How to view spectrogram without uploading — free browser tool
- Step 1Upload your audio file — Drop your audio.
- Step 2Run spectrum analysis — Configure FFT settings.
- Step 3View and export the frequency spectrum — View the spectrogram — your file never left the tab.
Frequently asked questions
What does the spectrum analyser tell me about my audio?+
The spectrum shows which frequencies are loudest (peaks) and which are quietest (dips) in your audio. A balanced recording has energy distributed across the relevant frequency range for the content. Common problems visible in spectrum analysis: too much energy at 300–500 Hz (muddy/boxy), too little energy above 8 kHz (dull), excessive energy at 6–10 kHz (harsh sibilance).
How do I use spectrum analysis to improve my podcast sound?+
Look for large peaks above the noise floor in the 300–600 Hz range (box/mud) and consider a narrow cut EQ there. Check the 2–5 kHz range is present and forward (presence and intelligibility). If energy drops sharply above 8 kHz, your microphone or recording chain is lacking air — a gentle high-shelf boost at 10–12 kHz may help.
What is the difference between an FFT analyser and a spectrum analyser?+
A spectrum analyser visualises frequency content over time (a running average or short-time FFT). An FFT (Fast Fourier Transform) analyser typically shows a single snapshot at a chosen moment. For audio analysis, both serve similar purposes — the spectrum view in JAD shows a time-averaged frequency distribution across the entire file.
Privacy first
All audio processing runs locally in your browser using FFmpeg compiled to WebAssembly. No file is ever uploaded — only metadata counters are saved for signed-in dashboard stats.