diff --git a/.gitattributes b/.gitattributes
new file mode 100644
index 0000000..6088c22
--- /dev/null
+++ b/.gitattributes
@@ -0,0 +1,8 @@
+* text=auto
+
+# Shell scripts must have LF line endings, even on Windows checkouts.
+*.sh       text eol=lf
+*.command  text eol=lf
+
+# Batch files are Windows-only.
+*.bat      text eol=crlf
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 38e5312..9288ff8 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,12 @@
 
 All notable changes to **Your Everyday Tools** are documented here. The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/), and this project loosely follows [Semantic Versioning](https://semver.org/).
 
+## [0.4.2] — 2026-04-20
+
+### Added
+- **Double-click launchers** — `run.bat` for Windows, `run.command` for macOS, and `run.sh` for Linux. Non-technical users only need to install Python once, then double-click the launcher. It auto-creates a virtual environment, installs dependencies, starts the server, and opens the browser. Close the window to stop.
+- `.gitattributes` pinning LF line endings on shell/command files so the launchers work after a Windows checkout.
+
 ## [0.4.1] — 2026-04-20
 
 ### Fixed
diff --git a/README.md b/README.md
index 9c7407e..4a0dd62 100644
--- a/README.md
+++ b/README.md
@@ -150,11 +150,21 @@ See [CHANGELOG.md](CHANGELOG.md) for release history and recent fixes.
 
 ## Quick Start
 
-### Prerequisites
+### Easy start (recommended — no command line needed)
 
-- **Python 3.10+**
+Install [Python 3.10+](https://www.python.org/downloads/) once (on Windows, tick **"Add Python to PATH"** during install), then:
 
-### Installation
+| OS | What to do |
+|----|-----------|
+| **Windows** | Double-click `run.bat` |
+| **macOS** | Double-click `run.command`. First time only, open Terminal in this folder and run `chmod +x run.command` (macOS strips the executable bit on downloads). |
+| **Linux** | `chmod +x run.sh && ./run.sh` |
+
+The launcher creates a virtual environment, installs dependencies, starts the server, and opens your browser automatically. Close the window to stop. Subsequent runs skip the setup step.
+
+### Manual install
+
+If you prefer full control:
 
 ```bash
 # Clone the repository
@@ -168,11 +178,8 @@ venv\Scripts\activate           # Windows
 
 # Install dependencies
 pip install -r requirements.txt
-```
 
-### Run
-
-```bash
+# Run
 python app.py
 ```
 
diff --git a/run.bat b/run.bat
new file mode 100644
index 0000000..27f1810
--- /dev/null
+++ b/run.bat
@@ -0,0 +1,57 @@
+@echo off
+setlocal
+
+cd /d "%~dp0"
+
+where python >nul 2>nul
+if errorlevel 1 (
+    echo.
+    echo   Python 3.10 or newer is required, but was not found on PATH.
+    echo.
+    echo   Download and install it from:
+    echo       https://www.python.org/downloads/
+    echo.
+    echo   During install, make sure to check "Add Python to PATH".
+    echo.
+    pause
+    exit /b 1
+)
+
+if not exist ".venv\Scripts\python.exe" (
+    echo.
+    echo   First-time setup: creating virtual environment...
+    echo   (this only happens once and takes about a minute)
+    echo.
+    python -m venv .venv
+    if errorlevel 1 (
+        echo.
+        echo   Failed to create the virtual environment.
+        pause
+        exit /b 1
+    )
+)
+
+call ".venv\Scripts\activate.bat"
+
+echo.
+echo   Checking dependencies...
+pip install --quiet --disable-pip-version-check -r requirements.txt
+if errorlevel 1 (
+    echo.
+    echo   Dependency install failed. Check your internet connection and try again.
+    pause
+    exit /b 1
+)
+
+echo.
+echo   ============================================================
+echo     EveryTools is starting at http://localhost:5000
+echo     Your browser will open automatically in a moment.
+echo     Close this window to stop the server.
+echo   ============================================================
+echo.
+
+start "" cmd /c "timeout /t 2 /nobreak >nul && start http://localhost:5000"
+python app.py
+
+pause
diff --git a/run.command b/run.command
new file mode 100755
index 0000000..d63ef8a
--- /dev/null
+++ b/run.command
@@ -0,0 +1,52 @@
+#!/usr/bin/env bash
+# Double-click launcher for macOS (also works as ./run.sh on Linux).
+
+set -e
+cd "$(dirname "$0")"
+
+if ! command -v python3 >/dev/null 2>&1; then
+    echo
+    echo "  Python 3.10 or newer is required, but was not found."
+    echo
+    echo "  macOS:   brew install python        (install Homebrew from https://brew.sh)"
+    echo "  Linux:   sudo apt install python3 python3-venv    (Debian/Ubuntu)"
+    echo "           sudo dnf install python3                  (Fedora)"
+    echo
+    read -p "Press Enter to close..." _
+    exit 1
+fi
+
+if [ ! -d ".venv" ]; then
+    echo
+    echo "  First-time setup: creating virtual environment..."
+    echo "  (this only happens once and takes about a minute)"
+    echo
+    python3 -m venv .venv
+fi
+
+# shellcheck disable=SC1091
+source .venv/bin/activate
+
+echo
+echo "  Checking dependencies..."
+pip install --quiet --disable-pip-version-check -r requirements.txt
+
+echo
+echo "  ============================================================"
+echo "    EveryTools is starting at http://localhost:5000"
+echo "    Your browser will open automatically in a moment."
+echo "    Press Ctrl+C in this window to stop the server."
+echo "  ============================================================"
+echo
+
+# Open the browser after a brief delay, in the background.
+(
+    sleep 2
+    if command -v open >/dev/null 2>&1; then
+        open http://localhost:5000
+    elif command -v xdg-open >/dev/null 2>&1; then
+        xdg-open http://localhost:5000
+    fi
+) &
+
+python app.py
diff --git a/run.sh b/run.sh
new file mode 100755
index 0000000..4676be8
--- /dev/null
+++ b/run.sh
@@ -0,0 +1,6 @@
+#!/usr/bin/env bash
+# Launcher for Linux. Run with: ./run.sh
+# (macOS users: use run.command — identical content, different filename
+#  so Finder recognises it as double-clickable.)
+
+exec "$(dirname "$0")/run.command" "$@"