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🔧 Staged Deep Recovery • 100% In-Browser • Zero Server Uploads • Free

Repair Corrupted PDF

Detect, analyze, and repair damaged, truncated, or unreadable PDF files. Rebuilds broken cross-reference (xref) tables, recovers orphaned pages, and repairs structural trailers without server uploads.

Drop corrupted PDF here, or browse files

Supports broken xrefs, missing trailers, and truncated documents. Batch upload supported. 100% private.

How to Repair Damaged PDF Files Online

1

Upload Damaged PDF

Select or drag and drop your corrupted PDF. The binary inspector scans headers, indirect objects, and cross-reference tables.

2

Select Recovery Mode

Choose between Automatic Repair (recommended), Safe XRef Fix, Deep Stream Normalization, or Full Page Tree Rebuilding.

3

Download Repaired PDF

The engine rebuilds the PDF structure, validates it through in-memory reopen tests, and delivers clean, readable files.

Understanding PDF Corruption & Structural Recovery

A PDF document is a complex hierarchy composed of a file header (%PDF-1.x), a body of indirect stream and dictionary objects (obj ... endobj), a cross-reference table (xref) containing precise byte offsets, and a file trailer with a pointer to the root /Catalog and /Pages tree.

When a download is interrupted, a disk sector fails, or a web server serves truncated bytes, the xref table or trailer is often corrupted or missing. When standard PDF readers (like Adobe Acrobat or web browsers) open such files, they throw errors such as "The file is damaged and could not be repaired" or "Invalid cross-reference table".

Our In-Browser PDF Repair Studio scans the raw binary byte stream, extracts all surviving indirect objects, recalculates byte offsets, regenerates valid xref tables, and reconstructs orphaned page tree hierarchies. All operations execute strictly in your browser with zero remote server uploads.

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100% In-Browser Privacy

Zero files are uploaded to servers. All repair, parsing, and reconstruction happen in local browser memory.

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Staged Multi-Pass Engine

Attempts the least destructive structural repairs first before escalating to deep page tree reconstitution.

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Mandatory Reopen Validation

Every repaired document is reopened, parsed, and test-rendered in memory before enabling download.

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Batch & Audit Reports

Process multiple corrupt files concurrently and download individual technical repair logs and ZIP packages.

Frequently Asked Questions (FAQ)

How does PDF repair work without server uploads?

Our engine utilizes WebAssembly libraries (pdf-lib and pdfjs-dist) combined with client-side binary parsers. The browser reads the raw file bytes, scans for indirect objects, calculates offsets, and reconstructs the PDF internal tables entirely in local device memory.

What types of PDF corruption can be fixed?

The tool repairs missing or damaged cross-reference tables (xref), missing trailers, invalid object byte offsets, damaged catalog roots, corrupted metadata headers, missing %%EOF markers, and truncated streams.

Does the tool ever modify my original PDF file?

Never. Your original file remains completely untouched in your local storage. The tool creates a new, independent repaired copy (e.g. document-repaired.pdf) in browser memory.

What happens if only some pages can be recovered?

If some pages are permanently destroyed or truncated, the tool recovers all surviving pages and clearly marks the document as ⚠ Partially Recovered with Warnings in the results screen and technical report.

Can it repair password-protected encrypted PDFs?

If the encryption dictionary is intact, you can provide the password to decrypt and recover the document. The tool does not bypass encryption or crack passwords without authorization.

What happens to digital signatures during repair?

Modifying or rebuilding the structural cross-reference table of a digitally signed PDF inherently invalidates cryptographic signatures. The diagnostic report will flag this accordingly.

Can I repair multiple corrupted PDFs at once?

Yes. You can drag and drop multiple PDF files. Each file undergoes independent analysis and repair stages. You can download all repaired documents together in a single ZIP archive.

What is the Technical Audit & Repair Report?

The repair report is a detailed plaintext audit detailing detected problems, byte shifts, scanned indirect objects, recovery passes executed, and output validation metrics.

Does this tool work on mobile devices and tablets?

Yes. The UI is completely responsive and optimized for mobile touchscreens, iOS Files app, Android file picker, and tablets without horizontal scrollbars.

Are there any file size limits or hidden costs?

No. IMGFixy PDF Repair is 100% free with unlimited document repairs, zero watermarks, and no subscription fees.

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