Base64 Encoder / Decoder

Encode and decode Base64 in your browser. UTF-8 and URL-safe variants.

ModeURL-safe (base64url)

Input (text)

Output

SGVsbG8sIENvdW50cnlEZXZzIPCfkYs=

How to encode or decode Base64

1
Choose a modeEncode text → Base64, or decode Base64 → text.
2
Toggle URL-safe (optional)Base64URL replaces +, / with -, _ and drops = padding — common in JWTs and URLs.
3
Copy or swapCopy the output, or swap it to the input to chain conversions.

Is Unicode supported?

Yes. Input is UTF-8 encoded before Base64 conversion, so emoji and non-ASCII text round-trip correctly.

What is base64url?

A URL-safe variant that replaces + with -, / with _, and omits padding. It's the encoding used in JWTs.

Is this private?

Yes — encoding and decoding both run entirely in your browser. Nothing is sent to our servers.

Max length?

No hard limit, but very large inputs (10+ MB) may slow your browser.

Percent-encode and decode URL components. Full-URL mode preserves scheme and host; component mode escapes reserved chars.

Format, validate, minify, and auto-fix JSON in your browser. Fixes trailing commas, unquoted keys, single quotes, comments, and more.

Decode a JWT to see its header and payload. Runs entirely in your browser — tokens never leave the page.

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