Keep Lines Containing Text
Keep Lines Containing Text transforms your text instantly. Runs locally in your browser — no uploads, no server processing.
Input
Output
Tip: You can verify in DevTools → Network that nothing is uploaded.
About this Keep Lines Containing Text
Keep Lines Containing Text transforms your text instantly according to specific rules. This tool processes your input locally in your browser.
Use this tool to clean, format, or prepare text for your workflow. All processing happens locally — nothing you paste is sent to a server.
- Process text data quickly without external tools
- Transform content for development workflows
- Clean and format text for analysis
- Enable Auto to transform as you type
- Upload text files directly from your device
- Download the result when done
FAQ
No. Everything runs locally in your browser. Nothing you paste is sent to a server.
After the page loads once, it will typically keep working offline (unless you hard refresh with no cache).
No. Your input stays in your browser. Only optional preferences like theme or language may be stored.
Any plain text. You can paste text directly into the input box.
It keeps lines that contain the match text and removes all other lines, producing a filtered output.
Basic versions use case-sensitive matching. For case-insensitive matching, add a toggle or normalize casing before filtering.
If no match text is provided, the output is usually empty because there is nothing to match against.