List Converter Online (Sort, Dedupe, Format)
Runs 100% in your browser — your files never leave your device.
Turning a raw dump of lines into a JSON array, an HTML list, or a comma-separated field comes up constantly. Paste your list, toggle the transforms you need — dedupe, trim, sort, reverse, lowercase — set prefixes, suffixes, and separators, and copy the result. Great for building arrays, SQL IN clauses, and markup lists.
How it works
- 1
Paste your list
One item per line.
- 2
Pick transforms
Sort, dedupe, trim, reverse, lowercase — all optional and live.
- 3
Shape the output
Set separator and item/list wrappers, then copy the result.
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