QuickFnd Tool
Base64 Encoder
Encode text into Base64 instantly in the browser.
Base64 Encoder
About Base64 Encoder
Base64 Encoder converts plain text into Base64-encoded strings instantly in your browser. Base64 encoding is used in data URLs, email attachments, JWTs, and APIs that need to safely transmit binary data as text.
Why use Base64 Encoder?
- Encode any text string to Base64 instantly — no server needed.
- Supports URL-safe Base64 encoding (replaces + with - and / with _).
- Decode Base64 strings back to plain text in the same tool.
- Useful for understanding JWT tokens, data URIs, and API payloads.
How to use it
Type or paste the text you want to encode into the input field.
Click Encode to convert it to Base64 format immediately.
Copy the Base64 output using the Copy button.
Switch to Decode mode to reverse a Base64 string back to plain text.
Best use cases
Encoding credentials for HTTP Basic Authentication headers
Creating data: URLs for embedding images directly in HTML or CSS
Decoding the payload section of a JWT token to inspect its claims
Encoding binary data for safe transmission in JSON or XML API bodies
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Frequently asked questions
Why is Base64 output longer than the input?
Base64 encodes every 3 bytes of data into 4 ASCII characters, increasing size by approximately 33%. This is the tradeoff for making binary data safe to transmit as text.
What is URL-safe Base64?
Standard Base64 uses + and / which have special meanings in URLs. URL-safe Base64 replaces + with - and / with _ so encoded strings work safely in URLs without percent-encoding.
Is Base64 the same as encryption?
No. Base64 is encoding, not encryption. Anyone can instantly decode a Base64 string. Never use it to hide sensitive data — use actual encryption for security.
What is a JWT and how does Base64 relate?
A JSON Web Token (JWT) has three Base64url-encoded parts: header, payload, and signature. Pasting a JWT into the decoder reveals the payload claims without needing a secret key.
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