Free is enough for most one-off jobs. Pro raises the file and batch caps; Pro + Media unlocks GB-scale streaming and unlimited duration.
Larger files supported on Developer (5 GB CSV) and Enterprise (unlimited). All processing happens in your browser — files never reach a server.
Drop your audio file
Pick FFT size and window
Download the spectrogram PNG or copy frequency data as JSON
0 bytes uploaded. Spectrum Analyzer runs entirely in your browser using FFmpeg.wasm 8.1, RNNoise, and the Web Audio API. Your audio stays on your device at all times. No data is sent to any server — critical for sensitive interviews and confidential calls.
2048 is the default sweet spot. 4096-8192 for detailed harmonic analysis. 512-1024 for transient/percussive material.
Detect the tempo of any song using local energy-based onset detection and autocorrelation. Pure browser CPU, no upload, no account.
Open toolRender a waveform image at any size and color. Perfect for podcast cover art, social posts, or audiograms.
Open toolOne-click voice EQ chain: high-pass at 80 Hz, gentle low-mid cut, presence boost at 3 kHz. Built for podcast and voiceover production.
Open tool