PDF Repair
Diagnose and recover damaged, corrupted, truncated, or unreadable PDF documents directly in your browser.
Corrupted cross-reference tables and damaged trailer dictionaries are reconstructed in local memory without uploading files.
The FileTools PDF Repair tool reconstructs damaged, corrupted, or truncated PDF documents entirely in your browser. It features a progressive multi-tier recovery pipeline: header signature normalization, cross-reference (XREF) rebuilds, trailer dictionary synthesis, integer-overflow-tolerant parsing, raw page object salvaging, and an emergency visual raster reconstruction fallback.
Key Challenges Solved
- ✓ Bypass file upload size caps and process your pdf repair tasks directly in browser RAM.
- ✓ Works instantly in your browser without requiring desktop software installation or admin rights.
- ✓ Zero data leakage guarantee—files are processed locally and never stored on remote servers.
Who Is PDF Repair Built For?
Students and researchers formatting submissions under tight deadlines
Legal, financial, and healthcare professionals handling regulated documents
Small business owners, freelancers, and remote workers needing quick file workflows
Key Features & Benefits
Multi-Tier Recovery Engine
Progresses from non-destructive header normalization to stream salvaging and emergency visual recovery.
XREF & Trailer Synthesis
Rebuilds broken, offset, or missing cross-reference tables and synthesizes corrupted trailer dictionaries.
Page Stream Salvaging
Harvests uncorrupted page objects even when trailing bytes were truncated during incomplete downloads.
100% Local File Recovery
Repair proprietary documents and confidential records securely without transmitting data to remote servers.
How to Use PDF Repair
- Select or drag and drop your corrupted PDF file into the repair tool.
- Our multi-tier engine analyzes the document structure and attempts progressive recovery.
- Review the diagnosis report and download your repaired PDF.
Common Use Cases
Interrupted Download Recovery
Recover documents that were partially downloaded or truncated due to dropped connections.
Corrupt Email Attachments
Fix PDF attachments that fail to open in Adobe Acrobat with "file is damaged" errors.
Legacy & Non-Conforming PDFs
Standardize older non-conforming PDF files into valid ISO 32000 compliant documents.
Continue Your Workflow
Recommended logical next steps after using PDF Repair:
PDF Metadata Inspector
Inspect document properties, creation dates, embedded JavaScript actions, attachments, and catalog structure directly in your browser.
Open tool →Sanitize PDF
Deeply sanitize PDF files by stripping JavaScript, launch actions, tracking streams, attachments, and sensitive metadata.
Open tool →Compress PDF
Reduce PDF file size by optimizing the document.
Open tool →You May Need This Before
Common preparation and prerequisite steps before PDF Repair:
Important Operational Notes & Realistic Limitations
- Severely corrupted files where underlying content streams were completely overwritten with zeros cannot be reconstructed.
- Password-protected encrypted files with lost encryption keys cannot be repaired.
- Visual raster recovery produces an image-based PDF where original vector paths, interactive form fields, and selectable text streams may not be preserved.
How to Compress a PDF Without Losing Too Much Quality
Learn why PDF files become huge, how image downsampling and JPEG quantization work, and how to reduce file sizes safely for email and portal submissions.
Frequently Asked Questions
Why do PDF files become corrupted?
Common causes include incomplete internet downloads, email gateway encoding errors, bad storage sectors, and improper software crashes during saving.
What is the visual raster recovery fallback?
When a PDF has damaged internal dictionaries that prevent standard structural reconstruction, our engine uses PDF.js to render surviving pages to high-resolution bitmaps and bundles them into a recovered PDF document.
Are my private files sent to your servers?
No. FileTools operates completely client-side. Your documents never leave your computer or mobile device.
What types of PDF corruption can this tool fix?
It fixes damaged cross-reference (XREF) tables, missing EOF markers, unclosed stream objects, and malformed header signatures.
Can it recover files that are zero bytes or encrypted?
No. A file must contain readable PDF object fragments. Zero-byte files or corrupted ciphertext cannot be decrypted or repaired without keys.
Is /repair-pdf the official route?
Yes, /repair-pdf is the canonical route for the FileTools PDF Repair tool. Any legacy links to /pdf-repair permanently redirect here.