# Media File Info — Duration, Resolution & Codec Support

> Read the duration, dimensions, frame rate and playability of an audio or video file.

This reads an audio or video file's duration, resolution, aspect ratio and average bitrate by decoding its metadata with your browser's own media engine. Because it uses the same decoder that would play the file, a successful reading also proves the file is playable in this browser — and a failure identifies an unsupported codec rather than a corrupt file.

**URL:** https://convertto.tech/t/media-file-info
**Category:** Browser & Device (https://convertto.tech/c/browser-tools)
**Privacy:** Runs entirely in the browser; no upload
**Cost:** Free, no sign-up
**Last updated:** 2026-08-01

## Key facts

- **Privacy:** Runs entirely in your browser — nothing is uploaded
- **Cost:** Free, unlimited, no sign-up

## How to use

1. Select your media file — the file stays on your device and is never uploaded.
2. Press Run, then download the result when it is ready.

## FAQ

### Why can this not tell me the exact codec?

Browsers deliberately do not expose the decoded codec string of a local file — the media element reports geometry and duration only. What a successful read does prove is that your browser can play it, which is usually the actual question behind "what codec is this".

### Why is the duration reported as unknown?

WebM files written by MediaRecorder often lack a duration in the header, because the length was not known while recording. The file plays fine; the header simply says nothing. Re-encoding it with the video converter writes a correct duration.

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