Free Online Spectrogram Generator
See the frequencies of a track as an image.
What is this tool
AudioToolKit generates a spectrogram image from any audio file online for free, in your browser. The PNG visualizes frequency content over time — time across, frequency up, brightness for energy — making clicks, hum and pitch jumps visible at a glance. The 1600 x 500 image is rendered locally and downloaded directly, so the audio file never leaves your device.
Drag and drop your file here
or
MP3, WAV, M4A, AAC, OGG, FLAC, AIFF, AIF, OPUS, WMA, AMR — up to 25 MB per file
Output
PNG image
Accepted formats
.mp3, .wav, .m4a, .aac, .ogg, .flac, .aiff, .aif, .opus, .wma, .amr
Why use this free tool
A spectrogram turns a recording into a picture: time across, frequency up, brightness for energy. It makes clicks, hum and pitch jumps visible at a glance — useful for analysis, memes and mix reviews.
How does the free spectrogram work?
- 1
Upload the track.
- 2
Press Generate.
- 3
Download the PNG spectrogram.
Frequently asked questions
What am I looking at?
Each column is a moment in time; brighter bands are stronger frequencies. Horizontal lines are steady tones, diagonals are pitch bends.
Is the file uploaded?
No — the image is rendered in your browser.
What resolution is the image?
1600 x 500 PNG, enough for sharing and printing.
Related tools
More answers in the Help Center.