ZTools › Optimize

Repair PDF

Rebuild a corrupted PDF’s structure.

Repair PDF attempts to fix corrupted PDFs by rebuilding the cross-reference table and skipping broken objects. It works best for files with damaged structure rather than missing data.

How to use Repair PDF

1. Drop your PDF into the upload box, or click it to browse. The file stays on your device.
2. Click Repair to rebuild the file structure.
3. Click the button and the result downloads straight from your browser.

Questions

Is Repair PDF free?

Yes. Every tool on ZTools is free, with no limits, watermarks or sign-up.

Are my files uploaded to a server?

No. Repair PDF runs entirely in your browser using JavaScript and WebAssembly. Your files never leave your device and nothing is stored.

Does it work on my phone?

Yes. ZTools works in any modern browser on desktop, tablet or phone. Large files take longer on low-end devices because all the work happens locally.

All tools

Organize

• Merge PDF: Combine multiple PDFs into one document.
• Split PDF: Split by page ranges or into single pages.
• Remove Pages: Delete the pages you don’t need.
• Extract Pages: Pull selected pages into a new PDF.
• Organize PDF: Reorder pages with drag and drop.

Convert

• PDF to Image: Export pages as JPG, PNG, or WEBP, or pull out embedded images.
• Image to PDF: Turn JPG, PNG, WEBP, GIF, BMP or SVG images into a PDF.
• PDF to Word: Extract text and headings into an editable DOCX.
• PDF to Excel: Pull tabular text out of a PDF into a spreadsheet or CSV.
• PDF to PowerPoint: Export PDF pages as PowerPoint slides.
• PDF to Markdown: Turn a PDF into Markdown for notes, docs, and LLMs.
• PDF to EPUB: Turn a PDF into a reflowable e-book.
• Extract Text: Pull all the text out of a PDF as plain text.
• Word to PDF: Convert a DOCX document into a PDF.
• Excel to PDF: Turn spreadsheets into printable PDFs.
• HTML to PDF: Convert an HTML file into a PDF document.
• Text to PDF: Type, paste, or drop a .txt or .md file to make a PDF.
• EPUB to PDF: Turn an e-book into a PDF, chapter by chapter.

Edit

• Rotate PDF: Turn pages left, right, or upside down.
• Crop PDF: Trim margins or keep just one area of the page.
• Edit PDF: Add text and images anywhere on a page.
• Watermark PDF: Stamp text or an image across every page.
• Page Numbers: Add page numbers in any position.
• Fill PDF Forms: Fill in form fields and optionally flatten them.
• Highlight PDF: Drag over text to highlight it in any colour.
• Whiteout PDF: Cover parts of a page with white boxes.
• Header & Footer: Add text, dates or page numbers to the top and bottom of pages.
• Resize Pages: Change the page size to A4, Letter, or a percentage.
• Flatten PDF: Merge form fields and annotations into the page.
• Grayscale PDF: Convert every page to black and white.
• PDF Metadata: Edit the title, author and keywords, or strip all metadata.

Secure

• Protect PDF: Encrypt a PDF with a password (AES-256).
• Unlock PDF: Remove a password from a PDF you own.
• Sign PDF: Draw, type, or upload a signature and place it on the page.
• Redact PDF: Permanently black out sensitive areas of a page.
• Compare PDF: Spot the text changes between two versions.

Optimize

• Compress PDF: Shrink file size by optimizing the PDF.
• Repair PDF: Rebuild a corrupted PDF’s structure.
• OCR PDF: Make scanned PDFs searchable with OCR.

Generate

• QR Code Generator: Turn any URL into a downloadable QR code.