Description
Return a Base64 or Base64url symbol's value.
Encoded representations separate alphabet symbols, numerical digit values, byte grouping and tail padding. Recognizing one symbol or pad-bit pattern is not full payload decoding, and different alphabet variants can assign different values.
Return a Base64 or Base64url symbol's value.
When to use this tool
Use Decoding: Base64 Alphabet Symbol Value when inspecting one stated alphabet, group or padding component.
How to use the tool and how it works
- Enter symbol, alphabet. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read result. Expand result to inspect the returned fields.
Return a Base64 or Base64url symbol's value. Require alphabet standard or url and one recognized symbol; return its index in the selected 64-character alphabet.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| symbol | One symbol from the stated alphabet; matching uses the stated case convention. | Required. Text. Implementation limit: 8192 Unicode code points and 16384 UTF-16 code units. |
| alphabet | Alphabet | Required. Text; one of "standard", "url". Implementation limit: 8192 Unicode code points and 16384 UTF-16 code units. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| result | Returned object; expand its named members below. | Required. Object. |
| result.value | Value | Calculated result member: number. |
{
"input": {
"symbol": "-",
"alphabet": "url"
},
"output": {
"result": {
"value": 62
}
}
}Limitations and assumptions
- Padding is not a data symbol; no sextet assembly or complete payload validation occurs.
- Outputs are nested inside result. Inputs must satisfy both the field types and the cross-field conditions above. Invalid input causes an error; a successful false flag or documented placeholder is a different result.
Alternative or Complementary methods
Use the complete codec matching the required alphabet and canonicality rules for real encoded data.
References
Similar or alternative tools
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