Text Line Extractor
Input
Upload a text file, input a keyword, and extract matching lines to a new file instantly.
Drop files here or
Accepted: TXT, LOG, CSV, JSON, DATA
All processing happens in your browser — your files are never uploaded to a server.
About this Tool
The Text Line Extractor tool on AllThatConverter filters and extracts lines containing specific keywords from your text content or files in real-time. Supporting plain text search, regular expressions (Regex), case sensitivity, and invert (exclude) matching, all processing is performed 100% locally in your browser with zero data leakage.
100% Secure Local Processing Active
This tool runs entirely on your device via WebAssembly and browser Canvas. No files are ever sent to any remote server, ensuring complete data security.
How to Use
Paste your source text or click the upload button to load a text file from your device.
Enter your search keyword and toggle optional parameters like Regex, Case Sensitive, or Exclude Matches.
Click the 'Extract Lines' button to display filtered rows instantly, and click 'Save Extracted Text' to download the result as a text file.
Core Scenarios & Use Cases
Server Log Analysis & Debugging
Quickly isolates rows containing 'ERROR' or 'WARN' tokens from massive application log files to accelerate diagnosis.
Data Filtering & List Extraction
Filters list structures to grab only matching patterns (such as email formats or domain names) using regular expression syntax.
Inverted Matching & Exclusion
Uses invert matching to sweep away comment indicators or blacklisted tags, retaining only clean content lines.
Frequently Asked Questions
You can load and extract lines from files spanning tens of megabytes instantly. Extremely heavy files (hundreds of MBs) might cause transient browser lags depending on your hardware.
Absolutely. All processing occurs locally within your browser sandbox. We collect no telemetry data, ensuring that sensitive access logs or code scripts remain completely offline.