Bates Numbering Done Right: The Complete Guide for Law Firms

Your team is about to send the first production in a matter, or you have inherited a file where three people stamped documents three different ways and nobody can say which pages went out on which date. Bates numbering is the system that prevents that mess: every page the firm produces gets one permanent, unique identifier that anyone in the case can cite.

This guide covers the conventions that hold up over the life of a matter: how to design prefixes and number widths, how to sequence multiple productions, what to do with native files and withheld documents, how Bates numbers relate to exhibit numbers, and the mistakes that cause disputes later. It ends with a short procedure your team can adapt. For the click-by-click mechanics inside a PDF editor, see the companion guide on how to Bates stamp PDFs.

What is Bates numbering and why do firms use it?

Bates numbering is the practice of marking each page of a document set with a sequential identifier, typically a short prefix followed by a fixed-width number, so every page can be located and cited without ambiguity. The name comes from the Bates numbering machine, a mechanical hand stamp that advanced one number with each impression. The stamp is now applied electronically, but the purpose has not changed.

A clean Bates sequence does several jobs at once:

• Citation. Deposition questions, motions and witness outlines can point to ACME_000214 instead of “the third page of the March bank statement.”
• Proof of production. The production log shows which ranges went to whom and when, which matters if the other side later says it never received something.
• Privilege and redaction tracking. Withheld and redacted pages can be identified and logged by number.
• Exhibit traceability. When a produced page becomes a hearing exhibit, its Bates number ties it back to the production it came from.

What does a good Bates number look like?

A good Bates number is short, consistent and sortable: a prefix that identifies the producing party, then a zero-padded number of fixed width. Everything else is a local choice, but it should be decided once per matter and written down.

Choosing the prefix

Prefixes usually identify the producing party rather than the matter, because the same documents can resurface in related proceedings. Keep prefixes free of sensitive information. In family matters especially, avoid a child’s name or the client’s full name: the stamp appears on every page that leaves the office and may end up in a public court file. Party-role or neutral abbreviations avoid that problem.

Choosing the width

Pick a width large enough for the largest volume the matter could plausibly reach, then never change it. Fixed width matters because file systems and review tools often sort text, and unpadded numbers sort out of order (page 10 lands before page 2). Padding also makes ranges easier to read in a privilege log or cover letter.

Numbering across volumes

Numbers continue across productions. If Volume 1 ends at ACME_0000412, Volume 2 begins at ACME_0000413. Restarting at 0000001 with each production creates duplicate identifiers and is one of the most common sources of confusion in later depositions.

How should Bates numbers be assigned across productions?

Assign numbers as the last step before production, after review, privilege calls and redactions are final, and log each range the day it is stamped. A predictable sequence looks like this:

1. Agree on the format early. In federal cases, the Rule 26(f) conference and any ESI protocol are the natural place to settle prefixes, width, stamp placement, and how natives and withheld documents will be handled. The ESI meet-and-confer checklist covers the related items.
2. Assign one range owner. One person or one system issues the next starting number for each prefix, so two staff members never stamp overlapping ranges.
3. Finalize the set. Complete review, privilege designations, redactions and confidentiality designations before stamping. Every change after stamping invites renumbering.
4. Stamp working copies, never originals. Keep unstamped source files untouched in their own folder.
5. Quality-check the output. Confirm first and last numbers against the page count, legibility, and that no stamp covers text.
6. Log and hash. Record the range, page count, date, recipient, delivery method, and a hash value for each production file so you can later show exactly what was sent.
7. Send with a cover letter listing ranges. The letter becomes part of your proof of production.

How do you handle natives, attachments and withheld documents?

Natives, attachment families and withheld pages are where Bates sequences most often break, so decide the handling rule in advance and apply it consistently.

Native files

Spreadsheets, audio, video and some databases are often produced natively because a static image would lose information such as formulas, hidden columns or playback. The usual convention is one Bates number per native file, a single placeholder page (a slipsheet) bearing that number and a note such as “Document produced in native format,” and the native file renamed to its Bates number plus any confidentiality designation. The slipsheet keeps the image sequence continuous.

Parent and attachment families

An email and its attachments should occupy a contiguous range, parent first. If the production includes load files, the beginning and ending attachment fields record the family range. The guide to PDF, native and load-file production formats covers when load files are worth the effort.

Withheld and redacted material

Rule 26(b)(5)(A) requires a party withholding otherwise discoverable information as privileged to make the claim expressly and describe what is withheld. Two conventions are common: a slipsheet reading “Withheld – Privileged” that consumes the number, or pulling the document before numbering and identifying it in the log by a control number. Either works if it is consistent. Redacted pages keep their Bates numbers, with a visible redaction label. The privilege log guide covers the log itself.

What is the difference between Bates numbers, exhibit numbers and control numbers?

Bates numbers identify pages as produced; exhibit numbers identify items as offered at a deposition, hearing or trial; control numbers track items internally before anything is produced. Mixing them up is a common source of confusion in hearing binders.

Keep the Bates number visible on any page that becomes an exhibit. When the same document appears as Deposition Exhibit 4 and Hearing Exhibit 17, the Bates number is often the only thing that lets a reader confirm it is the same page. Courts differ on exhibit-marking conventions (numbers versus letters, party prefixes, pre-marking), so check local rules and the judge’s standing orders.

What goes wrong with Bates numbering?

Most Bates problems come from doing the right thing at the wrong time: stamping before review is final, letting two people number at once, or “fixing” a mistake by renumbering pages that have already left the office.

• Duplicate numbers. Usually from restarting at 0000001 or simultaneous stamping. Fix with a corrective production and a letter explaining which set controls.
• Unexplained gaps. A missing range looks like withheld documents. Account for every skipped number in the log.
• Renumbering produced pages. Once a page has a number in someone else’s hands, that number belongs to that page. Corrections get new numbers or a documented suffix, never a reshuffle.
• Stamps covering content. A stamp over text, a signature or a timestamp creates an argument you do not need.
• Your prefix on their documents. Documents received from another party keep their original numbers. If they arrived unnumbered, use a clearly separate prefix and note it in the log.
• Message threads split into fragments. A text thread produced as hundreds of loose screenshots is hard to cite. A paginated, chronological log with one continuous range is easier for everyone.

For message evidence, a tool like Message Extractor can turn common phone and app exports into a chronological, paginated PDF log with Bates-style numbering and an automated index, so a long thread lands in one citable range. See how the message log export works.

A firm Bates procedure you can adapt

Write the rules down once and keep them in the matter file. A one-page procedure keeps paralegals, associates and contract reviewers stamping the same way.

• Prefix and width recorded in the matter file and any ESI protocol
• One owner for the next available number
• Unstamped originals preserved and hashed
• First and last numbers verified against the page count
• No stamp covering content on any page
• Production log updated the same day
• Cover letter lists every range produced

Formatting conventions are only part of the picture. Rules on production form, confidentiality designations and exhibit marking vary by court, so the responsible attorney, licensed where the matter is pending, should confirm the approach against the local rules and any orders before the first production goes out.