Remove Duplicate Lines
Remove duplicate lines from a list and optionally sort it.
Runs entirely in your browser. Your data is never uploaded.
About Remove Duplicate Lines
Remove Duplicate Lines deletes repeated lines from a list, with options to ignore case, trim whitespace and sort the output alphabetically.
Remove Duplicate Lines is one of dozens of free text tools on Crystal Toolkit. When you open this page, the tool loads in your browser and is ready to use immediately — there is nothing to install and no account to create. Everything you enter is handled locally using fast, modern web technology, so the work happens on your device rather than on a remote server. This approach keeps your information private, removes upload and download waiting time, and lets the tool keep working even on a slow connection once the page has loaded.
How to use Remove Duplicate Lines
- 1Paste your list, one item per line.
- 2Choose options like sort or ignore case.
- 3Copy the de-duplicated list.
Key features
- Processes text instantly as you type — no waiting, no page reloads
- Works with any amount of text, from a tweet to a full manuscript
- Keeps your writing completely private — nothing is ever uploaded
- 100% free with no sign-up, account or watermark
- Mobile-first design that works on any device
Common use cases
- Writers and students checking length and formatting before submitting
- Marketers fitting copy into character-limited fields and meta descriptions
- Developers cleaning and normalising text data and lists
Why use Crystal Toolkit?
Unlike many online text tools, Crystal Toolkit runs Remove Duplicate Lines entirely inside your browser. That means your data is processed on your own device and is never uploaded to a server, so it stays private and the results appear instantly. There is no sign-up, no daily limit and no watermark — just a fast, focused remove duplicate lines you can use as often as you like, on desktop or mobile. Crystal Toolkit is built and maintained by CrystalSoftonic and is funded by unobtrusive ads, which is how we keep every tool completely free.
Frequently asked questions
Does it preserve order?
Yes, unless you enable sorting — then lines are ordered alphabetically.
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