How to Speed Up a Video (Free, in Your Browser)

Open the [Change Video Speed](/change-video-speed) tool, drop in your file, pick a speed and download the result. The whole job runs in your browser, so the video is never uploaded and there is no watermark or account step.

The slider runs from 0.25x to 4x, with quick presets at 0.5x, 1.5x and 2x. A 10-minute clip at 2x becomes 5 minutes, and at 4x it becomes 2 minutes 30 seconds. The output is always an MP4, whatever format you started with. Longer files take longer because the browser re-encodes every frame, so a phone clip of a minute or two finishes far faster than an hour-long recording.

Match the speed to what the viewer needs to follow. 1.25x to 1.5x is a gentle speed-up for talking-head videos and lectures: speech stays easy to understand. 2x suits software demos and screen recordings where nothing important happens in the pauses. 3x to 4x is for time-lapse effects, long commutes, cooking steps or a build process, where you want the shape of the action rather than every detail.

If the clip has speech, test a short section first. Voices stay natural up to about 2x for most people, and beyond that the words blur together even when the pitch is correct. For anything where precision matters, cut the boring part out with [Trim Video](/trim-video) instead of speeding the whole clip up.

The audio is time-stretched, not just played faster, so voices do not turn into chipmunks. Under the hood, the audio filter only accepts a factor between 0.5 and 2 per step, so the tool chains steps whose factors multiply to your target. At 4x that is two 2x steps back to back.

If you did want the high-pitched effect, that is a different tool, and the reverse problem is covered in our guide to [fixing a chipmunk voice after changing video speed](/blog/chipmunk-voice-after-changing-video-speed). If your clip has no audio track at all, or one the browser cannot decode, the tool retries without sound and gives you a silent sped-up video rather than an error.

The slider stops at 4x, and the tool clamps anything beyond that. To go further, run the output through the tool a second time: 4x then 4x gives you 16x, and 4x then 2x gives 8x.

Expect a slightly softer picture after the second pass, because every run re-encodes the video (H.264 at a standard good-quality setting). For a long recording, it is better to trim the useful part first, then speed it up once or twice, than to speed up the full file twice. Above roughly 8x, audio turns into unintelligible noise, so consider muting the clip and adding music instead.

The same tool slows video down: drag below 1x, down to 0.25x. A 0.5x setting doubles the length. Slowing footage does not invent new frames, so a clip shot at normal frame rate will look choppy at 0.25x. That is a limit of the footage, not of the tool.

If you would rather not use a browser tool, phones and PCs have built-in options: iMovie on iPhone and the Clipchamp editor on Windows 11 both include a speed control. They are fine for one-offs but need an app install or a full editing project. A browser tool is quicker when all you want is one speed change on one file.

Fix the clip's length and framing before you change speed. Remove dead air with [Trim Video](/trim-video), because a trimmed clip processes faster. After speeding up, you may want to combine segments, which our guide on [how to merge videos](/blog/how-to-merge-videos) covers, or shrink the file with [Compress Video](/compress-video) before sharing.

A sped-up clip is also shorter, which helps with upload limits and autoplay previews. Check the result once from start to end before posting: fast motion can make small mistakes in the original footage, like a jolt or a lens smudge, much more noticeable than at normal speed.