What makes a font readable at phone size
Most people see your thumbnail small. In our measurements, a phone feed shows it 390 pixels wide and the up-next list on a computer only 248 pixels wide. At that size, three things decide whether a font survives:
- Weight. Thick strokes stay visible. Thin strokes turn into grey lines. Always use the heaviest weight you have.
- Simple letter shapes. Open, plain capitals are recognised fastest. Fancy details, joined script and very thin parts get lost.
- Spacing. Letters that touch or overlap merge into one shape. A little space between them keeps each one readable.
Write in capitals. They are all the same height, so a short word in capitals forms a solid block that is easy to spot. Then check it small: the thumbnail preview shows your full design in a mock YouTube feed.
Outline and shadow
An outline separates the letters from whatever is behind them. Without one, white text on a bright photo, or yellow text on a sky, simply disappears. Use a dark outline around light text, or a light one around dark text. Make it thick enough to see at phone size: a thin line that looks fine on your monitor is gone in the feed.
A drop shadow adds depth and lifts the words off the image. A hard shadow, offset down and to the side in the outline colour, gives a bold 3D look. A soft, blurred shadow works better on calm backgrounds. Try both in the preview above with the Drop shadow switch.
How many words
As few as you can. Each extra word makes all the words smaller, because they have to share the same width. One to four words is the usual range. Do not repeat the title: it is printed right under the thumbnail. Use the text to add what the title does not say, such as a number, a result or a feeling. Type a long phrase in the preview and watch the letters shrink; that is what happens in the feed.
Pairing two fonts
One font is usually enough. If you want to set off one word, a number or a name, add a second font that is clearly different, not just slightly different. Pairs that work:
- A condensed font for the phrase with a rounded or comic font for one key word (Anton with Luckiest Guy).
- A heavy sans with a marker font for a handwritten-looking note (Montserrat Black with Permanent Marker).
- The same font in two colours, which often looks cleaner than two fonts.
Keep the main word in the boldest, biggest style. The second font should support it, not compete.
Match the font to your niche