Email Size Checker

Prevent email bounce backs

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About Email Size Checker

Prevent email rejection by calculating the exact bytes your email will consume in transit. Native file sizes are deceiving because ISPs use Base64 encoding which inflates attachments by ~33%. Drop your attachments and paste your text to get an accurate reading against standard 10MB and Gmail 25MB limits.

Email Size Checker Features

  • Calculates Base64 SMTP overhead (+33%) automatically
  • Factor in raw text encoding bytes
  • 100% Client-Side Privacy
  • Warns on standard 10MB/25MB provider limits

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