What does YouTube Video Format Checker do?
Tubelexity inspects a local video without re-encoding it and creates a technical readiness report for YouTube uploads. The checker reads browser metadata and a limited file-header sample to identify the container, common codecs, dimensions, orientation, duration and estimated overall bitrate. Every result is labelled clearly and can be copied or downloaded as TXT or JSON.
How to use YouTube Video Format Checker
- 1Choose a local video file.
- 2Wait for the browser metadata and header analysis.
- 3Review every Good, Acceptable, Warning or Cannot determine check.
- 4Copy or download the technical report and use the recommended tools for corrections.
Supported inputs and outputs
Inputs
MP4, MOV, WebM, MKV when the browser can decode it
Outputs
Visible readiness report, TXT report, JSON report
Practical uses
- Checking a video before upload
- Finding an unusual codec
- Confirming portrait or landscape orientation
- Flagging very low resolution
Browser and media limitations
- This checker cannot guarantee YouTube acceptance.
- Exact stream bitrate, frame rate and pixel format may not be exposed by the browser.
- Encrypted or unusual containers may not expose recognizable headers.
- YouTube requirements and Shorts classification rules can change.
How local processing works
Inspection uses native browser metadata APIs and reads a limited portion of the local file. The video is not re-encoded or uploaded to Tubelexity.
Accepted formats are not the same as recommended encoding
The page verdict is Looks compatible, Needs attention, or Cannot verify. Cannot verify means the video codec, frame rate, or audio identity is missing. A known audio codec other than AAC or Opus is marked for attention rather than left unknown. Bitrate guidance uses YouTube's published SDR bands, including 2160p and 4320p. This inspection does not detect HDR, whose published recommendations are higher. A warning is not proof that YouTube will reject the upload.
Frequently asked questions
What video format is best for YouTube?
MP4 with H.264 video and AAC audio is a common broadly compatible choice, but other supported codecs can also work.
Can I check a video before uploading it?
Yes. The checker creates a local technical readiness report without sending the file to YouTube.
Does the file leave my device?
No. Browser metadata and local file-header analysis run on your device.
Can this checker guarantee YouTube acceptance?
No. It reports likely compatibility and unusual properties; YouTube makes the final processing decision.
How do I fix an incompatible video?
Use the Video Compressor to create a common MP4, the Rotator for orientation, or the Audio Extractor to inspect audio.