Tempo & Pitch
Changes playback speed without shifting pitch, or transposes pitch without changing length.
Drop audio to change its speed
Keep the pitch with a phase vocoder, or resample and let it shift — both are offered because both are honest, in different ways.
The file is read in this tab and never uploaded anywhere.
Feed it from
Speed Changer
Speeds up or slows down a video from 0.25× to 4×. The picture is retimed frame-exact; the audio keeps its pitch through WSOLA time-stretching, or can follow the speed tape-style, or be muted.
BPM Detector
Estimates a track’s tempo in BPM by onset autocorrelation, with a confidence score and alternative candidates.
Video Editor
Assembles clips into a YouTube or Shorts upload in the browser: trim, order, transitions, a music bed and subtitles. Same-batch AI clips with hard cuts export losslessly without re-encoding.
Video Trimmer
Cuts a clip between two timestamps, copying streams without re-encoding when the cut is on a keyframe.
Next
These accept what this tool produces, so the result can go straight in.
BPM Detector
Estimates a track’s tempo in BPM by onset autocorrelation, with a confidence score and alternative candidates.
Audio Converter
Converts between MP3, WAV, FLAC, AAC, OGG and Opus with bitrate and sample-rate settings.
Audio Trimmer
Cuts a section out of an audio file on the waveform, with fade in and fade out.
Extract Audio from Video
Pulls the audio track out of a video as MP3, WAV, M4A or FLAC, or copies it without re-encoding.
Burn Subtitles
Renders an SRT, VTT, ASS or SMI file permanently into the video frames with size, position, colour and outline control, drawn with the browser’s own fonts so Korean needs nothing extra.
Video Compressor
Re-encodes to a target file size or a quality preset, stepping the resolution down when the bitrate would starve it, and shows the projected size before it starts and the actual size after.