Local Media Lab / record and edit
Your microphone is not our media server.
Record after an explicit permission prompt or import a local audio file, then trim, fade, adjust gain, preview, and export 16-bit PCM WAV entirely on your device.
Permission is requested only when Start recording is pressed. Maximum 10 minutes.
No audio loaded.
Click near either trim boundary to move it. The shaded regions will be removed.
What happens to a recording
The browser asks for microphone permission only after you press Start. MediaRecorder creates a temporary in-memory Blob, Web Audio decodes it locally, and all stream tracks are stopped. Vader does not receive the recording. Clearing or reloading releases the working copy; saving to the local workspace is a separate, explicit IndexedDB action.
A basic, non-destructive edit
Trim, gain, and fades remain parameters until export. The source buffer is not modified. WAV export writes uncompressed 16-bit PCM, so it can be much larger than an imported MP3, AAC, Opus, or other compressed file.
Browser limitations
Import and recording formats vary by browser and operating system. This tool does not claim universal codec support, noise restoration, source separation, mastering, or lossless round-tripping from a lossy source.