Browser Feature Detector — API Support Check
Generate a JavaScript snippet that checks 30+ browser API features including WebGL, Workers, WebRTC, and more.
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 Browser Feature Detector
Browser Feature Detector performs browser feature detector as a focused single-page utility. Generate a JavaScript snippet that checks 30+ browser API features including WebGL, Workers, WebRTC, and more. Defaults are tuned for the common case so the first run is one click, with every option that matters exposed for the moments you need to fine-tune the result.
Browser Feature Detector is shaped around the recurring needs of two audiences: community managers planning posts, who use it as a quick utility between bigger tools, and marketers running campaigns, who use it as their primary way of getting the job done. Both groups get the same defaults and the same speed.
The right moment to reach for Browser Feature Detector is when you have a focused web and productivity utility job that fits inside a browser tab. Open the page, drop in the file or paste your input, choose the options that matter, and the tool returns the result.
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.
Browser Feature Detector is structured so the question "where is my file processed?" has a single answer: in your browser tab. The engine, the controls, and the result panel are all on one page. Navigating away or closing the tab clears the page's memory the way it does for every other tab.
Browser Feature Detector 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 Browser Feature Detector stays out of your way until the next time you need it.
The hard constraints are easy to remember. Maximum input: 0 MB. Multiple files per run: no — one input at a time, by design, to keep results predictable. The same controls apply on every run.
Browser Feature Detector is honest about scope: it handles a single, well-defined web and productivity utility step. Specialist edge-case work — uncommon formats, very large inputs, or pipelines that need scripting — is what dedicated desktop apps are for. This page handles the common case quickly.
Output handling is intentionally boring: Browser Feature Detector 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.
Browser Feature Detector 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.
Browser Feature Detector runs as a regular web page, so there is no install step or permission grant before the first run. The page can be audited by viewing the source or by watching the developer-tools Network tab while a job runs.
Pro tip: Browser Feature Detector 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.
If the result is not what you expected, the most common causes are easy to check. Confirm the input is under the 0 MB ceiling — files just above the cap fail silently because the engine refuses to allocate the buffer. Confirm the input is one of the supported formats. And if the page itself feels slow, try closing other heavy tabs to free up memory; the engine runs in your browser, so it competes for the same resources as everything else open.
That is the whole tool. Use Browser Feature Detector for as long as it stays useful to you, and if it does, the catalog has many more tools built the same way. Each applies the same single-purpose discipline, so the way you used this page transfers to the next one you try.
How it works
- 1Land on the Browser Feature Detector page. The tool is ready to use the moment the page renders.
- 2Add your web utility input by dropping it onto the page or browsing for it.
- 3Tweak the controls if the defaults are not quite right for your input. The options are kept short and labelled in plain language.
- 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 campaign asset in seconds for a quick test using Browser Feature Detector.
- Run a one-off check during a meeting without context-switching.
- Run a fast accessibility check before publishing.
- Preview how a result looks before deploying it.
- Pull a quick reference number for a status update.
- Validate a setting before circulating it to a team.
- Sanity-check a webhook response while debugging.
- Plan content without paying for a SaaS dashboard.
FAQ
How many features?
Tests 30+ browser APIs including WebGL, Workers, WebRTC, Notifications, Geolocation, and more.
Why feature detection?
Feature detection is more reliable than User-Agent sniffing for progressive enhancement.
Performance impact?
All checks are lightweight property existence tests — no heavy API calls.
Private?
Yes — runs locally.
CSS features?
Use the CSS Support Checker for CSS-specific feature detection.
Polyfills?
The results help you decide which polyfills to include for your target audience.
Can I trust the output of Browser Feature Detector for important work?
Browser Feature Detector 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.
Is Browser Feature Detector really free?
Browser Feature Detector 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.
How do I know I am using the latest version of Browser Feature Detector?
Browser Feature Detector is updated whenever the underlying engine releases an improvement or a bug fix. Because the tool is delivered as a static page, every visit fetches the latest version automatically — there is no "version" to manage on your end. If a particular release ever changes default behaviour, the change is documented on Favtoo's changelog so you can confirm what shifted.
Can I use Browser Feature Detector on iOS or Android?
Browser Feature Detector 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.
Does Browser Feature Detector require a browser extension or plug-in?
No installation is needed. Browser Feature Detector 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 Browser Feature Detector on any computer you have temporary access to without leaving anything installed on it.
Does Browser Feature Detector ask for any browser permissions?
Browser Feature Detector 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.
How many times per day can I use Browser Feature Detector?
Inputs are capped at 0 MB per file, which keeps memory usage stable across phones, tablets and older laptops. You can run Browser Feature Detector as often as you need; every run produces a full-quality result.
Will Browser Feature Detector keep working if my Wi-Fi drops mid-task?
Once the page is loaded, Browser Feature Detector can complete jobs without an active internet connection — the engine is bundled with the page, so there is no per-job network call. The initial page load does require a connection (to fetch the static assets), but after that you can disconnect entirely and the tool will still work. This is a side-effect of the local-first architecture, not a deliberate "offline mode" feature.
Can I process multiple files at once with Browser Feature Detector?
Browser Feature Detector processes one input at a time by design — it keeps memory usage predictable on lower-end devices and makes results easier to verify. To handle a folder, run the tool once per file; the page stays loaded between runs and remembers your last-used settings, so the second run is essentially instant.