# What is an MP4 (MPEG-4) file?

MP4 is a multimedia container format (MPEG-4 Part 14) that commonly stores video and audio in a widely compatible file type.

Canonical URL: https://www.subclip.app/faq/what-is-an-mp4-file

Last modified: 2026-04-17T00:00:00+00:00

**Definition**
MP4 is a multimedia container standard (ISO/IEC 14496-14) that can hold video, audio, subtitles, chapters, and metadata in one file.

**Who made it and why**
MP4 comes from ISO/IEC MPEG work, based on the QuickTime format foundation, to create an interoperable internet-ready container across devices and platforms.

**Why it became dominant**
- Broad cross-platform compatibility
- Strong quality vs file-size efficiency
- Wide hardware acceleration support
- Native acceptance in web and social pipelines

**Use it in Subclip**
Open MP4 in [Subclip Home Player](https://subclip.app/home), edit in [AI Video Editor](/tools/ai-video-editor), generate transcripts in [Transcript Generator](/tools/transcript-generator), and convert in [Convert Video Format](/tools/convert-video-format).

**History and adoption**
MPEG-4 Part 14 was published in 2003 and became the default distribution container as smartphones and HTML5 video scaled.

**TL;DR**
MP4 is the safest default video container for compatibility.

**Related converters**
[MP4 to MOV](/tools/convert-video-format/mp4-to-mov), [MP4 to MKV](/tools/convert-video-format/mp4-to-mkv), [MP4 to WebM](/tools/convert-video-format/mp4-to-webm), [MP4 to MP3](/tools/convert-video-format/mp4-to-mp3), [GIF to MP4](/tools/convert-video-format/gif-to-mp4).

**Related FAQs**
[How do I open an MP4 file?](/faq/how-to-open-an-mp4-file), [What is an MOV file?](/faq/what-is-a-mov-file), [How do I open an MOV file?](/faq/how-to-open-a-mov-file), [What is a GIF file?](/faq/what-is-a-gif-file).

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