Free Line Number Tool

The Add Line Numbers tool is a free online utility that adds sequential line numbers to your text with customizable formatting options.

Yes, it is completely free with no registration required. All processing happens client-side in your browser.

Yes, the Add Line Numbers tool lets you customize the separator, starting number, and padding to match your needs.

Absolutely. The Line Number Tool processes everything client-side in your browser. No data is uploaded to or stored on any server. Your content remains private on your device at all times.

Yes, the Line Number Tool is fully responsive and works on smartphones and tablets. You can use it on any device with a modern web browser -- no app download required.

No account or registration is needed. Simply open the Line Number Tool in your browser and start using it immediately. There are no sign-up walls or usage restrictions.

Yes, the Line Number Tool handles text of any length with fast, real-time processing. Since everything runs in your browser, performance depends on your device but works well for most use cases.

Simply enter your input in the provided field, adjust any settings to your preference, and the tool will process it instantly. You can then copy the result to your clipboard or download it.

The Line Number Tool works in all modern browsers including Chrome, Firefox, Safari, Edge, and Opera. For the best experience, use the latest version of your preferred browser.

The trick is padding, which keeps the right edge of each number in a clean column so 9 and 100 don't stagger your text. This tool offers three padding styles. Space padding adds blank spaces in front of shorter numbers (" 1", " 2", "10"), so the digits align without changing how they read. Zero padding adds leading zeros instead ("01", "02", "10"), the convention used by filenames and version schemes. None prints each number as-is. By default the tool pads automatically to the width of your largest line number, so a 100-line list aligns to three digits on its own. You can also set a minimum digit width — choose 3 and even line 1 prints as "001." Paste your text, pick Space or Zero padding, and the numbered column lines up instantly.

Yes. The Start Number field lets you begin at any value — 0, 1, 100, or anything else — which is useful when you are continuing a list that already ran elsewhere and need line 48 to follow line 47 from another document. The Increment field controls the step between numbers: leave it at 1 for ordinary counting, or set it to 5 so the lines read 5, 10, 15, 20. A larger increment is handy when you want to leave gaps to insert items later, or to mimic numbering schemes like every-fifth-line references in long files. Both settings update the output the moment you change them, and they combine freely, so you could start at 100 and count by 10. Set your start and increment above and the numbered text refreshes live.

By default the tool numbers every line in your input, including empty ones, so a blank line between paragraphs still receives its own number and the count matches the literal line positions in the file. That is what you want when the number must point to an exact line, such as in a code snippet or log where line 12 truly is line 12. Turning on Skip Empty Lines changes this: blank lines are left untouched and only lines with actual content get a number, so your paragraph breaks stay visible while the numbering reads as a clean sequence of real items. This is better for procedures, quizzes, and lists where empty spacers shouldn't waste a number. A live counter shows total lines versus non-empty lines so you can pick the right mode. Toggle Skip Empty above to compare both.

It depends on what readers expect. For code reviews and configuration files, plain numbers or a colon style ("12:") sit closest to how editors and error logs label lines, so teammates can map "the bug is on line 12" to the same row. For ordinary lists, instructions, and quizzes, a dot ("1.") or parentheses ("(1)") reads as a familiar ordered list, while brackets ("[1]") suit references and footnote-style items. A pipe ("1 |") or dash ("1 -") creates a visible divider between the number and the text, which helps in tables and dense logs. This tool offers all of these as one-click presets, plus a Custom option where you set your own prefix and suffix — for example "Line " to produce "Line 1." Pick the preset that matches your context above and the output reformats instantly.

Choose the Custom format option and you can set your own prefix and suffix around each number, instead of being limited to the built-in styles. The prefix is the text placed before the number and the suffix is the text placed after it, so a prefix of "Line " with no suffix produces "Line 1", "Line 2", "Line 3", while a prefix of "Step " and a suffix of ":" gives "Step 1:", "Step 2:" and so on. You can wrap each number in any characters you like — quotes, arrows, or words — which is handy for tutorials, ticket references, or labeled outputs that need a specific wording. Custom prefixes and suffixes work alongside the padding and increment settings too, so your label can sit in front of a zero-padded, evenly spaced number. Select Custom above, type your prefix and suffix, and watch the labels apply live.