Speed up or slow down any video instantly in your browser - no upload needed
A free video speed changer for MP4, MOV, MKV and WebM files. Change video speed either way: speed up a video to build a timelapse or skip the filler in a long recording, or slow down a video for a slow-motion effect. All processing runs locally on your device, so your files are never uploaded.
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🔒 Your files never leave your device - 100% private & secure
A video speed changer normally means picking desktop software, waiting for it to install, and learning yet another timeline editor just to change one setting. VidShift skips all of that. It is a video speed changer that runs entirely as code inside your browser tab, built on WebAssembly and the WebCodecs API - the same browser technology that powers native video playback. When you drop a file on the page, it is decoded, re-encoded at the new playback speed, and muxed back into a video file using your device's own CPU and, where available, its hardware video encoder.
Nothing about that process involves a server. There is no upload step because there is nowhere for the file to be uploaded to: VidShift has no backend that receives or stores media. Your video is read from disk into browser memory, processed there, and written back out as a download - the file never crosses your network connection. That matters for two practical reasons beyond privacy: a two-hour recording that would take several minutes to upload on a slow connection starts processing immediately, and there is no file-size cap imposed by a server-side queue. The trade-off is that processing speed depends on your device rather than a data centre, so very long files on older hardware will take longer than the same job would on a fast server - but for the vast majority of clips people want to speed up or slow down, browser-based processing finishes in well under a minute.
Drop your file onto the page or click Select Video. MP4, MOV, MKV, WebM and other common video formats are supported.
Pick a preset speed from 0.25x to 4x, or type a custom value between 0.1 and 16. Use the live preview and the duration badge to check the new length before processing. You can also choose the output format.
Click Change Speed. The video is re-encoded at the new speed entirely in your browser - nothing is uploaded. When it finishes, download your sped-up or slowed-down video, or hand it straight to another tool.
Changing video speed covers two opposite jobs, and each one solves a different problem. Deciding which direction you need usually comes down to whether you have too much footage or not enough detail.
Set any speed above 1x to speed up a video, and use it whenever a clip is longer than the story it tells. A few common cases:
As a rule of thumb: at 2x a ten-minute clip becomes five minutes; at 4x it becomes two and a half minutes; at 8x it becomes seventy-five seconds.
Set any speed below 1x to slow down a video, which is the right move whenever a moment happens too fast to see clearly at normal speed. Common cases:
At 0.5x a clip runs twice as long, and at 0.25x it runs four times as long as the original.
Changing playback speed changes pitch by default, because the audio track is being read faster or slower along with the video - the same effect as speeding up or slowing down a record. Speed up video and voices sound higher and more compressed; at 2x the shift is noticeable but usually still intelligible, and by 4x speech starts to sound like a chipmunk. Slow down video and the opposite happens: at 0.5x a voice drops in pitch and starts to sound slurred, and at 0.25x it becomes a low, distorted drone.
VidShift re-encodes the audio track alongside the video at whatever speed you choose, so the pitch shift is applied consistently and the audio stays in sync with the picture - there is no separate audio delay to fix afterwards. For most use cases this is exactly what you want: a timelapse with a naturally sped-up soundtrack, or slow motion with a naturally lowered one. If you would rather not have any audio at all - for a silent timelapse overlay, for example, or before adding your own music - mute the video either before or after changing its speed.
Eight preset buttons cover the speeds people reach for most often: 0.25x, 0.5x, 0.75x, 1x, 1.25x, 1.5x, 2x, and 4x. For anything outside that range, the custom speed field accepts any value from 0.1x (ten times slower than normal) up to 16x (sixteen times faster), in steps of 0.1. The duration badge updates live as you adjust the value, so you can see exactly how long the output will be - useful when you are trying to hit a specific target runtime rather than just "faster" or "slower."
As a video speed changer, VidShift accepts MP4, MOV (including Apple ProRes footage from Final Cut, Premiere, and DaVinci Resolve), MKV, and WebM as input, along with OGV, M4V, and MPEG-TS files. You do not need to convert a file to a particular format before changing its speed - upload it as-is and VidShift detects the container and codec automatically. Once the speed change is done, choose MP4, WebM, or MKV as the output format, regardless of what you started with.
Changing speed requires re-encoding the video, so there is an encode-decode cycle involved rather than a lossless container edit - but VidShift encodes at a high bitrate relative to the source, so quality loss is minimal and not something you would typically notice on playback. VidShift does not drop or generate frames: every existing frame keeps its place, and only its timestamp shifts, so the timeline compresses or stretches around the same footage you started with. Speeding a video up compresses that timeline, so on an already low-frame-rate source, motion can jump further between frames at very high multipliers like 8x or 16x. Slowing a video down stretches the same frames over a longer duration rather than generating new ones by interpolation, so slow motion created this way looks like a slowed recording rather than the smoothed, ultra-high-frame-rate slow motion you get from a dedicated high-speed camera.
Drop or select your video file on this page. Choose a speed preset (such as 2x or 4x) or enter a custom speed, then click Change Speed. The processing runs entirely in your browser - no upload, no signup, no cost. When it finishes, click Download to save your sped-up video.
Yes. Select a speed below 1x, such as 0.5x (half speed) or 0.25x (quarter speed). The duration preview will show you how long the resulting video will be. Slowing down a video is great for analysing fast action or creating dramatic slow-motion effects.
The video is re-encoded at high quality when the speed is changed. For most uses, the output is visually very close to the original. No frames are dropped or generated - speeding up a video compresses the same frames into a shorter timeline, while slowing down stretches them over a longer one.
You can set any speed between 0.1x (ten times slower) and 16x (sixteen times faster) using the custom speed input. The preset buttons cover the most common speeds from 0.25x to 4x.
Set the speed to 4x, 8x, or even 16x to create a timelapse effect. Higher speeds compress more time into a shorter clip. For the best timelapse results, you may want to trim the video first to select just the section you want, then speed it up here. You can also extract key frames to create a photo sequence instead of a video timelapse.
The audio pitch changes with the speed - at 2x speed, audio will sound higher-pitched, and at 0.5x it will sound lower. If you do not want the audio, you can mute the video before or after changing the speed.
VidShift supports all common video formats as input: MP4, MOV (including Apple ProRes), MKV, WebM, OGV, M4V, and MPEG-TS. You can output the speed-changed video as MP4, WebM, or MKV.
Yes. When the speed change finishes, the "Ready to do more?" links hand your result straight to the next tool - trim it, compress it, add a watermark and so on - with no download-and-re-upload step in between. The file is handed over through your browser's own local storage and never touches a server, so chaining tools together stays exactly as private as a single conversion.
No. Your files never leave your device. VidShift has no backend servers that receive or store your media. All processing runs locally in your browser using WebAssembly, ensuring complete privacy. The tool even works offline after your first visit.