Thumbnail Text Size Calculator

Ensure your thumbnail text is readable on ALL devices - especially mobile

No Login Required Mobile Optimized Legibility Score

70% of YouTube Views Are on Mobile!

If your thumbnail text isn't readable on a 5-inch phone screen, you're losing 70% of potential clicks. Use this tool to calculate the minimum font size for perfect readability.

70%

Mobile viewers

Calculate Optimal Text Size

Thumbnail Width (pixels) YouTube standard: 1280px

Thumbnail Height (pixels) YouTube standard: 720px

Text Content Length

Your Text (optional - for preview)

Font Size Recommendations

Device Previews

Legibility Score

Thumbnail Text Best Practices

DO

Use bold, thick fonts (Arial Black, Impact, Montserrat Bold)
Add stroke/outline (3-5px) for contrast
Use ALL CAPS for maximum impact
Keep text to 1-6 words max
Test on actual phone before publishing
Use high contrast colors (white text on dark bg)

DON'T

Use thin fonts (they disappear on mobile)
Use cursive or script fonts (hard to read)
Put text over busy backgrounds
Use more than 2 font sizes per thumbnail
Make text smaller than 60px
Use low contrast colors (light gray on white)