Toolipedia- Free
- No sign-up
- Works on any device
No tool matches your search.
- 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.
- Free
- No sign-up
- Works on any device
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.
Looking for QR codes…
Note frequency chart
Every note's frequency in Hz, MIDI number and wavelength, with a tone to play.
- Free
- No sign-up
- Works on any device
About Note frequency chart
Look up the frequency in hertz, MIDI number and wavelength of every note, and play its tone. Standard tuning sets A4 to 440 Hz, and each octave up doubles the frequency, with each semitone multiplying it by about 1.0595. Handy for tuning instruments and sound design.
How to use Note frequency chart
- Set the options above. The result updates live.
- Change anything until it's just right.
- Copy the result or download it.
Why use this tool?
- Private: everything happens in your browser. Nothing you enter is uploaded.
- 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.
- Available in 10 languages.
Also known as
Frequently asked questions
What frequency is middle C?
Middle C, known as C4, is about 261.63 Hz when A4 is tuned to 440 Hz. Its MIDI note number is 60.
Is Note frequency chart free?
Yes. Note frequency chart on Toolipedia is free to use, with no sign-up and no watermark.
Is it safe to use?
Yes. Everything is worked out in your browser, and nothing you enter is sent to our server.
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.
Do I need an account?
No. Just open the page and use the tool. There's no sign-up and no email needed.