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Filter Text Lines
Keep or remove lines using literal, blank-line or codepoint-length rules.
Pasted text, One UTF-8 text file
filtered.txt, line-filter-report.json
Browser only
Runs locally in your browser. Your files, pasted content and generated output are not uploaded. Reset clears this tool’s working data.
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How to use this tool
- Paste the admitted text or choose one UTF-8 source file. A selected file takes precedence.
- Choose the explicit operation and options, then inspect the stated conventions and limits.
- Select Filter lines and download filtered.txt, line-filter-report.json.
Examples
Keeping lines containing error retains error: missing file and removes ready.
Limitations
- At most 200,000 UTF-16 units / 800,000 UTF-8 bytes; 50,000 logical lines and 65,536 units per line; at most 5 MiB complete combined output and 30 seconds. A selected valid UTF-8 file takes precedence over paste. File BOM and original CR/LF spans are preserved for reporting; native textarea input can normalize newlines.
- Literal comparisons are case-sensitive. Blank-line and empty-literal behavior are explicit; regex execution and numeric predicates are outside this version.
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