Base64 Encoder / Decoder

Encode and decode Base64, encode/decode URLs, and convert files to Base64. Everything runs in your browser — no data is sent to the server.

Plain Text Input

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Base64 Output

URL-safe Line-break every 76 chars

Base64 Input

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Decoded Output

Plain Text / URL Input

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URL Encoded Output

Encode full URL (encode everything)

URL Encoded Input

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Decoded Output

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Drop a file here or click to browse

File is processed entirely in your browser — nothing is uploaded

JWT Token

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About This Tool

The Base64 Encoder/Decoder runs entirely in your browser — no data is sent to any server. It supports Base64 encoding and decoding of text (with optional URL-safe mode and line-break wrapping), URL encoding and decoding, file-to-Base64 conversion with Data URI output, and JWT token decoding (header and payload only — signature is not verified). Common uses include encoding binary data for email or API transmission, decoding authentication tokens, inspecting JWT claims and constructing inline image Data URIs for HTML.