# Font Availability Checker — Which Fonts Can This Browser Render?

> Test which system fonts are actually available before you rely on them in a font stack.

A font stack only helps if the fonts in it exist on the reader's machine. This checker renders a probe string in each candidate font and compares its width against the generic fallback — if the widths match, the font is not installed and the browser silently substituted. It tests around 60 common system fonts.

**URL:** https://convertto.tech/t/font-availability-checker
**Category:** Browser & Device (https://convertto.tech/c/browser-tools)
**Privacy:** Runs entirely in the browser; no upload
**Cost:** Free, no sign-up
**Last updated:** 2026-08-01

## Key facts

- **Privacy:** Runs entirely in your browser — nothing is uploaded
- **Cost:** Free, unlimited, no sign-up

## How to use

1. Select one or more font groups.
2. The result appears immediately — copy or download it.

## FAQ

### Why does a font I definitely have show as missing?

Safari and Firefox both ship anti-fingerprinting modes that restrict font enumeration to a standard set, because the exact list of installed fonts is unusually identifying. In those modes the measurement genuinely cannot tell the difference, so "not installed" means "not detectable".

### Does this detect web fonts?

No, and that is intentional — it measures what is available locally. A web font loaded via @font-face will render fine for everyone regardless of what this reports, since the browser downloads it.

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