Unique Line Counter / Duplicate Line Counter
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What is a Unique Line Counter?
A unique line counter helps you count how many times each line appears in a block of text.
It is useful for logs, keyword lists, exports, tags, emails, deduplication checks, and repeated multi-line data.
How to use the Unique Line Counter
- Paste your text into the input field.
- Choose whether to ignore case, trim whitespace, remove empty lines, or sort by frequency.
- Click Count lines.
- Review the counts and copy the result.
Tips
- Enable trim whitespace if lines may contain leading or trailing spaces.
- Enable ignore case if Apple and apple should be counted as the same line.
- Use sort by count to see the most repeated lines first.
- This tool is useful before deduplication or cleanup.
Related guides
Learn the workflow behind this tool and what to check next.
How to clean CSV data before import
A CSV cleanup workflow for reviewing imported data, deduplicating rows, filtering records, and extracting the columns that matter.
How to debug API JSON responses
Format the response, confirm the HTTP status, validate the schema, and compare payload changes before changing application code.
Unique line counting checks before cleaning text lists
Counting unique lines is useful for logs, exports, keyword lists, and IDs, but normalization choices change the result.
Choose normalization rules
Decide whether to trim whitespace, ignore case, remove empty lines, or preserve exact lines before comparing counts.
Separate IDs from labels
Use exact matching for identifiers, hashes, and codes, but normalized matching for names, tags, and free-text lists.
Review duplicate frequency
High-frequency lines can reveal repeated errors, bot traffic, copied content, or export problems that simple totals hide.
Keep the raw input
Save the original list when cleanup decisions affect audit trails, deduplication reports, or later debugging.
Privacy and usage
Built for quick checks without an account
Toolinix tools are designed for short developer tasks: paste a safe sample, inspect the result, copy what you need, and move on.
No login required
You can use the tools without creating an account, subscribing to a newsletter, or saving a workspace.
Local when possible
Formatters, generators, encoders, and text utilities generally run in your browser. Network diagnostics may need a server-assisted lookup to check public URLs, domains, or IPs.
Keep secrets out
Do not paste production passwords, private keys, access tokens, customer records, or regulated data into online tools unless your own security policy allows it.
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