Bates Numbering and Watermarks Explained

Two jobs get done to a PDF just before it goes out to other people: every page gets a unique reference so it can be cited, and the document gets stamped so nobody mistakes a draft for the final version. Both are simple, and both are easy to get wrong in ways that are expensive to fix afterwards.

What Bates numbering is

Bates numbering — named after a nineteenth-century automatic stamping machine — puts a unique, sequential identifier on every page of a production. In litigation and regulatory disclosure it is what makes a document set usable: an entire deposition can turn on “turn to ABC-0004217” and everyone finds the same page.

The convention has three parts that matter:

• A prefix identifying the producing party or matter — ABC, DEF-SMITH.
• A fixed-width number, zero-padded: 0000042, not 42. Fixed width is not cosmetic. It makes filenames and references sort correctly as text, and without it page 100 sorts before page 20 in every system that touches the set.
• Continuity across the whole production, not per document. Numbering restarts at 1 for each file is the single most common mistake, and it destroys the property that makes Bates numbers worth having: uniqueness.

Two more rules learned the hard way. Put the stamp where it cannot cover content — bottom right, inside the margin, and check the pages with the densest footers. And number the set after it is final: once numbers are out with the other side, inserting a page means an awkward ABC-0004217A rather than a renumber. The page numbering tool supports a prefix and fixed-width padding for exactly this.

Ordinary page numbers

For a report or a manual you usually want something plainer: a number, possibly “page 3 of 40”, skipping the cover, sometimes starting the count at the first body page rather than the first sheet. Worth deciding before you stamp, because the difference between “numbering starts on page 1” and “numbering starts at 1 on page 3” is the difference between a tidy document and a reprint.

Watermarks: what they do and do not do

A watermark communicates status. DRAFT across a diagonal means nobody signs it by accident. CONFIDENTIAL means a page photographed on a desk still carries its classification. INTERNAL ONLY means a forwarded attachment declares itself.

Getting it right is mostly restraint:

• Legibility of the document wins. Light grey at low opacity, behind the text or over it at 10–20%. A watermark that makes the contract hard to read gets the watermark removed, not respected.
• Diagonal for status, tiled for deterrence. One large diagonal stamp reads as a label. A repeated tile is harder to crop out of a screenshot, at the cost of a busier page.
• Every page, including the cover and the annexes. The page that gets forwarded on its own is never the one you remembered to stamp.

And the part that gets misunderstood: a watermark is not security. It is drawn content in a page you have handed over, and anyone determined can remove it. It deters casual misuse and it labels status. If the requirement is that certain words never reach the reader, that is redaction, and a black rectangle is not that either. Use the watermark tool for the labelling job it is good at.

The order to do things in

1. Assemble the final set — merge and order the pages first.
2. Redact anything that must not be disclosed, and verify it is really gone.
3. Apply the watermark.
4. Bates number last, once the pagination can no longer change.

All four steps run locally in your browser. For a disclosure set — privileged material, client names, unredacted drafts in the working copy — that is not a nice-to-have.