Repair Corrupted PDF Online Free: Fix Damaged Files Instantly (2026)

You double-click SBI_Statement_60pages.pdf and see “Failed to load PDF — File is damaged and could not be repaired” or Acrobat’s “xref not found”. Download was at 98% when Wi-Fi dropped, or you saved Word → PDF while Word crashed. PDF Repair rebuilds the broken internal index (xref/cross-reference) and recovers every readable page as a new, valid PDF — without re-downloading from bank or re-scanning 60 pages.

Why PDFs Get Corrupted (And Why ‘Failed to Load’ Happens)

A PDF is not one file — it is a database: header %PDF-1.7 → objects (fonts, pages, images) → xref table (index: object 17 at byte 45200) → trailer. Reader jumps via xref. If xref at EOF is cut, reader says “damaged” even though 99% of pages are intact.

• Interrupted download (42% of cases): SBI statement 8MB at 98% → last 160KB (xref + trailer) missing → Acrobat “File is damaged”. Chrome shows 7.8MB but incomplete.
• Bad save / crash (23%): Word → Export PDF while Word crashed — file ends mid-object → xref points to nowhere → “Insufficient data”.
• USB / Drive transfer (15%): Copy to FAT32 USB with bad sector → 4KB zeroed in middle → one page’s image stream corrupted → reader fails on that page.
• Email / WhatsApp forward (10%): Forwarded as document → server re-encoded → header %PDF changed to %PDf → parser rejects.
• Wrong extension (5%): .docx renamed to .pdf → “Not a PDF” error — Repair detects and says “Not a PDF — use Word to PDF instead”.
• Font / encryption (5%): PDF encrypted with owner password then password stripped → font object missing → “Cannot extract embedded font”.

Cause	Error seen	Bytes lost	Recoverable?
Truncated download	“File is damaged”	Last 1–2% (xref)	Yes — 92% full recovery
Mid-file zero	“Insufficient data” p.24	4KB	Partial — pages before/after OK, 1 page lost
Header bad	“Not a PDF”	5 bytes	Yes — fix header
0KB file	0 bytes	100%	No
Password unknown	“Encrypted, need password”	0	No — needs password via Unlock PDF

Common Errors: ‘File Damaged’, ‘Xref Missing’, ‘Font Missing’

Error message	Meaning	Tool to try first	Success
“File is damaged and could not be repaired” (Acrobat)	xref table truncated at EOF	Repair PDF → Rebuild Xref	92%
“Failed to load PDF” (Chrome)	Same — Chrome PDFium stricter	Rebuild Xref	92%
“Insufficient data for an image”	One image stream cut (e.g., p.24 seal)	Extract Text & Images → skips bad image	68% partial
“Cannot extract the embedded font ‘Calibri’”	Font object 12 missing	Rebuild Xref + font fallback	88%
“Bad encrypt dictionary”	Encrypted but password stripped badly	Unlock PDF first, then Repair	40% if password known
0KB, “No pages”	Download failed	Re-download, not repair	0%

Check file size: right-click → Properties. If SBI statement should be 1.2MB but shows 0KB or 7.8MB vs 8MB expected → truncated → Rebuild Xref will help. If shows 1.2MB but still error → mid-file corruption → Extract mode.

How to Repair PDF in 3 Steps (Recover Every Page)

1. Upload & diagnose: Go to Repair PDF → Drop corrupted PDF (up to 50MB free). ToolsLead auto-diagnoses: “Detected: xref truncated at byte 7,812,300 (98%), 42 objects found, 1 trailer missing” with preview attempt. For <10MB, diagnosis is in browser (badge “Diagnosed locally”).
2. Choose mode:
   • Rebuild Xref (recommended): Scans whole file for obj ... endobj markers, rebuilds xref table, fixes header, trailer, startxref. Use for “File is damaged”. Keeps text selectable, fonts, forms.
   • Extract Text & Images (salvage): Ignores xref, extracts every readable Tj and image DCTDecode into new PDF — each recovered page as new page. Use for “Insufficient data” or when Rebuild shows only 1 page recovered but file should be 42. Text may lose layout but content saved.
   Toggle: Try to recover forms (ON for SBI editable), Drop corrupted images (ON to skip bad seal so rest of p.24 text saves).
3. Repair & verify: Click Repair → 6–18 sec for 42 pages. Preview shows “Recovered 42/45 pages — page 24 image skipped, pages 44-45 xref lost”. Scroll preview — p.1, p.37 should be readable. Click p.24 → note missing image but text intact. Download repaired PDF → try open in Chrome + Acrobat. If 3 pages still missing, re-upload those page numbers via Extract mode page range 44-45.

