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Sequential Number List Generator

Generate a list of sequential numbers in your browser: define start, end and step, add a prefix or suffix per line, pad with leading zeros, and choose any separator. Output capped at 100,000 entries to keep the browser responsive.

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How it works

We compute n = start + i * step for i = 0..count-1 (count derived from end), apply zero-padding if requested, and wrap each number with the prefix and suffix. Custom separator allows building one-liners with commas or any other delimiter.

How to use it

  1. Set start, end, step

    Define the range and the increment between numbers. Output is capped at 100,000 entries to keep the browser responsive.

  2. Add prefix, suffix, padding

    Wrap each number with optional prefix and suffix (TST-, .png), and pad with leading zeros to a fixed width like 3 or 4 digits.

  3. Pick the separator

    Newline for one-per-line lists, comma for SQL IN clauses, any custom delimiter for the format you actually need downstream.

  4. Copy the generated list

    Take the numbers into a CSV column, a database seed, a redirect file, or any place where sequential IDs save you time.

Use cases

Generate sequential test IDs (TST-0001, TST-0002...).

Build a year-month list (2024-01, 2024-02...).

Create a CSV column of incrementing values.

Pre-fill row numbers for a spreadsheet.

Output a comma-separated range for SQL IN clauses.

Your data never leaves your browser

Every utility runs entirely on your device. Nothing is uploaded, nothing is stored on a server. You can disconnect from the internet and they keep working.

Frequently asked questions

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