What Is Bates Numbering? A Guide for Legal Document Management

The Basic Idea

Bates numbering stamps a unique, sequential identifier onto every page of a document collection — typically a short prefix followed by a zero-padded number, like SMITH-000001. Every page gets exactly one number, in order, across the entire set. Once applied, that number becomes the permanent way to refer to that specific page, regardless of what the document itself is called or where it later gets filed.

Where the Name Comes From

The technique is named after Edwin G. Bates, an American inventor who developed an automatic numbering stamp machine in the late 19th century, patented and manufactured through the Bates Manufacturing Company. The mechanical stamp automatically advanced to the next number each time it was pressed, making it far faster than numbering pages by hand. Legal teams adopted these machines for numbering case documents, and the name stuck — "Bates numbering" and "Bates stamping" remain the standard terms across the legal industry today, long after the original mechanical stamps were replaced by digital tools.

Why It Matters

• Unambiguous reference: "page SMITH-000047" refers to exactly one specific page, with no confusion possible about which document or version.
• Tracking through litigation: as documents move through discovery, depositions, and trial, the same Bates number consistently identifies the same page throughout the entire case.
• Citation in filings: briefs, exhibits, and court filings can cite an exact page by its Bates number, rather than a vaguer description.
• Confirming completeness: a continuous, gap-free sequence helps confirm a full production was received, since a missing number in the sequence is immediately noticeable.

Beyond Litigation

While most closely associated with litigation and discovery, the same numbering approach is useful anywhere a large set of documents needs stable, unambiguous page-level references — regulatory filings, large contract sets, or internal document audits, for instance.