Change the playback speed of your video and audio files without losing quality.
Supports MP3, WAV, M4A, FLAC and OGG audio, plus MP4, MOV and MKV video (up to 2GB)
Select a video or audio file, choose a speed with the slider, a preset or by typing a value, then click the Change Speed button. You can preview the first 15 seconds before processing the whole file.
Anything from 0.25x (four times slower) to 4x (four times faster), in steps of 0.05x. Presets are included for 0.5x, 0.75x, 1.5x and 2x.
No. The audio tempo is adjusted without changing its pitch, so voices don't sound like chipmunks when sped up or unnaturally deep when slowed down.
Yes. MP3, WAV, M4A, AAC, FLAC and OGG files can be sped up or slowed down, and they are saved in their original format.
Changing a video's speed means re-encoding it, so there may be a slight loss in quality, but the resolution stays the same. Audio is saved at 192 kbps for MP3, AAC and OGG, and without compression loss for WAV and FLAC.
No. The speed change happens entirely in your browser, so your files never leave your device.