mp4

File format

About MP4 Files

MP4 Video

Released 2003 By MPEG (ISO/IEC JTC 1)

MP4 is the most universally supported video container format. It typically uses H.264 or H.265 video codecs with AAC audio, providing an excellent balance of quality and file size across all devices and platforms.

Family

Video Files

Extension

.mp4

MIME Type

video/mp4

Can Use As

Input Output

The story

HOW MP4
CAME TO BE.

1991

2003

MP4 — formally MPEG-4 Part 14 — shipped in 2003 as the standard container for MPEG-4 media. It was based on Apple's QuickTime File Format from 1991, which the MPEG committee adopted almost wholesale. The format's flexibility (it can carry any combination of video, audio, subtitles, chapters, and metadata) plus near-universal browser and hardware support made it the default video container of the modern internet.

The vast majority of MP4 files today carry H.264 (AVC) video and AAC audio — a combination chosen for its balance between compression efficiency, decoding complexity, and royalty cost. More recent variants use H.265 (HEVC) or AV1 for better compression, with H.264 retained as the fallback for compatibility.

CURIOSITIES &
TRIVIA.

MP4 is a container — the same .mp4 file could contain H.264, H.265, AV1, or even obscure codecs.

The "moov atom" at the start of an MP4 file is an index of every frame — moving it to the end breaks streaming.

Apple's QuickTime .mov and MP4 share the same underlying ISO Base Media File Format.

The Netflix and YouTube apps on your TV almost certainly deliver H.264-in-MP4 most of the time.

An MP4 file can contain multiple audio tracks, multiple subtitle tracks, and embedded chapters — DVDs in a box.

STRENGTHS &
LIMITATIONS.

Strengths

Universal playback — every browser, phone, TV, game console, and editing suite reads MP4.
Supports modern codecs (H.264, H.265, AV1) with no container changes.
Progressive streaming works with the "moov atom" at the start of the file.
Carries subtitles, chapters, multiple audio tracks, and embedded metadata.
ISO-standardized (ISO/IEC 14496-14) and patent-licensable via MPEG LA.

Limitations

Codec licensing (H.264, H.265) carries royalty costs for commercial use.
Streaming requires the moov atom at the start — a misplaced atom breaks web playback.
Not ideal for lossless or professional editing workflows (use ProRes or DNxHD instead).
Editing an MP4 almost always re-encodes, degrading quality.

Typical Sizes & Weights

Smartphone video (1080p, 1 min)

60–120 MB

4K video (1 min, H.265)

200–400 MB

Streamed movie (90 min, H.264)

1–4 GB

Social clip (15s, H.264, 720p)

3–8 MB

Technical Specifications

MIME type: video/mp4
Container: ISO Base Media File Format (ISO/IEC 14496-12)
Common video codecs: H.264 (AVC), H.265 (HEVC), AV1, VP9
Common audio codecs: AAC, MP3, FLAC, Opus
Max file size: Practically ~16 TB; 2^63 bytes theoretical
Streaming: Supported with faststart (moov atom at front)

CONVERT FROM
MP4

mp4 jpg mp4 png mp4 webp mp4 gif mp4 bmp mp4 mov mp4 mkv mp4 avi mp4 webm mp4 flv mp4 wmv mp4 3gp mp4 mp3 mp4 wav mp4 flac mp4 aac mp4 m4a mp4 ogg mp4 opus mp4 wma mp4 ogv mp4 m4v mp4 ts mp4 dv mp4 m2v mp4 mjpeg mp4 nut mp4 y4m

CONVERT TO
MP4

mov mp4 mkv mp4 avi mp4 webm mp4 flv mp4 wmv mp4 mpeg mp4 3gp mp4 gif mp4 ogv mp4 vob mp4 m4v mp4 ts mp4 m2ts mp4 mts mp4 mpg mp4 asf mp4 dv mp4 f4v mp4 h264 mp4 h265 mp4 m2v mp4 mjpeg mp4 mxf mp4 rm mp4 rmvb mp4 divx mp4 nut mp4 y4m mp4 swf mp4

Common Use Cases

Web video, streaming, social media uploads, mobile video playback.

Popular MP4 conversions

The most-requested destinations when starting from MP4.

MP4 → MOV MP4 → MP3 MP4 → GIF MP4 → WEBM MP4 → MKV MP4 → AVI

Frequently Asked Questions about MP4

Frequently Asked Questions

MP4 (MPEG-4 Part 14) is the most universal video container format, standardized by ISO in 2001. It typically holds H.264 or H.265 video with AAC audio and supports subtitles, chapters, and metadata.

MP4 files play on virtually every device and media player including VLC, Windows Media Player, QuickTime, and all web browsers. Smartphones and smart TVs also support MP4 natively.

MP4 has broader device compatibility and is the standard for streaming and social media. MKV supports more audio tracks, subtitles, and codecs, making it better for archiving movies with multiple languages.