Email Validator
Upload a .txt or .csv file of email addresses and instantly see which entries are correctly formatted and which are not. Each invalid email is flagged with a plain-English reason (e.g., missing @-sign, invalid domain). A summary counts total, valid, and invalid addresses – perfect for quick list hygiene, all processing happens locally in your browser.
How to Use
- 1Click the upload area and select a .txt or .csv file containing one email address per line.
- 2Click "Validate Emails" – the tool reads the file and checks every entry.
- 3Review the results: the summary shows total, valid, and invalid counts, and the invalid list explains exactly why each address failed.
Why use AppSofts' Email Validator?
Frequently Asked Questions
Will my email list be uploaded anywhere?
No. The file is read entirely in your browser – nothing leaves your device.
What email patterns are considered invalid?
The validator uses industry-standard rules (RFC-like checks) including mandatory @-sign, a valid domain structure, no spaces, and reasonable length limits. If an address doesn't match these rules, you'll see a specific reason.
Can I validate a file with thousands of addresses?
Yes, the tool processes the file line-by-line in memory. Performance is excellent for typical list sizes; however, extremely large files (>50 000 lines) may take a few seconds, but will still complete in-browser.