ProtonMail Font Enhancer

A powerful extension that allows users to comprehensively adjust the typography of ProtonMail email content.

Install Extension

Features

Font Size Control

Independently adjust ProtonMail email content font size (from 80% to 200%)
Does not affect other parts of the user interface

Typography Optimization

Letter spacing adjustment (-0.1em to 0.3em): Solves issues with crowded letters
Line height control (1.2 to 2.0): Provides a more comfortable reading experience

Preset Options

Standard Mode: Default settings (100% font size, 0 letter spacing, 1.4 line height)
Enhanced Readability: Larger font size with appropriate letter spacing and relaxed line height
Compact Mode: Smaller font size (90%) with compact spacing
Large Print: Maximum font size (150%) and line height, designed for visually impaired users

Other Features

Settings persist across sessions
Real-time preview of adjustments
Clean and intuitive tabbed interface
Automatic email content height adaptation

Installation

From Chrome Web Store (Not Yet Published)

Visit the Chrome Web Store
Search for "ProtonMail Font Enhancer"
Click "Add to Chrome"

Developer Mode Installation

Download and extract this repository's ZIP file
Open Chrome browser, enter chrome://extensions/
Enable "Developer mode" in the top right corner
Click "Load unpacked extension"
Select the extracted folder