---
title: "Convert a video to MP4, WebM or MOV, free, no upload | Kuro"
description: "Convert MOV, WebM and MKV to MP4, or MP4 to WebM or MOV, free and with no upload. Video that already fits the new format is copied, not re-encoded."
canonical_url: "https://meetkuro.com/tools/convert-video/"
locale: "en"
tool: "convert-video"
---

# Convert a video

Drop a MOV, WebM, MKV or MP4 and pick MP4, WebM or MOV. When the video inside already fits the new format, it's copied as it is, so it takes seconds and loses nothing.

Your file never leaves this device. Everything runs in your browser.

[Convert a video](https://meetkuro.com/tools/convert-video/)

## Made for

- [MOV to MP4](https://meetkuro.com/tools/convert-video/mov-to-mp4/)
- [WebM to MP4](https://meetkuro.com/tools/convert-video/webm-to-mp4/)
- [MKV to MP4](https://meetkuro.com/tools/convert-video/mkv-to-mp4/)
- [MP4 to WebM](https://meetkuro.com/tools/convert-video/mp4-to-webm/)

## How it works

1. Drop your video.
2. Pick the format you need. The tool says which parts it copies and which it re-encodes.
3. Press Convert and download the new file.

## Questions

### Which formats can I convert to?

MP4 and MOV with H.264 video and AAC sound, and WebM with VP9 video and Opus sound: the formats a browser can write. AVI, FLV and WMV aren't offered, because no browser can make them.

### Does converting lose quality?

Not when the video is copied: a MOV or MKV holding H.264 becomes an MP4 without its picture being touched. When the codec has to change, the video is re-encoded at high quality, and like any re-encode it isn't bit-for-bit the original.

### Is there a length limit?

Files up to 2 GB. A conversion that copies the video has no length limit; one that re-encodes it takes videos up to 15 minutes.

### What happens to subtitles and extra audio tracks?

The new file gets the main video and the main sound. Subtitle tracks and extra languages, which an MKV often carries, are left out.

### Does my video get uploaded?

No. It's converted in your browser, on your device.

### Which browsers does it work in?

Current Chrome, Edge, Safari and Firefox. Re-encoding to MP4 or MOV needs a browser that can encode H.264, which Chrome, Edge and Safari can. Making a WebM needs VP9 and Opus encoders, which Chrome and Edge have. If yours can't, the tool says so before it starts.

## Kuro

In Kuro you make the next clip from a few words or a picture, vertical and ready to post.

[Make your next clip in Kuro](https://app.meetkuro.com/create?type=shorts&utm_source=tools&utm_medium=tool&utm_campaign=convert-video) — Kuro opens the clip composer.

## More free tools

- [Compress a video](https://meetkuro.com/tools/compress-video.md): Make a video small enough for Discord, email or WhatsApp.
- [Resize a video](https://meetkuro.com/tools/resize-video.md): Turn a video into 9:16 for TikTok, Reels and Shorts, or 4:5, 1:1 or 16:9.
- [Crop a video](https://meetkuro.com/tools/crop-video.md): Cut a video down to the part you want to keep, at its own size.
- [Rotate a video](https://meetkuro.com/tools/rotate-video.md): Turn a video the right way up, or mirror it.
- [Safe-zone checker](https://meetkuro.com/tools/safe-zone-checker.md): See where TikTok, Reels and Shorts will cover your video before you post.
- [Trim a video](https://meetkuro.com/tools/trim-video.md): Cut a video down to the part you want, in seconds.

---

## About Kuro

Kuro is an AI picture studio: prompt-driven images, clips, voice-overs and music, and storyboard-backed films with consistent characters across every scene.

Agents connect over MCP and can generate directly:

```
claude mcp add kuro https://api.meetkuro.com/mcp --transport http
```

The app is at https://app.meetkuro.com and requires an account.

Each guide, model page, comparison and free tool page on this site (not a tool's variants, and not the index pages) has a Markdown twin at its own URL plus `.md`, and so do /benchmarks/, the English /agents/ page (as /agents.md) and the MCP tool reference. Free video tools: https://meetkuro.com/tools/