Line Filter Tool
Filter large text blocks, server logs, or lists by keeping or removing lines matching a search phrase, with optional case sensitivity.
Result
Your result will appear here.
How to use Line Filter Tool
- 1Paste your text or server log into the input box.
- 2Enter the search term you want to filter by.
- 3Choose whether to "Keep matching lines" or "Remove matching lines", toggle case sensitivity if needed, and copy the filtered output.
Key features
Include Filtering
Keeps only lines containing matching substrings with zero delay.
Exclude Filtering
Removes lines containing matching substrings to clean logs and data files.
Case Sensitivity Toggle
Switch between case-insensitive search and strict case-sensitive matching.
Fast Log Processing
Ideal for inspecting server logs, trimming CSV rows, and filtering debug output.
Examples & use cases
Extracting Error Logs
Isolates relevant error messages from verbose log files.
INFO: Starting server ERROR: DB connection failed INFO: Worker started ERROR: Timeout
ERROR: DB connection failed ERROR: Timeout
Excluding Comment Lines
Strips unwanted header or comment rows.
# Header val1,val2 # Comment val3,val4
val1,val2 val3,val4
Frequently asked questions
Helpful guides & tutorials
Related tools
Sort lines alphabetically or numerically, A-Z or Z-A.
Delete repeated lines from a block of text.
Add or remove a prefix and suffix on every line.
Add or remove line numbers from text.
Count words, characters, sentences and paragraphs instantly.