---
title: "Convert Video to MP4 Online Free, No Upload | ToolSugar"
description: "Convert MOV, WebM, MKV, AVI and M4V videos to MP4 in your browser. Compatible streams are copied in seconds, and the rest are re-encoded to H.264."
canonical: https://toolsugar.com/tools/video-converter
image: https://toolsugar.com/og.png
---

# Convert any video to MP4

Choose a video and the tool reads which codecs it uses. H.264 video and AAC or MP3 audio move into MP4 unchanged, usually in seconds and with no quality loss. Anything else, such as VP9, HEVC or Opus, is re-encoded on your device, which is much slower. The result tells you exactly which one happened.

Runs on your device

## How it works

1. Choose a MOV, WebM, MKV, AVI or M4V file.
2. Leave the method on Copy when possible, unless a player rejects the result.
3. Press Convert to MP4 and keep the tab open.
4. Read what was copied or re-encoded, then download the MP4.

## Key facts

- **Inputs**: MOV, WebM, MKV, AVI, M4V and most other video files
- **Output**: MP4 with H.264 video and AAC or MP3 audio
- **File limit when copying**: 500 MB on a computer, 250 MB on a phone
- **File limit when re-encoding**: 120 MB on a computer, 60 MB on a phone
- **Tracks kept**: The first video and first audio track
- **Your file**: Processed inside this tab and never uploaded

## Common uses

- Open a video on a device or an app that only accepts MP4.
- Prepare a recording for an editor or a learning platform that rejects its format.
- Fix a video that plays with no picture because of its codec.
- Move old AVI home videos to a format every phone can play.

## Questions

### Why did it finish in a few seconds? Did it really convert?

Yes. MP4 is a container, and your video and audio streams were already in formats it holds, so they moved across unchanged. No frames were re-encoded, which is why it was quick and lost no quality.

### When should I use Always re-encode?

Use it when the copied MP4 still fails in a strict player, for example because the source is 10 bit or uses an unusual H.264 profile. It rebuilds the video as standard 8 bit H.264, which takes much longer.

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

Only the first video and first audio track are kept. Subtitles and additional language tracks are dropped, because most MP4 players cannot use the subtitle formats found in other containers.

### Is my video uploaded anywhere?

No. The video engine runs inside your browser tab and reads the file from your device. ToolSugar's servers never receive it, and closing the tab clears the working copy from memory.

[Read the Convert to MP4 guide](https://toolsugar.com/blog/how-to-convert-a-video-to-mp4)

## Related tools

- [MOV to MP4](https://toolsugar.com/tools/mov-to-mp4)
- [WebM to MP4](https://toolsugar.com/tools/webm-to-mp4)
- [MKV to MP4](https://toolsugar.com/tools/mkv-to-mp4)
- [Compress Video](https://toolsugar.com/tools/video-compressor)