How to Add Bates Numbering to PDF Documents

What This PDF Security Guide Covers

This guide was written and tested by Rachel Okafor, a Information Security & Compliance Consultant with 8 years of hands-on experience in document security, encryption, digital signatures, HIPAA compliance. Rachel has 8 years of experience in document security, previously serving as a compliance officer at a healthcare organization.

Bates numbering — a unique, sequential identifier stamped on every page of a legal document set — is the backbone of legal document management. During discovery, each page of every document receives a Bates number that allows attorneys, paralegals, and courts to reference specific pages precisely. A typical Bates number combines a prefix (case number or party identifier), a sequential number, and optionally a suffix.

This guide covers four methods for adding Bates numbering to PDF documents. We tested each on single documents and multi-file document sets to evaluate numbering accuracy, prefix flexibility, and output organization.

Time to read: 5-7 minutes | Difficulty: Beginner to Intermediate | Last updated: 2026-07-14

Why Document Security Cannot Be an Afterthought

Bates numbering evolved from physical stamps used in law offices — a rotating mechanical stamper that printed 'BATES' plus a sequential number on each page. Digital Bates numbering replicates this with customizable prefixes (case IDs, producing party names), sequential numbers (starting from any value), and often suffixes (document type codes). The numbering must be consistent across all documents in a production set, without gaps or duplicates.

Beyond legal use, Bates numbering is valuable for any large document collection needing unique page identification: medical records, insurance claims, regulatory submissions, and audit documents. The key difference from page numbering is that Bates numbers are unique across all pages, not resetting per document.

Securing the PDF Step by Step with a Desktop Editor

📋 Quick Recap of the Security Steps

Print this box or keep it open while you work through the tutorial.

1. 1Launch your desktop PDF editor and open the Bates numbering tool. Add all PDF files that need numbering — you can drag and drop fi…
2. 2Set the Bates number format: enter a prefix (e.g., 'Acme_Corp_00001'), choose the starting number, and optionally a suffix. Set th…
3. 3Preview the Bates numbers on a sample page to verify format, font, size, and position. Adjust if needed. Click Apply or Run. The t…
4. 4Open the first few files and last file of the set. Verify: the first page of the first file has the correct starting number, the l…
5. 5Save each Bates-numbered file individually. Create a numbering log that records: the prefix used, the starting and ending numbers,…

Free Ways to Protect a PDF (and Their Limits)

No desktop editor installed? Here are free alternatives — we list their limitations honestly.

Method 1: Adobe Acrobat Pro (Paid)

Tools → Edit PDF → More → Bates Numbering → Add. Processes multiple files with sequential numbering. Limitation: requires Acrobat Pro (subscription); limited custom formatting options.

Method 2: LibreOffice Draw (Free, Manual)

Add text boxes with sequential numbers manually on each page. Limitation: manual numbering across multiple files is error-prone; no automatic sequencing; time-intensive for large document sets.

Method 3: Excel + Mail Merge (Free, Complex)

Generate a list of Bates numbers in Excel, use Word mail merge to create number overlays, apply to PDF pages manually. Limitation: complex multistep process; scales poorly to large document sets; positioning accuracy is limited.

Security Features Compared: Free vs. Desktop Editor

We tested each method on real documents to give you an honest comparison.

Verdict: For basic password protection, Preview or LibreOffice work. For certified redaction and digital signatures, a desktop editor is essential.

Why Desktop Editors Handle Bates Numbering Better

Desktop PDF editors provide a dedicated Bates numbering tool that applies sequential numbers across multiple PDF files simultaneously. It supports: custom prefixes and suffixes, configurable starting number, page-range selection within each document, and numbering across document sets. The tool places Bates numbers as crisp text objects at configurable positions on each page.

Online tools cannot batch-process multiple PDFs for sequential Bates numbering — they process one file at a time, meaning you must manually track and set the starting number for each file. Online processing also requires uploading all documents to a server, which is unacceptable for legal discovery documents. See the full comparison →