Change video playback speed using FFmpeg setpts and atempo filters, making the video faster or slower while adjusting both video timing and audio pitch for natural-sounding results
Our free video speed changer lets you speed up or slow down any clip in a couple of steps, so it moves exactly the way you want. Upload your video, choose whether to make it faster or slower, and download an MP4 that plays back at the new pace. It runs on the professional FFmpeg engine, using the setpts filter to retime the picture and the atempo filter to retime the sound, so the audio keeps up without turning into a chipmunk squeak or a slow, muddy growl. Whether you want to speed up a video to fit a time limit, build a quick timelapse, or slow down a video to study a moment in detail, this tool handles both directions. It is completely free to use, with no watermark on your video.
Changing the speed of a video with File Tools Online takes a few quick steps, and you do not need iMovie, Premiere, or any desktop editor. Everything runs online in your browser.
Drag and drop your clip into the box above, or click to browse and pick the file from your device. MP4, MOV, and AVI files are all accepted.
Choose whether to make the video faster or slower. The tool retimes both the picture and the sound so playback stays smooth and the audio still sounds like the original voice.
Download the finished MP4 and use it anywhere. Your file is processed securely and deleted automatically within 30 minutes.
The result is a single MP4 that plays at the new speed on any device. The picture and the audio move together, so a sped-up clip does not drift out of sync and a slowed-down clip keeps its sound lined up with the action on screen.
Plenty of "speed up video" sites bury you in ads, add a watermark, or hand back a clip where the audio has turned into a high-pitched squeal. Ours uses FFmpeg, the same professional engine trusted inside major video software, to retime the video and the audio together, so your clip plays at the pace you chose and still sounds natural.
One tool covers both directions. Speed a clip up to condense it, or slow it down to draw out a moment, without switching to another editor.
The atempo filter retimes the sound to match the new speed while keeping the pitch, so voices do not turn into chipmunk squeaks or low growls.
Powered by FFmpeg, the professional-grade tool behind countless media apps, so your speed change is accurate and the picture stays clean.
Change video speed free online with no watermark stamped across your footage and no low-quality export.
Files are processed securely over an encrypted connection and automatically deleted within 30 minutes of upload.
Runs online on Windows, Mac, Linux, Chromebook, Android, and iPhone. Nothing to download and nothing to install.
Changing the speed of a video means changing how quickly its frames and its audio play back. This tool does that with two well-known FFmpeg filters working together. The setpts filter adjusts the presentation timestamps of the video frames, which is the instruction that tells a player how long each frame stays on screen. Stretch those timestamps and the video plays slower; compress them and it plays faster. Because setpts works on the timing of the frames you already have, the picture itself is untouched, so a sped-up or slowed-down clip keeps the same sharpness as the original.
Sound is the part most free tools get wrong. If you simply play audio faster, every voice jumps up in pitch and turns into a chipmunk squeak; play it slower and it drops into a deep growl. This tool avoids that with the atempo filter, which changes the tempo of the audio while holding the pitch steady. The two filters are matched to the same speed, so the retimed sound stays lined up with the retimed picture from the first frame to the last. The result is a clip that moves at your chosen pace with audio that still sounds like the original recording, not a cartoon version of it. This is a genuine playback-speed change, not AI frame generation, so the tool works with the frames in your file rather than inventing new ones.
Speeding a clip up or slowing it down solves a lot of everyday problems, both for creators and for anyone who just needs a video to fit or to be easier to follow. Here are the ones people reach for most often.
File Tools Online offers more than 100 free tools to convert, edit, and manage your files. These are the ones people use most alongside the video speed changer.
The tool works the same way in both directions, but the reason you reach for it and the way the finished clip feels are quite different. This quick comparison shows what each choice does to your video.
| Aspect | Speed up a video | Slow down a video |
|---|---|---|
| What it does | Compresses the frame timing so the clip plays faster and finishes sooner. | Stretches the frame timing so the clip plays slower and lasts longer. |
| Runtime | Shorter than the original. | Longer than the original. |
| Audio | Retimed faster while the pitch is held, so voices do not squeak. | Retimed slower while the pitch is held, so voices do not growl. |
| Best for | Timelapse, condensing tutorials, quick recaps, fitting a time limit. | Emphasising a moment, study and analysis, a slow, deliberate feel. |
| Output | A single MP4 at the new, faster pace. | A single MP4 at the new, slower pace. |
Whichever direction you choose, the picture and the sound are retimed by the same amount, so your clip stays in sync and downloads as one clean MP4.
