Scanned PDFs often lack a table of contents. Instead of buying expensive PDF software, use these Linux/Mac commands:

# Install pdftk (on Mac)

brew install pdftk-java

# Extract metadata

pdftk input.pdf dump_data_utf8 > metadata.txt

Open metadata.txt in your editor and add bookmark locations in this format:

... blog.yostos.org https://blog.yostos.org/2025/01/11/scanned-pdfs-often-lack-a.html