About Video Metadata Viewer
Before you convert, trim or compress a clip it helps to know what you are actually holding: which codec is inside, whether the audio is stereo AAC, how long the file runs and what bitrate it is using. Media players usually hide that information behind submenus, and online checkers ask you to upload files that might be private. This viewer reads it locally instead.
For MP4, MOV and M4V files it parses the ISO base media file format boxes — moov, mvhd, trak, tkhd, mdhd, hdlr and stsd — and maps the four-character codec codes to names such as H.264, H.265, VP9, AV1 and AAC. Other containers fall back to the browser's media engine for duration and frame size, with a clear note that only basic information is available.
What this tool does
Local-only analysis
The file is read directly from your device inside the browser tab; nothing is uploaded and no network request is made.
MP4, MOV and M4V track details
Container brand, duration, overall bitrate and every track's codec, resolution, sample rate and channel count.
Codec names, not just codes
Four-character codes such as avc1, hvc1, vp09, av01 and mp4a are translated to H.264, H.265, VP9, AV1 and AAC.
Large files stay light
The parser reads box headers and the metadata box only, skipping the media data, so multi-gigabyte files open quickly.
Graceful container fallback
WebM, MKV, AVI and other files fall back to the browser's media engine for duration and frame size, with a plain basic-information notice.
Copy or download the report
Every field can be copied as tidy JSON or saved as a .json file for a bug report, a media inventory or a support ticket.
How to use Video Metadata Viewer
- 01
Drop a video file
Choose an MP4, MOV, M4V or other video from your device; analysis starts automatically and nothing is uploaded.
- 02
Wait for the metadata pass
The viewer reads the file's header boxes and shows an analysing state while it works; only metadata is read, not the media data.
- 03
Read the summary cards
Container, duration, overall bitrate and file size are shown first, followed by the video and audio track cards.
- 04
Check every track
The details table lists file, container and track fields; open the track table when a file has more than one video or audio track.
- 05
Copy or download the report
Press Copy JSON or Download .json to keep the result, then use Analyze another file to start over.
How this tool works
- Works with
- Video info
- Processing
- Client-side, in your browser. Nothing is uploaded.
- Maximum size
- No size limit — metadata only
- Requirements
- Chrome, Edge, Firefox or Safari · A local MP4, MOV, M4V or other video file
Limitations worth knowing
- Full track details need an ISO-BMFF container (MP4, MOV, M4V); WebM, MKV, AVI and other formats only report what the browser's media engine can decode, and some decode nothing.
- The metadata box is capped at 16 MB, and a media segment without its initialisation segment has no track information, so both fall back to basic information.
- Overall bitrate is estimated from the whole file size and duration; it is not the stream's declared bitrate and includes container overhead.
- Encrypted or DRM-protected tracks are not decrypted, so codec and audio details may be unavailable.
Privacy and file handling
The video is read directly from your device inside the browser tab. For MP4, MOV and M4V files only the container's metadata boxes are read through file slices and the media data is skipped; other containers are handed to the browser's own media engine for duration and frame size. In both cases nothing is uploaded, stored, logged or shared, and closing the page clears the selected file and the report.
Read the full privacy policy