Remove or Keep Lines
Filter out or extract lines that contain specific keywords. Instantly clean logs and lists with multi-mode keyword support.
Filter Settings
Line Filtering: Enter keywords above to either Remove matching lines or (by inverting) Keep Only matching lines.
This dual-mode tool is perfect for log analysis, CSV filtering, and large-scale list cleaning. All processing is 100% private.
Why use an Online Remove/Keep Lines Tool?
Filtering large documents or log files manually is a time-consuming and error-prone process. Whether you need to strip out error messages from a server log (Remove Containing) or extract only specific data points from a massive list (Keep Only Containing), our Line Filter tool handles both perfectly. Simply paste your text and specify the keywords or phrases you want to filter. With a single toggle, you can switch between removing matching lines or removing everything *not* containing your keywords. It supports multiple patterns at once and offers precision control over case sensitivity. Everything happens locally in your browser, maintaining the total privacy of your data.
Advanced Line Filtering
Dual Filtering Modes
Toggle between 'Remove Containing' and 'Keep Only Containing' to extract exactly the data you need.
Multi-Pattern Support
Filter by multiple keywords simultaneously—just enter each pattern on a new line.
Instant Live Preview
Watch your list shrink or expand in real-time as you tweak keywords and toggle the inversion switch.
Zero-Data Privacy
Your text is never sent to our servers. All filtering logic runs entirely inside your browser's memory.
Frequently Asked Questions
Can I remove lines that contain multiple different words?
Yes! Simply type each word or phrase on a separate line in the keyword input box. If a line contains any of those words, it will be removed.
Does this support partial word matches?
Yes, by default. For example, if your keyword is 'error', lines containing 'error', 'errors', or 'error-log' will all be removed.
How do I handle case-insensitive text?
By default, the tool is case-insensitive. You can toggle the 'Case Sensitive' checkbox if you only want to remove lines that match your exact capitalization.
Is there a limit to the file size?
The tool can handle thousands of lines easily. Performance is limited only by your browser's memory, making it suitable for most log files and data exports.