---
title: "Show which characters a font can't render - Sign Customiser Changelog"
description: "Changelog: Show which characters a font can't render. Learn about the latest updates and improvements to Sign Customiser."
url: "https://www.signcustomiser.com/changelog/show-unsupported-characters-in-sign-text/"
last_updated: "2026-09-03"
---

Sign Customiser now tells customers exactly which characters in their text the chosen font can’t render, instead of a generic “invalid characters” warning. The same check has been extended across every sign type and runs again at add-to-cart, so orders with unrenderable text can no longer slip through to the merchant.

## What’s Changed

- **Specific character feedback** - The “invalid characters” message now lists the exact glyphs the font is missing, so customers know whether to fix a typo, swap a symbol, or pick a different font
- **Coverage across all sign types** - Font glyph validation previously only ran for material-length pricing; it now runs for every sign that uses customer-typed text
- **Add-to-cart safety net** - If an unsupported character slips past the live warning, the customiser now blocks add-to-cart and surfaces the same specific message, preventing unrenderable orders from reaching the merchant
- **Updated default label** - The default invalid-characters label includes a `{characters}` placeholder so merchants who customise the wording still see the offending characters listed in their own copy

## Sitemap

See the full [sitemap](/sitemap.md) for all pages.