Is Crop to aspect ratio free? Is there a watermark?

Yes — Crop to aspect ratio is free to use with no sign-up or watermark. Very large files can still be limited by your browser's available memory and processing resources.

Do my files get uploaded to a server?

No. Crop to aspect ratio runs entirely in your browser with WebAssembly, so your MP4, MOV, WebM, MKV file never leaves your device and nothing is stored or seen by us.

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

Crop to aspect ratio accepts MP4, MOV, WebM, MKV and gives you back a MP4 file. You can also set aspect ratio before you run it. Actual codec support depends on what the bundled engine or browser decoder can read.

Can I control the output?

Yes — you can adjust aspect ratio, so you decide the balance between file size and quality.

Free tools · Compress & resize

Crop to aspect ratio

Crop a video to a new aspect ratio — 9:16 for Reels and TikTok, 1:1 for feeds, 4:5, or 16:9 — with a centred crop. All in your browser.

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

Drop a file or click to chooseMP4, MOV, WebM, MKV

Get a better result

Best for: Reframing a centered subject for vertical, square, portrait, widescreen, or 4:3 delivery when losing outer image area is acceptable.
Input → output: Source video becomes a center-cropped H.264 MP4 at the selected aspect ratio, with even output dimensions and AAC audio.
Quality tip: Preview faces, captions, controls, and action near the edges. A centered crop works best when the subject stays near the middle.
Know before running: The crop permanently discards outer pixels and offers no custom focal point, pan, or keyframed tracking. It re-encodes both video and audio into MP4.
Next step: Fade in from black to give the newly framed clip a deliberate opening.

How to use Crop to aspect ratio

1
Choose your file. Drop a supported MP4, MOV, WebM, MKV file into the tool, or click to select one. It stays on your device — nothing is uploaded.
2
Pick your settings. Adjust the available options, then press Run. The first processing run loads the browser engine before conversion begins.
3
Download. Review the result, then download the finished file from your browser with no watermark.

Frequently asked questions

Is Crop to aspect ratio free? Is there a watermark?: Yes — Crop to aspect ratio is free to use with no sign-up or watermark. Very large files can still be limited by your browser's available memory and processing resources.
Do my files get uploaded to a server?: No. Crop to aspect ratio runs entirely in your browser with WebAssembly, so your MP4, MOV, WebM, MKV file never leaves your device and nothing is stored or seen by us.
What can I put in, and what do I get out?: Crop to aspect ratio accepts MP4, MOV, WebM, MKV and gives you back a MP4 file. You can also set aspect ratio before you run it. Actual codec support depends on what the bundled engine or browser decoder can read.
Can I control the output?: Yes — you can adjust aspect ratio, so you decide the balance between file size and quality.