Speed Changer
Speed up or slow down any audio from 0.25× to 3.0× without changing the pitch. Useful for speeding through lectures, creating lo-fi slowed tracks, or syncing music to a video timeline. Output stays in MP3 or WAV. Traditional playback speed controls shift the pitch along with the tempo, turning a sped-up voice into a chipmunk-like squeak — this tool uses time-stretching instead, so a 1.5× lecture recording still sounds like the same person talking, just faster. Students commonly use it to review long recordings in less time, while creators use the slow end of the range to build the dreamy, half-speed sound popular in lo-fi and ambient remixes. Fine adjustment in 0.05× steps lets you dial in the exact feel you're after.
How it works
- 1
Upload
Upload the audio you want to adjust.
- 2
Set Speed
Use the slider to pick your speed (0.5× to 2.0×).
- 3
Apply
Click [Apply Speed] to transform the clip while maintaining pitch.
- 4
Save
Download in your chosen format.
FAQ
Does pitch change when I change the speed?+
Nope. Speed Changer keeps your pitch locked so the audio sounds natural—perfect for lectures or syncing video.
What speed range is supported?+
From 0.25× (slow-mo) to 3.0× (fast-paced) speed.
Can I make a 'slowed' version of a song?+
Yes, 0.8× works great! For the moody, aesthetic vibe, check out our 'Slowed & Reverbed' tool.
Does the file length change?+
Yes. At 2× speed, your file is half the length. At 0.5×, it doubles.
Good for listening to lectures faster?+
Totally. Export it at 1.5× or 2× and it will play fast in any standard media player.
Does it affect quality?+
We use advanced time-stretching, so it sounds great between 0.5× and 2.0×. Extreme speeds might have minor artifacts.
How do I change only the pitch?+
Use our Pitch Shifter tool instead.
Can I choose the output format?+
Yes, pick MP3 or WAV at export.
How do I sync to a video?+
Calculate your speed based on the video length. E.g., if the original is 60s and your video is 40s, use 1.5× speed.
Can I use this for ASMR?+
Yes, 0.8–0.9× speed adds that signature relaxed, slow-paced feel.
Last updated August 5, 2026