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.
How to use Crop to aspect ratio
- 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 Crop to aspect ratio free? Is there a watermark?
- Yes — Crop to aspect ratio 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. 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.
- Can I control the output?
- Yes — you can adjust aspect ratio, so you decide the balance between file size and quality.