Base64 Encode / Decode

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What is Base64 Encoder & Decoder?

Base64 is a binary-to-text encoding scheme that converts binary data (like images, files) into a plain ASCII text string. It is very popular among developers because it allows you to transfer binary data over text-based protocols like JSON, HTML, or Email safely. Our Free Online Base64 Encoder & Decoder tool lets you encode any text to Base64 and decode any Base64 string back to original text. Our free Base64 encoder and decoder converts text to Base64 and back in one click.

For example, text "Hello WebToolsKit" becomes "SGVsbG8gV2ViVG9vbHNLaXQ=" in Base64. This encoding is not encryption - anyone can decode it. It is used for encoding, not for security. Common use cases are: embedding small images directly into HTML/CSS as Data URI to reduce HTTP requests, sending images in JSON API, and encoding email attachments.

How to Use Our Base64 Tool?

1. To Encode (Text to Base64): Type or paste your normal text (e.g. username:password, JSON, HTML code) in the input box and click Encode to Base64 button. The tool will instantly generate Base64 string.
2. To Decode (Base64 to Text): Paste your Base64 encoded string (e.g. SGVsbG8=) into the input box and click Decode from Base64 button. It will show you the original text.
3. Use Copy button to copy result and Clear to reset.

Why Do Developers Use Base64?

There are many practical reasons. 1. Embedding small images: You can convert a small PNG icon to Base64 and put it directly in CSS as background-image: url(data:image/png;base64,...). This saves one HTTP request. For larger images, a normal image file is usually better.. 2. Basic Authentication: In HTTP Basic Auth, username and password are sent as Base64 encoded string like `Authorization: Basic dXNlcjpwYXNz`. 3. Data URI: Storing files inside JSON or XML. 4. Email: Email systems use Base64 to send attachments safely.

Why Use WebToolsKit Base64 Tool?

• 100% Free & Instant: No signup, no limit. Encode and decode unlimited times.
• Completely Private & Secure: This is the most important feature. All encoding and decoding happens 100% inside your browser using JavaScript. Your secret data, passwords, API keys are NEVER sent to our server, never stored, never logged.
• Handles Unicode (UTF-8): Unlike many old tools, our tool correctly encodes Hindi text, emojis and special characters (UTF-8 support).

Difference Between Base64 Encoding and Encryption

Many beginners confuse Base64 with encryption. Remember: Encoding is NOT Encryption. Encoding just changes data format to make it transferable. Anyone can decode Base64 easily. Encryption uses a secret key and is meant to hide data. Never use Base64 to hide passwords or sensitive information. It is only for transport, not for security.

Privacy bullet:

Private by design: Encoding and decoding happen in your browser using JavaScript. Your input is not sent to our server. Still, never rely on Base64 to protect passwords or API keys, since it is easy to reverse.

Things to Know

Size increase: Base64 output is about 33% larger than the original data.

URL-safe Base64: Standard Base64 uses + and /, which can break URLs. The URL-safe variant uses - and _ instead.

JavaScript example (UTF-8 safe):

const bytes = new TextEncoder().encode("Hello WebToolsKit"); const b64 = btoa(String.fromCharCode(...bytes));