Filter Text Lines
Extract specific data from logs and lists. Filter by keyword, regex, length, or pattern.
[INFO] 2023-10-27 10:00:01 System started [INFO] 2023-10-27 10:00:02 Database connection initialized [ERROR] 2023-10-27 10:00:05 Connection timeout to DB_SHARD_01 [WARN] 2023-10-27 10:00:06 Retry attempt 1/3 [INFO] 2023-10-27 10:00:08 User 'admin' logged in [ERROR] 2023-10-27 10:05:00 Payment gateway 500 Error [INFO] 2023-10-27 10:05:01 Transaction #12345 successful [DEBUG] Cache cleared short line This is a very long line that might filter out if you set a max length restriction on the filter settings.
What is Filter Text Lines?
The Filter Text Lines tool is a professional-grade utility for extracting precise information from chaos. Whether you are a developer parsing server logs, a data analyst cleaning CSV data, or a writer organizing lists, this tool gives you granular control. Filter by simple keywords, use advanced Regex patterns, or even filter by line length—all while preserving original context with line numbering.
Why Use This Tool?
Parse Logs Instantly
Paste a massive error log and instantly filter for "ERROR" or "WARN". Use Regex to find specific error codes like "500" or "404".
Clean Data Lists
Use the Length Filter to automatically remove garbage data that is too short or too long for your requirements.
Preserve Context
Unlike other tools, we let you preserve line numbers so you know exactly where in the original file the extracted line came from.
Features
Smart Filters
Contains, Starts With, Ends With, and Regex support.
Length Filtering
Exclude lines based on minimum or maximum character count.
Advanced Sorting
Sort results alphabetically or by length to organize your data.
Verification View
Toggle to "Excluded Lines" to verify you haven't filtered out important data.
Line Numbering
Optionally prefix output with original line numbers.
100% Private
Runs entirely in your browser. No server uploads.
How to Use
- Paste or Upload: Enter your text or upload a file into the Input box.
- Define Filter: Type a keyword or Regex pattern. Select "Contains" or another mode provided.
- Refine (Optional): Set Min/Max length limits or enable "Trim Lines" to clean up input.
- Output Options: Choose to Sort the results or enable "Prefix Line Numbers" for context.
- Verify & Export: Toggle "Show Excluded" to check your work, then Copy or Download the final result.
Frequently Asked Questions
How does the 'Regex Mode' work?
Regex (Regular Expression) mode allows you to use pattern matching instead of simple text search. For example, entering '\d{4}' will match any line containing a 4-digit number. This is powerful for parsing logs for timestamps or error codes.
Can I filter lines by length?
Yes! You can specify a 'Min Chars' and 'Max Chars' value. The tool will automatically exclude any lines that are too short or too long, which is perfect for cleaning up data lists.
What does 'Preserve Line Numbers' do?
When enabled, this feature adds the original line number (e.g., '[15]') to the beginning of each matched line. This allows you to trace extracted data back to its original position in the source file.
Can I see what was removed?
Absolutely. Use the 'Show Excluded' toggle above the output box to view all lines that did NOT match your filter criteria. This is great for verifying that you aren't accidentally removing important data.
Is my data private?
Yes, completely. All filtering happens locally in your browser using JavaScript. No text is ever sent to our servers.
How do I filter out lines containing a specific word?
Select the 'Does NOT contain text' mode from the controls. Any line containing your specified keyword will be moved to the Excluded list.
Can I sort the results?
Yes, you can sort the filtered results Alphabetically (A-Z/Z-A) or by Line Length (Shortest/Longest). You can also keep the 'Original' order found in the input.
Does it support large files?
Because it runs in your browser, it can handle relatively large files (up to several megabytes) instantly without network latency.
What file formats can I upload?
You can upload any plain text file, including .txt, .log, .csv, .md, and .json files for filtering.
Is case sensitivity supported?
Yes, by default searches are case-insensitive. You can check the 'Aa Case' box to strictly match uppercase and lowercase letters.