Credit where it is due
SoundTools is the cleanest free spectrum visualizer on the web. Open the page, drop a track, pick one of 14 styles, press Export Video, and a 1080p file with the audio baked in lands in your downloads. No account, no watermark, no limit. On the best-free-visualizer page on this site it ranks second, and it earns that.
If a bar chart or a glowing blob over your cover art is the video you want, use it and skip the rest of this page.
Where 14 styles stop
Fourteen styles is a menu, and menus repeat. The circular spectrum, the mirrored bars and the Lava Lamp scene look the same on your channel as on the next one, because the audio only changes a height or a glow. After a few uploads the look is recognisable, and viewers file it under “visualizer” and scroll on.
Groovalizer draws from 3,500+ presets written in the MilkDrop format and rendered by projectM, the open-source successor to Winamp’s visualizer. A preset is a scene in equations: the bass folds the geometry, the treble changes the colour drift, and a feedback loop turns last frame into this one. Two songs through the same preset make two different videos.
Here is the trade. SoundTools gives you a clean video with no strings. Groovalizer gives you a scene, and asks $14.99 a month to export it, after a 7-day free trial.
Groovalizer vs SoundTools at a glance
| Groovalizer | SoundTools |
|---|
| Price | Free to watch · Pro $14.99/mo, 7-day trial | Free, no account |
| Watermark | None on Pro (free does not export) | None |
| Styles | 3,500+ generative presets | 14 styles (5 on Safari and Android) |
| Max export | Up to 4K (Pro) · none (free) | 1080p60 desktop · 720p30 mobile |
| Formats | MP4 · WebM in Firefox | WebM or MP4 on desktop; screen recording on iPhone |
| Aspect ratios | 16:9 · 9:16 · 1:1 | Export for YouTube or TikTok |
| Per-section looks | Timeline assigns presets to song sections | One style per video |
| Live / projector mode | Yes, mic-reactive fullscreen | No |
| Rendering | Your browser | Your browser |
SoundTools facts from soundtools.io/music-visualizer, September 2026. Groovalizer limits come from the plan table the app enforces.
Three things a spectrum tool cannot do
Change per section. Groovalizer’s timeline assigns one preset to the intro, another to the drop and a third to the outro, with a soft cut between them. Play live. Live mode takes the microphone and fills a projector at 60 frames per second, cycling presets on a timer, with no account. Be edited. Every preset is a text file you can open in the built-in editor, change while it runs, and save as your own.
SoundTools does one thing well and stops. That is a virtue until you need the second thing.
Which one to open
Open SoundTools for a quick, clean, spectrum-style upload with a zero budget, or when you are on a phone and need a file today. Open Groovalizer when the visuals are part of the music, when the video has to change with the song, or when you want to run it on a wall at a show.
Both keep your audio on your machine. Preview Groovalizer with your own track first; it costs nothing and needs no account.