Font choice determines whether your captions are readable or ignored. Here is what actually works on stream — and what to avoid.
Get Live Captions on Your StreamCaption readability depends on three things: font choice, weight, and contrast. Get all three right and viewers read every word. Get them wrong and captions become visual noise. Here is what works.
Roboto Bold is the most reliable caption font for live streaming. It was designed for screen readability, has excellent legibility at small sizes, and the Bold weight punches through busy gaming backgrounds without needing a heavy text shadow. Google Fonts hosts it for free. This is the default recommendation for StreamTranslate users who are not sure where to start.
Inter is specifically designed for UI text and screen rendering. Its optical adjustments at every size make it exceptionally readable in caption format. Semi-bold (600 weight) or Bold (700) works well for captions. Slightly more modern-feeling than Roboto. Works great on tech, IRL, and talk-format streams.
Open Sans has been battle-tested across web and video for over a decade. The Bold weight reads cleanly even on low-contrast backgrounds. It is slightly wider than Roboto which can be an advantage for shorter caption blocks. A solid choice for any stream style.
Oswald is a condensed sans-serif that fits more text per line without going small on the font size. Medium or SemiBold weight works best for captions. Popular on gaming and esports streams where screen real estate is limited and you want captions that feel native to the gaming aesthetic.
Using system-ui as your font stack means the caption renders in whatever the operating system's default UI font is — San Francisco on Mac, Segoe UI on Windows. It loads with zero delay since no font file needs to be fetched. Good for setups where you want absolutely minimal rendering lag in your captions.
Font weight matters more than font family for caption readability. A Bold weight (700) in any of the fonts above will outperform a Regular weight (400) in any font. The minimum recommended font size for stream captions is 28px at 1080p. Smaller than that and viewers on mobile or small screens will miss words.
Contrast is non-negotiable. White text on a dark semi-transparent background (rgba 0,0,0,0.6 or darker) is the most readable combination for stream captions. Avoid yellow text on light backgrounds, red text of any kind, and fonts with thin strokes at small sizes.
StreamTranslate lets you configure font family, size, weight, and background color directly in the caption settings. The OBS browser source scales with your scene resolution. See the setup guide for configuration options.
Avoid serif fonts (Times New Roman, Georgia) — the thin strokes compress poorly over video. Avoid decorative fonts (any cursive or display typeface) — they fail fast at small sizes. Avoid thin weights (300, Light, Thin) — they disappear on any textured background. Avoid all-caps for long caption blocks — it slows reading speed.
Roboto Bold is the safest choice — designed for screen readability, works at all sizes, and has strong contrast weight. Inter Bold is a close second with slightly more modern character rendering.
Minimum 28px at 1080p resolution. 32-36px is more comfortable for viewers watching on smaller screens or at a distance. Avoid going below 24px — it becomes illegible for many viewers.
A semi-transparent dark background (rgba 0,0,0,0.6 or darker) dramatically improves readability on any streaming background. Pure white text with no background only works reliably on very dark game footage.
Yes. StreamTranslate's caption settings let you configure font family, size, weight, color, and background opacity. The changes apply to the browser source overlay in real time.
Web fonts loaded in a browser source add minimal overhead. Using system-ui eliminates font loading entirely. The our industry-leading speech AI transcription that powers StreamTranslate runs server-side, so font rendering does not affect caption accuracy or latency.