Generate static waveform images from audio files for social media and embeds.
Upload an audio file and this tool turns its amplitude over time into a single flat image - a row of bars or a continuous line - sized for a social post, podcast thumbnail, or webpage in place of a live player. It decodes the file, reduces the sample data down to one value per pixel column, and renders that to a canvas you can export. The part people don't expect: the vertical scale is set by the single loudest peak in the file, so one loud spike can make everything else look flatter than it sounds, and a heavily compressed, uniformly loud track can render as almost a solid block.
Decoded audio is a long list of amplitude samples - thousands per second. To fit a waveform into a few hundred or a few thousand horizontal pixels, the tool groups samples into short time slices, one per pixel column, and keeps a representative value (commonly the peak or an RMS-style average) for each slice. That reduction is what turns a multi-megabyte sample buffer into a manageable row of bar heights.
The per-column values are drawn to a canvas as bars, a filled line, or a mirrored top/bottom shape, using whatever stroke color, background, and pixel dimensions are set. The output is exported as a static image file rather than anything tied to playback, so there is no cursor, timestamp, or audio embedded in the result - just a picture of the whole file's shape.
No - this generates a single static image file. If you need a waveform that moves with playback, such as for a video export or an audio-reactive animation, you need a different tool; this one only produces a fixed picture of the whole file's shape.
No - the file is decoded and drawn in your browser and never leaves your device. That also means a very long file or an unsupported codec is limited by what your browser itself can decode, not by any server-side conversion step.
The behavioral notes were checked against the browser implementation. Standards and primary references below define the relevant format, formula, or platform behavior.
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