Network Status Checker — Connection Info
Generate a JavaScript snippet to check online/offline status, connection type, downlink speed, and RTT.
How it works
- 1Configure your options above
- 2Click "Generate" — processing happens in your browser
- 3Copy or download the result
What to do next
About Network Status Checker
Network Status Checker is the kind of utility you bookmark and reach for when you need it. Generate a JavaScript snippet to check online/offline status, connection type, downlink speed, and RTT. It loads quickly, works on any modern browser, and produces a result you can download or copy in a single click.
The processing pipeline is straightforward: your input is parsed by standard browser APIs, transformed according to the options you select, and serialised back into a downloadable result. The 0 MB per-file ceiling matches what a typical browser tab can handle without paging to disk.
Network Status Checker sees the most use from creators experimenting with formats and community managers planning posts, but the design is intentionally generic enough that you do not need a specialist background to get a good result. The defaults aim at the most common case so a first-time user can get the right output without changing any settings.
Because everything runs in the page, the tool scales the same way for one user or a million — there is no per-user backend cost. The page is static, the engine is the same JavaScript bundle for every visitor, and the work happens on the visitor's own device. That keeps the tool free and keeps it fast on the first interaction.
Reach for Network Status Checker when you need a predictable result on a single file. The page works on the first visit, the controls are visible without a menu, and the output is delivered the moment the engine finishes.
Output handling is intentionally boring: Network Status Checker produces a single output file and triggers your browser's standard "save" behaviour. If you have a default download folder configured, that is where it will land. There is no Favtoo-side history of jobs you have run.
The architecture imposes only the limits the browser itself imposes. The published 0 MB ceiling is conservative; most modern devices comfortably handle inputs up to that size, and the cap exists so the tool degrades gracefully on phones and budget laptops rather than running out of memory.
Once you have used Network Status Checker, the natural next steps depend on what you are doing with the result. Common follow-ups include Battery Status, WebGL Detector, and Ad Blocker Detector. These are surfaced on the page so you do not have to hunt the catalog manually.
Network Status Checker is built around steady iteration on a small set of options rather than feature creep. Every additional setting attracts a slightly different audience, but a long settings panel makes the common case slower for everyone. The current controls reflect what users of the tool actually use.
Network Status Checker is one example of a broader pattern: utility software increasingly works as single-page, client-side experiences. Every page in the catalog is shaped that way, which keeps each tool fast to load and easy to recommend in a single link.
Network Status Checker fits the gap where opening a desktop app feels heavy and writing a script feels overkill. The page handles the common web and productivity utility task with sensible defaults so a single visit usually completes the job; for highly specialised work, a dedicated desktop application can offer more knobs to turn.
Pro tip: Network Status Checker works just as well in a private/incognito window as in a normal one, which is occasionally useful when you want zero browser-history footprint of the job. Another tip: if the tool ever feels slow, it is almost always because the browser tab is competing for CPU with another tab — pausing or closing the heavy ones gives the engine room to work.
When something goes wrong, the cause is usually one of three things: a malformed input, a browser that is out of memory, or a corporate proxy that is interfering with the page's static assets. The first two are easy to diagnose; the third typically requires asking your IT team to allow standard browser APIs to load.
That is essentially everything Network Status Checker does and how it does it. Open the tool above, drop in your input, and the work happens in the page. If you find yourself reaching for it often, bookmark the page — it loads quickly on subsequent visits, and your most-recent settings are remembered for the rest of the session.
How it works
- 1Open Network Status Checker in your browser. The page loads quickly and the tool is ready to use the moment it becomes interactive.
- 2Drop a web utility file onto the upload area, or click to pick one from your device.
- 3Adjust the options to match what you need. Sensible defaults cover the most common case, so you can usually skip this step.
- 4Click to start the job. The engine (standard browser APIs) processes the input in the page; you can watch the progress indicator until it completes.
- 5Grab the output as soon as the run completes. You can also copy the result instead of downloading if the next tool in your workflow accepts pasted input.
- 6Run additional jobs as needed. The same controls and defaults apply on every run.
Common use cases
- Generate a campaign asset in seconds for a quick test using Network Status Checker.
- Generate a temporary asset for a social post.
- Audit a marketing page before launch.
- Compare two product variations side by side.
- Validate a setting before circulating it to a team.
- Run a one-off check during a meeting without context-switching.
- Run a fast accessibility check before publishing.
- Sanity-check a webhook response while debugging.
FAQ
What connection info is available?
Effective type (4g/3g/2g), downlink speed in Mbps, round-trip time, and data saver status.
Which browsers support Network Information?
Chrome, Edge, and Opera support it. Firefox and Safari do not expose connection details.
Is navigator.onLine reliable?
It detects physical connectivity but cannot guarantee internet access — a router without WAN still shows online.
Can it detect network changes?
Yes — the snippet includes listeners for online/offline and connection change events.
What is effectiveType?
A string ("slow-2g", "2g", "3g", "4g") representing the effective connection quality.
Private?
Yes — the code runs entirely in your browser.
Will Network Status Checker ask me to pay to download the result?
Network Status Checker is free to use. The processing runs in your browser, which keeps the per-user cost low enough that the tool can be offered openly. The download is the same file the engine produced — you can use it for as many runs as you need.
Which file formats does Network Status Checker accept?
The accepted formats are listed in the upload area on the tool itself. If your input is in a format that is not directly supported, convert it first using one of Favtoo's converter tools — every Favtoo converter outputs a file that is a clean input to the next tool in the chain.
Is it safe to use Network Status Checker on confidential files?
Your file is processed inside your browser by standard browser APIs. The engine reads the file's bytes from your tab's memory, computes the result, and writes the result back into the tab. You can confirm what the page does by opening developer tools and watching the Network tab during a run — the requests you see are for the tool's static assets only.
Can I trust the output of Network Status Checker for important work?
Network Status Checker is built on standard browser APIs, which is the same class of engine used by professional web and productivity utility pipelines. For deterministic operations, the output is byte-identical to what an equivalent CLI run would produce; for operations involving a codec or a model, the result is well within the range of what comparable tools generate. If you have a specific reference output you need to match, run a small test job first to confirm the configuration produces what you expect.
Can I call Network Status Checker from a script?
Network Status Checker is a browser-only tool by design and does not expose a hosted API. The reason is the same as the privacy story: there is no Favtoo backend doing the work, so there is no service to call. If you need to script the same transformation, the underlying engine (standard browser APIs) is open-source and can be used directly from your own code.
What should I do if Network Status Checker fails on my file?
Failures usually fall into one of three buckets: the input is in an unsupported format, the input is over the size cap, or the input is structurally malformed (a truncated download, a partial export, or a stream the engine does not recognise). The first two are easy to confirm — check that your file is in a supported format and that it is below 0 MB. For the third, opening the file in its native viewer first is the fastest way to confirm the source is intact.
How long does Favtoo retain my data after using Network Status Checker?
Favtoo keeps no copy of your file because Favtoo never receives your file. Network Status Checker runs entirely in your browser, the input is held only in your tab's memory, and closing the tab discards it. There is no opt-in cloud history, no "recent jobs" panel synced to an account, and no server-side retention to configure — the architecture simply has nowhere for your file to be stored.