Text & Writing
Keep Lines Containing
Filter text to only the lines that contain a phrase.
Worked example
Set Phrase to error and leave Case-sensitive off. Matching is substring-based, not whole-word-based; use the regex filter for a precise pattern.
Input
ERROR timeout INFO ready error retry
Expected result
ERROR timeout error retry
Good to know
Frequently asked questions
How do I use it?
Enter your text, adjust the options and press “Keep matching lines”. Check the result, then copy or download it.
How does it work?
A line is kept if the phrase appears anywhere in it.
Is my data uploaded?
No. Everything is processed in your browser and nothing is sent to a server. No account is needed.
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