Estimate the size of an email and get recommendations to stay within limits.
The Email Size Calculator calculates the exact byte size of your email to prevent "clipping" in Gmail and ensure fast loading for your recipients.
Calculate HTML and Plain Text size
Estimate attachment overhead (Base64)
Gmail "Clipping" threshold warning
Identify largest elements (Images/CSS)
Optimization tips for smaller payloads
Connect multiple emails, Automate emails, manage replies, and track results all in one inbox.