FILE TOOLS

PDF Signature Check

Inspect multiple files for PDF magic bytes, version and EOF markers, and detect common content mismatches. File inspection stays in your browser.

Open in Workspace →

ABOUT THIS TOOL

More than a file-extension check

A .pdf extension alone does not prove that a file actually contains a PDF. DevPayload inspects beginning and ending file slices, checks the %PDF signature and %%EOF marker, and can identify several common alternative file signatures without uploading the selected files.

COMMON USES

Useful for everyday developer work

Check batches of files received from integrations.
Detect files renamed with a .pdf extension.
Review header, content detection and EOF evidence before escalation.

HOW IT WORKS

Use this tool in three steps

Paste your data.
Choose any available options and run the tool.
Review, copy or download the result.

PRIVACY

Local by default

This public tool runs in your browser. Its input is not written to the DevPayload database.

FAQ

Frequently asked questions

Are selected PDF files uploaded?

No. The checker reads file slices in your browser and does not upload the files during normal inspection.

Does a valid file signature prove the PDF is safe?

No. Signature inspection checks file structure indicators, not malware, document trust, certificate validity or complete PDF conformance.

Do I need an account?

No. Public deterministic tools work without signing in.