Email Deduplicator
Remove repeated email addresses from pasted lists without manually searching for duplicates.
Free
No account or subscription is required.
Browser-first
The main transformation is performed locally in your browser whenever practical.
No fake verification
Format checks are clearly distinguished from mailbox or deliverability verification.
Responsible email marketing
Use recipients you are permitted to contact, identify the sender clearly, provide appropriate unsubscribe handling and follow the rules that apply to your email provider and audience. MarketZuno preparation tools do not guarantee delivery, inbox placement or campaign performance.
More email tools
Email Cleaner
Clean email lists by trimming spaces, normalizing lowercase addresses, removing blank rows and separating invalid email formats.
Email Syntax Validator
Check email address syntax and separate valid-looking formats from malformed addresses. This does not verify mailbox existence.
Email Subject Line Tester
Review email subject line length, wording, capitalization and common readability issues before sending a campaign.
Email Preheader Generator
Build concise email preheader text to complement your subject line and campaign message.
Email Personalizer
Personalize email subjects and messages using merge fields such as name, company, city and offer.
Email Campaign CSV Builder
Create campaign-ready CSV files from names, email addresses, subjects and personalized email content.