Free Online Audio Tools
Three focused tools built on the Web Audio API, which means the recording, the trim, and the speed change all happen on your device. Record a voice memo straight from your microphone and download it without an app or a signup. Cut an interview down to the thirty seconds you actually need by dragging on the waveform or typing exact timestamps. Slow a lecture to 0.75× to transcribe it, or speed a podcast to 1.5×, with pitch correction so voices do not turn into chipmunks. Files stay in the tab throughout — useful when the recording is a client call or a medical note you would not upload to a random converter.
All 3 Audio Tools
Voice Recorder
Record your voice via browser mic with live waveform. Save as MP3 or WAV. No app, no upload.
Audio Trimmer
Trim MP3, WAV, OGG, FLAC with a visual waveform editor. Precise selection, browser-only.
Audio Speed Changer
Speed up or slow audio from 0.25x to 4x with optional pitch preservation. Browser-only, no upload.
Why use these audio tools
Recording never uploads
Microphone audio is captured with MediaRecorder and held in memory until you download it. Nothing is streamed to a server, so a private conversation stays on your device.
Frame-accurate trimming
Set cut points by dragging the waveform or typing exact timestamps down to the millisecond, then export only the selected region without re-encoding the rest.
Speed change with pitch preserved
Playback rate is adjusted with pitch correction, so a lecture at 0.75× or a podcast at 1.5× still sounds like the original speaker rather than a chipmunk.
Frequently asked questions
Is my recording sent anywhere?
No. The browser’s MediaRecorder writes audio into memory in the page, and the download is generated from that buffer. There is no upload endpoint. You will be asked for microphone permission because the browser requires it for any recording, but the audio itself stays local.
Which audio formats can I open?
Anything your browser can decode, which in practice means MP3, WAV, OGG, M4A, and WebM. Recordings are produced as WebM or WAV depending on what your browser supports. If a file will play in your browser, these tools can work with it.
Does changing the speed ruin the audio quality?
No. Pitch correction keeps voices sounding natural between roughly 0.5× and 2×. Beyond that range artefacts start to appear, which is a limitation of time-stretching in general rather than of this tool specifically.