Repair Corrupt PDF.
Fix corrupted or damaged PDF files and restore document integrity.Your damaged data stays private. We fix it inside your browser.
Bank-Grade Privacy
Docs are decrypted and processed strictly within your browser's RAM.
Zero Latency
Skip the upload queue. WASM processing is up to 50x faster than traditional servers.
No Cloud Sync
We have no database. Your documents exist only while this tab is open.
Privacy
Local Worker
Execution
Off-Main Thread
Memory
Auto-Volatile
Mastering Repair
Follow our 100% private workflow. Since DocuStitch uses client-side logic, your document data never touches a remote server.
Select Damaged PDF
Choose the corrupted file. Our engine creates a secure local pointer to the file without sending a single byte to a server.
Structural Analysis
The WASM engine scans for broken cross-reference tables and missing trailers, reconstructing the PDF map in your RAM.
Restore & Download
The repaired document is serialized as a fresh, healthy PDF. Download it instantly to your local drive.
Why Private Processing?
Comparing DocuStitch vs. Standard Online PDF Tools
- 0% Data leakage risk
- WebAssembly RAM execution
- Immediate session wipe
- Server-side caching
- Unencrypted file transit
- Data harvesting risks
How We Recover Data
XREF Table Reconstruction
If the cross-reference (XREF) table is broken, your PDF won't open. Our engine manually crawls the file objects to rebuild a valid map of your document.
WASM Bit-Repair
We utilize WebAssembly to perform bit-level analysis of the PDF trailer. This allows us to recover contents even when the file was prematurely terminated during a download.
Securely Fix Corrupted and Damaged PDF Files Locally
PDF files can become corrupted for various reasons: interrupted downloads, storage media failure, or errors during document creation. When a critical report or legal document won't open, the immediate reaction is often to use an online "fix my PDF" service. However, corrupted files often contain your most sensitive data. Uploading them to a cloud-based repair tool is a major privacy trade-off. DocuStitch provides a secure, on-device recovery solution.
Our Repair PDF tool utilized a structural restoration engine built on WebAssembly (WASM). When a PDF is corrupted, it's often the "map" of the document (the XREF table or the trailer) that is broken, while the actual content remains intact. Our engine manually crawls the file objects to reconstruct this internal map in your browser's RAM. Because this happens locally, your damaged data stays 100% private and never touches our infrastructure.
By fixing the file's internal indices and normalizing stream integrity, our engine can often restore access to documents that are otherwise unreadable, all while maintaining the zero-knowledge privacy standards required for modern data sovereignty.
XREF Reconstruction
Manually rebuilds the PDF's internal address map when the file's indices are lost or damaged.
WASM Restoration
Executes heavy file-crawl logic using high-performance WebAssembly directly in your browser sandbox.
Privacy in Recovery
Fix your most sensitive files without the fear of cloud exposure. No bytes leave your system.
Instant Results
Eliminate the upload/download phase for large corrupted files. Recovery starts the moment you drop the file.
Frequently Asked Questions
Everything you need to know about Repair PDF
Can you fix a PDF that says 'File not found'?
Will I lose data during the repair process?
Is it safe to repair financial or legal documents here?
What types of corruption can you fix?
Knowledge Hub
Stop Uploading. Start Processing Locally.
Join thousands of professionals who trust DocuStitch for mission-critical PDF operations without the risk of cloud leaks.