Last updated: May 18, 2025
List of numbers from 1 to 20
The online numbered list generator instantly creates sequences from 1 to 20.
This tool is perfect for quickly adding numbering in Excel, generating product SKUs, or preparing test-question templates. Supports vertical and horizontal layouts, custom delimiters, leading zeros, and surrounding characters.
How to create a list of numbers 1–20
The range 1–20
is set automatically. Follow four steps:
- Format: choose “Column” or “Row.”
- Delimiter: comma, period, dash, space, “/”, “|” or your own character.
- Preview: the result appears instantly.
- Copy: click “Generate” then “Copy” to copy the list to the clipboard.
Additional options
Step (interval): enter an integer to form, for example, 3 → 3, 6, 9…
or 10 → 10, 20, 30…
.
Leading zeros: add zeros before single-digit numbers for equal length: 001
, 002
… Useful for SKUs or IDs.
Surrounding characters: specify characters before and after the number for brackets, quotes, or other styles.
Delimiters
You can create a list without a delimiter (for columns) or choose a standard one. For a custom symbol, select “Custom.”
Type | Symbol | Example |
---|---|---|
Comma | , | 1,2,3,4,5 |
Comma + space | , | 1, 2, 3, 4, 5 |
Space | 1 2 3 4 5 | |
Dash | – | 1-2-3-4-5 |
Period | . | 1.2.3.4.5 |
Period + space | . | 1. 2. 3. 4. 5 |
Vertical bar | | | 1|2|3|4|5 |
Slash | / | 1/2/3/4/5 |
Surrounding characters
By default there is no surrounding. To add brackets or other symbols, choose “Custom.”
Type | Before | After | Example |
---|---|---|---|
Parentheses | ( | ) | (1) |
Square brackets | [ | ] | [1] |
Curly braces | { | } | {1} |
Angle brackets | < | > | <1> |
Need a different symbol? Select “Custom” and enter your own delimiters or surrounding characters.
Usage examples
Excel/Google Sheets: copy the list and paste into a spreadsheet.
Product catalogs: generate SKUs (SKU-001
) and add to your CMS.
Documentation: clear numbering of sections and subsections for reports, contracts, and minutes.
Educational materials: question lists or recommended readings for tests.
Events & giveaways: quick numbering of participants or tickets for instant printing.
Frequently Asked Questions
Can I export the list to .csv or .txt?
Yes — click “Save to file” and choose your format.
How do I add a prefix before numbers?
In the “Surrounding characters” field, enter the prefix, e.g. ID-
.
How do I create two-level numbering (1.1, 1.2…)?
Generate a list 1–20, set the delimiter to .
, and add the first level (1
) in the prefix.