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Swarm

Paste a long list and run one action across every line at once, then copy the whole thing back out.

Runs in your browser · nothing uploaded

0 lines in · 0 lines out

Editing a list one line at a time is slow and error-prone. Swarm treats the whole list as one job: pick an action and it applies to every line together, so a hundred lines take the same effort as one.

It handles the common list chores in one place: change the case, turn lines into slugs, remove duplicates, sort, trim blank space, add a prefix or suffix, or find and replace across the lot. Everything runs in your browser, so even long lists stay on your device.

How it works

  1. 1

    Paste your list

    Drop in your lines: names, URLs, tags, rows from a spreadsheet, anything one-per-line.

  2. 2

    Pick one action

    Choose case change, slugify, dedupe, sort, trim, add prefix or suffix, or find and replace.

  3. 3

    Copy the result

    The output updates live. Copy it all with one click or download it as a text file.

Questions about Swarm

How big a list can it handle?
Thousands of lines are fine. It runs in your browser, so the limit is your device rather than a server quota.
Does my text get uploaded?
No. The list is processed on your own device and never sent anywhere, which matters for anything private.
Can I chain actions?
Run one action, then run the next on the result. The output becomes your new input, so you can build up a sequence.
What does slugify do?
It turns each line into a clean URL-friendly slug: lower case, spaces to hyphens, punctuation removed. Useful for links and file names.

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