Safe Base64 Converter

Encode and decode Base64 entirely in your browser.
All conversion happens locally — your input never leaves your device.

How this Base64 converter works

This tool uses standard browser APIs to perform Base64 encoding and decoding:

• Text is converted to UTF-8 using the browser’s built-in encoder
• Base64 encoding/decoding is performed in JavaScript
• The result is shown instantly in the page

No requests are sent to a backend service, and no input is stored or logged.

You can verify this yourself by opening your browser’s developer tools and checking the Network tab while using the converter.

What is Base64?

Base64 is a binary-to-text encoding scheme commonly used to represent binary data as readable ASCII text. It is widely used in:

• APIs and HTTP headers
• JWTs (JSON Web Tokens)
• Data URLs (for images, fonts, etc.)
• Configuration files and secrets
• Email and MIME formats

Base64 is not encryption. It does not provide confidentiality — it only changes how data is represented.

URL-safe Base64

Some systems use a URL-safe variant of Base64 where:

• + is replaced with -
• / is replaced with _
• Padding (=) may be omitted

This tool supports URL-safe Base64 for compatibility with JWTs and web-safe contexts.

Privacy and security

This converter is designed to be safe to use with sensitive data:

• ✔ All processing happens locally in your browser
• ✔ No form submissions or API calls are made
• ✔ No input is stored, logged, or transmitted

Analytics or ads (if present) may load normally, but the conversion itself never triggers network traffic.

Common use cases

• Encoding data for APIs or configuration files
• Decoding Base64 values from logs or headers
• Inspecting JWT payloads (signature validation not included)
• Working with Base64-encoded files or secrets

FAQ

Is my data sent to a server?

No. Encoding and decoding are performed locally in your browser.

Is Base64 encryption?

No. Base64 is an encoding format, not encryption.

Does this support Unicode (emoji, non-English text)?

Yes. The converter uses UTF-8 encoding and correctly handles Unicode input.

Can I use this offline?

Yes. Once the page is loaded, the converter works without an internet connection.

Coming next

Planned additions may include:

• JWT decoding and pretty-printing
• File-to-Base64 and Base64-to-file conversion
• Additional encoding utilities

The focus will remain on simple, browser-only tools with clear privacy guarantees.