Bates numbering guide
What is Bates stamping? A guide to Bates numbering for legal PDF documents
Bates stamping is the practice of assigning a unique identifier to every page of a document set so any page can be cited by number in court filings, discovery responses and depositions. The term comes from the Bates Manufacturing Company, whose manual numbering machines stamped sequential numbers onto paper pages starting in the late 19th century. Today, Bates numbering is applied to PDF documents electronically, but the principle is the same: every page gets one label, no two pages share a label, and the labeling can be audited after the fact.
What a Bates number looks like
A Bates number is usually a prefix followed by zero-padded digits, for example DEF-000001 or 000123. The prefix identifies the producing party or the document set (DEF for defense, PLF for plaintiff, EXH for exhibit); the padding makes every label the same length so they sort correctly in databases and file systems. A Bates number is not the same as a page number: a 10-page document may receive Bates labels DEF-000501 through DEF-000510, continuing a sequence that runs across every document in the production.
Why law firms use Bates numbering
Every page in a legal production must be identifiable without ambiguity. A lawyer citing page DEF-000347 in a motion must know that every other lawyer, judge and paralegal reading the same number sees the same page. Bates numbering provides that single source of truth across discovery, depositions, trial exhibits and appeals. Without it, parties argue about which page was produced, which version is authoritative and whether an exhibit is complete. Bates labels are the lowest common denominator of legal document reference.
Bates stamp vs Bates label vs Bates number
Bates number is the identifier itself (DEF-000347). Bates stamp is the visible mark printed on the page, usually in a header or footer corner. Bates label can mean either the visible mark or the PDF navigation label shown by viewers like Acrobat in the page sidebar. A complete Bates workflow writes all three consistently: the visible mark, the navigation label and the machine-readable mapping from label to source page.
How to plan Bates number ranges without collisions
Before stamping any file, count every page in the production order and build one assignment table that maps each source file to its Bates range. A continuous sequence advances through file boundaries; a per-section sequence restarts with a distinct prefix for Discovery, Exhibits or Privileged material. The collision key is the final visible label, so two sections can reuse numeric values only if their prefixes keep the full labels unique. Detect overflows before writing: if a value exceeds the chosen padding, increase the padding or revise the start instead of silently widening the label after preview.
How to add Bates numbers to PDF documents on Mac
Keep every original PDF unchanged and work on copies. Record a SHA-256 hash for each source so the plan is tied to bytes, not a mutable filename. Choose a numbering rule (prefix, padding, starting value, continuous or per-section). Preview the placement inside each page's CropBox, because legal productions mix Letter, A4, portrait and landscape pages. Run preflight to block duplicate source hashes, labels assigned to multiple pages and numbers that exceed the padding. Export the stamped copies and verify each one against the source hash.
What a Bates numbering receipt should contain
A useful receipt maps source order, source filename, source SHA-256, page number and assigned Bates label in CSV and JSON, omitting absolute paths so the receipt can be shared without leaking usernames or folder structures. It includes output PDF checksums and a human-readable summary. No receipt is a legal certificate of court sufficiency, but together the layers make the technical operation inspectable and repeatable, which is exactly what opposing counsel and the court expect.
Common Bates numbering mistakes
Stamping the original file instead of a copy destroys the source; always write to separate output files. Restarting a sequence without a distinct prefix produces duplicate labels that are hard to detect in a large batch. Applying one fixed stamp coordinate to every page places the label off-page on smaller or rotated pages; calculate placement inside each CropBox instead. Skipping the post-export verification means a stamp failure or a changed source goes unnoticed until opposing counsel raises it in a motion.