ThinAir

Static, browser-only file transfer. WebRTC for the file. QR codes, text, and audio chirps for the handshake.

The file moves over WebRTC.
The handshake moves through QR codes, text, and audio chirps.
No storage backend.
No uploaded files on a server.
No account.
No paid service.

Live

GitHub Pages: https://mbarlow.github.io/thinair/

Open the page on two devices, pick a file on one, pair the devices, transfer.

Modes

• Send / Receive — pick file (sender), pair via QR code, audio chirp, or pasted text, then transfer.
• Manual Pair — copy/paste only. No camera or microphone needed.
• Diagnostics — check WebRTC, microphone, camera, and STUN reachability.

Constraints (v1)

• Both devices must be online during the transfer (no relay, no storage).
• Audio chirp signaling carries small payloads only — full WebRTC offers usually need QR or text.
• No TURN server. Some restrictive networks will fail.
• Google STUN is the only external network helper.

Layout

index.html
styles.css
src/
  app.js, router.js
  webrtc/   peer.js, file-transfer.js, signaling.js
  qr/       qr-generate.js, qr-scan.js
  audio/    profiles.js, framing.js, chirp-encode.js, chirp-decode.js
  codec/    base.js, checksum.js, compress.js
  ui/       home-view.js, send-view.js, receive-view.js, manual-view.js,
            diagnostics-view.js, signaling-widgets.js, util.js

No build step. Vanilla ES modules. CDN-loaded qrcode, jsQR, and pako.

Spec

See PROJECT.md.