Validate email lists before importing to Mailchimp, SendGrid, or any email platform. Check syntax, fix typos (gmial→gmail), flag disposable addresses. 100% browser-based, no API keys needed.
Drop your CSV file with email addresses. Files stay in your browser, never uploaded.
Choose which column contains the email addresses to validate.
Check syntax, fix typos, flag disposable emails. See results instantly in preview.
Get valid emails only or full list with validation status column.
Invalid emails cause hard bounces, which damage your sender reputation with email providers. High bounce rates can get your domain blacklisted. Validate emails before sending to keep bounce rates under 2%.
Example: E-commerce site imports 10,000 customer emails → 8% invalid → 800 bounces → Mailchimp flags account. Solution: Validate first → Remove 800 invalid → Clean import.
Email platforms (Gmail, Outlook, Yahoo) track sender reputation. Sending to invalid addresses lowers your score. Clean email lists = better inbox placement = higher open rates = more revenue.
Example: SaaS company has 20% bounce rate → 35% of emails land in spam. After validation: 1% bounce rate → 92% inbox placement → 2.5x more signups.
Most email platforms charge per contact. Mailchimp charges $50/month for 5,000 contacts. If 15% are invalid (750 emails), you're wasting $7.50/month. At scale: 100k list with 15% invalid = $900/year wasted.
Example: Marketing agency validates client lists → Removes 12,000 invalid emails from 80k list → Saves client $1,440/year in Mailchimp fees.
Check RFC 5322 compliance: proper format (user@domain.com), no spaces, valid characters.
Auto-fix common typos: gmial→gmail, yahooo→yahoo, hotmial→hotmail, outlok→outlook.
Flag temp emails: mailinator, 10minutemail, guerrillamail, throwaway.email.
Verify domain has valid MX records and TLD (.com, .org, not .fake).
Case-insensitive duplicate detection. john@test.com = JOHN@TEST.COM.
Detect and flag empty cells, whitespace-only values, placeholder emails.
Upload your CSV file to neatcsv, select the email column, and click "Validate Emails". The tool checks syntax, fixes common typos, and flags disposable addresses. Free for up to 10,000 emails (Starter plan, 9€/month).
neatcsv validates: 1) Email syntax (RFC 5322 compliance), 2) Domain validity, 3) Common typos (gmial.com→gmail.com), 4) Disposable email providers (mailinator, 10minutemail, etc.), 5) Empty values.
No. Validation checks syntax and format without contacting mail servers. Verification pings the mail server to confirm the mailbox exists. neatcsv performs validation (syntax check) which is instant and doesn't require API keys.
No. All email validation happens in your browser using JavaScript. Your email list never leaves your computer. This ensures maximum privacy and GDPR compliance.
Yes! This is a common use case. Validate your email list with neatcsv, remove invalid emails, then import the clean list to Mailchimp. This reduces bounces and protects your sender reputation.
Syntax validation is 100% accurate. Typo detection catches 50+ common mistakes. Disposable email detection covers 1,000+ providers. Domain checks verify MX records. For mailbox-level verification (does the inbox exist?), you'd need a paid verification service with SMTP pinging.
Reduce bounces, improve deliverability, save money. From 9€/month.
Start Validating Now