Header Error

Fix PDF Header Not Found — Recover Your Document

Fix 'PDF header not found' or 'Invalid header' errors. Repair PDFs with missing or corrupted file headers. Free online, browser-only processing.

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Drop your PDF here to fix the header error

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Why This Happens

The first 8 bytes of the PDF (the '%PDF-X.Y' signature) are overwritten, missing, or corrupted. Without a valid header, no PDF reader will attempt to parse the file.

How We Fix It

We detect the PDF version from internal markers, prepend a clean header, and verify the file structure is consistent with the version declared.

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The Problem

Your PDF won't open at all — no error details, just 'PDF header not found'. The file exists but every reader rejects it as invalid.

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The Solution

Restore a valid PDF header so your file opens normally, without needing the original source document.

Why This Fix Works

✓100% free — no hidden charges or trial periods
✓Works in your browser — no downloads or installations
✓Privacy first — files never leave your device
✓Processing in seconds, not minutes
✓No account required — just fix and download

Frequently Asked Questions

Can a PDF with a missing header still have all my data?

Yes. The header is just a version stamp. The actual content, objects, and streams are stored after the header. Your data is almost always intact.

How does the header get corrupted?

Text editors saving over a PDF, FTP transfers in ASCII mode, or file recovery tools that overwrite the beginning of the file are common causes.

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