pipeline locally without server round-trips.