What this tool does
Audio Waveform is a fully local audio waveform visualizer tool. Once you drop in a file, every computation happens on your own device — nothing is uploaded to any server, so there is no bandwidth cost and no privacy risk.
It is built on the browser’s native Web Audio and Canvas APIs, so it needs no cloud service and no large transcoding engine to download. For common audio and video formats the job usually finishes within seconds.
Whether you want to feed material into an editor, prepare clips for a podcast, or just need a more universal format, Audio Waveform gets it done without leaving the page.
How to use
- Pick and drop a file Accepts common formats such as .mp3, .m4a, .aac, .ogg, .flac, .wav, .webm, up to 200MB each. Files are processed one by one or concatenated in order, depending on the tool.
- Adjust the options Set the output format, sample rate, start/end time, quality and so on. Each option carries an inline explanation you can hover over.
- Wait and download When done you will see a before/after size comparison and the saving ratio; click download to save it locally. Everything stays on device and is cleared when you leave.
FAQ
Is my file uploaded?
No. Decoding, transforming and encoding all happen inside your browser; the file stays on your device and is released when you close the page.
Which formats are supported?
Inputs include .mp3, .m4a, .aac, .ogg, .flac, .wav, .webm and similar common formats; the exact set depends on your device and browser codecs. If a file cannot be decoded you get a clear message instead of a silently empty output.
Why can it be slow sometimes?
Decoding and recording rely on native browser abilities, so speed depends on clip length and device performance. Re-recording a video runs in real time, so longer clips need patience.
Why is the output large?
Lossless formats such as WAV are not compressed: 16-bit/44.1kHz stereo is about 10MB per minute. If size matters, pick a lower sample rate or a lossy format in the options.
Does it work on phones?
Modern mobile browsers generally support the required Web Audio and Canvas features. A few minimal systems may lack certain codecs and will tell you clearly; try another file or browser.
Limits
Up to 200MB per file; very long clips are bounded by device memory and may need to be split.
Decoding relies on platform codecs: a few minimal systems may lack certain audio or video encodings and will tell you clearly instead of producing an empty file.
Everything runs locally — there is no cloud acceleration, batch queue or server transcoding; for those, use dedicated desktop software.