What is the difference between Base64 and Base64URL output?
Standard Base64 uses +, /, and optional = padding. Base64URL replaces + and / with - and _ and removes padding so the result is safer inside URLs and tokens.
JSON to Base64 Converter
Encode valid JSON into standard Base64 or URL-safe Base64URL with UTF-8-safe processing, minify or pretty controls, a compact audit strip, and local-only browser execution.
JSON Input
JSON: validMode: standardSerialize: minifiedInput: 52 B
Paste valid JSON to encode it into Base64.
All processing happens locally in your browser. No data is uploaded or stored.
Base64 Output
JSON: validMode: standardSerialize: minifiedRun: mainDuration: 0msSize delta: 0 B
Encoded Base64 will appear here as soon as the JSON input is valid and processed.
JSON: validMode: standardSerialize: minifiedInput: 52 B
Paste valid JSON to encode it into Base64.
All processing happens locally in your browser. No data is uploaded or stored.
How to Use
- Paste valid JSON into the input panel or upload a local JSON file.
- Choose whether the encoded payload should preserve the original JSON text, minify it, or pretty-print it first.
- Switch between standard Base64 and URL-safe Base64URL when your destination requires URL-safe output.
- Copy or download the Base64 result, or open it directly in the Base64 decoder to round-trip inspect it.
Related Tools
Frequently Asked Questions
Why does the tool validate JSON before encoding?
This tool is intentionally JSON-first. It blocks invalid input so you do not accidentally encode broken payloads and then debug the wrong thing later.
What does Preserve input mode do?
Preserve mode keeps the original validated JSON text exactly as entered, including whitespace. Minified and Pretty modes first normalize the JSON text before encoding it.
Does this tool handle emoji and non-Latin text correctly?
Yes. The encoder converts the JSON text to UTF-8 bytes before producing Base64, which avoids the Unicode problems that come from passing arbitrary strings straight into btoa().
Is my JSON uploaded anywhere?
No. All validation, serialization, and Base64 encoding happen locally in your browser. No data is uploaded or stored.