CodeTK
中文

Encode & decode

JSON String Escape

Escape text into a string literal that is safe for JSON.

Need the other direction? JSON String Unescape

Runs locally in your browser

How it works

Paste your input, choose an action, and copy the result.

CodeTK does not upload, store, or analyze tool input. Any saved draft remains in this browser only.

Base64 Encoder

 Encode UTF-8 text to Base64 in your browser. /en/base64-encode

Base64 Decoder

 Decode Base64 back into UTF-8 text locally. /en/base64-decode

URL Encoder

 Percent-encode URL components and query values safely. /en/url-encode