Security Tool

Base64 Encoder / Decoder

Free Base64 Encoder & Decoder - Encode and decode Base64 strings for data transmission and storage. No login, no sign in, no registration required. Essential tool for developers working with APIs, data encoding, and secure data handling.

Text to encode

We process everything locally in your browser. Paste any text or base64 string.

Input

12 characters1,000,000 max

Text is ready for encoding. Results update in real-time.

Controls

Switch between encode and decode modes, then copy or download the result.

Operation mode

Download result

ReadyReady

Conversion completed successfully. Copy or download the result.

Bidirectional conversion

Encode text to base64 or decode base64 back to text instantly.

Unicode support

Properly handles all Unicode characters and special symbols.

Output

Your base64 encoded result. Copy or download once everything looks right.

SGVsbG8gV29ybGQh

Encode and decode base64 in minutes

Convert text to base64 or decode base64 back to text instantly, all without leaving your browser.

Paste or type your text

Enter any text you want to encode, or paste base64 to decode. Everything processes locally in your browser.

Supports text of any length with instant conversion.
Handles Unicode characters and special symbols correctly.

Choose encode or decode

Switch between encoding text to base64 or decoding base64 back to text.

Encoding converts plain text to base64 format.
Decoding converts base64 back to readable text.

Get instant results

See the converted output immediately. All processing happens in real-time.

Results update as you type or paste.
Error messages help identify invalid base64 strings.

Copy or download

Copy the result to clipboard or download it as a text file.

Download files keep UTF-8 encoding.
Copy buttons work instantly with all formats.

Where teams rely on base64 encoding

Speed up API development, data transmission, and security workflows with instant base64 conversion.

API & web development

Encode and decode data for API requests, authentication tokens, and data transmission.

Encode credentials for basic authentication.
Decode JWT tokens and API responses.
Handle base64-encoded data in web applications.

Data storage & transfer

Encode binary data or text for safe storage and transmission across systems.

Encode images and files for embedding in JSON.
Decode base64-encoded data from databases.
Prepare data for email attachments and URLs.

Security & encryption

Use base64 encoding as part of security workflows and data obfuscation.

Encode sensitive data before transmission.
Decode encoded payloads for analysis.
Work with encoded certificates and keys.

Base64 encoding best practices

Follow these guidelines to use base64 encoding effectively and securely.

Effective encoding practices

Use base64 encoding correctly for data transmission and storage formats.

Base64 encoding is not encryption—it's encoding. Don't use it for security.
Base64 increases data size by approximately 33% compared to the original.
Always validate base64 strings before decoding to avoid errors.
Use base64 for data transmission, not for storing sensitive information.
Handle Unicode characters properly by using UTF-8 encoding.
Remove whitespace from base64 strings before decoding.
Base64 is commonly used in data URLs, email attachments, and API authentication.

Base64 encoder FAQs

Get answers about security, limits, and the encoder's capabilities.

Does encoding happen locally?

Yes. Everything runs in your browser—no data leaves your device. Your text is processed entirely on your computer.

Is base64 encoding secure?

No. Base64 is encoding, not encryption. It's easily reversible and should not be used for security purposes. Use it for data transmission and storage formats only.

Can I encode Unicode characters?

Yes. The tool properly handles Unicode characters by encoding them to UTF-8 before converting to base64, ensuring all characters are preserved correctly.

What happens if I try to decode invalid base64?

The tool will show an error message indicating that the input is not valid base64. Make sure to remove any whitespace or invalid characters before decoding.

Can I download the encoded/decoded result?

Yes. Use the download button to save the result as a UTF-8 text file. The file will contain exactly what you see in the output.