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File Format Inspector – Magic Bytes Identifier
x402
File Format Inspector – Magic Bytes Identifier 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).
Identifies a file's type from its first bytes (magic bytes) by matching against 40+ signatures including PNG, JPEG, PDF, ZIP, ELF, EXE, MP4, and SQLite.
Price / call$0.02
Success—
StatusUnknown
How this service works
Identify a file type from the first bytes (hex): PNG, JPEG, PDF, ZIP, ELF, EXE, MP4, SQLite and 40+ more signatures.
Output
Returns the detected MIME type, human-readable file type name, file category, a list of all matching signatures with their MIME types and categories, usual file extensions, a plain-language verdict and summary, the number of bytes examined, and flags for degraded confidence or unchecked signatures.
Example use cases
Security scan for disguised executables
“I've got a suspicious file upload and I want to check its actual type from these first bytes: '4d5a9000030000000400000000ffff0000' — is this an executable or something else? Give me the MIME type and any security flags.”
Pipeline validation for uploaded media
“Before processing this user-uploaded file, check what it really is from its header bytes '667479706d703432' — I need to know the MIME type and file category to route it correctly.”
Forensic file type recovery
“I'm trying to recover files with missing extensions and I need to identify this one from its magic bytes: '255044462d312e34' — what file format is it, what MIME type should I assign, and what extension should it have?”
Technical details
Endpoint
GEThttps://file-formats.x402tookit.com/magic-bytes?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need to programmatically determine a file's true format from its raw bytes rather than relying on file extensions or metadata. Ideal for security pipelines (detecting disguised executables), upload validation, forensic file recovery, and content routing. Prefer this over extension-checking when the file extension may be missing, incorrect, or untrusted. The sibling endpoints on this host offer deeper parsing for specific formats (PNG dimensions, JPEG markers, etc.) — use this one first for broad identification across 40+ types.
Side effects
- Too few bytes provided — fewer than the minimum required for any signature match returns null fields or low-confidence result
- Unrecognized format — no matching signature returns null MIME and type with an empty matches array
- Malformed hex input — non-hex characters beyond allowed separators (spaces, colons, hyphens) may cause an error
- Ambiguous header — some formats share early bytes, resulting in multiple matches with no single verdict
- Service unavailable or payment failure — returns HTTP error with no file type data
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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