🔐 Base64 Encoder & Decoder — Free Online (UTF-8 Safe)

Encode/decode Base64, URL-safe variant, or whole files — all in your browser. Free, no signup.

When to use Base64

Embedding images in CSS/HTML as data URIs · JWT token debugging (payload is Base64URL) · HTTP Basic Auth headers · storing binary in JSON/XML · email attachments (MIME). Everything runs locally — nothing is uploaded.

FAQ

What is Base64?

A way to represent binary data as 64 printable ASCII characters — used in data URIs, JWTs, email attachments and APIs. It adds ~33% size overhead.

Base64 vs Base64URL?

Base64URL swaps +/ for -_ so the output is safe in URLs, filenames and JWTs.

Is my data uploaded?

No — everything runs in your browser via TextEncoder/btoa. Nothing leaves your device.

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JWT decoder with JSON pretty-print
Batch file encoding
API for CI pipelines
Priority support

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