Device Pixel Ratio Checker - Online See Your DPR
Display your screen's current devicePixelRatio. See how it changes when you zoom. Useful for high‑res image decisions.
UD5 Toolkit
Display your screen's current devicePixelRatio. See how it changes when you zoom. Useful for high‑res image decisions.
See how your browser renders emojis from different Unicode versions. Detect gaps in your system's emoji font support.
See outerWidth, innerWidth, outerHeight, innerHeight, screenX/Y, and availWidth/Height live. Understand the viewport.
See a comprehensive table of which modern web APIs your current browser supports. Includes WebGPU, AVIF, and more.
Send HEAD requests to popular websites and measure the round‑trip time. Quick network health check. Client‑side.
Detect browser support for font‑tech() and font‑format() values in @font‑face src. Check COLRv1, variable, etc.
See your monitor's color depth and pixel depth. Detect if HDR or wide gamut is available using media queries.
Quickly estimate your internet connection speed by downloading a small test file. See class and recommendations.
See the current viewport width/height, document size, scrollbar width, and pixel ratio. Essential responsive data.
Drop a video file and instantly see its container format, codec(s), resolution, duration, and bitrate. Browser‑based, no upload.
Call navigator.storage.estimate() and display a visual pie chart of used vs. available browser storage. For PWA debugging.
Display your effective connection type (4g, 3g, etc.) and downlink speed using the Navigator API. Adapt your app accordingly.
See your device's battery level, charging status, and discharge time using the Battery Status API. Fun utility.
Estimate how many MB/GB your storage can hold based on navigator.storage.estimate() and display as a pie chart.
Test if your display supports HDR colors by rendering a gradient in Rec.2020 space. See what you're missing. Canvas based.
Check if your browser and display support the wider DCI‑P3 color space. See the difference with a simple test pattern.
Quickly test if your webcam, microphone, and speakers work correctly. See live video and audio meter. No data sent.
Generate a hash showing how trackers can fingerprint your browser (canvas, WebGL, fonts). Educational and privacy‑aware.
Check current browser storage usage (localStorage, IndexedDB, Cache) and available quota. Handy debugging tool.
See how many tabs you have open and estimate memory usage based on navigator object. Fun productivity check.
See exact dimensions of your current browser inner/outer window, screen resolution, and pixel ratio. Developer debug.
Find your public IP address and view approximate geolocation, ISP, and browser header details. No personal data stored. Static and instant.
Detect your current screen resolution, viewport dimensions, and device pixel ratio. Useful for responsive design testing. No data collection.
Attempt to detect your current DNS resolver IPs using DNS‑leak test queries. Educational. Privacy‑friendly.
Drop a file to see its MIME type and the first few magic bytes (hex and ASCII). No upload, works instantly.
Look at HTTP headers and JavaScript objects to guess which browser extensions might be installed. For awareness.
Display detailed information about your current browser, including version, JavaScript status, cookie support, and screen size. Works instantly with no input.
Drop a PDF and see its embedded metadata: author, title, creation date, and more. No content is uploaded; pure browser PDF parsing.
Press keys on your physical keyboard and see them highlighted on a virtual keyboard. Detects multi-key rollover. Quick hardware check.