Add Line Numbers to PDF
Upload a PDF and add sequential line numbers to the left or right margin of every page. Set line height, font size, color, and choose continuous or per-page numbering - all processed locally in your browser.
4-24 pt. Default 9 pt (small, unobtrusive).
Distance between numbered lines. Match your document's line spacing.
Left margin is the legal/coding standard.
Continuous is standard for legal documents.
How far from the page edge.
Where first line number starts.
Where last line number stops.
First line number on page 1 (or first page in scope).
Legal briefs typically number every 5th line.
Enter any hex value like #444444.
Settings Summary
Upload a PDF above to get started.
Why Use Our Add Line Numbers to PDF Tool?
Precise Legal & Code Formatting
Add line numbers to PDF pages in the exact left-margin format required for U.S. court filings, legal briefs, and printed source code. Number every line or every 5th line - the standard for legal documents.
Full Layout Control
Set font size, line height, margin offset, top and bottom margins, and starting number independently. Match the line height to your document's text spacing for perfect alignment.
Continuous or Per-Page Numbering
Choose per-page mode to restart line numbers on each page, or continuous mode to number lines sequentially across the entire document - essential for multi-page legal filings.
Private & Secure - No Upload
Your PDF never leaves your device when you add line numbers. All processing runs locally in your browser, keeping confidential legal and business documents completely private.
Common Use Cases for Add Line Numbers to PDF
Legal Briefs & Court Filings
U.S. courts require pleadings and briefs to have numbered lines in the left margin - typically every line or every 5th line on legal-size paper. Add line numbers to PDF documents before submission.
Contracts & Agreements
Number every line of PDF contracts so parties can reference specific terms precisely during negotiation or dispute - eliminating ambiguity about which clause is being discussed.
Source Code Printouts
Print source code with numbered lines for code review sessions, debugging walkthroughs, and technical documentation where reviewers need to annotate specific lines by number.
Academic & Research Papers
Add line numbers to manuscripts and thesis drafts submitted for peer review - reviewers can cite line numbers when providing feedback instead of vague paragraph references.
Poetry & Literary Works
Add line numbers to poems and literary analysis documents so students and scholars can cite specific lines in essays and classroom discussions with precision.
Compliance & Audit Documents
Number lines in compliance reports, audit findings, and regulatory filings to make it easy for reviewers to annotate and reference specific passages during review cycles.
Understanding How to Add Line Numbers to PDF
What Are PDF Line Numbers?
PDF line numbers are sequential numbers printed in the left or right margin of each page, aligned with each line of text, so every line can be identified by its position number. When you add line numbers to a PDF you enable precise cross-referencing - reviewers, attorneys, and editors can say "see line 47" instead of guessing a paragraph location. Line numbers are a standard requirement for U.S. court pleadings, legal briefs, peer-reviewed manuscripts, and printed source code reviews. Our add line numbers to PDF tool lets you configure every aspect of the numbering system and processes your document entirely in your browser.
How Our Add Line Numbers to PDF Tool Works
- Upload your PDF: Drop or select your document. It loads in your browser using the pdf-lib library - no server upload, no waiting for a remote queue.
- Configure line numbering: Set the font size and line height to match your document's text spacing. Choose left or right margin placement, the offset from the page edge, top/bottom margins, starting line number, and color. Optionally set the step interval (number every 5th line for legal briefs).
- Choose mode and scope: Select continuous numbering to count lines across the entire document, or per-page mode to restart on each page. Apply to all pages, specific pages, odd/even pages, or a custom list.
Line Numbering Settings Explained
- Line Height: Must match the vertical spacing of text in your PDF. A 12 pt body font with single spacing uses ~14-15 pt line height; 1.5× spacing uses ~18 pt. Getting this right aligns numbers with actual text lines.
- Number Every N Lines: Set to 5 for the U.S. legal brief standard (numbers appear at lines 5, 10, 15…). Set to 1 to number every single line.
- Continuous Mode: Lines are numbered sequentially across all selected pages, so page 2 picks up where page 1 left off. Essential for depositions and multi-page pleadings.
- Font: Numbers are rendered in Courier, a standard monospaced font that aligns cleanly in the margin without interfering with variable-width body text.
Privacy, Security & Availability
Our add line numbers to PDF tool runs entirely in your browser session using the open-source pdf-lib library. Your document is never uploaded to any server or cloud service - legal filings, contracts, and research manuscripts stay completely private. The tool is free with no signup, no account, and no usage limits on desktop and mobile browsers.
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Frequently Asked Questions About Add Line Numbers to PDF
The tool overlays sequential numbers along the left or right margin of each page, one number per line position, so readers can quickly reference specific lines by number - essential for legal documents, court filings, and source code printouts.
Yes. Use the "Continuous" numbering mode and line numbers will increment from page to page without resetting. Use "Restart Each Page" if you need each page to start from the same number.
Set the Line Height field to match your document's line spacing in points. A typical body text paragraph at 11 pt with 1.5× spacing uses about 16-17 pt line height. For single-spaced 12 pt text, 14-15 pt works well.
Yes. Set "Number Every N Lines" to "Every 5th line" and the tool will only print numbers on positions 5, 10, 15, etc., leaving the rest blank - exactly the standard for U.S. legal briefs and court documents.
No. All line number processing runs entirely in your browser using pdf-lib. Your PDF never leaves your device and is never transmitted to any external server.
Yes. Use the Apply To setting to target all pages, first or last page only, odd/even pages, or enter a custom comma-separated list of page numbers.
Line numbers are rendered in Courier (a monospaced font), which aligns cleanly in the margin and is the standard choice for legal and code documents. The font size is configurable from 4 to 24 pt.
Yes, completely free with no account, signup, or usage limits required.