Result
All calculations run locally in your browser: parsing, chart, export. Disconnect the network and the page keeps working.
Facts and limits of this method
| Domain | Everything after the first @ on a line, kept exactly as typed |
|---|---|
| Domain comparison | Case-insensitive: "Example.com" and "example.com" are treated as one domain |
| Sort mode | Emails are reordered alphabetically by domain; original order is kept within the same domain |
| Group mode | Emails are grouped under a "— domain —" header, headers sorted alphabetically, original order kept inside each group |
| Lines without @ | Collected separately and placed under a "(no domain)" header at the end |
| Distinct domains | Count of unique domains found, not counting the "(no domain)" bucket |
When it misleads you
- The tool does not validate email addresses — it only looks for an @ character and takes whatever follows it as the domain, so a malformed address like "a@@b.com" or "a@" is still processed rather than rejected.
- Domain comparison is a simple lowercase match. It does not resolve subdomains, so "[email protected]" and "[email protected]" are treated as two different domains, not one.
- Blank lines in the input are skipped silently and never appear in the output or in either count.
- Sorting is alphabetical (by character code), not by TLD popularity or provider size — "acme.com" sorts before "brand.io" simply because "a" comes before "b".
How it is calculated
Each non-empty line is scanned for the first @ character. Everything after it becomes that line's domain; a line with no @ has no domain and goes into the "(no domain)" bucket.
In sort mode, the lines with a domain are reordered by comparing domains alphabetically (case-insensitive); lines that share a domain keep their original relative order, and the no-domain lines are appended at the end under their own header.
In group mode, lines are collected into one bucket per domain first, the domain names are sorted alphabetically, and then each bucket is printed as a "— domain —" header followed by its lines in their original order.
"Distinct domains found" counts how many different lowercase domains were seen across all lines with an @; it ignores how many emails share each domain.
Questions and answers
What happens to lines without an @ symbol?
They are treated as having no domain and are placed together under a "(no domain)" header, so you can spot and fix them instead of losing them silently.
Is domain comparison case-sensitive?
No. "Example.com" and "EXAMPLE.com" are treated as the same domain in both sort and group modes.
Does grouping change the order of emails inside one domain?
No. Inside each domain group the emails keep the exact order they had in your original list.
Are subdomains treated as the same domain?
No. "mail.example.com" and "example.com" are compared as two different, unrelated domains.
Is my list of addresses sent anywhere?
No. Everything runs in your browser; the list you paste is never uploaded.