Why Law Firms Are Switching From Word to Tenthlining Tools

Unlike Adobe Acrobat, Microsoft Word actually does have a built-in line-numbering feature, and on paper it looks like exactly what tenthlining requires: turn it on, set the count to every 10 lines, and you're done. In practice, firms that have relied on this feature for a while tend to move away from it, not because it's broken, but because of a handful of real, recurring problems that only show up once you've used it on enough documents.

What Word's line numbering actually does

Under the Layout ribbon, Word's Line Numbers option lets you number every line of a document, set an increment (every 10th line, for example), and choose whether numbering restarts on each page, each section, or runs continuously through the whole document. It genuinely works, as a Word feature. The problems start once you look at what it's actually numbering and how that survives into a filed court document.

It counts everything, unless you manually suppress it

Word's line numbering counts every line in the document by default, including headings, the case number block, centered title text, and signature lines. A legal pleading isn't a uniform block of body text. It has a heading, a case citation, paragraph breaks, and often a centered title before the substantive numbered paragraphs even begin. Getting Word to number only the lines that should actually count means manually applying "Suppress for Current Paragraph" to every heading, title, and non-body element in the document. Miss one, and your every-tenth-line count is off from that point forward, in a way that isn't obvious just from looking at the rendered page.

Settings have to be reconfigured per document, correctly, every time

Restart-per-page, restart-per-section, and continuous numbering all produce different results, and choosing the wrong one for a given filing is an easy, invisible mistake. Add to that the correct increment, the correct starting margin distance, and the suppression settings above, and you have four or five settings that all have to be right at once, on every single document, for every clerk drafting one. In a firm with more than one person preparing filings, that's a consistency problem waiting to happen. As covered in Common Tenthlining Mistakes That Get Pleadings Rejected, small, invisible formatting errors like this are exactly the kind that don't get caught until a registry or a judge flags them.

It only works on the Word source, not on the document you actually have

Word's line numbering only applies to a Word document you have open and control. It does nothing for a PDF received from opposing counsel, a scanned older file being digitized, or a document someone else drafted and sent you as a finished PDF. A meaningful share of real filing work involves documents that don't exist as an editable Word file at the point you need to number them, and Word's feature is simply unavailable in that situation. A tool that numbers an existing PDF directly, regardless of where it came from, covers a case Word's approach structurally can't.

Numbering happens before conversion, not after

Because Word's line numbering is applied before the document becomes a PDF, any last-minute edit after that point, a rewritten paragraph, an added clause, a partner's final comment, requires reopening the Word file, making the change, and reconverting, hoping the line numbering settings held up correctly through the edit and the export. A tool that numbers the finished PDF as a final step sidesteps this entirely: the numbering is the very last thing applied, after every other edit is already locked in.

No court presets, no batch, no team consistency

Word's line numbering has no concept of "this is a Supreme Court filing" versus "this is a High Court Record of Appeal." Every document needs its settings configured from scratch, by whoever happens to be preparing it, with no shared preset to fall back on. At firm scale, that means the correctness of your formatting depends on every individual clerk remembering and applying the right settings every time, rather than a shared, saved configuration doing it consistently.

Where this leaves Word

None of this makes Word a bad tool. It remains the right place to draft the actual content of a pleading. The shift firms are making isn't away from Word entirely, it's toward treating Word as the drafting tool and a dedicated tenthlining tool as the final formatting step, applied once to the finished PDF rather than configured and hoped-for inside the draft itself. That division of labor removes the suppression, restart-setting, and per-clerk consistency problems in one move, without asking anyone to change how they actually draft.

For the mechanics of getting a Word draft into a properly formatted PDF before that final numbering step, see How to Convert a Word Pleading Into a Court-Compliant PDF. For the numbering step itself, see How to Number Every Tenth Line in a PDF Without Retyping.