AirPDF
Merge PDF
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PDF Repair & Content Rescuer — Fix Damaged PDFs

Repair damaged, unopenable, or corrupted PDF files directly in your browser. Rebuild broken XRef tables, restore missing trailers, and salvage pages with zero cloud uploads.

Select corrupted or damaged PDF to repair

Drag & drop your damaged PDF here, or click to choose from your device.

Choose Damaged PDF
Zero cloud uploads • Binary stream rescuer • No file size limit

How to use PDF Repair & Content Rescuer — Fix Damaged PDFs

1

Upload damaged PDF

Choose or drop your corrupted or broken PDF file. The repair engine immediately analyzes binary stream health.

2

Automated Stream Analysis

Our in-browser scanner identifies intact objects, cleans header junk bytes, and reconstructs missing trailers and EOF markers.

3

Rebuild & Transfuse Pages

Intact page streams are salvaged and transfused into a brand-new, standards-compliant PDF container.

4

Download Repaired PDF

Review the transparent recovery diagnostic report and download your restored PDF document with 1 click.

Restore Damaged, Broken, and Unopenable PDF Files

Encountering an error like “The document is damaged and cannot be repaired” or “Invalid Cross-Reference Table” can cause panic, especially when it involves irreplaceable research, contracts, or assignments. Many commercial utilities charge high subscription fees or demand that you upload sensitive files to third-party cloud servers.

AirPDF provides a 100% free, private in-browser PDF Repair & Content Rescuer. Everything runs locally on your device using WebAssembly and modern JavaScript, allowing you to salvage vital pages and documents without security risks.

Multi-Stage Resilient Recovery Engine

Our repair engine does not give up when standard PDF parsers crash. It executes a resilient 4-stage binary rescue pipeline:

  1. Header Normalization & Prefix Stripping: Scans for standard %PDF- magic bytes and removes leading junk data, HTTP headers, or server warnings.
  2. Missing Trailer & EOF Reconstruction: Rebuilds missing trailer dictionaries and %%EOF markers from incomplete downloads.
  3. Cross-Reference (XRef) Table Rebuilding: Systematically indexes all indirect objects and calculates exact 10-digit byte offsets.
  4. Safe Page-by-Page Transfusion: Extracts each intact page into a brand-new clean PDF container, skipping any isolated corrupted byte streams so the rest of your document opens smoothly.

Detailed Diagnostic Transparency

Once repaired, AirPDF presents a clear recovery report detailing exactly how many pages were recovered, which fixes were applied, and the original vs. repaired file size comparison.

Frequently Asked Questions

How does in-browser PDF repair work? ▼

Standard PDF viewers fail when a file has broken byte offsets, missing trailer dictionaries, or leading server junk bytes. AirPDF's client-side repair engine performs a direct linear scan of the raw byte stream, locates all intact objects and page streams, rebuilds a brand-new cross-reference table, and packages them into a clean, standards-compliant PDF.

What causes PDF documents to get corrupted? ▼

Common causes include interrupted web downloads, premature email attachments, unstable USB transfers, buggy third-party export tools that write incorrect byte offsets, or server-side scripts injecting HTML/PHP errors before the PDF header.

Can all damaged PDF documents be repaired? ▼

Most damaged PDFs suffer from structural metadata corruption (broken XRef tables or truncated trailers) and can be 100% restored. However, if the file is completely zeroed out or overwritten with unrelated binary data, pages that were never written cannot be reconstructed.

Are my broken files uploaded to remote servers? ▼

Never. All binary analysis, object scanning, and page reconstruction occur entirely in your local browser memory sandbox. No files or salvaged pages are ever transmitted across the internet.

Will repairing the PDF reduce document visual fidelity? ▼

Not at all. The repair engine preserves the original vector objects, TrueType fonts, and compressed image streams without re-compressing or rasterizing them, ensuring 100% visual fidelity.

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