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H1_PDF Repair - Fix Corrupted PDF Files Online | MultiTool

Rebuild corrupted or broken PDF files: the tool re-creates a clean, valid PDF structure page by page. Free, private, in your browser.

How it works

Upload a damaged PDF and the tool parses its pages and re-saves the document with a fresh, valid structure — dropping broken cross-references and orphaned objects that make readers fail.

What PDF repair can and cannot recover

A PDF breaks in predictable ways: a truncated download (the file ends mid-structure), a damaged cross-reference table (the map that says where each object lives), or a corrupted header. This tool rebuilds the structure — recovering pages the data of which is still physically present in the file.

  • What it fixes well: broken xref tables, missing end-of-file markers, partially recovered downloads — cases where the content is intact but the map is not.
  • What no tool can do: restore bytes that are simply not in the file. If a download stopped at 60% and the rest never arrived, the missing pages cannot be invented — re-download from the source instead.
  • Prevention beats repair: let downloads finish, avoid force-quitting apps mid-save, keep the original scan, and store important documents in two places.
  • Try repair when: a reader shows “format error” or blank pages, but the file size still looks plausible. It runs locally — confidential documents never leave your device.

Your privacy

Everything runs entirely in your browser. Nothing you type is ever sent to any server or stored.

Frequently Asked Questions

What kind of damage can it fix?+

Broken cross-reference tables, truncated trailers, orphaned objects and files rejected by readers. Severe binary corruption cannot always be recovered.

Will it fix password-protected PDFs?+

No — encrypted files must be unlocked first. Use the PDF Unlock tool, then repair.

Does it change my content?+

The text, layout and images are preserved; only the internal structure is rebuilt.

Is my file uploaded anywhere?+

No — everything runs locally in your browser.

Why is the repaired file sometimes larger?+

The rebuild normalizes internal structures and may drop compression on some objects — size differences are normal.

Is it free?+

Yes, completely free with no account.

Related Tools

PDF MERGEPDF UNLOCKPDF COMPRESSPDF METADATA EDITOR