# MP4 Viewer

Free online MP4 viewer. Play .mp4 videos directly in your browser without uploading — no install, no server processing.

> Canonical page: https://elysiatools.com/en/viewers/mp4

- **Category:** Videos

- **Supported formats:** .mp4

## Overview

This MP4 viewer plays H.264/AAC video directly in your browser. MP4 is by far the most common web video format, used everywhere from phone recordings to streaming. Pick a sample or choose your own .mp4 file to play it instantly with no upload and no plugins.

## When to use

- You received an .mp4 clip and want to watch it without installing a player.
- You need a quick, private preview of a video before sharing or editing it.
- You want to check a phone recording plays correctly in a clean browser player.

## How it works

- Select a built-in sample or choose your own .mp4 file.
- The video is decoded and played by your browser — nothing is uploaded.
- Use the player controls to play, pause, seek and inspect the clip.

## Use cases

- Previewing screen recordings and camera clips.
- Watching downloaded .mp4 files without a desktop player.
- Quickly checking a video on a locked-down machine with no media software.

## Samples

- **AV1 Horizontal Video - 1080p**: AV1 encoded landscape video in 1080p resolution
- **AV1 Portrait Video - 1080p**: AV1 encoded portrait video in 1080p resolution
- **AV1 Horizontal Video - 720p**: AV1 encoded landscape video in 720p resolution
- **AV1 Portrait Video - 720p**: AV1 encoded portrait video in 720p resolution
- **H.264 Horizontal Video - 1080p**: H.264 encoded landscape video in 1080p resolution
- **H.264 Portrait Video - 1080p**: H.264 encoded portrait video in 1080p resolution
- **H.264 Horizontal Video - 720p**: H.264 encoded landscape video in 720p resolution
- **H.264 Portrait Video - 720p**: H.264 encoded portrait video in 720p resolution
- **H.265 Horizontal Video - 1080p**: H.265 encoded landscape video in 1080p resolution
- **H.265 Portrait Video - 1080p**: H.265 encoded portrait video in 1080p resolution
- **H.265 Horizontal Video - 720p**: H.265 encoded landscape video in 720p resolution
- **H.265 Portrait Video - 720p**: H.265 encoded portrait video in 720p resolution
- **Horizontal Video - 1080p**: Landscape orientation video in 1080p resolution
- **Horizontal Video - 720p**: Landscape orientation video in 720p resolution
- **Portrait Video - 1080p**: Portrait orientation video in 1080p resolution
- **Portrait Video - 720p**: Portrait orientation video in 720p resolution

## Frequently asked questions

### Does this viewer support 4K or HDR MP4 files?

Most H.264 and H.265 MP4 files play fine, including 1080p. Very high-bitrate 4K or HDR clips depend on what your browser and GPU can decode.

### Are my MP4 files uploaded anywhere?

No. Files you open from your device stay on your device and are decoded locally. Only the public sample files come from the server.

### Why won't my MP4 play?

MP4 is a container. If the video or audio track inside uses a codec your browser can't decode (for example an obscure audio format), playback may fail even though the file is a valid .mp4.

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