Is Change video speed free? Is there a watermark?

Yes — Change video speed is completely free, with no sign-up, no watermark, and no limit on how many files you process.

Do my files get uploaded to a server?

No. Change video speed runs entirely in your browser with WebAssembly, so your MP4, MOV, WebM (with audio) file never leaves your device and nothing is stored or seen by us.

What can I put in, and what do I get out?

Change video speed accepts MP4, MOV, WebM (with audio) and gives you back a MP4 file. You can also set speed before you run it.

Does Change video speed change my original file?

No. It never touches your original — Change video speed creates a brand-new MP4 file to download and leaves the source on your device untouched.

Free tools · Edit

Change video speed

Make a video faster or slower — 0.5× to 2× — with the audio kept in sync. Great for time-lapses or slow-motion. Browser-only, no upload.

Runs entirely in your browser. Your file is never uploaded — no watermark, no account.

Drop a file or click to chooseMP4, MOV, WebM (with audio)

How to use Change video speed

1
Choose your file. Drop a file into the tool, or click to select one. It stays on your device — nothing is uploaded.
2
Pick your settings. Adjust the options if you like, then press Run. The first run downloads a ~32 MB engine once; after that it's instant.
3
Download. Everything is processed right in your browser — download the finished file instantly, with no watermark.

Frequently asked questions

Is Change video speed free? Is there a watermark?: Yes — Change video speed is completely free, with no sign-up, no watermark, and no limit on how many files you process.
Do my files get uploaded to a server?: No. Change video speed runs entirely in your browser with WebAssembly, so your MP4, MOV, WebM (with audio) file never leaves your device and nothing is stored or seen by us.
What can I put in, and what do I get out?: Change video speed accepts MP4, MOV, WebM (with audio) and gives you back a MP4 file. You can also set speed before you run it.
Does Change video speed change my original file?: No. It never touches your original — Change video speed creates a brand-new MP4 file to download and leaves the source on your device untouched.