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maxFontSizeMultiplier works differently between iOS and Android #56578
Description
Description
maxFontSizeMultiplieraffects thefontSizeon both Android and iOS.- When font scaling is set to a value higher than
maxFontSizeMultiplier, both Android and iOS clamp thefontSizevalue - When it comes to
lineHeight, it acts differently. iOS clamps the value while Android ignores themaxFontSizeMultiplierforlineHeight
Please see the screenshots for a side-by-side comparison
Steps to reproduce
- Install he reproducer app with
yarn androidandyarn ios - Take a screenshot of the app so you can compare later
- Increase the font scaling. You can either use the settings app, or
cmd option +on iOS simulator, andadb shell settings put system font_scale <value>on Android - Take another screenshot and compare those two
React Native Version
0.85.2
Affected Platforms
Runtime - iOS, Runtime - Android
Output of npx @react-native-community/cli info
info Fetching system and libraries information...
System:
OS: macOS 15.7.4
CPU: (12) arm64 Apple M4 Pro
Memory: 258.47 MB / 48.00 GB
Shell:
version: 0.109.1
path: /Users/burakguner/.cargo/bin/nu
Binaries:
Node:
version: 24.13.0
path: /Users/burakguner/.nix-profile/bin/node
Yarn:
version: 1.22.22
path: /Users/burakguner/.nix-profile/bin/yarn
npm:
version: 11.6.2
path: /Users/burakguner/.nix-profile/bin/npm
Watchman:
version: 2026.01.19.00
path: /Users/burakguner/.nix-profile/bin/watchman
Managers:
CocoaPods:
version: 1.16.2
path: /Users/burakguner/.local/share/gem/ruby/3.3.0/bin/pod
SDKs:
iOS SDK:
Platforms:
- DriverKit 25.2
- iOS 26.2
- macOS 26.2
- tvOS 26.2
- visionOS 26.2
- watchOS 26.2
Android SDK:
API Levels:
- "30"
- "31"
- "34"
- "35"
- "36"
Build Tools:
- 35.0.0
- 36.0.0
- 36.1.0
System Images:
- android-30 | ARM 64 v8a
- android-34 | Google Play ARM 64 v8a
- android-35 | Google APIs ARM 64 v8a
- android-35 | Google Play ARM 64 v8a
- android-36.1 | Google Play ARM 64 v8a
Android NDK: Not Found
IDEs:
Android Studio: 2025.3 AI-253.32098.37.2534.15232325
Xcode:
version: 26.2/17C52
path: /usr/bin/xcodebuild
Languages:
Java:
version: 21.0.8
path: /Users/burakguner/.nix-profile/bin/javac
Ruby:
version: 3.4.8
path: /Users/burakguner/.nix-profile/bin/ruby
npmPackages:
"@react-native-community/cli":
installed: 20.1.0
wanted: 20.1.0
react:
installed: 19.2.3
wanted: 19.2.3
react-native:
installed: 0.85.2
wanted: 0.85.2
react-native-macos: Not Found
npmGlobalPackages:
"*react-native*": Not Found
Android:
hermesEnabled: true
newArchEnabled: true
iOS:
hermesEnabled: true
newArchEnabled: true
Stacktrace or Logs
N/A
MANDATORY Reproducer
https://github.com/atlj/reproducer-max-font-size-multiplier-line-height
Screenshots and Videos
| Font Scale | iOS | Android |
|---|---|---|
| 1 |  |
 |
| 2.143 |  |
 |
Notice how lineHeight is not clamped on Android screenshots
Activity
atlj commentedon Apr 23, 2026
In my opinion, the
maxFontSizeMultipliername is a bit misleading. It sounds like it should only affect thefontSizeand ignore other types of font properties but that's not the reality. As a developer, I would expect to see the iOS behavior on both platforms while the name is misleading for React Native contributors.Fix lineHeight and letterSpacing ignoring maxFontSizeMultiplier on An…