HzDropsend text and small files over sound · no network

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Send a small file instead

Hold the phones within about 1 m, speaker facing the listening device.

Auto · Ready for any of the five presets.

Not listening

Waiting to listen

No packet yet—

Received text

Waiting for a message…

Symbols become characters as complete bytes arrive. Text stays provisional until verified.

Microphone / audio diagnostics

Start listening to inspect the microphone settings reported by this browser.

Processing is requested off. Unreported settings and additional browser/device filtering cannot be verified by this page.

Message history

Allow microphone access, then play the sound on the other device.

Advanced settings

For advanced users and debugging. Volume changes immediately; apply other custom changes below. Settings reset when the page reloads. Custom sender settings require Manual reception with matching values.

Sender output level. Raise it for a weak signal; lower it if sound distorts or the receiver reports excessive volume. Your device’s system volume also affects loudness. Default: 70%.