If you have ever worked on a lawsuit, you have probably seen a small code in the corner of every page, something like SMITH000123. That code is a Bates number. This article answers a simple question: what is Bates numbering, and why does it matter? It also covers how the numbers are built and the mistakes that cause trouble later. It is general information, so always follow your court's rules and any agreement with the other side.
The Short Answer
Bates numbering is a way of giving every page in a set of documents its own number. The numbers run in order, and no two pages share one. When thousands of pages change hands in a case, everyone can point to the exact same page by its number.
The name comes from the Bates Automatic Numbering Machine, a hand stamp from the late 1800s that printed a new number each time it was pressed. Today the numbers are almost always added by software, but the idea has not changed.
Why Lawyers Use It
In discovery, each side hands documents over to the other, and a single case can involve tens of thousands of pages. Without a number on each page, it is hard to say which page you mean and easy to lose track of what was sent. Bates numbers help a legal team:
- Find any page quickly, even in a very large set
- Prove exactly what was produced, and when
- Refer to pages clearly in depositions, motions, and at trial
- Spot missing or repeated pages before they cause a dispute
Bates Numbers vs. Ordinary Page Numbers
Ordinary page numbers restart in every document, so page 3 of a letter and page 3 of a contract look exactly the same once both are part of a production. Bates numbers keep counting across every document in the set, which means each page carries an identifier that no other page in the case can share.
That difference matters most when documents are printed, split apart, or attached to court filings, because a page that drifts away from its original file can still be traced back to the exact place it came from.
How a Bates Number Is Built
Most Bates numbers have two parts: a short prefix and a page number padded with zeros. The prefix usually names the party or the case. The zeros keep every number the same length, so the pages sort in the right order.
| Part | Example | What It Does |
|---|---|---|
| Prefix | SMITH | Shows who produced the page |
| Page number | 000123 | Gives the page its place in the set |
| Full Bates number | SMITH000123 | The label printed on the page |
| Bates range | SMITH000100 to SMITH000150 | Describes a whole document |
How to Add Bates Numbers Step by Step
- Agree on the format first, checking court rules and any agreement with opposing counsel.
- Finish the set before numbering, since adding pages later breaks the order.
- Pick a clear prefix and enough zeros for the largest set you expect.
- Stamp every page, including blank pages and attachments.
- Keep a production log listing each range, the date, and who received it.
- Save a stamped copy of exactly what went out, separate from the originals.
Mistakes That Cause Trouble
Most problems come from changing a set after the numbers are added. If a page is removed, there is a gap in the sequence, and if one is added, two pages may end up with the same number. Either way, the other side may start asking whether something was hidden.
Another common mistake is stamping the original files instead of a copy. Always number a copy and keep the originals untouched, so the firm has a clean version for its own records.
A Common Scenario
A small litigation team produces 4,000 pages in a contract dispute. Months later, the other side claims an important email was never sent. Because every page carries a Bates number and the team kept a production log, a paralegal finds the email at SMITH002311 within minutes, along with the date it went out. Without the numbers, the team would be digging through folders and old emails to prove what they produced.
Where Software Fits In
Most PDF tools can add Bates numbers, so the stamping itself is the easy part. The harder part is keeping the stamped production sets, the production log, and the clean originals together in the right matter. DocuStacker keeps each matter's papers in one place with earlier versions saved, so a stamped set and its originals sit side by side. Read more about how DocuStacker works for law firms, or see how law firms can organize case documents.
The Bottom Line
What is Bates numbering? It is a simple system that gives every page in a document set its own number, so everyone in a case can find, cite, and account for the same page. Agree on the format, number a finished copy, stamp every page, and keep a log of what went out.
