Will the voice sound strange?

By default the pitch is left alone. The sound is cut into short pieces and the overlaps are melted together, adjusting only the spacing. Turn off “keep the voice” and the pitch shifts with the speed, the old-fashioned way.

Can it slow things down as well?

Yes, down to 0.5×. For transcription, or replaying a passage you could not catch, 0.75× is usually the useful one.

The audio is extracted from the video and adjusted. The result comes out as an audio file.

Where does the file get uploaded?

Nowhere. It is handled inside your browser only.

Does speeding it up hurt the quality?

Pull it too far and the seams become audible. Speech takes up to 2× comfortably; music is better with only a small change.

Audio speed

Name: 소리 속도
Author: KarmoLab

Pitch preserved · 0.5×–3× · 0.75× for transcription · no upload

소리 속도

녹음을 빠르게·느리게 만듭니다. 목소리는 그대로 두고 길이만 바꿉니다

소리 파일을 끌어다 놓거나 눌러서 고르세요 — 영상에서 소리만 뽑아도 됩니다

소리는 브라우저 안에서만 다뤄집니다 — 어디에도 올리지 않습니다.

Speeds up or slows down a lecture recording or meeting audio. Playing it faster normally turns the voice into a chipmunk; this keeps the pitch and changes only the length.

How to use it

Choose an audio file
Pick a speed (1.5× · 2×)
Hit Change it and have a listen
Download it

Common questions

Will the voice sound strange?: By default the pitch is left alone. The sound is cut into short pieces and the overlaps are melted together, adjusting only the spacing. Turn off “keep the voice” and the pitch shifts with the speed, the old-fashioned way.
Can it slow things down as well?: Yes, down to 0.5×. For transcription, or replaying a passage you could not catch, 0.75× is usually the useful one.
Do video files work?: The audio is extracted from the video and adjusted. The result comes out as an audio file.
Where does the file get uploaded?: Nowhere. It is handled inside your browser only.
Does speeding it up hurt the quality?: Pull it too far and the seams become audible. Speech takes up to 2× comfortably; music is better with only a small change.

Other tools

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