Quick wins for a faster PC:
Scan for outdated or missing drivers - takes under a minuteDriver Scan →Clear out junk files and repair common Windows errorsFree Scan →Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →To test how a web page behaves without a connection, use Chrome DevTools’ Offline network setting. To find out whether DevTools itself works when your computer has no internet, disconnect or block the computer’s network and test it separately. The browser toggle simulates offline page access; it does not establish that every browser or operating-system process is cut off from the network.
First decide what “offline” means
There are two different checks: testing a page under simulated network loss, and testing whether the developer tools remain usable on a machine that is actually disconnected. A browser’s offline emulation is useful for the first. For the second, disconnect the machine or block its network access independently, then open DevTools and try its local panels.
These are practical checks, not a guarantee of system-wide isolation. The browser documentation describes page-testing features; it does not certify that extensions, background services, operating-system processes, or every other network path are blocked.
Test a page with Chrome DevTools’ Offline setting
- Open the page and DevTools before reloading. Select the Network panel. Chrome records activity while DevTools is open, and its request totals cover requests logged since it was opened. See Chrome’s Network panel guide.
- Choose Offline. In the Network panel’s network throttling menu, select Offline. Chrome describes this as simulating a completely offline network experience; a warning icon appears next to Network while the setting is active. See Chrome’s Network features reference.
- Reload or use the page. Observe what still appears and which requests fail or are served locally. Select a request to inspect available details such as headers, payload, response, initiator, and timing.
- Restore the network setting. Choose a connected setting instead of Offline when the test is complete.
Offline is not the same as Disable cache
Disable cache turns off the browser cache to model a first-time visitor. It does not simulate a disconnected network. Choose Offline when the question is whether the page works without a connection. Chrome documents both controls in its Network features reference.
Do these 3 things before closing this tab:
1Clear out junk files and repair common Windows errors2Scan for outdated or missing drivers - takes under a minute3Repair Windows errors before they cause bigger problems#1 Best Overall
- Read Before You Buy — No Video Output: These adapters support charging and USB 2.0 data transfer, but cannot transmit video signals. Except for standard USB webcams (which use USB data only), they are not compatible with HDMI/DisplayPort cables, video-capable USB-C hubs, or docking stations with video output.
- Convert USB-A Ports to USB-C: Designed to connect USB-C earphones, cables, flash drives, card readers, and other USB-C accessories to standard USB-A ports. Plug-and-play with no drivers or software required.
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Exporting a HAR file
If you export the request log for troubleshooting, check it for sensitive information before sharing. Chrome provides a sanitized HAR export that excludes sensitive headers by default, as well as an option to include sensitive data. The same reference describes the export options.
Check whether DevTools itself opens without internet
- Disconnect the computer from the network or block its network access outside the browser’s Offline control.
- Open the browser and DevTools in that disconnected environment.
- Try local functions such as Elements, Sources, and Console. This checks whether the tool is available for local inspection without internet; it does not prove that all software on the computer is isolated.
This separate machine-level check matters because Chrome’s Offline setting is documented as a page-network simulation, not as a control that blocks all browser or operating-system traffic.
Rank #2
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Use Firefox for request inspection or local secure-origin testing
Inspect page requests in Network Monitor
Firefox’s Network Monitor records HTTP requests and their details while the Toolbox is open, even if another Toolbox panel is selected. Open the Toolbox before exercising the page, then inspect the recorded activity. See Mozilla’s Network Monitor documentation.
Map a local folder with Local Mode
Firefox Local Mode can map a local folder to a custom HTTPS origin, which is useful when local-file testing requires secure-origin behavior without starting a separate HTTP server. Mozilla says these mappings work only while DevTools are open; Local Mode is documented as shipped in Firefox 153. It is a local-testing feature, not proof that all Firefox features or all network traffic on the machine have been tested. See Mozilla’s Local Mode documentation.
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Rank #3
- Sleek 7-in-1 USB-C Hub: Features an HDMI port, two USB-A 3.0 ports, and a USB-C data port, each providing 5Gbps transfer speeds. It also includes a USB-C PD input port for charging up to 100W and dual SD and TF card slots, all in a compact design.
- Flawless 4K@60Hz Video with HDMI: Delivers exceptional clarity and smoothness with its 4K@60Hz HDMI port, making it ideal for high-definition presentations and entertainment. (Note: Only the HDMI port supports video projection; the USB-C port is for data transfer only.)
- Double Up on Efficiency: The two USB-A 3.0 ports and a USB-C port support a fast 5Gbps data rate, significantly boosting your transfer speeds and improving productivity.
- Fast and Reliable 85W Charging: Offers high-capacity, speedy charging for laptops up to 85W, so you spend less time tethered to an outlet and more time being productive.
- What You Get: Anker USB-C Hub (7-in-1), welcome guide, 18-month warranty, and our friendly customer service.
Choose the check that matches your question
| What you want to check | Use | What it tells you |
|---|---|---|
| How a page behaves when its connection is unavailable | Chrome Network panel’s Offline setting | How the page responds to Chrome’s simulated offline network experience. |
| Whether a local page can use a custom HTTPS origin | Firefox Local Mode | How a mapped local folder behaves at that origin while DevTools remain open. |
| Which HTTP requests a page makes | Chrome Network panel or Firefox Network Monitor | Request activity recorded while DevTools or the Toolbox is open, subject to each tool’s logging behavior. |
| Whether DevTools can be opened with no internet available | Disconnect or block the machine’s network, then open the tool | Whether DevTools opens and local panels function in that disconnected setup; this is not a vendor-certified system-wide isolation test. |
Browser labels and behavior can change between releases, so check the installed version if a control is named or arranged differently.
Quick Recap
Best Value
- 5-in-1 Connectivity: Equipped with a 4K HDMI port, a 5 Gbps USB-C data port, two 5 Gbps USB-A ports, and a USB C 100W PD-IN port. Note: The USB C 100W PD-IN port supports only charging and does not support data transfer devices such as headphones or speakers.
- Powerful Pass-Through Charging: Supports up to 85W pass-through charging so you can power up your laptop while you use the hub. Note: Pass-through charging requires a charger (not included). Note: To achieve full power for iPad, we recommend using a 45W wall charger.
- Transfer Files in Seconds: Move files to and from your laptop at speeds of up to 5 Gbps via the USB-C and USB-A data ports. Note: The USB C 5Gbps Data port does not support video output.
- HD Display: Connect to the HDMI port to stream or mirror content to an external monitor in resolutions of up to 4K@30Hz. Note: The USB-C ports do not support video output.
- What You Get: Anker 332 USB-C Hub (5-in-1), welcome guide, our worry-free 18-month warranty, and friendly customer service.
Rank #4
- Dual Converters, Infinite Potential：Includes 2× USB C male to USB A female adapters and 2× USB A male to USB C female adapters. Perfect for a wide range of uses—tablets with Bluetooth keyboards, expand USB ports on macbook, and more. Two different converters for all your daily needs
- Next-Level 10Gbps & 3A Charging: No more slow 480Mbps, this usb to usb c adapter has a transfer speed of up to 10Gbps, allowing you to do more transferring in less time. This usb adapter fits both USB A and USB C charger, supporting up to 3A fast charging
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- Please Note: To reach 10Gbps speed, keep the cable under 3.3 ft. For USB A Male to USB C adapters, try flipping the USB C connector. USB C Male to USB A adapters support bidirectional 10Gbps transfer within 3.3 ft
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