Bates numbering is a sequential page-identification system used in legal proceedings: every page of a produced document set is stamped with a unique label such as DEF000001, DEF000002, and so on. The prefix identifies the producing party (DEF for defendant, CONF for confidential), and the digits are a running counter across the entire production. It is the page language of litigation — when a lawyer says "see Bates DEF000042", everyone in the case is looking at the same page.
🔒 Need it done? Stamp Bates numbers on a PDF free — 100% in your browser, no upload.
Published 19 October 2026 · Updated 19 October 2026
A Bates label has two parts. The prefix is a short text code you choose — usually three to six characters identifying the producing party or the category of documents: DEF (defendant), CONF (confidential), PROD (production set), or a matter name. The number is a zero-padded running counter: 000001, 000002, and so on, six digits being the most common width. Combined they form labels like DEF000001, CONF000874, or PROD012340. The counter does not restart between documents: the last page of file one might be DEF001200 and the first page of file two is DEF001201. That unbroken sequence across an entire production is the entire point — it makes every page in a multi-thousand-page matter uniquely citable.
Bates labels are conventionally stamped in a quiet corner of the page — bottom right or bottom center are the classics — small enough not to disturb the content, legible enough to cite in a courtroom. Because the system is convention rather than statute, any consistent scheme is accepted; courts care about uniqueness and consistency, not about a particular format.
Bates numbering is named after Edwin Granville Bates, who patented a mechanical sequential-numbering machine in the late 19th century. Law firms, courts and banks bought Bates-brand stampers for over a hundred years: each press of the machine printed the next number in sequence onto the paper. The procedure was slow, physical, and expensive — paralegals spent days stamping boxes of documents ahead of trial.
Digital Bates stamping is the same idea with the machine replaced by software. Modern e-discovery platforms apply Bates numbers during document processing, and tools like the free Bates numbering tool on this site draw the labels directly onto PDF pages. What changed is speed and cost: a production that once took days of stamping now takes seconds. What did not change is the convention — courts still expect DEF000001-style labels, still expect the counter to run unbroken across the production, and still cite pages as "Bates DEF000042".
The original and still dominant use. When parties exchange documents in litigation, every produced page gets a Bates label so both sides can cite exact pages in correspondence, motions and trial. Without it, "page 47 of the second attachment to the email chain" is a dispute waiting to happen.
Regulators and arbitral tribunals work with production sets spanning emails, scans and spreadsheets. A single Bates sequence across the whole matter gives every participant — regulator, counsel, tribunal — a shared page language for bundles running to thousands of pages.
Exhibit bundles, cross-examination bundles and closing binders all carry Bates labels so counsel can say "turn to CONF001872" and the whole courtroom lands on the same page. E-filing systems in many jurisdictions accept or expect Bates-stamped productions.
Investigation teams Bates-stamp workpaper PDFs so every reviewed page is traceable to its source document. Combined with proper redaction of privileged material, the stamped set is a defensible record of exactly what was reviewed.
Bates is not the only page-labeling system, and knowing when it is — and isn't — the right one saves real trouble. Regular page numbers restart in every document and locate a page inside that file; they cannot uniquely identify a page across a production. Watermarks (like "CONFIDENTIAL" or "DRAFT") mark status, not identity — they add no citation power. Document control numbers identify the document as a whole, while Bates labels identify each page within it. The full decision guide is here: Bates numbering vs page numbers. For a complete end-to-end workflow — sequence planning, redaction order, multi-file continuity — see How to add Bates numbers to legal documents.
Here is the uncomfortable truth about most online Bates tools: stamping is the kind of job that should never require uploading anything, yet most "free" Bates sites are built around an upload. Adobe's web tool wants an account and a subscription. Several Bates-specific sites ask you to upload the production — the confidential core of your legal matter — to their servers, then charge a per-page fee for the privilege. That architecture is backwards: sequential stamping is trivial local bookkeeping on a file you already hold, and the documents being stamped are by definition sensitive. There is no technical reason they need to travel to a stranger's server and back.
That is why the Bates tool on this page runs 100% in your browser. The stamps are drawn onto the pages with pdf-lib — the same open-source library developers trust — the document never leaves your device, there is no account, no per-page fee, and no server copy to chase down afterwards. You can verify the claim in under a minute: open your browser's network tab, drop a file, stamp it, download — you will not see a single upload. Compare that with Adobe Acrobat's web tools, which by design receive your full document first, and with freemium sites whose privacy policies describe retention windows on servers you never chose. For the other side of the same coin — how server-upload tools handle your files generally — see Are online PDF tools safe?
Bates numbering is a sequential identification system used in legal proceedings: every page of a produced document set receives a unique stamped label such as DEF000001, DEF000002, and so on. The prefix identifies the producing party or matter, and the number is a running counter across all documents in the production, letting lawyers, courts and opposing counsel cite exact pages unambiguously.
It is named after Edwin Granville Bates, who patented a mechanical numbering machine in the late 19th century. Law firms and courts used Bates-brand mechanical stampers for over a hundred years; digital Bates stamping on PDFs is the modern successor, but the name stuck.
The prefix (e.g. DEF, CONF, PROD) identifies the producing party or the category of documents — DEF for defendant, CONF for confidential material, PROD for a production set. The digits are a zero-padded running counter (000001, 000002…) that runs unbroken across every document in the production. Six digits is the most common width.
Bates numbering is not a statute, but courts, judges and discovery protocols in common-law jurisdictions routinely expect it — especially in US litigation, arbitration, and regulatory proceedings. A production without unique page identifiers is hard to cite and easy to dispute, so in practice it is close to mandatory wherever formal discovery happens.
Regular page numbers restart in every document and locate a page inside that file. Bates numbers are unique across an entire production of many documents: the counter keeps running from one file to the next, and the prefix identifies the source or party. See our full comparison: Bates numbering vs page numbers.
Yes. Our free Bates numbering tool stamps sequential labels onto every page of a PDF entirely in your browser — no account, no upload, no cost. You choose the prefix, start number, digit width and stamp position, and the document never leaves your device.
Stamping adds the Bates label to each page but does not change the underlying content — quality, text and layout are untouched. Keep an unstamped archival copy before stamping, since the label becomes a permanent part of the produced version.
Stamp sequential Bates labels on every page — stamped locally, never uploaded.
Open tool →When a simple page number is enough — and when only Bates will do.
Read the guide →End-to-end workflow: sequence planning, redaction order, verification.
Read the guide →An honest look at what server-upload tools do with your files.
Read the guide →