Email size checker
Measure raw HTML and text byte size.
Your inputs stay in this browser. No account needed.
Your result
Add your inputs, or try the example, to see your result here.
Real MIME headers, encodings and attachments add bytes; Gmail clipping is commonly around 102 KB of HTML but is not guaranteed.
How to use this tool
- Counts UTF-8 bytes for the supplied content.
What the result tells you
- Real MIME headers, encodings and attachments add bytes; Gmail clipping is commonly around 102 KB of HTML but is not guaranteed.