Turn a song, podcast clip or voice note into a shareable video: your cover image and title with animated bars, a waveform or a circular spectrum that moves with the sound. Choose a square, vertical or widescreen size and record the video in your browser, without uploading anything.
Last updated:
Recording…
Visualizer
Advertisement
Advertisement
How to use the Audio Visualizer Video Maker
Add your audio: drop an MP3, WAV, M4A or other audio file. A demo track is loaded so you can see the preview right away.
Add a cover image (optional) and type a title and subtitle, for example the episode name and the show.
Pick the size and style: square, 4:5, vertical 9:16 or 16:9, and bars, mirror, wave or circle. Adjust colors, bars and sensitivity while the preview plays.
Choose the clip: set the start time and length. Audiograms of 30–60 seconds work best on social media.
Create the video: press Create video and keep the tab open while it records in real time, then download the MP4 or WebM file.
Audiogram sizes for each platform
Where you post
Size
Aspect ratio
Good clip length
Instagram and Facebook feed
1080 × 1080 or 1080 × 1350
1:1 or 4:5
15–60 s
Instagram Reels and Stories, TikTok, YouTube Shorts
1080 × 1920
9:16
15–60 s
YouTube video, website, presentation
1920 × 1080 or 1280 × 720
16:9
Any length
LinkedIn and X (Twitter) feed
1080 × 1080 or 1920 × 1080
1:1 or 16:9
30–90 s
In the 9:16 size, keep the important parts away from the very top and bottom: the apps place the caption, profile name and buttons there. The layout of this tool leaves those margins free.
What the visualizer shows
The Bars, Mirror and Circle styles are a spectrum analyser. For every video frame the tool takes 2,048 audio samples (about 46 ms at 44.1 kHz) centred on the current playback time, applies a Hann window and computes a fast Fourier transform. The result is split into as many bands as there are bars, spaced logarithmically from 50 Hz to 16 kHz, the way we hear pitch: each octave gets the same number of bars. The loudness of each band is converted to decibels, given a gentle +4.5 dB per octave tilt so high frequencies are visible too, and mapped to the bar height. Bars jump up instantly and fall back smoothly, which keeps the motion readable.
The Wave style is an oscilloscope: it draws the raw waveform of the 45 ms around the playhead, so you see the shape of the sound itself, tapered at both ends.
Tips for audiograms that get watched
Pick the most surprising or useful 30–60 seconds of an episode, starting right on a strong sentence rather than with an introduction.
Use a square cover image of at least 1080 × 1080 pixels; it is cropped to a square from the centre.
Most people scroll with the sound off, so put the hook into the title, for example the question the clip answers.
High contrast between the background and the bars looks best on small phone screens. The Neon and Sunset presets are designed for that.
Record with the tab visible and other heavy apps closed: the video is captured in real time, and a busy computer can drop frames.
Frequently asked questions
What is an audiogram?
An audiogram is a short video made from audio: a still image, usually the podcast cover or album art, with an animated waveform or bars and often a title or captions. Because social networks do not accept plain audio posts, audiograms are the usual way to share podcast clips and music snippets.
Why does creating the video take as long as the clip?
The video is recorded in real time while the audio plays, the same way a screen recorder works, so the animation and sound stay perfectly in sync. A 30 second clip takes about 30 seconds. Keep the tab visible while it records, because browsers slow down animations in hidden tabs.
Will I get an MP4 or a WebM file?
Chrome and Edge (version 126 and newer) and Safari can record MP4 with H.264 video and AAC audio. Firefox and older browsers record WebM. Instagram, TikTok and Facebook accept MP4; if you get a WebM file and need MP4, convert it with a video converter.
Is my audio uploaded?
No. The audio is decoded and analysed by your browser, the frames are drawn on a canvas and the video is recorded by the browser's built-in MediaRecorder. Nothing is sent to a server.
Which size should I choose?
1080 × 1080 (1:1) or 1080 × 1350 (4:5) for Instagram and Facebook feed posts, 1080 × 1920 (9:16) for Stories, Reels, TikTok and YouTube Shorts, and 1920 × 1080 (16:9) for YouTube and websites. Use 1280 × 720 for smaller files.
How do the bars follow the music?
About 30 times a second the tool takes the audio around the current playback position, runs a fast Fourier transform (FFT) on it and measures the energy in frequency bands spaced logarithmically from about 50 Hz to 16 kHz. Low bands on the left are bass and kick drum, higher bands are vocals, cymbals and detail.
Can I make a video longer than a few minutes?
Yes, up to 10 minutes per video, but long recordings create large files and the tab must stay open the whole time. For podcasts, shorter highlight clips get much more engagement.
Are all the tools on FreeToolCabin tested for quality and accuracy?
Yes! Every tool on our site undergoes automated Q/A testing in real browser environments to ensure high precision, correct output, and zero errors. If you happen to spot a bug or have a suggestion, please contact us at [email protected] and our team will review it right away.