PDF Repair Corrupt

Attempt to repair damaged PDF headers and broken/missing XRef tables

Attempt practical recovery of partially-corrupt PDF files.

Repair strategies:

  1. Header normalization (recover misplaced or missing %PDF- header)
  2. qpdf rebuild (object table and xref reconstruction)
  3. pdf-lib rewrite fallback for mildly damaged structure
  4. Ghostscript rewrite fallback

Not all severely corrupted files are recoverable.

Example Results

2 examples

Repair Broken XRef PDF

Attempt to recover a PDF with broken cross-reference table

pdf-repair-corrupt-example1.pdf View File
View input parameters
{ "sourceFile": "/public/samples/pdf/pdf-2026-02-19-source-4pages.pdf" }

Repair Header-Damaged PDF

Try restoring a PDF that has a shifted or malformed file header before the %PDF marker

pdf-repair-corrupt-example2.pdf View File
View input parameters
{ "sourceFile": "/public/samples/pdf/pdf-2026-02-19-source-4pages.pdf" }

Click to upload file or drag and drop file here

Maximum file size: 500MB Supported formats: application/pdf, application/octet-stream

Key Facts

Category
Documents & PDF
Input Types
file
Output Type
file
Sample Coverage
4
API Ready
Yes

Overview

PDF Repair Corrupt is a specialized utility designed to recover inaccessible PDF files by fixing damaged headers, missing XRef tables, and broken internal structures. It employs a multi-layered recovery strategy, including qpdf reconstruction, pdf-lib rewriting, and Ghostscript processing to restore file integrity.

When to Use

  • •When you receive a 'File is damaged or could not be repaired' error message.
  • •When a PDF file fails to open due to a missing or corrupted cross-reference (XRef) table.
  • •When a file header is malformed or missing the standard '%PDF-' identifier.

How It Works

  • •Upload your damaged PDF file to the tool.
  • •The system attempts to normalize the file header and reconstruct the object table.
  • •If the initial repair fails, the tool automatically applies secondary recovery methods using pdf-lib or Ghostscript.
  • •Download the reconstructed PDF file once the recovery process is complete.

Use Cases

Recovering important documents that were interrupted during a download or transfer.
Fixing PDF files that were partially overwritten or corrupted by storage media errors.
Restoring access to legacy PDF files that have developed structural inconsistencies over time.

Examples

1. Repair Broken XRef PDF

Background
A user downloaded a large report, but the file would not open in any PDF viewer, showing an error related to the cross-reference table.
Problem
The XRef table was incomplete, preventing the PDF reader from locating the document's pages.
How to Use
Upload the damaged file to the tool and initiate the repair.
Outcome
The tool reconstructed the XRef table, allowing the document to be opened and read normally.

2. Repair Header-Damaged PDF

Background
A file was accidentally edited in a text editor, causing the '%PDF-' header to be shifted or deleted.
Problem
PDF readers failed to recognize the file format because the required header was missing.
How to Use
Upload the file to the tool to perform a header normalization.
Outcome
The tool restored the correct file header, enabling the PDF to be recognized and opened by standard software.

Try with Samples

pdf, file
PDF Samples
Generated PDF samples from tools dated 2026-02-01 to 2026-02-10
title token pdf
pdf
Markdown Slide Deck Samples
Remark/Marp style Markdown slide decks for testing PDF export layouts
preferred input family pdf
pdf
Time Zone Workflow Scheduler ICS Samples
ICS files generated in the same structure returned by the Time Zone Workflow Scheduler, with multiple VEVENT meeting candidates exported from overlap windows
matched family file
file
VTT Subtitle Samples
Sample WebVTT subtitle files from simple to complex for subtitle previews, parser testing, conversion, and note handling
matched family file
file

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FAQ

Can this tool fix all corrupted PDF files?

No. While the tool is effective for structural issues like broken XRef tables or header errors, it cannot recover data from files that are severely encrypted or physically missing data.

Is my data secure during the repair process?

Yes, your files are processed in a secure environment and are not stored permanently on our servers.

What is an XRef table?

The XRef table is a critical component of a PDF that acts as an index, telling the PDF reader where each object is located within the file.

Does the tool modify the original file?

No, the tool creates a new, repaired version of your file, leaving your original source file untouched.

Are there file size limits?

Yes, the tool supports files up to 500MB for the repair process.

API Documentation

Request Endpoint

POST /en/api/tools/pdf-repair-corrupt

Request Parameters

Parameter Name Type Required Description
sourceFile file (Upload required) Yes -

File type parameters need to be uploaded first via POST /upload/pdf-repair-corrupt to get filePath, then pass filePath to the corresponding file field.

Response Format

{
  "filePath": "/public/processing/randomid.ext",
  "fileName": "output.ext",
  "contentType": "application/octet-stream",
  "size": 1024,
  "metadata": {
    "key": "value"
  },
  "error": "Error message (optional)",
  "message": "Notification message (optional)"
}
File: File

AI MCP Documentation

Add this tool to your MCP server configuration: 

{
  "mcpServers": {
    "elysiatools-pdf-repair-corrupt": {
      "name": "pdf-repair-corrupt",
      "description": "Attempt to repair damaged PDF headers and broken/missing XRef tables",
      "baseUrl": "https://elysiatools.com/mcp/sse?toolId=pdf-repair-corrupt",
      "command": "",
      "args": [],
      "env": {},
      "isActive": true,
      "type": "sse"
    }
  }
}

You can chain multiple tools, e.g.: `https://elysiatools.com/mcp/sse?toolId=png-to-webp,jpg-to-webp,gif-to-webp`, max 20 tools.

Supports URL file links or Base64 encoding for file parameters.

If you encounter any issues, please contact us at [email protected]