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Spectrogram generator
See the frequencies of a sound or song over time as a spectrogram image.
- Free
- No sign-up
- Works on any device
Create a QR code for a link, Wi-Fi, WhatsApp, contact and more, or read one from a photo.
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Fill in the details to see your QR code.
PNG for phones, chats and websites. SVG and PDF stay sharp at any size, which is best for printing. Tip: point your phone camera at the preview to test it.
3. Style (optional): colors, dots, logo
Choose a photo or screenshot or drag it here
Works with photos of printed codes, screenshots and image files.
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- Free
- No sign-up
- Works on any device
About Spectrogram generator
Turn a sound into a picture where time runs left to right, frequency runs bottom to top and color shows loudness. Useful for spotting noise, hum lines, cut-off from MP3 compression, bird calls and hidden images in audio. Choose a linear or logarithmic frequency scale and the image size.
How to use Spectrogram generator
- Add the sound or song to analyse.
- Choose the Frequency scale and Image size.
- Generate the spectrogram and download the image.
Why use this tool?
- Private: files are processed on our server and deleted right after.
- Free, with no sign-up, no watermark and no limit on how often you use it.
- Works on phones, tablets and computers: Android, iPhone, Windows, Mac and Linux. Nothing to install.
- Accepted files: .mp3, .wav, .m4a, .aac, .ogg, .oga, .opus, .flac, .wma, .aiff, .aif, .amr, .ape, .wv …
- Convert many files at once and get them all in one ZIP.
- Options: Frequency scale, Image size
- Available in 10 languages.
Also known as
Frequently asked questions
What does a spectrogram show?
It shows how much energy a sound has at each frequency over time. Brighter areas are louder, so you can see notes, voices and noise separately.
What do the colors in a spectrogram mean?
Time runs left to right and frequency from bottom to top. Brighter or warmer colors mark louder energy at that frequency and moment in the recording.
Which frequency scale should I use?
A linear scale shows the whole range evenly, which suits technical checks. A logarithmic scale gives more room to low frequencies, matching how people hear music.
Is Spectrogram generator free?
Yes. Spectrogram generator on Toolipedia is free to use, with no sign-up and no watermark.
Is it safe to use?
Yes. Your files travel over an encrypted connection, are processed automatically, and are deleted as soon as the result is ready. Nobody looks at them.
Does it work on my phone?
Yes. It works in any modern browser on Android and iPhone, as well as on tablets and computers. There's nothing to install.
How big can my files be?
Up to 200 MB in total. You can add several files at once.
Do I need an account?
No. Just open the page and use the tool. There's no sign-up and no email needed.