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Base64 Encoder & Decoder Online

Developer Tool

Encode any text or string to Base64 format and decode Base64 strings back to plain text. Used in HTTP Basic Auth headers, data URIs, email attachments (MIME), JWT tokens, and API payloads. All encoding/decoding happens locally in your browser.

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Next Step โ€” Complete Your Workflow

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Format JSON First โ†’
Beautify JSON before encoding to Base64 for readability
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URL-encode the Base64 โ†’
Make Base64 safe for URL query parameters

How to use Base64 Encoder & Decoder Online

  1. 1Enter your values in the fields above.
  2. 2Results calculate instantly as you type โ€” no button click needed for most tools.
  3. 3Copy the result using the Copy button.
  4. 4Use the Next Step workflow to chain into related tools.
  5. 5All processing runs locally in your browser. No data is transmitted.

Frequently Asked Questions

Is Base64 the same as encryption?

No. Base64 is encoding, not encryption. Anyone can decode Base64 without a key. Never use Base64 to secure sensitive data โ€” use proper encryption (AES, RSA).

Why does Base64 end with == sometimes?

Base64 uses padding characters (=) to make the output length a multiple of 4. One = means the original had 2 leftover bytes; == means 1 leftover byte.