Screen Recorder

Record your screen, window, or browser tab directly in your browser with optional microphone audio. Download as WebM — no installation, no uploads, no time limits.

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How to Use

Record your screen directly in the browser with no software to install. The entire recording process runs locally using the Screen Capture API and MediaRecorder API — your video never leaves your device.

Configure audio (optional): Toggle "System audio" to capture tab or application sounds. Toggle "Microphone" to record voice narration. Both can be enabled simultaneously — the tool mixes audio tracks automatically using the Web Audio API.
Click "Start Recording": Your browser opens a sharing dialog where you select what to capture — an entire screen, a specific application window, or a single browser tab. Chrome users selecting a browser tab can also tick "Share tab audio" in the dialog.
Record your content: A live preview shows what is being captured. The elapsed timer counts up in real time. Use the Pause button to temporarily halt recording and Resume to continue — the final file is seamless.
Stop and review: Click "Stop Recording" or end the share from the browser toolbar. The tool assembles all captured chunks into a single WebM file. A video player appears so you can review the recording immediately.
Download: Click "Download WebM" to save the file. The filename includes a timestamp for easy organization. File size and duration are displayed for reference.

About This Tool

How Browser-Based Screen Recording Works

This tool uses three native browser APIs. The Screen Capture API (getDisplayMedia()) grants access to screen, window, or tab video streams after explicit user consent. The MediaRecorder API encodes the stream in real time using the VP9 video codec and Opus audio codec inside a WebM container. When both system audio and microphone are active, the Web Audio API mixes the tracks into a single audio output via AudioContext and MediaStreamAudioDestinationNode.

Video data is collected as Blob chunks every second via the ondataavailable event. When recording stops, the chunks are assembled into a single Blob in memory and offered for download. No intermediate files are written to disk, and no data is transmitted to any server. The VP9 codec typically produces files 30-50% smaller than VP8 at equivalent quality, and Opus provides excellent audio quality at low bitrates.

WebM Format and Compatibility

WebM is an open, royalty-free media container format based on Matroska. It is natively supported by Chrome, Firefox, Edge, Opera, and VLC media player. macOS users can play WebM files in IINA or VLC. For platforms requiring MP4, tools like FFmpeg can remux WebM to MP4 without re-encoding: ffmpeg -i recording.webm -c copy output.mp4. The VP9+Opus codec combination preserves full quality during container conversion since no transcoding is needed.

Browser Compatibility

Screen capture via getDisplayMedia() is supported in Chrome 72+, Firefox 66+, Edge 79+, and Safari 13+. System audio capture is most reliable in Chromium-based browsers when sharing a browser tab. Safari supports screen capture but does not expose system audio tracks. The MediaRecorder API with WebM output is supported in all major desktop browsers except Safari, which uses MP4 natively — this tool detects the best available codec automatically.

Why Use This Tool

No Software Installation Required

Traditional screen recorders like OBS Studio, Camtasia, or Loom require downloading and installing software. This tool runs entirely in your browser tab — open the page, click record, and you are capturing. It is ideal for quick recordings when you do not want to install an application, when you are on a managed device with restricted software installation, or when you need to capture something immediately without setup.

Common Use Cases

Bug reports: Record a UI bug in action to attach to a Jira or GitHub issue. A screen recording communicates the problem more clearly than a screenshot or written description.
Tutorials and walkthroughs: Record step-by-step instructions for software usage, onboarding flows, or configuration procedures. Add microphone narration for voice-over explanations.
Presentations: Capture a slide deck with voiceover narration for async distribution. Share the WebM file or convert to MP4 for uploading to video platforms.
Design reviews: Record yourself navigating a prototype or staging site while providing verbal feedback. Designers can replay the review at their convenience.
Support documentation: Create short video guides for frequently asked support questions. A 30-second screen recording often resolves issues faster than a written knowledge base article.

Complete Privacy

Every byte of your recording stays on your device. There is no account creation, no cloud upload, no analytics on your content, and no file size restrictions imposed by a server. The recording exists only in browser memory until you download it. This makes the tool suitable for recording sensitive content such as internal dashboards, medical records, financial data, or confidential presentations.

FAQ

What video format does the recording use?

Recordings are saved as WebM with VP9 video codec and Opus audio codec. WebM is an open format supported by Chrome, Firefox, Edge, and VLC. For sharing on platforms that require MP4, use any free video converter — the WebM container preserves full quality for conversion.

Can I record system audio along with my microphone?

Yes, if your browser supports it. Chrome allows capturing system audio when recording a browser tab (select 'Share tab audio' in the dialog). For window or screen captures, system audio availability depends on your operating system. Microphone audio can always be added regardless of the capture source.

Is there a time limit on recordings?

No artificial time limit. Recording length is limited only by your available browser memory. A 10-minute 1080p recording typically uses 50-150 MB of memory depending on content complexity. For very long recordings (over 30 minutes), ensure you have sufficient free RAM.

Is my recording uploaded anywhere?

No. The entire recording process happens locally in your browser using the MediaRecorder API. Video data is stored in browser memory as Blob chunks and assembled into a file when you stop recording. Nothing is transmitted to any server.

Why does the browser ask for permission?

Screen capture requires explicit user consent via the browser's built-in sharing dialog. This is a security feature of the Screen Capture API — no website can record your screen without your active permission. You choose exactly which screen, window, or tab to share.