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To add sequential serial numbers to PDF pages in a batch, use Bates numbering in Adobe Acrobat Pro. This guide covers visible, page-level Bates identifiers; “serial number” can also mean a fillable-form field or one custom identifier on a single page, which requires a different approach.
What Bates numbering adds to a PDF
Bates numbering places a sequential identifier on each page in a set of documents, helping with indexing and retrieval. The number can include a prefix or suffix to distinguish one collection from another. It is a visible page mark; Adobe’s instructions do not establish that it is an immutable or tamper-proof identifier.
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The workflow below is for Acrobat Pro. Adobe’s current help says protected or encrypted PDFs and some form types are unsupported, so confirm the files are compatible before preparing a batch.
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- Open the tool: Open a PDF, choose Edit, then select More > Bates numbering > Add.
- Choose the files: Add individual PDFs, a folder, or PDFs that are already open. Arrange the files in the order you want them numbered; the sequence follows that order.
- Set output options: Choose an output folder and file-naming preferences so the numbered copies are easy to identify. These options affect output files, separately from the Bates marks placed on pages.
- Choose placement: Place the insertion point in a suitable header or footer area.
- Insert and configure the number: Select Insert Bates Number, then set the digit count, starting number, prefix, and suffix.
- Apply and check: Complete the dialog to process the files. For an important collection, inspect a sample output and confirm the order and sequence before relying on the full batch.
Adobe’s Bates-numbering help page, updated Nov. 5, 2025, documents this workflow and the compatibility limitations.
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Choose the sequence format
Acrobat allows a digit count from 3 to 15; six digits is the default. Adobe advises choosing more digits for large documents and avoiding the # character in prefix or suffix text.
- Starting number: Set the first value for the sequence. This is useful when continuing an existing series.
- Digit count: Choose enough places for the highest number expected. The selected width controls how the sequence is displayed.
- Prefix and suffix: Add identifying text to distinguish a matter, project, or collection. Keep the identifier useful for later searching.
Distinguish page numbers from output filenames
Bates marks and filename changes serve different purposes. Bates numbering puts identifiers on pages; output naming helps identify the resulting files in a folder. Acrobat’s Output Options can add the token %BATES_NUMBER_KEY% before or after the original filename. Use it when you want Bates-related information in filenames as well as on the pages.
Find a Bates-numbered PDF later
Acrobat can search a PDF collection using a complete Bates number to locate a specific document, or a distinctive portion of the number, such as a prefix or suffix, to find matching files across a location. Adobe’s search instructions were updated Sept. 23, 2025.
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To remove Bates numbering, go to More > Bates numbering > Remove, confirm the removal, and save the PDF. Adobe documents this removal route in its help page updated Sept. 23, 2025.
Quick Recap
When this workflow is not the right fit
- You need a data value in a form: Bates numbering creates page-level identifiers, not a fillable field that stores a user-entered serial number.
- You need one custom mark on a single page: Use a PDF editing method suited to placing that identifier rather than configuring a sequential batch.
- Your PDFs are protected, encrypted, or unsupported forms: Adobe lists these as compatibility limits for Bates numbering. Check file access and compatibility before attempting a batch.
- You want to automate repeated batches: Acrobat Pro’s Action Wizard can apply saved actions to files, but Adobe’s general Action Wizard documentation does not establish that every Bates-numbering setup can be automated. Confirm the specific action configuration first.
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