What is Bates Numbering? A complete guide for legal discovery

What Bates numbering is

Bates numbering — sometimes called Bates stamping or Bates labeling — is the practice of placing a unique, sequential identifier on every page of a document. The identifier usually looks like SMITH_v_JONES_000001, with three parts: a prefix that names the case or batch, a zero-padded sequence number, and sometimes a suffix flag such as CONFIDENTIAL.

Once a document has been Bates-stamped, every page has a unique address. A lawyer can ask a deponent to "turn to page SMITH_v_JONES_000847" and there is no ambiguity about which page they mean — even when the document has been copied, re-paginated, and entered into evidence by half a dozen different people across half a dozen different firms.

A short history of the Bates stamp

The practice is named after Edwin G. Bates, a Brooklyn inventor who patented a hand-operated, self-advancing numbering stamp in 1891. His "Bates Numbering Machine" was a mechanical marvel: each press of the stamp inked the page and clicked the counter forward by one. Law firms, banks, and insurance companies bought them by the thousands.

For roughly a century, Bates stamping was a physical act. A paralegal would sit at a table with a stack of documents and a Bates machine, thumping each page once. The mechanical stamp survived well into the 1990s. Today, those original devices are collector's items, but the naming convention they created is more important than ever — every modern e-discovery platform still produces Bates-numbered output, and the format has barely changed in a century.

Where Bates numbering is used today

Bates numbering is required, expected, or simply best practice in many professional contexts:

• Civil litigation. In US federal and state courts, document productions are almost always Bates-stamped before being exchanged between parties. Many international jurisdictions follow the same convention.
• M&A due diligence. Acquirers' counsel typically demand Bates-numbered VDR exports to track exactly which version of which document they reviewed.
• Internal investigations. Investigations of harassment, discrimination, or fraud generate document collections that need stable, citable references over months or years.
• Audits and regulatory filings. Financial and healthcare audits often require every page of evidence to carry a unique identifier.
• Government records requests. FOIA, GDPR access requests, and equivalent state-level requests produce Bates-numbered response packages.

If your work involves saying "see page 47 of the third folder" to anyone outside your own desk, Bates numbering is the standard answer.

Anatomy of a Bates stamp

A modern Bates stamp has up to four parts:

1. Prefix — names the case, party, or batch. Examples: SMITH_v_JONES_, ABC_, PROD_001_.
2. Sequence number — zero-padded so values sort correctly in any file system. Examples: 000001, 000002, ... 999999.
3. Suffix — optional flag, usually CONFIDENTIAL, ATTORNEY_EYES_ONLY, or DRAFT.
4. Position and styling — bottom-right is the dominant convention, but courts and firms vary. Black 10pt Helvetica is the safest default.

How to choose your Bates format

A few rules of thumb:

• Pad to six digits unless you genuinely expect more than 999,999 pages. Six is the legal default. It sorts correctly in any file system and is what opposing counsel will expect.
• Use a prefix that names the matter, not the date. SMITH_v_JONES_ tells you what the document is. 2026_05_23_ tells you when you stamped it — useful for nothing.
• Reserve suffixes for confidentiality flags. Don't mix CONFIDENTIAL with batch labels. The page's confidentiality status should be visually obvious at a glance.
• Pick a corner and stick with it. Bottom-right is conventional. Switching position partway through a production looks careless, and tools that index Bates numbers may struggle to find them.
• Black on white at 10pt. Color makes the stamp stand out — usually a bad thing in legal contexts, where the stamp should support the document, not compete with it.

Common mistakes to avoid

• Restamping originals. Once a document has been produced with Bates numbers, those numbers are part of the record. Producing a "corrected" version with new numbers creates two documents referencing the same content with different addresses. Always work from a copy.
• Inconsistent prefixes across batches. ABC_000001 in one folder and ABC_PROD_000001 in another forces opposing counsel to maintain a translation table. Decide your prefix scheme before you start stamping.
• Overlapping with page content. A 28-point safe margin from the page edge is enough to clear most footers. Stamps placed too close to the edge collide with footnotes, page numbers, or court letterhead.
• Forgetting to verify final output. Always open the stamped PDF and spot-check the first, middle, and last pages before delivery. A mis-set start number or wrong prefix discovered after production is expensive to fix.
• Stamping privileged documents by accident. Run privilege review before Bates stamping, not after. A Bates-numbered privileged document that escapes into a production is much harder to claw back than an un-numbered one.

Stamp a PDF in three steps

Bates-stamping a PDF using PdfDocShift takes three steps and runs entirely in your browser — no installation, no sign-up, and every file is deleted from our servers after two hours.

Managing Bates numbering across batches

A single production rarely arrives as one tidy PDF. Most matters generate dozens of batches over weeks or months, and managing the numbering across them is a discipline of its own:

• Maintain a Bates log. A simple spreadsheet that records prefix, start number, end number, page count, date stamped, and source folder for every batch you produce. When opposing counsel asks where a specific number came from, the answer should take ten seconds.
• Number batches sequentially. If batch one ended at 002,500, batch two starts at 002,501 — not at 002,600 with a gap, and not at 003,000 with a round number. Gaps invite questions.
• Reserve a block for late additions. If you stamp 50,000 pages and then receive 200 more relevant documents the next week, you do not want to give them a different prefix. Reserve a range up front (e.g. start your main production at 010,001 so the first 10,000 numbers are available for supplemental productions later).
• Document any re-Bates. If you absolutely must re-stamp a previously produced document — for example because the original numbering was corrupted — record the original Bates range, the new Bates range, and the reason in your privilege log, and notify opposing counsel in writing.

Frequently asked questions