Repair Damaged PDF Files Online
Fix corrupted, broken, or unreadable PDF files and recover their content. Free, fast, and runs entirely in your browser — no upload needed.
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Maximum file size: 10MB
A damaged PDF is one of the most frustrating things a knowledge worker can encounter. The file might open as a blank page, show a "file is corrupt" error, refuse to print, or display only some of its content while the rest is unreadable. Most often this happens because the file was incompletely downloaded, the originating program crashed during export, the storage media developed a bad sector, or the PDF was edited by a tool that wrote a malformed structure. Dokfo's free PDF repair tool attempts to reconstruct the internal structure of broken PDFs by rebuilding the cross-reference table, recovering orphaned page objects, fixing damaged stream headers, and stripping invalid metadata. In many cases — especially with PDFs that suffer from common structural corruption — the recovered file opens cleanly and looks identical to the intended original. Repair runs in your browser using a WebAssembly-compiled PDF engine. Your damaged file is read locally, analyzed, repaired, and saved back to disk — no upload, no server, no exposure of potentially sensitive content.
How to Repair a PDF — Step by Step
1
Upload the damaged or corrupted PDF by clicking the upload area or dragging the file. Dokfo loads it locally and starts analyzing the file structure for errors.
2
Dokfo automatically scans the PDF for structural corruption — broken cross-reference tables, orphaned objects, malformed streams — and attempts repair using its WebAssembly engine.
3
Once repair completes, download the recovered PDF. Open it in any PDF viewer to confirm the content is now readable. If repair fails, the original file may be too damaged to recover.
Why Repair PDFs With Dokfo?
Recovers Most Common Corruption
Fixes broken cross-reference tables, missing page objects, malformed file headers, and incomplete downloads — the most common causes of unreadable PDFs in real-world workflows.
Browser-Based Privacy
Repair runs locally with WebAssembly. Your damaged file — possibly containing sensitive content like contracts, medical records, or financial reports — never leaves your device.
No Software to Install
Skip downloading desktop PDF repair tools. Dokfo runs in any modern browser on Windows, Mac, Linux, iOS, Android, and ChromeOS — open the page and start repairing.
No Watermarks, No Limits
Recovered PDFs come out clean — no watermarks, no branding, no "recovered by" header. The output is the original file, just usable again.
When to Repair a PDF
- Fix a PDF that was incompletely downloaded — common when a network drops mid-transfer or a browser session is interrupted.
- Recover content from a PDF that was generated by a crashing application (e.g., Word, InDesign, or LaTeX exporters that exited with an error).
- Restore a PDF rescued from a failing hard drive, USB stick, or cloud storage where some bytes may have been corrupted.
- Repair PDFs created by older or buggy tools that write structurally invalid files which strict viewers refuse to open.
- Try to recover a PDF that opens with errors in Adobe Acrobat or shows blank pages in your browser's PDF viewer.
Damaged Files Stay on Your Device
Dokfo's PDF repair tool runs 100% client-side using WebAssembly compiled from MuPDF. Your damaged PDF is read into browser memory, repaired locally, and saved back to disk — without any server round-trip. This is critical when the corrupted file contains sensitive information you don't want to send to a stranger's cloud service for recovery. Verify in Developer Tools → Network tab: zero PDF data is transmitted during repair.
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Frequently Asked Questions About Repairing PDFs
Can Dokfo fix any corrupted PDF?
Dokfo can repair most structurally damaged PDFs — those with broken cross-reference tables, missing or malformed objects, incomplete headers, or invalid streams. Files that have suffered severe content-level damage (large chunks of missing data) may be only partially recoverable or unrecoverable.
What kinds of PDF damage can be repaired?
Common, repairable issues include: incomplete downloads, broken cross-reference (xref) tables, orphaned page objects, malformed metadata, invalid stream headers, and PDFs generated by crashing applications. Damage caused by encryption errors or large data loss is harder to fix.
Will my PDF look the same after repair?
If the structural damage is in the file metadata (which is most common), the repaired PDF looks identical to the intended original. If pages or content streams are partially missing, the recovered PDF will contain whatever could be salvaged — sometimes most pages, sometimes only a subset.
Is the repair process safe for confidential PDFs?
Yes. Repair happens entirely in your browser using WebAssembly. Your damaged file never reaches any server, which makes Dokfo safe even for highly sensitive corrupted documents.
What if Dokfo can't repair my PDF?
If the damage is too severe (large data loss, encryption corruption), no tool will be able to recover the file completely. In that case, try to recover the file from a backup, version history (Google Drive, Dropbox), or by re-exporting from the source application.
Does repair work on password-protected PDFs?
Repair attempts to fix structural issues, not password issues. If a password-protected PDF is also damaged, you typically need to remove the password first (using Dokfo's Unlock PDF tool, with the password) before repair will succeed.
Will the repaired PDF have a watermark?
Never. Dokfo never adds watermarks to repaired files.
Are my files uploaded to your server?
No. The entire repair process runs in your browser using WebAssembly. Inspect the Network tab to confirm zero data transmission.