Base64 Encoder/Decoder

Encode text to Base64 or decode Base64 to text instantly. Supports URL-safe encoding, file uploads, auto-detection, and bidirectional conversion.

Features

• Encode text or files to Base64 and decode back to text
• URL-safe Base64 option for query params and cookies
• Auto-detect input (encode vs decode) when possible
• File upload for images or small binaries
• Copy result or download; all client-side

Why use this tool

Encode payloads for APIs, decode auth or data tokens, or embed small binaries in JSON or URLs. URL-safe mode avoids breaking links.

Try it

Try Base64 Encoder/Decoder at Spoold →

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Spoold is a free developer toolbox that detects what you paste and opens the right tool.

• No sign-up – Use every tool without an account.
• Runs in your browser – Your data stays on your device; we don’t store or log your input.
• Paste and go – Paste JSON, HTML, JWT, curl, Base64, or any text on the homepage and Spoold suggests the right tool.
• One place for many tools – JSON formatter, JWT decoder, Base64, UUID generator, regex tester, curl-to-code, and more.

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