Browser Screen Recorder - Online Record Tab & Download WebM
Record your screen, window, or tab with audio directly in the browser. Download the recording as a WebM file. No upload.
UD5 Toolkit
Record your screen, tab, or window instantly — no install, no watermark. Download as WebM.
getDisplayMedia) built into modern browsers to capture your screen, application window, or browser tab. The captured video stream is then recorded using the MediaRecorder API and saved as a WebM file — all processed locally on your device. No data is ever uploaded to any server.
screen-recording-2024-01-15-143022.webm). You can then share it via email, upload to cloud storage, post on social media, or edit it in video software. WebM files play natively in browsers and are compatible with VLC, YouTube, and most modern video tools.
Record your screen, window, or tab with audio directly in the browser. Download the recording as a WebM file. No upload.
See a comprehensive table of which modern web APIs your current browser supports. Includes WebGPU, AVIF, and more.
Tune your guitar using the browser microphone. Detects pitch and shows deviation from standard tuning. No installation, pure client-side audio processing.
Select any HTML element on a page and capture its screenshot. Download as PNG. Perfect for bug reports. JavaScript API demo.
Test your browser's built‑in speech recognition. Speak and see the transcribed text appear live. Must‑have for voice app devs.
Paste a user agent string to get a human-readable breakdown of browser, operating system, and device. See your own current agent info automatically.
Track attendance for multiple subjects. Mark present/absent and see percentage. Data in localStorage. Simple student tool.
Paste your speech, set time limit, and practice with a pacing indicator (words per minute). Refine delivery.
Request a USB device and communicate with it using the Web USB API. See vendor and product IDs. Experimental.
Drag a virtual ruler across your screen to measure pixel distances. Horizontal and vertical guides. Useful for UI designers checking alignment.
Visualize audio in real time from your microphone or uploaded audio file. See the waveform dance. Uses Web Audio API locally.
Simple tracker to record potty attempts, successes, accidents. See patterns. Data stays local. Aids in toilet training journey.
Paste HTML and see a before/after comparison of minified output. Check the byte savings. All local.
A precise online metronome with adjustable BPM, beat emphasis, and time signature. Works offline. Essential for musicians.
Play an audio file or use mic to see real‑time frequency bars. Choose colors. Great for music videos. Canvas.
Enter two dates and see the exact number of days, weeks, and workdays between them. Also shows the countdown or days since.
Turn your browser screen into a full‑color flashlight or strobe. Adjust brightness and color. Simple utility.
Compare :focus and :focus‑visible styling. See which one applies when using mouse vs. keyboard. Accessible focus management.
Enter a URL and generate a responsive iframe embed code with correct aspect ratio. Supports YouTube, maps, and more.
Convert pixel values to em and rem units based on a base font size. Bidirectional. Must‑have for front‑end developers.
Create a reflection effect for images or text using box‑reflect. Adjust direction and offset. Copy the CSS.
Click any element on a demo page and see which events are attached. Visual debugger for event handling.
Play left‑only, right‑only, and frequency sweeps to test your speakers or headphones. Quick audio check.
Build a properly formatted robots.txt file with user-agent rules and sitemap location. Validate syntax in real time. Essential for webmasters.
See your website inside iframes at multiple breakpoints simultaneously. Side‑by‑side responsive testing.
Convert REM values to pixels and vice versa based on your root font size. Essential for scalable web typography.
Paste a robots.txt file and validate its syntax. See if a specific user‑agent can access a path. Essential for webmasters.
Paste robots.txt content and parse it to check validity, find disallowed paths. Educational SEO tool. Local processing.
Set a list of agenda items with allocated minutes. Advance through speakers and see remaining time visually. Keep meetings on track.
Register a service worker, subscribe to push, and send a test notification using a VAPID key pair. Step‑by‑step demo.