You do not need a full editing suite just to change how fast a clip plays. Desktop editors like Premiere Pro, Final Cut, and DaVinci Resolve can retime video, but they are large downloads, some cost money, and importing a single clip only to change its speed and export it again is a lot of steps for a small job. iMovie and the built-in phone editors can do it too, but they are tied to one device and often re-encode with a watermark or their own limits.
This online video speed changer runs the same kind of retiming that professional software does, using FFmpeg on our servers, and gives you back a standard MP4. There is no program to buy, no timeline to learn, and nothing to install. You upload one clip, pick faster or slower, and download the result, which makes it a practical free alternative when changing playback speed is all you actually need to do.
This change video speed tool accepts the most common video formats and always returns a single, standard MP4 that plays everywhere. Supported inputs include:
Whichever of these you upload, the output is the same dependable MP4, retimed to your chosen speed and ready to play on any device. If your clip is in another format, run it through our Video Convert tool first to turn it into an MP4, then change its speed here.
Because this is an online video speed changer, it works the same on every device. There is no program to install on Windows, no app to download on Mac, and nothing to add to your phone, you use the exact same page whether you are on a laptop, a Chromebook, an Android device, or an iPhone.
That makes it easy to speed up a video on your phone before posting it, to slow down a video on Mac for a closer look, or to retime a clip on a work computer where you cannot install software. The processing runs on our servers with FFmpeg, so even a longer clip is retimed reliably no matter how powerful your own device is. All you need is a browser and an internet connection.
Yes. The videos people retime are often personal recordings, work projects, and clips they have not published yet, so security is built in. Files are uploaded over an encrypted HTTPS connection, processed on a secure server, and automatically deleted within 30 minutes. We never share, sell, or reuse your videos.
Upload your clip to the tool above and choose to make it faster. The tool uses FFmpeg to compress the video timing and retime the audio to match, then lets you download the sped-up MP4. The whole process runs online in your browser, with nothing to install.
Upload your clip and choose to make it slower. The tool stretches the frame timing so the video plays back slower and retimes the sound to keep pace, then gives you a slowed-down MP4 to download.
Yes. The File Tools Online video speed changer is free to use, with no watermark added to your footage. You upload the video, change its speed, and download the result.
No. The tool uses the atempo filter to change the tempo of the audio while keeping the pitch, so a sped-up clip does not squeak and a slowed-down clip does not growl. Voices still sound like the original recording.
Yes. The picture and the sound are retimed by the same amount, so the audio stays lined up with the action from the first frame to the last, whether you speed the clip up or slow it down.
Changing the speed retimes the frames you already have rather than altering the picture itself, so a sped-up or slowed-down clip keeps the same sharpness as the original. The output is a standard MP4 that plays on any device.
Yes. Speeding a long recording up is a simple way to create a timelapse-style clip. For very long footage, trim it to the part you want first, then speed it up so the finished clip is short and to the point.
No. This is a genuine playback-speed change, so it retimes the existing frames rather than generating new ones. It gives a slowed clip a slow, deliberate feel by stretching the timing of the frames in your file.
The tool accepts MP4, MOV, and AVI files and always returns an MP4. If your clip is in another format, convert it to MP4 with our Video Convert tool first, then change its speed here.
Open this page in your browser on your phone, upload the video, choose faster or slower, and download the result. It works the same on Android and iPhone, with no separate app to install.
Everyday clips are retimed without any hassle. A slowed-down video runs longer and can be larger, and very long files may take a little longer to process, but the tool is built to handle the videos most people need to change.
Yes. Files are transferred over an encrypted connection, processed securely, and automatically deleted within 30 minutes. We never share or sell your videos.
Playback speed is one of the most useful things you can change about a video, because it changes how the whole clip feels. Speed a video up and a long, slow recording becomes a punchy timelapse or a quick recap that respects the viewer's time. Slow a video down and a fleeting second becomes something you can actually watch, study, and appreciate. The same footage can serve two very different purposes depending only on the pace you give it, which is why a good video speed changer is a tool people keep coming back to.
The catch has always been the sound. Change the speed carelessly and the audio betrays it instantly, jumping into a squeak when you speed up or sinking into a growl when you slow down. This free online tool solves that with FFmpeg: the setpts filter retimes the picture while the atempo filter retimes the sound and holds its pitch, so both stay in step and the audio still sounds natural. Upload your clip, choose faster or slower, and download a clean MP4 at the new pace. It is free to use, with no watermark and no software to install, ready to play, share, or upload anywhere.