How fast is your internet?
Test your download speed, upload speed, latency, and connection quality in seconds.
Why SpeedFox
Browser-Based Accuracy
Measurements run client-side against Cloudflare's global network, using direct multi-stream chunk transfers over warm-up and measurement windows to ensure honest throughput evaluation.
Privacy First Architecture
No login required. We process only minimal parameters to explain connection performance. Your test history is stored locally in your browser.
Comprehensive Tools
Calculate download times for large files, convert bandwidth units, or learn how ping and jitter impact gaming and streaming.
Explore Network ToolsWhat Your Results Mean
Four numbers, four different things. Here's what each one actually tells you about your connection.
Download (Mbps)
How fast data moves from the internet to you: page loads, streaming, downloads. Most home plans are sold on this number alone.
Upload (Mbps)
How fast data moves from you outward: video calls, cloud backups, live streaming. Often much lower than download on the same plan.
Ping (ms)
Round-trip delay to the server. Lower is better; under 30ms is excellent for gaming, over 100ms is noticeably laggy.
Jitter (ms)
How much your ping varies from one moment to the next. High jitter is what causes choppy calls even when average ping looks fine.
Every completed test also grades bufferbloat, how much your ping spikes specifically while the connection is under load, and links out to the full Speed Guide for a deeper explanation of any of these.
What Internet Speed Do You Actually Need?
Recommended speeds by online activity so you can determine if your current internet package is sufficient.
4K Ultra HD Streaming
Buffer-free streaming on Netflix, Prime Video, YouTube, and Disney+ for crisp 4K HDR playback.
Competitive Online Gaming
Low latency and minimal jitter are crucial for fast reaction times in FPS, MOBA, and Battle Royale matches.
HD Video Conferencing
Smooth 1080p group meetings on Zoom, Microsoft Teams, and Google Meet with zero robotic audio stutter.
Remote Work & Large Files
Reliable cloud backups (Google Drive, Dropbox, OneDrive), rapid Git code pushes, and large asset synchronization.
Multi-Device Smart Home
Supporting multiple simultaneous users, smartphones, 4K TVs, smart security cameras, and IoT devices.
Need a Deeper Breakdown?
Read our full analysis of household internet usage, per-user bandwidth sizing, and how ISPs calculate capacity.
How SpeedFox Delivers Unbiased, Accurate Results
Most online speed tests use artificial compression or partner with local ISPs to inflate numbers. SpeedFox is engineered differently.
Multi-Chunk Concurrent Transfers
Modern high-speed connections can easily saturate a single TCP stream. SpeedFox initiates multiple simultaneous HTTP chunk requests across parallel connections to accurately measure your network interface's true throughput ceiling.
TCP Slow-Start Artifact Elimination
When a download begins, the TCP congestion control window starts small and doubles gradually. SpeedFox employs a dedicated 1.5-second warm-up window to discard this ramp-up phase, ensuring calculations reflect sustained real-world speeds.
Global Anycast Edge Network
Rather than relying on a handful of sponsored datacenter servers, SpeedFox routes measurements across Cloudflare's global anycast edge spanning over 300 cities worldwide, testing against the same infrastructure that serves real internet traffic.
Loaded Latency & Bufferbloat Detection
A connection with 200 Mbps download can still feel sluggish if latency spikes whenever a file is transferred. SpeedFox monitors ping stability during active transfer phases to detect excessive bufferbloat in your home router.
Is Your Internet Slower Than Expected?
Perform these 5 quick checks before contacting your internet service provider.
Reboot Hardware
Power off your modem and router for 30 seconds to flush temporary NAT tables and clear stale connection state.
Switch to 5 GHz / Cable
2.4 GHz Wi-Fi is crowded with interference. Connect to 5 GHz or plug in a Cat 6 Ethernet cable for instant speed gains.
Pause Background Apps
Steam updates, cloud backups (iCloud/Dropbox), and OS updates consume bandwidth silently in the background.
Update DNS Servers
ISP default DNS resolvers are often sluggish. Switch your device DNS to Cloudflare (1.1.1.1) or Google (8.8.8.8).
Test Peak Hours
If speeds drop between 7pm and 11pm, your neighborhood node may be congested. Keep a log of tests to present to your ISP.
Featured Guides & Networking Tutorials
What is Mbps vs MB/s?
Understanding the difference between ISP bandwidth numbers (bits) and file download speeds (bytes), and how to convert between them.
What is Ping and Jitter?
Why low latency and stable jitter matter more than raw download speed for online gaming, video calls, and other real-time traffic.
Why is Wi-Fi Slower Than Ethernet?
How radio interference, physical obstacles, and channel congestion degrade wireless speed, and what a cable sidesteps entirely.
How VPNs Affect Speed Tests
Understanding encryption overhead and routing distance, and why your speed test numbers change the moment a VPN is turned on.
Frequently Asked Questions About Internet Speed
Everything you need to know about testing accuracy, connection diagnostics, and improving your throughput.