Base64 to JSON
Decode Base64 or base64url back into readable, validated, and pretty-printed JSON.
JSON to Base64 Encoder
Validate and encode JSON as Base64 or base64url instantly. Free, private, and 100% in your browser.
Input JSON
Base64 Output
Base64 output will appear here.
Encode JSON to Base64 Online
Base64 is the standard way to embed JSON in places that only accept plain characters: HTTP headers, query strings, environment variables, config values, and tokens. This encoder validates your JSON first and then produces standard Base64 or URL-safe base64url.
Features
Validates first
Your JSON is checked before encoding, so you never encode a broken payload by accident.
Full UTF-8 support
Accented letters, non-Latin scripts, and emoji are encoded correctly, unlike the browser's built-in btoa().
Minify before encoding
Encode exactly as typed, minified to save space, or pretty-printed.
base64url
Switch to the URL-safe alphabet (- and _ without padding) used by JWTs and URLs.
MIME line wrapping
Optionally wrap the output at 76 characters for email and PEM-style formats.
Private by design
Encoding runs entirely in your browser. Your data is never uploaded.
JSON to Base64 Example
{"user":"ada","role":"admin","exp":1767225600}eyJ1c2VyIjoiYWRhIiwicm9sZSI6ImFkbWluIiwiZXhwIjoxNzY3MjI1NjAwfQ==eyJ1c2VyIjoiYWRhIiwicm9sZSI6ImFkbWluIiwiZXhwIjoxNzY3MjI1NjAwfQHow to Encode JSON to Base64
- Paste your JSON into the input editor, or upload a .json file.
- Choose whether to encode it as typed, minified, or pretty-printed.
- Enable URL-safe or line wrapping if you need them.
- Copy the Base64 output or download it as a text file.
Frequently Asked Questions
Why encode JSON as Base64?
Base64 turns any text into a safe set of characters that survives HTTP headers, URLs, environment variables, cookies, and systems that do not handle quotes or line breaks well. JWT payloads, Kubernetes Secrets, and data URIs all use Base64-encoded JSON.
What is the difference between Base64 and base64url?
Standard Base64 uses + and / and pads with =. base64url replaces + with - and / with _ and usually drops the padding, so the result can be used in URLs and file names without escaping. JWTs use base64url.
Is Base64 encryption?
No. Base64 is an encoding, not encryption. Anyone can decode it, so never use it to protect passwords or secrets.
Does this work with non-English characters?
Yes. The JSON is first encoded as UTF-8 and then as Base64, which is the standard approach. The browser's btoa() function fails on these characters; this tool does not.
Is my JSON uploaded anywhere?
No. Encoding runs entirely in your browser. Your JSON never leaves your device.
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