Screen Resolution Checker — JS Snippet
Generate a JavaScript snippet to detect screen resolution, available area, DPI, and display category.
How it works
- 1Configure your options above
- 2Click "Generate Detection Script" — processing happens in your browser
- 3Copy or download the result
What to do next
About Screen Resolution Checker
Screen Resolution Checker is shaped around how people actually use web and productivity utility utilities online: open the page, drop in a file, get the result. Generate a JavaScript snippet to detect screen resolution, available area, DPI, and display category. The interface stays out of the way once the work begins so the engine can use the available CPU and memory for the actual transformation.
If you fit any of these descriptions, Screen Resolution Checker should slot cleanly into your workflow: analysts pulling lightweight reports; community managers planning posts; product managers comparing options. The tool keeps the controls focused on what matters for each of these use cases.
Screen Resolution Checker runs the entire transformation inside your browser. The file is read by JavaScript running in the page, processed in-memory by standard browser APIs, and written back as a download. The browser is the runtime; the page is the interface. You can confirm what the tool does by opening the developer-tools Network tab during a run — the only requests are for the page's own static assets.
Behind the controls you see, standard browser APIs is doing the actual web and productivity utility. Formats are detected on load and the engine produces a deterministic output for any given input + options combination — useful when you need to re-run a job and expect identical results.
Most people land on Screen Resolution Checker via a search at the moment they actually need the tool. That shapes the design: the page is a single screen with the input on one side, the controls in the middle, and the result on the other, so a first-time visitor can complete the job without reading documentation.
Screen Resolution Checker is intentionally narrow in what it does, which makes it easy to slot into a longer workflow. Take its output, hand it to whichever next tool fits the job, and Screen Resolution Checker stays out of your way until the next time you need it.
The download is delivered as a clearly named file the moment processing completes — no email link, no "your result will be ready in 5 minutes" queue, no expiry timer. The file is generated in your browser and saved by your browser's normal download flow.
On limits: 0 MB per file is the ceiling. Output formats and quality settings are listed in the controls panel above, and they apply to every run.
Screen Resolution 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.
Some context on why Screen Resolution Checker exists in this form: modern File APIs, high-performance JavaScript engines, and well-maintained open-source libraries now make it possible to perform web and productivity utility work entirely in the browser. Screen Resolution Checker is built on top of that capability, which is why a single page can host the full pipeline.
If you want to get the most out of Screen Resolution Checker, three small habits help. Drag-and-drop is faster than the file picker once you get used to it. The keyboard shortcut for downloading the result is whatever your browser uses for "save link as," because the result is a normal download. And if you are working on a sensitive file, processing in an Incognito or Private window is a good extra layer — it leaves no trace in browser history when the tab closes.
If Screen Resolution Checker appears to hang, the engine is almost certainly still working — large inputs simply take longer to process inside a browser than they would on a server with multi-core scheduling. For inputs near the 0 MB cap, give it up to a minute on a typical laptop before assuming something is stuck.
Screen Resolution Checker produces deterministic output: the same input plus the same options always produces the same result. That predictability matters when the result has to match an upstream specification or be reproducible later.
Screen Resolution Checker is one of many single-purpose tools in the catalog. Each is built around the same single-page model. Use this one, close the tab, and come back the next time you need the same job done. None of the tools require prior knowledge of the others — each page is self-contained.
How it works
- 1Reach the Screen Resolution Checker page in your browser to begin.
- 2Add your web utility input by dropping it onto the page or browsing for it.
- 3Adjust the options to match what you need. Sensible defaults cover the most common case, so you can usually skip this step.
- 4Trigger processing. standard browser APIs reads your input, applies the transformation, and writes the result back into the page.
- 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.
- 6Re-run with different settings as often as you want. Each run produces a fresh output and the original file on disk is never modified.
Common use cases
- Generate a temporary asset for a social post using Screen Resolution Checker.
- Pull a quick reference number for a status update.
- Plan content without paying for a SaaS dashboard.
- Preview how a result looks before deploying it.
- Audit a marketing page before launch.
- Run a one-off check during a meeting without context-switching.
- Sanity-check a webhook response while debugging.
- Compare two product variations side by side.
- Generate a campaign asset in seconds for a quick test.
- Validate a setting before circulating it to a team.
FAQ
Why a script?
Screen properties require the screen API which is only available in a browser environment.
What is detected?
Width, height, available area, orientation, aspect ratio, DPI, and physical resolution.
Screen vs viewport?
Screen is the physical display; viewport is the browser content area. Use the viewport checker for the latter.
Private?
Yes — runs locally.
Retina detection?
devicePixelRatio > 1 indicates a HiDPI/Retina display.
Categories?
Screens are categorized as Mobile, Tablet, Small Laptop, QHD, Full HD, or 4K based on width.
Does Screen Resolution Checker work on a phone or tablet?
Screen Resolution Checker runs in any modern mobile browser — Safari, Chrome, Firefox and the in-app browsers in most messaging apps all support the underlying APIs. Performance depends on the device: a recent phone handles typical inputs nearly as fast as a laptop, while older devices may take a few seconds longer near the 0 MB ceiling. The interface lays out cleanly on small screens, so you do not need to pinch-zoom to see the controls.
Will Screen Resolution Checker ask me to pay to download the result?
Screen Resolution 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.
Why is my browser prompting me when I open Screen Resolution Checker?
Screen Resolution Checker only needs the standard web platform — file picker access for the inputs you choose to load, and optionally clipboard access if you copy the result rather than downloading it. There is no microphone, camera, geolocation or background-permission request, because none of those are needed for the work the tool does.
Does Screen Resolution Checker require a browser extension or plug-in?
No installation is needed. Screen Resolution Checker runs as a normal web page, with no browser extension, no native helper, and no separate desktop client to download. That is partly a privacy choice — extensions can request broad permissions, while a regular page is sandboxed by default — and partly a convenience one: you can use Screen Resolution Checker on any computer you have temporary access to without leaving anything installed on it.
How accurate is Screen Resolution Checker?
Screen Resolution 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.
Which browsers are supported by Screen Resolution Checker?
Screen Resolution Checker works in any modern browser released in the last few years — Chrome, Edge, Firefox, Safari, Brave, Arc and the major Chromium derivatives are all supported. The underlying engine relies on widely-supported web APIs, so there is nothing exotic to install. If you are on a very old browser version and the tool fails to load, updating to the latest release of your preferred browser is the only fix needed.
Is the source for Screen Resolution Checker available?
Screen Resolution Checker is a static page running an open-source engine in your browser, so a typical corporate firewall does not get in the way as long as it allows JavaScript to load from Favtoo. For teams that need to host it themselves on an internal network, the underlying engine (standard browser APIs) is open-source and can be packaged into a private build with the same behaviour. Reach out via the Contact page if that is something you are exploring.
Does Screen Resolution Checker have an API?
Screen Resolution 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.