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ブラウザ内で MP3、WAV、FLAC、OGG などを処理。

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Why browser-only audio tools?

Most online audio tools upload your file to a remote server, process it there, and return a download link. That means your audio — whether it is a private voice note, an unreleased track, or a confidential recording — is sent to and stored by a third party. The tools on this page use the Web Audio API to decode and process audio entirely in your browser. Nothing is transmitted over the network.

Browser-based audio processing is also faster than round-trip uploads for small to medium files, and works offline once the page has loaded. The Web Audio API can decode MP3, WAV, OGG, FLAC, and M4A (browser support varies), making it suitable for most everyday audio tasks without requiring specialised software.

Choosing the right tool

For cutting unwanted silence at the start or end of a recording, use the Audio Trimmer. To even out the volume across multiple clips, use the Volume Normalizer. To change the speed of a track, use the Tempo Changer. To transpose a recording up or down, use the Pitch Shifter. For assembling multiple clips into one file, use the Audio Merger. If you need to record directly from your microphone, the Voice Recorder handles capture and download.

よくある質問

Are my audio files uploaded to a server?
No. Every audio tool on this page runs entirely inside your browser using the Web Audio API and JavaScript. Your files never leave your device — not even temporarily.
Which audio formats are supported for input?
The browser can decode most common formats: MP3, WAV, OGG, FLAC, AAC/M4A, and WebM. Exact support depends on your browser. Chrome and Edge cover the widest range; Safari handles MP3, WAV, AAC, and FLAC natively.
What format is the output?
Most tools export WAV (PCM 16-bit), which is universally compatible. The Audio Converter also offers OGG (Opus) output on browsers that support the MediaRecorder API with OGG. The Voice Recorder saves as WebM.
Do these tools work on iPhone and Android?
Yes. All tools are mobile-first and work in Safari on iOS and Chrome on Android. The Voice Recorder requires microphone permission, which browsers will ask for the first time.
Can I process large audio files?
The entire file is decoded into memory as an AudioBuffer, so very large files (over a few hundred MB) may be slow or hit memory limits on low-RAM devices. For typical recordings and music tracks this is not an issue.
Is the Tone Generator useful for anything real?
Yes. Common uses include testing speaker frequency response, creating notification sounds, generating DTMF tones, calibrating audio equipment, and producing simple ringtones or alert sounds for apps.
How does the silence-based splitter work?
The Audio Splitter scans the waveform for stretches of audio that fall below a configurable amplitude threshold for at least a minimum duration. It then cuts at the midpoint of each silent gap, producing separate WAV files for each segment.
Do the tools work offline?
Yes. All tools are static pages with no external API calls. Once the page has loaded in your browser, they work without a network connection.
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