QuickDrop

A simple, no-nonsense way to transfer files between your Mac and Android phone. No cloud uploads, no account signups, no app installations (mostly). Just your devices talking directly to each other.

I built this because I was tired of emailing files to myself or uploading stuff to Google Drive just to move a video from my laptop to my phone. There had to be a better way — turns out there are two.

Two Ways to Transfer

Pick whichever suits your situation. I usually use WiFi for quick stuff and USB when I'm moving large videos or folders.

Method 1: WiFi Transfer

This runs a tiny web server on your Mac. You open a webpage on your phone's browser and drag-drop files either direction. Dead simple.

What You'll Need

• Mac and Android on the same WiFi network
• Python 3 (comes pre-installed on Mac)
• 2 minutes of your time

Setup

1. Clone or download this repo

git clone https://github.com/YOUR_USERNAME/QuickDrop.git
cd QuickDrop

2. Create a virtual environment

This keeps dependencies isolated and avoids module conflicts:

python3 -m venv .venv
source .venv/bin/activate

You'll see (.venv) appear at the start of your terminal prompt — that means it's active.

3. Install the dependencies

pip install flask qrcode Pillow waitress

4. Run it

python3 file_transfer.py

Note: Every time you open a new terminal window, you'll need to activate the virtual environment again with source .venv/bin/activate before running the script.

You'll see something like this:

==================================================
  ⚡ QuickDrop - File Transfer Server
==================================================

  📁 Shared folder: /Users/you/Downloads/PhoneTransfer

  🌐 Open this URL on your Android phone:

     http://192.168.1.42:5000

  📱 Or scan the QR code below:

     █████████████████
     █████████████████
     █████████████████
     
==================================================
  Press Ctrl+C to stop the server
==================================================

  🚀 Running with Waitress (production server)
     Expected speeds: 30-100+ MB/s on 5GHz WiFi

4. Connect your phone

Either scan the QR code with your camera, or just type that URL into Chrome on your phone.

How to Use It

Sending files from Android to Mac:

• Tap "Select Files" or drag-and-drop onto the upload zone
• Files land in ~/Downloads/PhoneTransfer on your Mac
• Large files (1GB+) are automatically chunked for reliable uploads

Sending files from Mac to Android:

• Drop files into ~/Downloads/PhoneTransfer on your Mac
• Refresh the page on your phone
• Tap "Download" next to any file

Troubleshooting

Can't connect from phone?

• Double-check both devices are on the same WiFi network
• Try turning off your Mac's firewall temporarily (System Preferences → Security → Firewall)
• Make sure you're using the right IP address (it changes if you switch networks)

Slow speeds?

• Check if you're on 5GHz WiFi (Settings → WiFi → tap your network)
• Move closer to your router
• Close other bandwidth-heavy apps

File not found errors on download?

• This can happen with filenames that have special characters
• Try renaming the file to something simpler (no parentheses, brackets, etc.)

Large uploads failing?

• The app uses chunked uploads (10MB pieces) to handle large files
• If it still fails, your browser might be running low on memory
• For very large files (3GB+), USB transfer is more reliable

Method 2: USB Transfer

This uses ADB (Android Debug Bridge) over a USB cable. It's faster and more reliable for large files, but requires a bit more setup the first time.

What You'll Need

• USB-C to USB-C cable (or USB-C to USB-A, whatever fits your Mac)
• Homebrew (Mac package manager)
• About 5 minutes for first-time setup

First-Time Setup

You only need to do this once.

Step 1: Install Homebrew (if you don't have it)

Open Terminal and run:

/bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"

Follow the prompts. This takes a couple minutes.

To verify it worked:

brew --version

Step 2: Install ADB

brew install android-platform-tools

Verify it's installed:

adb --version

Step 3: Enable Developer Options on your Android phone

This is a hidden menu that you need to unlock:

1. Open Settings
2. Scroll down to About Phone
3. Find Build Number
4. Tap it 7 times rapidly

You'll see a toast message saying "You are now a developer!" (or something like that).

Step 4: Enable USB Debugging

1. Go back to Settings
2. You'll now see Developer Options (usually near the bottom, or under System)
3. Open it and scroll to find USB Debugging
4. Turn it ON
5. Confirm the warning prompt

Step 5: Connect and authorize

1. Plug your phone into your Mac with the USB cable
2. A prompt will appear on your phone: "Allow USB debugging?"
3. Check "Always allow from this computer"
4. Tap Allow

Step 6: Verify the connection

On your Mac, run:

adb devices

You should see your device listed:

List of devices attached
RZCWA1WSYLF    device

If it says "unauthorized" instead of "device", check your phone — the permission prompt might be waiting.

How to Use It

Send a file to your phone:

adb push /path/to/file.mp4 /sdcard/Download/

Send an entire folder:

adb push ~/Downloads/MyFolder /sdcard/Download/

Pull a file from your phone:

adb pull /sdcard/DCIM/Camera/photo.jpg ~/Desktop/

Pull all your photos:

adb pull /sdcard/DCIM/Camera/ ~/Desktop/CameraBackup/

List files on your phone:

adb shell ls /sdcard/Download/

Common Android Folders

Troubleshooting

"no devices/emulators found"

• Is USB debugging enabled?
• Try a different USB cable (some cables are charge-only)
• Try a different USB port
• Unplug and replug the cable

"unauthorized"

• Check your phone for the "Allow USB debugging?" prompt
• If you dismissed it, unplug and replug the cable

Transfer seems stuck

• Large files take time — a 2GB file at 40 MB/s takes about 50 seconds
• ADB shows progress, just wait for it

Video Playback Issues

If a video transfers successfully but won't play on your phone, it's probably a codec issue, not a corrupt file.

Modern videos often use x265/HEVC or 10-bit color, which the default Android video player can't handle.

Solution: Install VLC for Android from the Play Store. It plays basically everything.

To make VLC the default player:

1. Open your file manager
2. Long-press on a video file
3. Tap "Open with"
4. Select VLC
5. Choose "Always"

Quick Reference

WiFi Method

# Activate virtual environment (do this first!)
source .venv/bin/activate

# Start server
python3 file_transfer.py

# Files go to/from: ~/Downloads/PhoneTransfer

USB Method

# Mac → Phone
adb push file.mp4 /sdcard/Download/
adb push ~/folder /sdcard/Download/

# Phone → Mac
adb pull /sdcard/Download/file.mp4 ~/Desktop/
adb pull /sdcard/DCIM/Camera/ ~/Desktop/Photos/

# Browse phone files
adb shell ls /sdcard/

License

MIT — do whatever you want with it.

Acknowledgments

Built out of frustration with existing solutions. Sometimes the simplest approach is the best one.