Is Resize video free? Is there a watermark?

Yes — Resize video 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. Resize video 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?

Resize video accepts MP4, MOV, WebM, MKV and gives you back a MP4 file. You can also set resolution 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 resolution, so you decide the balance between file size and quality.

Free tools · Compress & resize

Resize video

Resize a video to a standard resolution — 1080p, 720p, 480p, or 360p — keeping the aspect ratio. Browser-only, no upload, no watermark.

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: Standardizing delivery height to 1080p, 720p, 480p, or 360p while retaining the source aspect ratio.
Input → output: The video becomes H.264 MP4 at the chosen height with an automatically calculated even width and 128 kbps AAC audio.
Quality tip: Choose a height at or below the source unless intentional upscaling is acceptable. Downscaling often saves more than increasing compression alone.
Know before running: This operation does not crop or add bars. Selecting a height above the original enlarges pixels without creating real detail, and the H.264 encode is lossy.
Next step: Crop to aspect ratio when the resized frame also needs a different composition.

How to use Resize video

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 Resize video free? Is there a watermark?: Yes — Resize video 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. Resize video 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?: Resize video accepts MP4, MOV, WebM, MKV and gives you back a MP4 file. You can also set resolution 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 resolution, so you decide the balance between file size and quality.