Base64 Encoder / Decoder

Encode text or images to Base64, and decode Base64 strings back to their original form. Supports UTF-8 text, data URLs, and file input. All processing happens locally in your browser.

Image to Base64

Base64 Encoder/Decoder — Text and Image Base64 Online

ToolOverview

A fast, free Base64 encoder/decoder that runs entirely in your browser. Base64 represents binary data using 64 printable characters, widely used for email attachments, URL parameters, inline images, API tokens, and JWT payloads. All processing happens in client-side JavaScript — your sensitive strings and files never leave your device.

How to use

Choose mode: Text encode, Text decode, or Image → Base64
Paste text (or drag a file) into the input area
Output appears instantly on the right; click "Copy" to use

Use Cases

Embedding API credentials or tokens inside JSON/YAML config
Inlining small images in HTML / CSS via data: URLs
Converting binary attachments to printable text for email or logs
Handling JWT and Basic Auth credentials in web applications

FAQ

Q: Is Base64 encryption?
A: No — it is encoding only. Anyone with the Base64 string can decode it. Use real encryption for sensitive data.

Q: Will Chinese / emoji be handled correctly?
A: Yes. The tool uses UTF-8 by default and processes all Unicode.

Q: Can I paste the output straight into code?
A: Yes. Line breaks are auto-removed; copy and use.

Tips & Related Tools

Base64 inflates data by ~33%. For small strings this is fine, but for large files use proper binary transfer.

Inline images via data: URLs are great for icons <10 KB; large images bloat HTML.

Need other encodings? Try "URL Encoder", "Hex ↔ Text", or "Binary ↔ Text".

Common Use Cases

Use the Base64 Encode/Decode online for these scenarios:

Frontend development: Embed images as Base64 strings in CSS/HTML to reduce HTTP requests
Data transmission: Safely transmit binary data in URLs or JSON (files, icons)
API debugging: Decode JWT tokens, HTTP Basic Auth credentials
Email attachments: Understand how attachments are Base64-encoded in MIME
Data storage: Save small binary assets in plain-text formats (XML, JSON)

Frequently Asked Questions

Here are the most common questions:

Q: Is Base64 encryption?
A: No. Base64 is just an encoding scheme with no security. Anyone can decode it. Use real encryption (AES, RSA) for security.

Q: How much larger is the Base64 output?
A: About 33% larger. Every 3 bytes of input becomes 4 Base64 characters.

Q: Can Base64 encode Chinese characters?
A: Yes. Convert to UTF-8 byte sequence first, then Base64 encode.

Base64 Encoder / Decoder