# File Type Verifier — yeezhan.com
> One-time pay-per-task emergency tool to make your file ready for submission.
> No credits, no balance. One payment unlocks one task result, valid for 24 hours.

Tool domain: https://file-type-verify.yeezhan.com
Skill definition: https://file-type-verify.yeezhan.com/skill/SKILL.md
API documentation: https://file-type-verify.yeezhan.com/api/docs

## What this tool does
A file that will not open? Read its magic bytes — detect the real type and expose extensions that lie.

## Typical user problems
- The download says .jpg but nothing opens it; the "PDF" is actually a renamed EXE. Extensions are decoration — the first bytes of a file are its fingerprint. We read the magic bytes, identify the true format (25+ signatures, OOXML细分到 Word/Excel/PPT) and flag any mismatch with the extension.

## Parameters


## Pricing
- Watermarked preview: free, no login required
- Final clean output: $0.99 one-time per task
- Require login (email/phone OTP) to complete payment
- Result available for download 24 hours after payment

## Limitations
- Identification is by signature — an intentionally forged header still wins
- Text-based formats (HTML/CSV/MD) are identified heuristically, not by a signature
- Report only — the file is not repaired or converted