Range List Tool
Expand compact number ranges (10-12, 8, 20) into a full sorted list, or collapse a list of numbers back into compact ranges. Automatically sorts and deduplicates in both directions.
Input
Comma, space or newline separated. In "Expand" mode, tokens may be a range like "10-12".
Output
Guides
The Range List Tool converts between two ways of writing a set of numbers: a compact range notation like 1-5, 8, 10-12 and the full, individual list 1, 2, 3, 4, 5, 8, 10, 11, 12. It works in both directions, so you can expand a shorthand range into every value, or collapse a long list of numbers back into a short, readable range string.
How to use it
- Choose a mode: Expand ranges → full list or Collapse list → ranges.
- Paste your numbers or ranges, separated by commas, spaces or newlines.
- Read the result, plus a count of how many numbers or ranges came out. Copy it or download it as a text file.
In Expand mode, each token can be a single integer (8) or an inclusive range (10-12). In Collapse mode, every token must be a plain integer — the tool sorts them and groups consecutive runs into ranges automatically.
Does it handle duplicates and out-of-order input?
Yes, in both directions. Overlapping ranges, repeated numbers and unsorted input are all deduplicated and sorted before the result is built, so 5, 1-3, 3, 2 expands to 1, 2, 3, 5 rather than a messy re-print of the input.
Is there a size limit?
Expansion is capped at 100,000 numbers, so an accidental huge range like 1-999999999 fails fast with a clear message instead of freezing the page.
Does it support negative numbers?
Yes — both modes accept negative integers, e.g. -3-2 expands to -3, -2, -1, 0, 1, 2.
Privacy
This tool runs entirely in your browser. Nothing you enter is uploaded, logged or stored.