Change the playback speed of your videos without re-uploading them anywhere. Video Speed Changer runs entirely in your browser using ffmpeg.wasm: pick a factor from 0.25x (slow-mo) to 4x (fast-forward), keep the original audio in sync, and export to any format — perfect for tutorials, lectures or highlight clips. Your video never leaves your device.
Your data is processed entirely in your browser. Nothing is uploaded to any server.
Yes, it is free and runs entirely in your browser.
No. Videos are processed locally with ffmpeg.wasm for privacy.
MP4, MOV, WebM, AVI, MKV and more depending on the tool.
No. It works in any modern browser.