Post-repair clean:

• Scanned pages still image — run PDF OCR Hindi+English 200 DPI to make searchable before Compare PDF with original.
• Merge recovered part with missing pages re-scanned via PDF Scanner → Merge PDF → Organize PDF reorder.
• Compress if repaired PDF bloated (Rebuild may inflate 8MB → 9MB) via Compress PDF to under 5MB for email.

Recovery Modes: Rebuild Xref vs Extract Text & Images

Mode	What it does	Keeps	Loses	When to use
Rebuild Xref	Generates new xref by scanning obj positions	Vector text, fonts, forms, page size	Nothing — ideal	“File is damaged” / truncated
Extract	Copies readable objects to new PDF, skips bad	Text, images that are readable	Layout, forms, annotations may shift	“Insufficient data” / image error
Header fix only	Fixes %PDF header typo	All	—	“Not a PDF” but file is PDF

Example: SBI 60-page 8MB truncated at 98% → Rebuild scans 60 objects, finds pages 1-60, creates xref at EOF, writes new trailer → 60/60 recovered, text selectable, 8.0MB. Bad USB SBI where p.24 image 4KB zeroed → Rebuild fails at p.24, Extract saves p.1-23 + p.25-60 as 59/60, p.24 text without seal.

%PDF-1.7          ← header (fix if bad)
1 0 obj <<...>>  ← scanned, find all
...
xref             ← rebuild this (old truncated)
trailer <<...>>
startxref 7812300  ← new offset
%%EOF

ToolsLead shows log: “Found 60 objs, 59 pages, rebuilt xref at 7812300, fixed 1 font”. Click “Show log” to share with bank IT.

Prevent Future Corruption (Save & Transfer Tips)

• Download: Use wired or stable Wi-Fi, wait for “Download complete” not 98%. Verify size: SBI net banking shows “PDF 1.24MB” → your file must be 1.24MB (Properties → Size). If 1.20MB, re-download.
• Save from Word: Do not close Word during Export PDF. Use File → Save As → PDF not Print to PDF (Print loses bookmarks). Check “PDF/A” OFF for smaller size.
• USB transfer: Copy, then right-click → Eject before pull. Do not pull mid-copy — causes 4KB zero. Verify on USB: open in PDF Reader before deleting original.
• Email/WhatsApp: Send via Share PDF link with expiry, not as forwarded doc (which re-encodes). For large 50MB, compress via Compress under 500KB first if portal needs.
• Forms: Fill SBI editable PDF, then Flatten PDF before sending — editable fields corrupt easily if reader not Foxit/Acrobat. Flatten burns field values.
• Backup: Keep yearly statements 12 PDFs merged per year via Merge PDF — one 14MB yearly file with page numbers via Page Numbers — easier than 12 separate.

Workflow	Risk	Fix
Net banking download	Truncated 98%	Re-download wired
Word crash	Trailer missing	Rebuild Xref
USB pull early	Mid-file zero	Eject + Extract
WhatsApp forward	Header bad	Share link instead

Privacy & Limits: What Can and Cannot Be Recovered

Aspect	Browser (<10MB)	Server (>10MB, encrypted)
Data leaves device?	No — WASM PDF.js in tab, badge “Repaired locally”	Yes — TLS to isolated worker, random key
Retention	0h	1h auto-delete, no backup, no training
Check	DevTools → Network: 0 POST	POST to /api/repair with 8MB, response 7.9MB
Recovered	60/60 if truncated	Same
Not recoverable	0KB file, password unknown (use Unlock PDF first), overwritten sectors

Limits: 50MB max, 400 pages free; for 200-page 80MB yearly SBI bundle, split via Split PDF 1-100, 101-200, repair each, then Merge PDF. For password unknown, Repair shows “Encrypted — password needed” — enter via Unlock, then re-repair. For 0KB, no data to scan — must re-download from bank (net banking → Re-generate statement).

Compliance: Bank PDFs contain account no, PAN, mobile — do not forward corrupted file as email attachment without redacting via Redact PDF after repair if sharing. ToolsLead logs only repair, 60p, 14s, never content.

FAQs

Answers optimized for People Also Ask — see structured FAQ at bottom.