Add Bookmarks to PDF - Free Online Tool

Automatically generate bookmarks and outlines for your PDF documents. Create a professional table of contents from headings for easy navigation.

Max file size: 50MB. Supported: All PDF documents

Bookmark Generation Options

What does this option do?

This controls which heading levels are detected and converted to bookmarks:

  • All Headings: Creates a comprehensive table of contents with all heading levels
  • H1 Only: Only detects main chapter/section titles (largest headings)
  • H1 and H2: Creates a standard table of contents with main and sub-sections
  • H1, H2 and H3: Detailed navigation with multiple levels (recommended)

Understanding Bookmark Depth

This controls how many nested levels of bookmarks are created:

  • 1 Level: All bookmarks appear at the top level (flat structure)
  • 2 Levels: Main sections and immediate sub-sections
  • 3 Levels: Standard hierarchy with main, sub, and sub-sub sections
  • 4+ Levels: Detailed multi-level navigation for complex documents

For most documents, 3 levels provides the best balance of simplicity and detail.

Font Size Detection

This setting helps the tool identify headings based on their font size:

  • Auto-detect: Automatically determines optimal size thresholds (recommended)
  • 10pt+: Includes very small text that might be headings
  • 14pt+: Typical for normal document headings
  • 18pt+: Only very large text (chapter titles, main headings)

Use "Auto-detect" for best results in most cases.

Pro Tip

For best results, use PDFs that were created from word processors (Word, Google Docs, etc.) rather than scanned documents. The tool works best with text-based PDFs that have proper heading structure.

How Our PDF Bookmark Generator Works

Step-by-Step Process

  1. Upload Your PDF: Select any PDF document from your device
  2. Automatic Analysis: Our tool scans your document for heading structures
  3. Smart Detection: Identifies headings based on font size, style, and formatting
  4. Bookmark Creation: Generates a hierarchical bookmark structure
  5. Instant Download: Receive your enhanced PDF with navigation bookmarks

Ideal For These Document Types:

Benefits of Adding Bookmarks to PDFs

Enhanced Navigation

Quickly jump to any section without scrolling through pages. Perfect for long documents.

Time Saving

Reduce time spent searching for specific content within your documents.

Professional Appearance

Add a polished, professional look to your documents with proper navigation.

Mobile Friendly

Easily navigate documents on mobile devices where scrolling is more challenging.

Frequently Asked Questions

Q: What types of PDFs work best with this tool?

A: Text-based PDFs created from word processors (Microsoft Word, Google Docs, etc.) work best. Scanned PDFs may require OCR processing first.

Q: Will this tool work with scanned PDFs?

A: For scanned PDFs, we recommend using our OCR tool first to convert them to text-based PDFs for optimal results.

Q: Is there a file size limit?

A: Yes, the current file size limit is 50MB per document. For larger files, consider splitting them into smaller sections.

Q: Are my files secure?

A: Absolutely. All files are processed securely and automatically deleted from our servers after processing.