generate audio waveform online
A waveform is a visual summary of amplitude over time: it speeds up finding silence at the start, locating choruses and trimming speech blocks without listening to the whole file. This tool draws 3 styles (bars, line and mirror) from the same audio and exports both as a fixed-pixel PNG and as vector SVG, resizable with no loss.
The extra image width is intentional: the layout centres the bars instead of stretching them to the edges.
In portrait format the mirror style reads better than thin bars, because the filled shape visually occupies more vertical space.
In bar style that same section would still show tiny 2px-minimum bars, the line style makes the silent start more visually obvious.
Bars: symmetric columns where height represents amplitude, the most recognizable style used in audio players. Line: continuous trace connecting peaks, a smoother, more organic look. Mirror: the waveform is reflected above and below the center axis, a symmetric visual effect popular in podcast and video visualizations.
Bars draws 200 discrete rectangles, a classic histogram look. Line traces two separate curves (max on top, min on the bottom), leaving the centre hollow. Mirror uses the same max/min envelope but closes the path and fills it as one solid shape, the look most common in music players.
PNG is a fixed pixel snapshot, at the exact size of the chosen preset (1280x720, for example). SVG describes the same waveform as a vector: it fits any page width without pixelating and can change colour just by editing a `fill` attribute in CSS, useful for reusing the same shape in a site's light and dark theme.
The default is 200 points, adjustable in the interface. Each point summarizes a block of the original audio's samples into three numbers (min, max, RMS), so more points bring more temporal detail, and in bar style it also makes each individual bar thinner, since the width always adjusts to fit the canvas.
The audio is decoded and drawn locally in your browser. No file is uploaded to any server.