How to Do Bates Numbering: A Step-by-Step Guide for Legal Documents

As a case file grows thicker, sooner or later everyone runs into the question: "which page, in which folder, was this document on?" Bates numbering exists precisely to prevent that confusion: it's a simple but powerful method, used by the legal profession for decades, that ties even a evidence set spanning thousands of pages to a single reference system.

In this article, we'll explain what Bates numbering is for, how to choose the right format, and how to apply it step by step using an online tool.

What Is Bates Numbering, and Why Does It Matter?

A Bates number is a unique identifier added to every page in a document set, typically made up of a letter prefix and sequential digits (for example, ABC-000123). It takes its name from Edwin G. Bates, who invented the numbering machine used for this purpose in the 19th century.

In practice, it's useful for:

• Evidence tracking: Saying "ABC-000047" instead of "page 47" pins down exactly which document is being referenced.
• Hearing references: When the opposing party, a judge, or an expert witness refers to a document, they speak in terms of its number, and that reference stays fixed even if the physical page count changes.
• Proof of integrity: Gaps in the numbering reveal whether pages were later added to the document set.
• Combining multiple files: Hundreds of PDFs from different sources can be organized under a single sequential numbering flow.

In short, a Bates number makes a document "findable." Especially during discovery, in exhibit files, and in witness statements, working without this kind of numbering becomes nearly impossible.

Before You Start: Deciding on a Format

Before you begin numbering, you need to make three basic decisions. Changing these decisions later — especially once the numbers have started being used as references somewhere — creates serious headaches.

1. Choosing a Prefix

The prefix usually identifies the party or the file: PLA (plaintiff), DEF (defense), a client abbreviation, or a case number. Choose a prefix that's short, unambiguous, and won't cause confusion. If two different parties in the same case use prefixes that both start with the same letter (for example, "Plaintiff" and "Defense Exhibits" both starting with "D"), it becomes hard to tell them apart later.

2. Digit Count

How many digits the numbers should have needs to be decided based on the total document volume. 6 digits (000001) is plenty for a 500-page file but may fall short for a 50,000-page case file. Starting wide is much easier than renumbering later.

3. Placement of the Number

Standard practice is to place the number in the bottom-right corner of the page. The reason is simple: in most documents, text doesn't extend into this area, so the number doesn't overlap existing content. Unless you have a good reason not to, don't break this convention — the opposing party and the court are used to this placement.

Step-by-Step Bates Numbering

The steps below apply to numbering a single PDF or multiple documents in sequence using an online Bates numbering tool.

Step 1: Prepare the Documents in the Correct Order

Before numbering, pay attention to the order in which you upload the files. The tool numbers documents in whatever order you upload them. Decide in advance whether you'll proceed chronologically, by party, or by subject, and name your files accordingly (for example, 01_filing.pdf, 02_exhibits.pdf) — this reduces the risk of making a mistake during upload.

Step 2: Upload the PDFs to the Tool

You can upload a single file, or select and upload multiple PDFs at once. When you do a multi-file upload, the tool processes the files sequentially under a single number flow; meaning if the first file's last page ends at 000145, the second file continues from 000146.

Step 3: Enter the Prefix and Starting Number

Enter the prefix you've decided on (for example, CLI-) and the starting number (usually 000001). If this is a continuation file and the previous set ended at 004582, remember to start the new set at 004583 — that way the number chain continues without a gap.

Step 4: Set the Digit Count and Formatting

Decide how many digits you want the numbers to have (6 digits is a common choice) and any additional formatting options (font size, weight) if available. Make sure the number is legible but small enough not to clash with the document's content.

Step 5: Choose the Position

The bottom-right corner of the page is the default and recommended position. If this area is already filled with existing content in your documents (as happens with some form documents), you can switch to an alternative position like the bottom-left corner — but stay consistent across the whole set.

Step 6: Check the Preview

Before applying the numbering, check at least a few pages in the preview. Look at whether the number overlaps existing text, whether it's legible, and whether it starts at the right sequence. Skipping this step can mean having to start over after numbering hundreds of pages.

Step 7: Run the Process and Download the Results

Once everything looks correct, start the numbering process. When it's finished, download the numbered PDFs. If you uploaded multiple files, each one can come out separately with its own Bates range, or as a single combined file — choose based on your needs.

Step 8: Log the Number Ranges

This last step is often skipped but is important: note down which Bates range each file covers (for example, "Exhibit-3.pdf → CLI-000146 through CLI-000289") in a table. As the case file grows, this log becomes the fastest way to find documents again.

Common Mistakes

Making the digit count too narrow. A 4-digit format (0001–9999) falls short for files exceeding 10,000 pages and requires renumbering. When in doubt, go wider.

Using inconsistent prefixes within the same case. If different teams, or people working at different times, apply different prefix rules, the number set becomes a mess. Put the prefix rule in writing from the start.

Not checking page order before numbering. In scanned documents, page order can sometimes be jumbled (pages scanned upside down, missing pages). Numbering stamps the existing order as-is; so if there's an ordering error, the numbers get printed in the wrong order too.

Overwriting the original file. Always save the numbered output as a separate file, and keep the original, unnumbered document on hand as well. If a page quality issue or content dispute comes up later, you need to be able to go back to the original.

Numbers overlapping existing content. In some documents, the footer area is already occupied — by a page number, a date stamp, and so on. Before adding the Bates number, make sure these areas are empty; otherwise the two pieces of information collide and become illegible.

Conclusion

Although Bates numbering may look like a small formatting step on the surface, it's a process that directly affects how manageable a case file is. Making the right format decisions from the start, carefully preparing the ordering, and logging the ranges after numbering prevents a lot of confusion down the road. With an online tool, this process can be completed in a few minutes, with no installation required.