Screen Recorder with Audio That Actually Sounds Good

Screen recorders sit on top of the browser's MediaRecorder API, which by default re-encodes captured audio in real time using lossy codecs like Opus or AAC at conservative bitrates. The encoder runs on the same thread as everything else, so it's tuned for speed and small files — not fidelity. The first thing you lose is everything above ~16 kHz, then the high-frequency detail in cymbals, breath sounds, and consonants. Music turns mushy, voices get a slight muffled quality that nobody can put a name on.

The fix isn't a different recorder — it's a different audio path. RecATab taps the audio stream before the lossy encoder ever sees it, captures it as raw 32-bit floating-point PCM via an AudioWorklet, and only encodes once at the very end when FFmpeg WASM muxes it into the final MP4 container.

Inside the browser, an AudioWorklet sits in front of the audio graph and pulls raw samples at the device's native rate (typically 48 kHz, stereo). Those samples are written straight to OPFS (the browser's native filesystem) as the recording happens, so memory stays flat even on long sessions.

When you stop recording, FFmpeg WASM mixes any optional microphone input with the tab audio, encodes once into the final container, and copies the video track without re-encoding. The result is a standard MP4 that plays in any player, with audio that's functionally indistinguishable from the original tab.

• True lossless PCM capture — no Opus, AAC, or sample-rate downmixing during recording
• Optional microphone input mixed in at the same fidelity
• Output: standard MP4 (H.264 + AAC) — universal compatibility
• Up to 30 minutes per recording, 100% free, no account required
• Everything runs in your browser — recordings never leave your device unless you choose to share