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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MP4 Viewer

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

.mp4

Horizontal Video - 1080p

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Tool usage guide

About this file format

MP4 (.mp4), formally ISO/IEC 14496-14, is a media container based on Apple's QuickTime format. It most often holds H.264 or H.265 video with AAC audio, which every modern browser can play natively. Its near-universal support and good quality-to-size ratio made it the default video format for the web, phones and most streaming pipelines.

MP4 Viewer

About this file format

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MP4 Viewer

Overview

When to use

How it works

Use cases

FAQ

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