Speed a video up or slow it down from 0.25× to 4× in your browser, keeping voices at their natural pitch or letting them change, with a live preview and no upload.
Check supported input/output details and follow the tool steps before exporting.
Use these specs to confirm browser fit, privacy boundaries, and export behavior before you change video speed.
Cost
Free, with no signup.
Security
Changing the speed runs in your browser; the video is not uploaded to ToolBuddy.
Input
MP4, MOV, WebM, or MKV video, up to 2 GB on desktop and 250 MB on mobile.
Output
MP4 (H.264, AAC) where supported, otherwise WebM.
Speeds
0.25× to 4×, with or without keeping the pitch, or muted.
Check supported input/output details and follow the tool steps before exporting.
01
Select or drop a video, or try the sample.
02
Pick a speed, or set any speed from 0.25× to 4× with the slider.
03
Choose whether voices keep their pitch, or mute the sound.
04
Save the video, then download it or open it in another tool.
Understand how to change a video's speed in the browser, why it matters in repeat workflows, and when to use this tool with confidence.
With keep pitch on, the sound is time-stretched so voices stay natural; off, the pitch follows the speed like a tape.
The preview plays at the chosen speed with the same pitch setting, and the new length is shown before you save.
Decoding and encoding run in your browser. Slow motion repeats frames rather than inventing new ones.
Have more questions? Reach out via our contact page and we will respond within 24 hours.
No. It is read, changed and saved in your browser, and the file never leaves your device.
The sound is stretched or squeezed in time without changing its pitch, so voices sound natural at the new speed. Turn it off for a tape-like effect.
Any speed from 0.25× (four times slower) to 4× (four times faster).
No. Each frame is shown for longer, at the video's own frame rate, so very slow speeds look steppy on fast motion.
MP4 (H.264, AAC) where your browser can encode it, otherwise WebM.
See real workflows where this tool fits naturally, then jump straight into the matching guide.
Video Trimmer
Continue from Video Speed Changer into video trimmer for the next step in the workflow.
Open workflow
Video to GIF
Continue from Video Speed Changer into video to gif for the next step in the workflow.
Open workflow
Add Music to Video
Continue from Video Speed Changer into add music to video for the next step in the workflow.
Open workflow
Read intent-focused guides, then jump straight into the live tool workflow.
Trim MP4, MOV, WebM, or MKV video locally on a thumbnail timeline: keep one part or several, cut out a section, or split it into equal parts, with a lossless fast cut or a frame-accurate precise cut.
Turn part of a video into an animated GIF or WebP locally, with crop, speed, reverse or boomerang, colour count, a caption, a size estimate, and a size to fit under.
Add music to a video in your browser: replace its sound, mix the music under it, lower the music while people talk, or just mute the video, with volume, looping and a fade out.
Compress MP4, MOV, WebM, or MKV video locally to a target size or a quality level, with size presets, HEVC or AV1 where your browser supports them, and resolution, frame-rate, and audio options.
Video Speed Changer
Speed a video up or slow it down from 0.25× to 4× in your browser, keeping voices at their natural pitch or letting them change, with a live preview and no upload.
Why ToolBuddy?
Private & Secure — Files stay on your device
Files stay on your device while you work.
Fast Browser-Based Processing
Processing happens locally in your browser for quick results.
No Uploads, No Data Stored
Nothing is uploaded to or stored on our servers.
Free Tools — No Account Required
Use the tool for free with no account or app install.
