Render local audio as an amplitude envelope with per-pixel extrema and time ticks, downloadable as SVG and PNG.
Your input
Outputs are cleared when the input changes.
Result
Enter your data or use the example, then run the tool.
Worked example
The generated sample has a short pulse around 0.5 seconds. Its peak remains visible even when many audio frames share one output-pixel bucket. Duration ticks use decoded seconds.
Method
Decode to PCM and group frames by output x pixel. Keep min/max across every channel in each bucket, draw a vertical envelope, zero line and start/middle/end seconds. Reserve 24 pixels for the time axis. Export equivalent local Canvas PNG and escaped SVG with a localized title.
Limits
One file up to 50 MiB; decoded mono/stereo up to five minutes and 28.8 million samples across channels. Only browser-decodable formats. Decoding may resample; output PCM16 WAV is quantized, not a lossless copy of the compressed stream. Native decode cannot be forcibly interrupted; cancellation ends the wait and cleans resources when possible. Image 64–4096 by 64–2048 pixels. Samples beyond -1 to 1 are clipped only in the displayed range and reported. Not a spectrum, beat detector, speech recognizer or recoverable audio encoding.
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