Base64 Encode & Decode Online
Base64 encoding converts binary data into ASCII text using a set of 64 characters. It is commonly used for embedding images in HTML/CSS, encoding API credentials, transmitting binary data in JSON, and working with email attachments (MIME). Our online Base64 tool lets you encode any text to Base64 or decode Base64 strings back to readable text — instantly and entirely in your browser.
Try Emoji Picker NowHow to Encode or Decode Base64
- 1 Open the Base64 Encoder/Decoder tool.
- 2 To encode: paste your text and click "Encode." The Base64 output appears instantly.
- 3 To decode: paste a Base64 string and click "Decode." The original text is revealed.
- 4 Copy the result to your clipboard.
- 5 Use it in your code, API headers, or data payloads.
Why Use Base64 Encoding
- Encode API credentials for HTTP Authorization headers.
- Embed images directly in HTML or CSS as data URIs.
- Safely transmit binary data through text-only channels like JSON or XML.
- Real-time encoding/decoding as you type.
- No data sent to a server — everything stays in your browser.
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Use Emoji Picker FreeFrequently Asked Questions
No. Base64 is an encoding, not encryption. It transforms data into a different representation but does not secure it. Anyone can decode Base64 without a key.
Base64 is used in HTTP Basic Authentication to encode the username:password pair. It is also used to embed binary data (like images or files) in JSON payloads since JSON only supports text.
Yes. Base64 encoding increases data size by approximately 33% because every 3 bytes of input become 4 bytes of Base64 output.