Screen Recorder Studio
Capture full desktop monitors, application windows, or browser tabs with system audio and microphone narration. Export instantly to WebM, MP4, Animated GIF, MP3, or WAV with zero watermarks.
Configure Recording Options
Select your preferred audio sources, target frame rate, and resolution quality before launching browser capture.
You can review, configure formats, and transcode before saving.
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🔒 100% In-Browser Privacy
Every single frame and audio channel is processed locally in your web browser via the HTML5 MediaStream Recording API, Web Audio context, and client-side WASM converters. Your recordings never transit external networks or third-party servers.
⚡ Multi-Format Client-Side Transcoding
Choose between high-bitrate WebM, universal MP4 containers, looping animated GIFs for documentation and bug reporting, or isolated MP3 and lossless WAV audio tracks without installing desktop editors.
How to Record and Export Your Screen
- Configure Audio & Resolution: Select whether you wish to narrate with your microphone, include internal system/browser audio, or record silently.
- Select Target Screen or Window: Click Choose Screen and grant your browser permission to share an entire screen, application window, or Chrome/Edge/Firefox tab.
- Perform & Annotate: Conduct your software walkthrough, webinar, or bug demonstration. Use the Pause button if you need to reorganise your workspace mid-recording.
- Choose Format & Export: Click Stop Recording, pick your desired file format (WebM, MP4, GIF, MP3, or WAV), and download instantly to your device.
Technical Architecture & Media Pipeline
BWTools harnesses native browser multimedia pipelines to avoid external dependencies. Video frames are captured directly via navigator.mediaDevices.getDisplayMedia. Audio narration and system playback are routed through a real-time AudioContext and dynamically merged with a MediaStreamAudioDestinationNode.
When exporting as an Animated GIF, video keyframes are rasterised across an in-memory HTML5 Canvas and compiled via an optimised Octree colour quantiser. Audio extractions sample 32-bit floating point PCM streams and convert them to uncompressed 16-bit RIFF WAV or MPEG-1 Layer III MP3 via client-side LAME transcoding.
Export & Capability Specifications
| Format | Encoding Type | Transcoding Speed | Recommended Use Case |
|---|---|---|---|
| WebM (.webm) | VP9 / VP8 + Opus | Instant (Zero wait) | High-framerate software walkthroughs, YouTube, Discord |
| MP4 (.mp4) | H.264 / AVC + AAC | Instant | Universal presentation playback, Keynote, PowerPoint, QuickTime |
| GIF (.gif) | Animated Graphics | Frame rasterisation | GitHub pull requests, bug reproduction, documentation wikis |
| MP3 (.mp3) | LAME Audio Layer III | Fast client PCM | Podcast recording, voice memo extraction, audio-only lectures |
| WAV (.wav) | 16-bit Linear PCM | Instant lossless | Studio audio mastering, sound design, transcription pipelines |
Frequently Asked Questions
How does client-side MP4 and GIF conversion work?
When MP4 is chosen in supported browsers, MediaRecorder records directly to an MP4 container. When converting to GIF, our in-browser engine samples frames from the recorded video element at specified intervals and builds an animated GIF file directly inside JavaScript memory.
Can I extract just the audio track from a long recording?
Yes. Select MP3 or Lossless WAV in the format dropdown. The audio channels are decoded from the recorded bitstream and exported as a standalone audio file, ideal for podcasting or transcription.
Is there any limit on how long I can record?
There are zero software restrictions or watermarks. Because recorded chunks accumulate in browser memory, you can record continuously for hours as long as your device has sufficient RAM available.