Base64 Encode/Decode API

Encode and decode Base64 strings online. Supports UTF-8 text and binary data. Fast, secure, client-side processing.

The Base64 Encode/Decode is also available as a free REST API. Send a POST request with a JSON body to https://dot.tools/api/tools/base64 — no authentication, no API key, CORS enabled. Successful calls return { "ok": true, "result": { … } }; failures return HTTP 400 or 422 with an error body.

Request body

Field	Type	Required	Description
`mode`	"encode" \| "decode"	required	Whether to encode raw text to Base64 or decode Base64 back to text.
`input`	string	required	The raw text to encode, or the Base64 string to decode.

Response

Field	Type	Required	Description
`output`	string	required	The encoded Base64 string, or the decoded raw text.

Example request

curl -X POST https://dot.tools/api/tools/base64 \
  -H 'Content-Type: application/json' \
  -d '{
  "mode": "encode",
  "input": "{\n  \"name\": \"Bitgate Tools\",\n  \"version\": \"2.0.0\",\n  \"description\": \"Developer utility vault\",\n  \"features\": [\"base64\", \"jwt\", \"json\", \"hashing\"],\n  \"clientSide\": true\n}"
}'

Sample response

{
  "ok": true,
  "result": {
    "output": "ewogICJuYW1lIjogIkJpdGdhdGUgVG9vbHMiLAogICJ2ZXJzaW9uIjogIjIuMC4wIiwKICAiZGVzY3JpcHRpb24iOiAiRGV2ZWxvcGVyIHV0aWxpdHkgdmF1bHQiLAogICJmZWF0dXJlcyI6IFsiYmFzZTY0IiwgImp3dCIsICJqc29uIiwgImhhc2hpbmciXSwKICAiY2xpZW50U2lkZSI6IHRydWUKfQ=="
  }
}

Use the free Base64 Encode/Decode in your browser, read the Base64 Encode/Decode guide, or import the full OpenAPI specification.