scrcpy — Display and Control Android Devices from Your Desktop

Introduction

scrcpy (short for "screen copy") lets you display and control Android devices connected via USB or over TCP/IP from a desktop computer. It works on Linux, Windows, and macOS without requiring root access on the device, making it a go-to tool for Android developers testing apps or anyone who wants to operate their phone from a larger screen.

What scrcpy Does

• Mirrors the Android device screen in real time with low latency (typically 35-70 ms)
• Supports mouse and keyboard input to control the device remotely
• Forwards audio from the device to the computer (Android 11+)
• Records the device screen to MP4 or MKV files
• Mirrors the device camera as a webcam feed on the desktop

Architecture Overview

scrcpy consists of a lightweight server component (a Java application pushed to the device via adb at runtime) and a native client built on SDL2 and FFmpeg. The server captures the device screen using the Android MediaCodec API, encodes it to H.264 or H.265, and streams the frames over a socket connection. The client decodes and renders the video with minimal buffering. Control events (touch, keyboard, clipboard) are sent back over a separate socket. No installation or configuration is needed on the Android side beyond enabling USB debugging.

Self-Hosting & Configuration

• Enable USB debugging in Android Developer Options before first use
• Install via package managers: apt, brew, choco, or scoop depending on OS
• Configure resolution with --max-size 1024 to reduce bandwidth on slower connections
• Set bit rate with --video-bit-rate 2M for constrained networks
• Use --no-audio to disable audio forwarding when only the display is needed

Key Features

• Zero installation on the device — the server binary is pushed and cleaned up automatically
• Works over USB and Wi-Fi with the same command-line interface
• Copy-paste synchronization between computer and device clipboards
• OTG mode for physical keyboard/mouse passthrough without mirroring
• Supports multiple devices simultaneously with --serial selection

Comparison with Similar Tools

• Vysor — freemium Chrome-based mirroring with lower quality on the free tier; scrcpy is fully open source with no watermarks
• AirDroid — cloud-dependent with account registration; scrcpy works locally with no internet required
• Samsung DeX — limited to Samsung devices and requires a compatible monitor; scrcpy supports any Android device
• QtScrcpy — GUI wrapper around scrcpy with added features like key mapping for gaming

FAQ

Q: Does scrcpy require root access on the Android device? A: No. It only requires USB debugging to be enabled in Developer Options.

Q: Can I use scrcpy wirelessly without ever connecting a USB cable? A: You need an initial USB connection to configure adb tcpip, or you can pair wirelessly on Android 11+ using adb pair.

Q: Does scrcpy work with iOS devices? A: No. scrcpy is designed exclusively for Android devices using the ADB protocol.

Q: What is the typical latency? A: Over USB, latency is around 35-70 ms depending on device and encoding settings. Wi-Fi adds some overhead depending on network quality.

Sources

• https://github.com/Genymobile/scrcpy
• https://github.com/Genymobile/scrcpy/blob/master/doc/video.md