fakewindowsize

Python module to generate realistic screen resolutions.

Generate random but statistically accurate screen resolutions based on real-world usage data from StatCounter. Perfect for web scraping, testing, and generating realistic browser fingerprints.

Note on terminology: the data source is StatCounter's screen resolution stats (i.e. screen.width × screen.height, the physical display size), not the browser viewport / window inner size (window.innerWidth). For most fingerprinting use cases the screen resolution is exactly what you want.

Features

• 📊 Real-world data: Uses screen resolution statistics from StatCounter (defaults to the previous, complete year)
• 🎲 Weighted random selection: More common resolutions are more likely to be returned
• 💾 Smart caching: Caches data locally (with a TTL) to minimize network requests
• 📱 Multi-device support: Includes desktop, tablet, and mobile resolutions
• 🌍 Configurable: Choose the year, region and device mix
• 🔒 Proxy support: Configure HTTP proxies for data fetching

Installation

pip install fakewindowsize

Or with uv:

uv add fakewindowsize

Usage

Basic usage

import fakewindowsize

f = fakewindowsize.FakeWindowSize()

# Get a random, statistically realistic window size
width, height = f.get_random_window_size()
print(f"{width}x{height}")  # e.g., (1920, 1080)

Choosing year / region / device

# US desktop resolutions from the 2024 dataset
f = fakewindowsize.FakeWindowSize(year=2024, region="us", device="desktop")
width, height = f.get_random_window_size()

• year: StatCounter yearly dataset (defaults to the previous calendar year, which is always complete).
• region: StatCounter region code (ww, us, eu, ...).
• device: +-joined device types (desktop+tablet+mobile, desktop, mobile, ...).
• cache_ttl_days: how long the local cache stays fresh (default 30; None to never expire).
• request_timeout: seconds before an HTTP request times out (default 30).

Each parameter combination is cached in its own file, so different regions/years never clobber each other.

With proxy support

f = fakewindowsize.FakeWindowSize()

proxies = {
    'http': 'http://proxy.example.com:8080',
    'https': 'http://proxy.example.com:8080',
}

data = f.scrape_window_size_dict(request_proxies=proxies)

How it works

1. Fetches screen resolution statistics from StatCounter's global database
2. Converts market share percentages into a cumulative distribution
3. Uses weighted random selection to pick resolutions based on real-world usage
4. Caches data locally (~/.fakewindowsize-<device>-<region>-<year>.json) to reduce network requests
5. Returns resolution as a tuple of (width, height)

Data source

Screen resolution data is sourced from StatCounter Global Stats, which tracks browser usage across desktop, tablet, and mobile devices worldwide.