Remove Duplicate Lines
Last updated: June 16, 2026Delete repeated lines instantly.
Remove Duplicate Lines is a free online tool to delete repeated lines instantly. It runs entirely in your browser, so your files never leave your device — nothing is uploaded. There's no sign-up, no watermark, and it works on any modern browser on desktop or mobile.
How to use Remove Duplicate Lines
Remove Duplicate Lines deletes repeated lines from any list or text while keeping the original order, with optional case-insensitive and trim matching. It's ideal for cleaning lists, logs, emails and keyword sets. Free, private and runs in your browser.
Read the full guide: How to Remove Duplicate Lines From Text (Free)
- 1Paste your list or text.
- 2Toggle ignore-case and trim if needed.
- 3Copy the de-duplicated result.
Keeps order
The first occurrence of each line is kept in place.
Smart matching
Optionally ignore case and surrounding whitespace.
Free & private
Your list never leaves your device.
Clean a scraped email or lead list
After scraping contacts or merging signup exports, the same email often appears across several files. Paste the whole list, switch on Ignore case so John@site.com and john@site.com count as one, and keep Trim whitespace on to catch addresses with stray spaces. You get a deduplicated list in original order, with a count of exactly how many repeats were stripped before importing to your CRM or mailing tool.
Dedupe a keyword research list
Pulling keywords from Search Console, Ads, and competitor tools leaves heavy overlap. Drop the combined list here to collapse repeated phrases into a single unique set, with Ignore case treating Running Shoes and running shoes as the same query. The first occurrence stays put, so your priority ordering survives, and the removed count tells you how much overlap your sources actually had before you build content briefs.
Find unique values from log output
When a log or stack trace repeats the same error line hundreds of times, paste it in to keep one copy of each distinct message in the order it first appeared. Leave Trim whitespace on so lines with differing leading indentation still collapse together. The removed counter shows how repetitive the output was, turning a noisy dump into a short, scannable list of the unique events worth investigating.
Remove Duplicate Lines — frequently asked questions
Does it keep the original order?
Yes — it removes later duplicates and keeps the first occurrence of each line in its original position.
Can it ignore case and spaces?
Yes, toggle 'Ignore case' and 'Trim whitespace' to treat near-identical lines as duplicates.
Is it free?
Yes, completely free.
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