Speed up or slow down any video from 0.25× to 4× — and decide what the sound does: keep the original pitch, let it rise and fall with the speed, or shift it to any key. No upload, no watermark.
100% in your browser - your files never leave your device.
MP4, MOV, WebM, MKV or M4V from your phone, camera or screen recorder. The file is opened inside your browser — nothing is uploaded, so even large clips load instantly.
Drag the slider anywhere from 0.25× (four times slower) to 4× (four times faster), or tap a preset: 0.5× slow motion, 1.5× and 2× for tutorials and lectures.
Keep original pitch so voices and music stay natural at any speed; Pitch follows speed for the classic tape / vinyl effect (sped-up or slowed + deep); or Custom pitch to time-stretch and transpose by up to ±12 semitones at the same time. Preview plays exactly what you will export.
The picture is re-timed without re-encoding, so there is zero quality loss and the export takes seconds. You get an MP4 (or WebM for VP8/VP9 sources) with the processed soundtrack and no watermark.
Most video speed changers simply play the soundtrack faster or slower. That works for the picture, but it drags the audio pitch along with it: at 2× every voice turns into a chipmunk, at 0.5× it becomes a slow, deep drone. This tool runs the soundtrack through the same time-stretching engine as the TuttiDAW music studio, so the audio is re-synthesized at the new length while its pitch stays exactly where it was.
Sometimes the pitch change is the point. Pick "Pitch follows speed" and the audio is resampled like a tape or turntable — the sound behind sped-up nightcore edits and slowed + reverb videos. Or choose "Custom pitch" to set speed and key independently: slow a performance down for practice while raising it a semitone to match your instrument, or speed a clip up while dropping the voice for a deeper narration.
Only the soundtrack is processed. Video frames are copied straight into the new file with their timestamps scaled, so there is no generational quality loss, no resizing and no watermark — a 2× clip has every original frame, just shown twice as fast.
Speed up lectures, courses, meetings and tutorials to 1.5× or 2× and keep the speaker's natural voice — save the file once and watch it on any device or player, even ones without a speed button.
Slow down dance, sports, cooking or instrument videos to 0.5× or 0.75× to study every move, with the music still in tune so you can play or dance along at practice tempo.
Make content for TikTok, Reels and Shorts: fit a clip to a time limit with a subtle 1.1×, create sped-up or slowed song edits with the tape-style pitch mode, or turn footage into dramatic slow motion.
Yes — that is the default "Keep original pitch" mode. The soundtrack is time-stretched, not resampled, so at 0.5× or 2× voices and music stay in exactly the same key as the original.
Choose "Pitch follows speed". The audio is then resampled like a tape or vinyl record: 2× plays an octave higher, 0.5× an octave lower — the classic nightcore / slowed effect. "Custom pitch" lets you set any shift from −12 to +12 semitones regardless of speed.
No. The video stream is not re-encoded — every frame is copied unchanged and only its timing is rescaled, so resolution, sharpness and colors are identical to your original. Only the audio track is re-encoded (high-quality AAC or Opus).
MP4, MOV, M4V, WebM and MKV with common codecs (H.264, H.265/HEVC, VP8, VP9, AV1), depending on what your browser supports. The result is saved as MP4, or as WebM when the source codec can't be stored in MP4.
No. Opening, processing and saving all happen inside this page on your own device, so private recordings never leave your computer or phone. Videos up to 15 minutes long are supported.
From 0.25× (four times slower) to 4× (four times faster), with fine steps in between and one-click presets for 0.5×, 0.75×, 1.25×, 1.5×, 2× and 3×. Speech stays clear up to about 2×; music sounds most natural between 0.7× and 1.4×.
Want to edit the soundtrack itself — cut, layer music, add effects? TuttiDAW is a full music studio, free in your browser.
Explore TuttiDAW - the online audio workstation, no sign-up to start