Bates numbering is the habit that makes litigation documents citable: one unique, sequential identifier per page across an entire production, so "SMITH-000117" points at exactly one piece of paper, forever. The mechanics are simple — but the conventions (digit width, continuity, placement, resuming a second batch) are where people mess it up. Here's the whole picture, plus how to stamp without uploading a single confidential byte.
The name comes from the Bates Manufacturing Company's hand-cranked numbering stamp, patented in the 1890s — press, advance, press, advance. Law firms adopted it instantly, and even though the ink stamp is a museum piece, the convention survived the move to PDF: a prefix, a zero-padded counter, optionally a suffix, applied to every page of a document set before production, so depositions, briefs, and discovery responses can cite pages without ambiguity. Beyond litigation, the same technique labels audit workpapers, FOIA releases, insurance claims, and due-diligence data rooms — anywhere "which exact page?" needs a one-word answer.
| Component | Convention | Examples |
|---|---|---|
| Prefix | 3–6 characters tied to party or matter, often hyphen-terminated | SMITH-, DEF-, ACME-PROD- |
| Counter | Fixed-width, zero-padded; 6 digits typical (999,999 numbers), 7 conservative | 000042 |
| Suffix | Set identifier or privilege tag | -P (privilege), -A (set A), -RESP |
The one hard rule: the width must not change mid-production. Six-digit numbers sort correctly next to each other; mix in a seven-digit number and file listings break. Pick the width for your largest plausible production on day one.
Continuously, in the order the files sit in the production. Say you're producing a 24-page contract, a 12-page email thread, and a 9-page expert report, starting at 101 with prefix SMITH-: the contract takes SMITH-000101 through SMITH-000124, the email thread SMITH-000125 through SMITH-000136, and the report SMITH-000137 through SMITH-000145. Total pages 24 + 12 + 9 = 45, last number 100 + 45 = SMITH-000145. When the next batch goes out, it starts at 146 so the sequence never repeats a number. Tools that number each file from 1 independently are producing page labels, not Bates numbers — that's the most common mistake in the genre.
No rule fixes the spot; consistency and legibility are the whole game. Bottom-right is the most common default on letter-size documents, bottom-center a close second, with top-right favored when footers are crowded. Keep the number inside the margin — half an inch (36 points) from the edge clears binder holes, staple zones, and most existing footer text — and use a modest type size: 9 pt Helvetica is plenty and reads cleanly in scans. One caution: don't stamp over content in a way that obscures it; if a page's footer is dense, shift the whole set to top-right rather than moving the stamp on individual pages.
Three routes, same trust question as every document tool:
Whichever route you take, stamp after assembling the final page order — merging, splitting, or reordering afterward invalidates the sequence. The practical pipeline is: merge or arrange pages into production order, then stamp once.
Yes. The stamp is drawn on top of the page image just as a physical stamp would sit on paper — but because it's added as a text object rather than burned into the scan, it stays sharp at any zoom and remains searchable. That's a real advantage over legacy TIFF workflows, where the "stamp" was rasterized into the image. If you're producing scans, run OCR before or after stamping (your OCR tool handles overlaid text fine), and keep the stamp out of the OCR text layer's way by choosing a standard position.
Queue files, see first/last stamp, download numbered copies. Runs entirely in your browser.
Stamp PDFs Now →Pick a prefix and a six-or-seven-digit width, number continuously across the whole production in order, stamp consistently inside the margin, and resume the next batch at the next number. And keep the operation on hardware you control — a browser-based stamper gives you desktop-grade privacy at web-tool convenience. This is a utility workflow, not legal advice: where a case order or protective order specifies a format, that order wins.
Yes. A browser-based stamper like ToolAspect's Bates Numbering tool runs pdf-lib locally: files are read into memory, stamped, and returned as downloads with zero uploads. That matters here more than almost anywhere — Bates-numbered sets are typically the confidential kind (medical records, trade secrets, personnel files), and upload-based services put a copy on someone else's server.
Yes — that's the point. The sequence must be unique across the entire production, not just within each file, so every page has exactly one identifier and every citation resolves to exactly one page. If a 24-page, 12-page, and 9-page document are produced together starting at SMITH-000101, the last page is SMITH-000145, and the next production resumes at SMITH-000146.
The standard shape is a short prefix tied to the party or matter, a fixed-width zero-padded counter, and an optional suffix: SMITH-000101-P. Six digits (capacity 999,999 pages) is the common width; seven is the conservative choice for large matters. Whatever you pick, keep the width constant across the whole set — 00042 next to 100042 breaks sort order and looks sloppy.
A proper stamper never touches your original: it writes the number onto an in-memory copy and gives you that copy as a new download. The number itself is added as a text object, so it stays selectable and searchable — typing SMITH-000117 into any PDF reader jumps straight to that page.