WebSocket Frame Explainer
Decode WebSocket frame bytes into opcode, flags, mask and payload.
About the WebSocket Frame Explainer
Paste hex bytes from a WebSocket frame to decode the FIN bit, opcode, mask flag, payload length and unmasked payload, with each field explained.
Popular uses
- websocket
- websocket frame
- rfc 6455
- frame decoder
Examples
Example
81 05 48 65 6c 6c 6fOutput
Text frame, FIN=1, payload: HelloKeyboard shortcuts
- Copy the main outputCtrl / ⌘ + Shift + C
- Download the resultCtrl / ⌘ + S
- Share this toolCtrl / ⌘ + Shift + S
- Reset the inputsAlt + R
- Open the tool search paletteCtrl / ⌘ + K
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Frequently asked questions
Read more
- Debugging WebSockets: handshake, close codes, and reading a transcript
How to test a ws:// or wss:// endpoint from the browser, and what the common close codes actually mean.
Version 1.0.0 · Updated 2026-08-09 · Runs entirely in your browser