Lists & combinations

Work with lists: convert, reverse, deduplicate, compare, merge, split and pick items at random. Built for spreadsheet exports and quick data wrangling.

Anki flashcard TSV generatornewTurn a list of notes into a tab-separated file ready to import into Anki.

Cartesian product of listsCross every item of one list with every item of the others — all combinations, one per line.

Combination generatorGenerate every combination of k items from a list, with or without repetition.

Compare listsFind items that two lists share, and items unique to each of them.

CSV group and sumnewGroup CSV rows by one or more columns and sum, count or average the rest.

CSV join by keynewJoin two CSV tables into one using a shared key column.

CSV mergernewStack several CSV tables into one, reconciling different or reordered columns.

CSV row filternewKeep only the CSV rows whose column values match a condition you set.

CSV splitter by columnnewSplit a CSV into separate tables grouped by the value of one column.

Email list validatorCheck a list of email addresses for syntax errors and common typos.

Fuzzy list matchnewPair up items from two lists even when they differ by typos, spacing, or accents.

Line combinationsCombine every line of one list with every line of another.

List splitterSplit a long list of lines into smaller lists by chunk size or count.

List to CSV converterTurn lines into a comma-separated list, or split a separated list back into lines.

Merge listsCombine two lists into one, with optional deduplication and sorting.

Natural sort linesSort lines the way a person would, so "item2" comes before "item10".

Permutation generatorList every ordering of your items — full permutations, k-permutations or letter anagrams.

Product attribute parserTurn freeform product attribute text into a clean key/value table or JSON.

Random matchmakerShuffle a list and split it into random pairs or groups, leftover handled.

Random pickerDraw one or more random entries from a list.

Random team generatorSplit a list of names into fair random teams.

Reverse list orderFlip the order of lines so the last one comes first.

Round-robin schedule generatornewBuild a schedule where every participant plays every other exactly once, split into fair rounds.

Sort lines by lengthOrder the lines of a list from shortest to longest, or the other way around.

Sort lines by word positionSort lines by a specific word within each line, not the whole line.

Tournament bracket generatornewTurn a list of participants into a single-elimination bracket with byes handled automatically.

Lists & combinations

A surprising amount of office work is really list work: two exports that need comparing, a column that needs to become comma-separated, a signup sheet that needs a random winner. The tools here do exactly that — compare two lists and see what appears in both or only in one, convert a list to CSV and back, merge lists, split one into evenly sized groups, reverse the order, pick random items and generate every combination of entries.

The compare-lists tool alone covers a family of daily problems: which customers are in the old export but not the new one, which keywords two campaigns share, which invitees have not replied yet. Paste both lists, and the intersection and differences appear immediately.

Everything runs in your browser, which means client lists, attendee sheets and other personal data stay on your machine — no upload, no account, no trace. The tools handle thousands of entries without breaking a sweat, and the live tally under the output tells you at a glance how many items each operation produced.