Clean a list by removing repeated lines while keeping the first occurrence and original order. Optionally ignore case, trim each line or remove blank lines, privately in your browser.
Your list is processed on your device with no uploads, account, libraries or browser storage. The first occurrence of every matching line is kept, without sorting your list. You can compare the cleaned result with the untouched original.
The first occurrence is kept, and the original relative order stays unchanged. By default, matching is exact, including letter case and whitespace. Ignore case changes matching only, so the first spelling is retained.
Yes. With Trim enabled, leading and trailing whitespace is removed from every line before comparison and output. Spaces inside the line remain unchanged. Without trimming, differently spaced lines remain distinct.
By default, repeated identical blank lines are deduplicated like other lines. Whitespace-only lines are distinct unless trimming is enabled. Remove blank lines drops empty and whitespace-only lines before duplicate matching, and counts them separately from duplicate removals.
An ending newline terminates the final line and is not counted as an additional blank entry. If the input ends with a newline and at least one line is kept, the result retains an ending newline. CRLF and CR endings are normalized to LF. These list-entry counts can differ from counters that include a trailing empty line.
It compares complete text lines rather than validating their meaning. Unicode lowercase mappings are used when ignoring case. It does not normalize accents, rewrite URLs, validate addresses or apply locale-specific matching.
Each list can contain up to 200,000 UTF-16 text units and 20,000 lines. Some emoji use multiple units. Oversized input is preserved, but processing is unavailable until it is shortened. Empty results have no download; clear removes both input and result.
