Title — Desktop & Mobile
50–60 characters / 600px
Google measures pixel width. Titles over 600px are cut off with an ellipsis.
Description — Desktop
~155 characters / 920px
Google may override your description, but keeping it under 920px avoids truncation.
Description — Mobile
~200 characters / 1300px
Mobile SERPs allow slightly more text before cutting the description.
How Google measures
Pixel width, not characters
Wide letters (W, M) count more than narrow ones (i, l). This tool uses Canvas to measure exactly like a browser.