Audio Visualization Maker
Analyze your track with STFT frequency mapping, preview four WebGL spectrum styles in real time, then export a 30 fps H.264 MP4 with synced audio. No upload required.
If you have a beat preview, podcast clip, voice note, DJ drop, or unreleased track, a reactive spectrum video gives you something watchable without filming new footage. Instead of posting a static cover image, you can make bass, mids, and treble move on screen so your audio feels alive before your audience presses play.
This is especially useful when you want a fast social post but do not want to open After Effects, install a desktop plugin, or upload your raw audio to another service. GrepCut keeps the work in your browser: decode, analysis, preview, render, and download.
You can choose from four visual styles: Radial Bars, Spectrum Bars, Orbital, and Classic Bars. Three styles render with WebGL2 bloom for a glowing spectrum look, while Classic Bars uses a more traditional Canvas2D equalizer layout with waveform detail.
You can also switch the canvas shape before rendering. Use 9:16 vertical for Reels, TikTok, and YouTube Shorts, 16:9 landscape for YouTube or widescreen posts, and 1:1 square when you want a centered feed video.
GrepCut analyzes your audio with a radix-2 FFT using a 2048-point window, then maps the energy into 64 frequency bins. That gives the visualizer a compact timeline of bass, midrange, and treble movement that can be reused for live preview and export.
Attack and release envelopes smooth the motion differently for each style. Bars can react quickly to drums and consonants, while ring-based styles can feel softer and more cinematic instead of jittery.
Export is frame-by-frame at 30 fps. GrepCut draws each frame to an offscreen canvas, encodes H.264 video with AAC audio through WebCodecs and Mediabunny, then gives you an MP4 without sending your file to a server.
Can you make an audio visualizer video for free?
Yes. You can make a spectrum visualization MP4 in GrepCut without an account and without a watermark. Your audio is decoded, analyzed, previewed, rendered, and exported locally in your browser.
Will your audio be uploaded to a server?
No. GrepCut runs the decoding, STFT analysis, WebGL rendering, and MP4 encoding in your browser. Your file stays on your device.
What audio formats can you use?
You can try common browser-decodable formats: **MP3**, **WAV**, **M4A**, **OGG**, and **FLAC**. If your browser cannot decode a file, export it as MP3 or WAV first and try again.
Which visualizer style should you choose for music?
Choose **Radial Bars** for a classic circular equalizer, **Orbital** for a smoother cinematic ring, or **Classic Bars** for beat-heavy tracks with a retro feel. **Spectrum Bars** is cleaner when you want the audio to support a podcast or voice clip instead of dominating the frame.
Which aspect ratio should you use for TikTok, Reels, or Shorts?
Use **9:16 vertical** for TikTok, Instagram Reels, and YouTube Shorts. Use **16:9** for landscape YouTube uploads and **1:1** when you want a square feed post.
What video file does GrepCut export?
GrepCut exports a **30 fps H.264 MP4** with **AAC audio**. That combination is practical for Instagram, TikTok, YouTube, and most video editors.
Why can a long track take time to render?
Export is frame-by-frame. At 30 fps, a three-minute song is about 5,400 frames, and each frame has to be drawn and encoded. Preview feels faster because GrepCut reuses the precomputed frequency timeline while your audio plays.
Can you add lyrics, captions, or a logo in this tool?
Not inside Audio Visualization Maker. This tool focuses on spectrum motion, aspect ratio, accent color, and MP4 export. After download, open the result in [GrepCut Studio](/) if you want captions, text, trimming, or a bigger timeline edit.