Video Details (Metadata Viewer)
See what a video file holds: codec, resolution, aspect ratio, frame rate, bitrate, rotation, audio tracks and when it was recorded. Read in your browser.
Drag a file here, paste it, or choose one. Up to 20000 MB. It stays on your device.
Only the parts of the file that describe it are read, in this tab. The video is never uploaded.
How is this calculated?
Read from the MP4 boxes (ISO/IEC 14496-12): mvhd for length and creation time, tkhd for size and rotation, mdhd for timescale and language, stsd for the codec, stts for frame count and stsz for size. Frame rate = frames ÷ length; bitrate = bytes × 8 ÷ length.Runs in your browser — nothing you enter leaves this device.
About this tool
What it does
Video Details shows what a video file holds, without uploading it. For MP4 and MOV files — what phones, cameras, screen recorders and most editors make — it reads the file’s own index and lists each track: the video codec (H.264, H.265/HEVC, AV1, VP9, ProRes…), the picture size with its aspect ratio and common name (720p, 1080p, 4K), the rotation a phone stored (a portrait phone video is often saved landscape and turned 90° by the player), the frame rate (with 29.97 and 23.976 named for what they are), the average bitrate, and for audio the codec, sample rate, channels and language. It also shows the creation time the camera or app wrote, the overall bitrate, and whether the file is set up to start playing while it downloads. For WebM, MKV and other files it shows what the browser reports when it can play them: length and picture size. Use it to check a file meets an upload requirement, find why a video will not play (often an HEVC file on a browser without HEVC), or see what settings a recording was made with.
How to use it
- Choose or drop a video file.
- Read the file details, then each track’s.
- Play it in the preview to check it is the right file.
Limits and your data
- Full track details are read from MP4, M4V and MOV files; WebM and MKV show length and size only.
- The creation date is whatever the device wrote; some apps write none, or the time of export.
- Frame rate is the average: variable-rate phone video may vary around it.
- Bitrate is the average over the file, not the peak.
- Only the parts of the file that describe it are read, in this browser tab. The video is never uploaded.
Questions
How do I find the codec of a video?
Open the file here; the codec is the first line of the video track, such as H.264 (AVC) or H.265 (HEVC).
Why does a portrait video show as 1920 × 1080 rotated 90°?
Phones often store the picture landscape and add a note to turn it. The page shows both the stored size and how it plays.
Why will my video not play in the browser?
Usually the codec: H.265/HEVC plays only where the device supports it, and ProRes rarely in browsers. The details are still read.
What does “streams quickly” mean?
The index is at the start of the file, so playback can begin before the whole file has downloaded — what websites want.