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Filter by Keyword

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About Filter by Keyword

The Filter by Keyword tool lets you keep or remove lines that contain a specific word or phrase. Paste your text, enter a keyword, and instantly filter the results. It is a quick way to search, extract, or remove matching lines from large blocks of text.

Use the tool to filter log files, CSV exports, email lists, reports, and other text data. Whether you need to find specific records or remove unwanted entries, the tool helps you work with large datasets more efficiently.

You can choose to keep only matching lines (include mode) or remove them completely (exclude mode). This makes it useful for data cleaning, text analysis, and content review tasks.

The tool supports both case-sensitive and case-insensitive matching. Results update instantly as you type, making it easy to refine your search and verify the output.

Everything runs locally in your browser. Your data never leaves your device, and no account, login, or installation is required.

Practical Uses for Filter by Keyword

  • Pull all ERROR lines out of a server log file
  • Keep only rows from a CSV export that match a specific status
  • Remove test or staging entries from a list of live server names
  • Extract every line mentioning a specific customer ID from a log
  • Keep only email addresses from one domain out of a mixed list
  • Remove header or footer boilerplate lines from a text export

How to Use Filter by Keyword

  1. Paste your list or text — one item per line.

  2. Type a keyword or phrase to filter by.

  3. Toggle Include/Exclude to keep matching lines or remove them.

  4. Copy the filtered result.

Examples

Example — Keep lines with 'error'
Input
INFO: Server started
ERROR: Connection failed
INFO: Request received
ERROR: Timeout
Output
ERROR: Connection failed
ERROR: Timeout
Example — Remove lines with 'test'
Input
production-server
test-server-1
staging-server
test-server-2
Output
production-server
staging-server
Example — Extract customer ID mentions
Input
Order #1001 - cust_882
Order #1002 - cust_401
Order #1003 - cust_882
Output
Order #1001 - cust_882
Order #1003 - cust_882
Example — Remove staging servers
Input
prod-web-1
staging-web-1
prod-web-2
staging-web-2
Output
prod-web-1
prod-web-2
Example — Filter CSV rows by status
Input
Order 1,Shipped
Order 2,Pending
Order 3,Shipped
Output
Order 1,Shipped
Order 3,Shipped

Who Uses the Filter by Keyword Tool

  • Developers and DevOps extract ERROR or WARN lines from raw server logs during an incident.
  • Data analysts keep or remove rows matching a specific value before importing a CSV export.
  • Support teams pull all lines mentioning a specific customer ID or ticket number from a log.
  • Marketers filter a contact list down to addresses from one domain or campaign source.
  • QA engineers extract failing test lines from a large automated test run log.

Comparisons

Filter by Keyword vs Find & Replace

Filter by Keyword and Find & Replace both work on matching text, but they do different jobs. Filter by Keyword operates on whole lines — it decides whether to keep or throw away each line based on whether it contains your keyword, which is ideal for narrowing down logs, CSV rows, or lists.

Find & Replace works within lines — it doesn't remove any lines, it changes the text inside them. If you need to shrink a list down to just the relevant rows, use Filter. If you need to change the content of every row, use Find & Replace.

Frequently Asked Questions

Is filtering case-sensitive?

Case-insensitive by default. Enable the Case Sensitive toggle to only match exact case.

Can I filter by multiple keywords?

The basic mode filters by one keyword. For multi-keyword filtering, run the tool multiple times, using each pass's output as the next input.

What is the difference between Include and Exclude mode?

Include mode keeps only lines that contain your keyword. Exclude mode removes all lines that contain your keyword and keeps the rest.

Can I filter using a regular expression?

For regex-based filtering, use the Regex Tester tool or the Find & Replace tool with regex mode enabled.

Can I use this to filter log files?

Yes — paste your log entries and filter by ERROR, WARN, a specific IP address, or any other keyword to extract only the relevant lines.

Does it search inside words or only match whole words?

It matches anywhere in the line, including inside words. 'app' matches 'apple', 'application', and 'app'.

Can I extract every line that mentions a specific customer ID?

Yes — paste your log or export, enter the customer ID as the keyword, and Include mode will keep only the lines mentioning that ID.

Can I remove staging or test entries from a server list?

Yes — enter 'test' or 'staging' as the keyword and switch to Exclude mode to remove every line containing that word, leaving only production entries.

Can I filter a CSV export down to one status value?

If each row is on its own line, yes — enter the status value (e.g. 'Shipped') as the keyword and use Include mode to keep only matching rows.