Frequently Asked Questions

ListFerret is a set of free, privacy-friendly text and list tools that run in your browser. It includes an Email Extractor, Compare Lists, Remove Duplicates, Sort Lines, List Converter, Word Counter and Case Converter.

Yes. All tools are free to use with no sign-up and no usage limits. The site is supported by advertising.

No. There are no accounts. Open a tool and use it.

No. All processing happens locally in your browser with JavaScript. The text you paste and the files you drop are never sent to our servers. See our Privacy Policy.

The tools work on modern desktop and mobile browsers. Once a page has loaded, the processing itself does not need a network connection.

Because everything runs in your browser, the limit is your device’s memory. Lists of hundreds of thousands of lines work on most computers.

Paste the text (or a page’s View Source) into the input box. Addresses appear instantly in the output box. You can also drop .txt, .csv, .html, .eml or .json files.

Yes, by default and case-insensitively. The counters show how many matches, duplicates and filtered items there were.

Yes. Enable “Decode obfuscated addresses” to catch bracketed at/dot patterns, HTML entities, URL-encoded characters and Cloudflare-protected emails.

Yes. Use the include and exclude filters, or click a domain in the Top domains panel. You can also remove role addresses (info@, support@) and free-mail providers.

Plain text with your choice of separator (new line, comma, semicolon, tab, pipe, custom), CSV with count and domain, and JSON. You can also group addresses into batches.

Check that “Validate top-level domain” is not rejecting an uncommon domain ending, and that the text actually contains the full address. Images and PDFs must be converted to text first.

Paste your list into Remove Duplicates. Each line appears once in the output, in its original order. You can also keep only the repeated lines or only the lines that appear once.

In Sort Lines, choose Natural sort. It reads the numbers inside text as numbers.

Paste the column into the List Converter. The default output separator is a comma and space, and you can wrap each item in quotes for SQL or code.

The Word Counter counts any run of letters or numbers as a word, treating hyphenated words and contractions as one word each.

The Case Converter supports UPPER, lower, Title, Sentence, Capitalize Each Word, alternating, inverse, camelCase, PascalCase, snake_case, CONSTANT_CASE, kebab-case, Train-Case, dot.case and path/case.

Paste the lists into List A and List B. “A only” shows items missing from B, and “B only” shows items missing from A.

The intersection (A ∩ B) is the items found in both lists. The union (A ∪ B) is every unique item from either list.

Yes. These are options above the results and are applied to matching only — your original text is kept in the output.

Yes. Enter a column number and each row is matched on that column while the full row is preserved.

It is the number of items in both lists divided by the number of unique items across both lists (Jaccard similarity).

Yes. Use “Send to” under any result to move it into List A or List B and compare it against another list.