Keep Lines Containing
Keep only the lines that contain a word or phrase, dropping the rest. Free, no signup.
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Point your phone camera at the code to open this tool.
Keep only the lines that contain a word or phrase, dropping the rest. Free, no signup.
How to use Keep Lines Containing
- Paste or type your contentThe result appears as you type — there is no submit button.
- Set “Contains”Text to match
- Read and copy the resultThe output updates live and the copy button takes it in one click.
Worked example
- apple banana cherry apricot
- apple banana apricot
Nothing you enter leaves your device
All of the work happens inside your browser. Whatever you type is never packaged up and sent to a server, and no request this page makes carries it.
That makes it safe for contract amounts, personal details and internal documents you would rather not hand to a third party — close the tab and it is gone.
What this tool does not do
Keep Lines Containing only does what a browser can do on its own — it talks to no backend service. So it keeps no history for you and syncs nothing across devices; if you need a record, copy or download the result.
It is also not a substitute for professional judgement. For legal, medical or tax decisions, treat the output as a starting point rather than a final answer.
Frequently Asked Questions
- Is the match case sensitive?
- Yes. "Cat" and "cat" are treated as different, matching the source text exactly.
- Can I search for a phrase?
- Yes. Any substring works, not just a single word.