Can I combine multiple operations in one batch?

Yes. DocInspector's unified batch pipeline lets you select multiple operations simultaneously — for example, sanitize metadata + remove signatures + watermark — and processes all your files through all selected operations in a single pass, delivering one clean ZIP output.

Is my original folder structure preserved in the output?

Yes. If you upload a folder with subfolders, the output ZIP mirrors your exact original directory tree. If you had 1 folder with 5 subfolders, the output will have the same 1 folder with the same 5 subfolders — all documents processed inside.

Are my files stored on your servers after processing?

No. Files are processed in an isolated encrypted sandbox and permanently deleted immediately after you download the result. Nothing is retained, logged, or stored.

Is this tool GDPR compliant?

Yes. DocInspector is GDPR compliant. No files are stored after processing, no data is shared with third parties, no AI model training occurs, and all transit is encrypted via HTTPS.

Is there a desktop version for fully offline processing?

Yes. DocInspector is also available as a Windows desktop application. All operations run 100% locally — no internet required, no file size limits, no file count limits. Files never leave your computer. Download at doc-inspector.com/en/download.

What types of PDF corruption can this tool fix?

The tool rebuilds broken cross-reference tables, truncated streams, malformed headers, and corrupted internal PDF structures.

My PDF opens but I cannot select or copy any text — can this fix it?

Yes. If your PDF was created from a scan, text exists as an image. DocInspector's built-in OCR converts that visual content into real, selectable, copiable text in the same repair step.

Free Online Document Tools — No Download Required

Repair PDF Online & Fix Corrupted Files

Restore and rebuild corrupted, malformed, or broken PDF documents directly in your browser. Fix invalid cross-reference tables, restore truncated streams, and apply built-in OCR text recognition to make scanned pages searchable. Run repair simultaneously with metadata sanitization, watermarking, or signature removal in a single pass.

🛡️ Zero cloud storage ⚡ Deleted after download 🔒 Encrypted transit (HTTPS) 🤖 No AI — 100% deterministic 🇪🇺 GDPR Compliant 📄 Secure Batch processing

Technical Architecture

PDF Repair & Rebuild Engine

DocInspector parses corrupted binary files and rebuilds their cross-reference tables and object streams.

1 Cross-Reference Rebuilding

Corrupted PDFs usually suffer from broken Cross-Reference Tables (Xref). DocInspector scans the document's binary data, locates all indirect objects, and builds a fresh, valid Xref table from scratch.

2 Stream Fixes & Page Recovery

If a file download was interrupted or truncated, the page streams might be broken. The repair engine closes open brackets, fixes corrupt compressed streams, and extracts all readable page objects.

3 Built-in OCR Correction

Corrupt PDFs often lose their internal search map (ToUnicode CMap), rendering copy-paste unusable. The built-in OCR engine regenerates the text layer, restoring searchability.

Security Architecture

How We Protect Your Documents

Our online tool is built on the same isolation principles as the desktop app. Here is the exact data flow from your browser to the processed output.

💻 Your Browser

→

🔑 Encrypted HTTPS Upload

→

⚙️ Isolated Sandbox

→

🗑️ Immediate Auto-Delete

→

📥 Secure Download

Our Security Commitments

🛡️

No Persistent Storage

Files are stored only in RAM or a short-lived temp directory. Deleted automatically 5 minutes after processing — or immediately upon download.

🔒

Encrypted in Transit

All uploads and downloads use HTTPS/TLS. Your document never travels in plaintext over the network.

🚫

No AI, No Training

We use deterministic CLI tools (qpdf, ExifTool, Ghostscript). Your documents are never fed into any machine learning model.

🇪🇺

GDPR Compliant

We don't collect, store or log file contents. Processing is stateless and private by design.

⚙️

Open CLI Engines

ExifTool, qpdf, Ghostscript — battle-tested open-source tools used worldwide by security professionals.

🔍

Audit-Ready Logs

For the desktop app: every operation is logged with timestamp and SHA-256 hash for full chain-of-custody.

Secure PDF Repair & Recovery Engine

📘 Detailed Technical Guide

Repair damaged PDFs online. Fix cross-reference tables, truncated streams, and CMaps. Combine repair with OCR, metadata sanitization, and watermark overlays in a single pipeline.

❓ Frequently Asked Questions

❓ Can all corrupted PDFs be repaired?

Most layout and header errors can be fixed. If the binary data of the pages was completely overwritten or lost, recovery may be partial.

❓ Does repairing a PDF modify its text content?

No. The engine only fixes the file structure and object index. The visual appearance and text remain unchanged.

Need more power?

Unlock higher limits, batch processing of thousands of files, folder trees, multi-action pipelines and advanced reporting. Choose the plan that fits your workflow.

Upgrade — View Plans & Pricing Download Desktop App