---
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: "2026-10-22"
---

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

- [feature](/changelog/tag/feature/)
- [fix](/changelog/tag/fix/)

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## Previousupdates

[View all updates](/changelog/)

- [May 4, 2026Vertical writing for Chinese-Japanese-Korean signsBuild customisers for Japanese, Traditional Chinese, Korean, and traditional Mongolian signs with top-down text columns and merchant-controlled reading direction.feature](/changelog/vertical-writing-for-chinese-japanese-korean-signs/)
- [May 3, 2026Address sign numbers with vertical stacked textCreate a dedicated address number customiser with vertical stacked text, perfect for door numbers, house plaques, and stacked signage where each character sits on its own line.feature](/changelog/address-sign-numbers-with-vertical-text/)
- [April 29, 2026Light and Tokyo Night theme presets for customiser coloursApply a polished colour scheme to your customiser in one click with new Light and Tokyo Night theme presets, then fine-tune individual colours from there.feature](/changelog/light-and-dark-theme-presets-for-customiser-colours/)
- [April 22, 2026Measurement labels on the lightbox 3D previewWidth, height, and depth labels now appear directly on the lightbox 3D visualiser, giving customers an instant sense of scale as they design their sign.feature](/changelog/lightbox-measurements-on-3d-preview/)

[View all updates](/changelog/)

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