Are NanoTools completely free to use?

Yes, all basic tools on NanoTools are completely free to use with no registration required. We offer premium features for power users.

Is my data secure when using NanoTools?

Your files are processed securely and are automatically deleted after processing. We do not store your files or data on our servers.

No installation required. All tools work directly in your browser on any device - computer, tablet, or smartphone.

We support a wide range of formats including PDF, JPG, PNG, WebP, GIF, JSON, XML, CSV, and many more depending on the tool.

Edit PDF bookmarks online for free. Create and manage table of contents. Organize PDF navigation structure.

Drop PDF file here or click to browse

.pdf, application/pdf • Max 50MB

1
Upload PDF file
Select the document you want to add or edit bookmarks
2
View bookmark hierarchy
See existing bookmarks and their page links
3
Add or edit bookmarks
Create new bookmarks, modify titles, or auto-generate from headings
4
Save PDF
Download the PDF with updated bookmark structure

1

Select the document you want to add or edit bookmarks

2

See existing bookmarks and their page links

3

Create new bookmarks, modify titles, or auto-generate from headings

4

Download the PDF with updated bookmark structure

Bookmarks are clickable navigation links in PDF readers. Table of contents is actual page content listing sections.

Yes, you can create nested bookmark hierarchies with parent and child bookmarks.

Auto-generation works best with PDFs that have styled headings or structured content.

Yes, bookmarks are a standard PDF feature visible in most modern PDF readers.