New device. No WiFi yet. You need the password from the device that has it - different ecosystem, different account, no shared keychain. You could read it out character by character. Or you could chirp it in two seconds.
How it works
1
Type or paste the WiFi password
Open chirpfile.com on the device that knows the password. Paste it into the text field.
2
It plays as a short sound
The password encodes into a 1-2 second audio signal. In ultrasonic mode, it's inaudible.
3
The other device hears it
The receiving device picks up the chirp through its mic and displays the password, ready to copy.
No server. No internet. Purely acoustic.
WiFi passwords are under 120 characters, which means they take the purely acoustic path - no relay, no upload, no server, no internet required on either device. The password exists as a sound wave for about 1.5 seconds and nowhere else. Nothing is logged, nothing is stored, nothing touches a server.
When you need this
New iPhone that isn't on WiFi yet
Can't receive an AirDrop without WiFi. Can't use Apple's password sharing across different Apple IDs. Open chirpfile.com over cellular, hear the chirp, connect.
Android device that can't reach an Apple keychain
Apple's WiFi password sharing only works between Apple devices. chirpfile works between anything.
Sharing with a guest's device
No need to read the password aloud, spell it out, or text it. Chirp it in two seconds.
Work device with no shared account
You know the WiFi password but there's no shared keychain or cloud account to sync through. chirpfile bridges the gap with sound.
Try it now
Open chirpfile.com on two devices. Type any short text. Hit send.
No. Text under 120 characters - which covers every WiFi password - encodes directly into the audio signal. Zero servers, zero relay, zero network. Purely acoustic.
The receiving device isn't on WiFi yet - how does it run chirpfile.com?
It needs some internet connection - cellular works. Open chirpfile.com over cellular, hear the chirp, get the password, connect to WiFi.
Can I use this for other passwords too?
Yes. Any text under 120 characters - OTP codes, login passwords, door codes, anything - takes the same purely acoustic zero-server path.