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PDF Header Inspector
x402
PDF Header Inspector is a paid API for AI agents from file-formats.x402tookit.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-29).
Reads PDF version and header position from the first bytes of a file, flagging junk before %PDF- and invalid version strings.
Price / call$0.02
Success—
StatusUnknown
How this service works
Read a PDF's version and header position from its first bytes; flags junk before %PDF- and an invalid version.
Output
Returns a structured object containing the PDF major and minor version numbers, the version string, header offset (bytes before %PDF-), whether the version is valid, whether a binary marker is present, the number of bytes examined, a verdict (valid/invalid), a summary, and a list of reasons for any flags raised.
Example use cases
Validate uploaded PDF file integrity
“I just received a file claiming to be a PDF — here are its first 512 bytes as hex: 255044462d312e340a. Can you check if the %PDF- header is in the right place, what version it is, and whether it's a valid PDF header?”
Detect disguised or corrupted PDFs
“This file is supposed to be a PDF but it might have junk prepended before the real header. Inspect these opening bytes — 0000000000255044462d322e30 — and tell me the header offset, version, and any issues flagged.”
Audit PDF version in document pipeline
“For quality control, I need to know the PDF version of this document — here are the first bytes in hex: 255044462d312e360a. Tell me the major and minor version numbers and confirm the header looks valid.”
Technical details
Endpoint
GEThttps://file-formats.x402tookit.com/pdf-header?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need to quickly inspect the first bytes of a PDF to verify its header structure, determine the PDF specification version, or detect whether junk bytes precede the %PDF- marker — without fully parsing or rendering the document. Ideal for file upload validation pipelines, forensic document triage, or pre-processing checks before passing files to a PDF parser.
Side effects
- Hex string is too short to contain a recognizable PDF header — partial or missing data returned
- Non-hex characters in the hex query parameter — malformed input error
- File bytes do not contain %PDF- at all — invalid verdict with reasons
- Version string present but unrecognized — validVersion returned as false
- Service unavailable or payment not processed — HTTP 402 or 5xx error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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