TikTok video editor online, 9:16, captions, no upload

Ship vertical TikToks faster without installing an app or uploading drafts to a cloud editor. Supercut reframes, captions, and exports locally.

Open the editor, freeNo upload · No sign-up to start · 100% private

Just type

Optimize this for TikTok with captions

Works with

MP4MOVWebM

How it works

  1. 1

    Drop your clip

    Load horizontal or square footage, it stays on your device.

  2. 2

    Ask for TikTok format

    Say “crop 9:16 for TikTok” and “add bold captions.” Supercut handles reframe and subtitles locally.

  3. 3

    Export TikTok-ready

    Download a vertical, captioned cut ready to upload to TikTok from your phone or desktop.

Tips

  • 1080x1920 (9:16) is the native TikTok size.
  • Add bold captions, many people watch with sound off.
  • Add trending audio inside TikTok after export.

Why it stays private

Supercut decodes, edits and exports your video entirely in your browser with WebAssembly. Your footage is never uploaded, the only thing that leaves your device is the text of your prompt, so the AI knows what edit to plan. Read more in our Privacy Policy.

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Who uses this

Frequently asked questions

What size are TikTok videos?

1080×1920 (9:16 vertical) is standard. Supercut reframes to that aspect automatically.

Can Supercut follow faces when cropping?

Yes. Smart reframe keeps subjects centered while converting to vertical.

Do I upload to Supercut?

No. Editing runs in your browser. Only your text prompt is sent so the AI knows what to do.

Ready to try it?

Drop a clip and describe the edit, it runs right here in your browser.

Open the editor