Video Speed Changer & Pitch Changer — Slow Down, Speed Up, Transpose
lacuna.fm · Workflow & Planning
Media
5 items
Description
Free audio speed changer and video speed controller with pitch shifter: change speed, shift key ±12 semitones, export WAV. Change the speed and the pitch of any video or audio in your browser — independently. Slow a solo down to 0.25× without it dropping an octave, transpose a backing track up 3 semitones without it speeding up, or push a lecture to 2× and still understand it. Works on the media playing in your tab, and on local files you drop in. WHAT YOU GET • Speed from 0.125× to 8×, pitch preserved — no chipmunk, no slow-motion growl • Key shift up to ±12 semitones, speed untouched • Both at once, controlled separately • Local file mode: process a file and export the result as WAV (up to 20 minutes) • Reopen the popup on a tab you've already adjusted and the sliders show its live values WHAT IT'S FOR • Learning a part by ear — slow the solo down until you can hear every note • Practising along — transpose the track to a key that fits your voice or instrument • Singing — move a backing track into your range without re-recording it • Transcribing — half speed, same pitch, actual note names • Watching faster — 1.5× or 2× without the pitch going cartoonish FREQUENTLY ASKED How do I slow down a song without changing the pitch? Open the extension while the track is playing and drag the speed slider down. Pitch correction is on by default — the tempo changes, the key doesn't. Can I change the key of a song without changing its speed? Yes. The pitch slider moves the key in semitones and leaves the tempo alone. ±12 semitones is a full octave in either direction. Does the pitch shift work on every site? Speed control does. Pitch shifting needs direct access to the audio stream, which DRM-protected and some cross-origin players don't allow — on those the extension tells you pitch is unavailable and speed keeps working. Local files always support both. Can I save the result? Drop a local audio file into the extension and export the processed audio as WAV. Media playing on a webpage is changed for playback only, not re-encoded. Is it free? Yes, and it works without an account.