Toolsvana→Utility Tools→Base64 Encoder/Decoder

Base64 Encoder/Decoder

Encode and decode Base64 strings

Text to Encode

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Base64 Output

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Usage Tips

• Base64 is commonly used for encoding binary data in text format
• Perfect for embedding images or files in HTML/CSS
• Use the file upload feature for easy text file encoding
• All encoding/decoding happens locally in your browser

About Base64 Encoder & Decoder

Our Base64 encoder and decoder is a free online tool that converts text to Base64 encoding and decodes Base64 strings back to plain text instantly. Base64 is a binary-to-text encoding scheme that represents binary data using a set of 64 ASCII characters, making it safe to transmit over text-based protocols like HTTP, SMTP, and JSON.

The Base64 encoding process works by taking groups of three bytes (24 bits) and splitting them into four 6-bit values, each mapped to a printable ASCII character from A-Z, a-z, 0-9, +, and /. This makes it an essential tool for web developers who need to embed images in CSS, encode API authentication tokens, or safely transmit binary data through text-only channels.

This tool supports full Unicode text encoding, automatically handles data URI prefixes during decoding, and strips whitespace for cleaner results. Whether you are encoding credentials for HTTP Basic Authentication, embedding inline images, or debugging encoded payloads, this tool provides instant, accurate results with zero server interaction.

Key Features

Instant real-time Base64 encoding and decoding as you type
Full Unicode and UTF-8 character support for international text
Automatic data URI prefix detection and stripping during decode
File upload support for encoding text files directly
One-click copy to clipboard for quick workflow integration
Download encoded or decoded output as a text file
Real-time character count for both input and output
Clean toggle between Encode and Decode modes
Whitespace-tolerant decoding for pasted multi-line Base64
Dark and light mode support for comfortable use

How to Use the Base64 Tool

Select your mode: Click "Encode" to convert plain text to Base64, or click "Decode" to convert a Base64 string back to readable text.
Enter your input: Type or paste your text into the input area on the left. You can also click "Upload File" to load a text file from your device when in Encode mode.
View instant results: The converted output appears automatically in the output panel on the right as you type, with no need to press a button.
Copy the output: Click the "Copy" button above the output to copy the result to your clipboard for use in your code, API calls, or configurations.
Download if needed: Click "Download" to save the output as a .txt file. Encoded output saves as "encoded.txt" and decoded output saves as "decoded.txt".

Use Cases

Data URI Embedding: Encode images, fonts, and SVGs as Base64 data URIs for inline embedding in HTML and CSS without external file requests.
API Authentication: Encode username and password pairs for HTTP Basic Authentication headers used in REST API calls.
Email Attachments: Encode binary attachments for MIME-encoded emails transmitted over SMTP text protocols.
JWT Token Inspection: Decode the payload section of JSON Web Tokens to inspect claims and expiration data during development.
Cookie Storage: Encode complex data structures for safe storage in browser cookies that only support ASCII text characters.
Configuration Files: Encode secrets and binary data for inclusion in YAML, JSON, or XML configuration files used by cloud platforms.
Debugging Encoded Data: Decode Base64 strings found in logs, API responses, and database records to inspect their original content.

Frequently Asked Questions

Is this tool free?

Yes, our Base64 encoder and decoder is completely free to use with no limits, no sign-ups, and no restrictions on usage.

Is my data secure?

Absolutely. All encoding and decoding happens entirely in your browser. Your data is never uploaded to a server, stored in a database, or transmitted over the network. Everything stays on your device.

Is Base64 encryption?

No, Base64 is an encoding scheme, not encryption. It transforms data into a different representation but does not provide any security. Anyone with the Base64 string can decode it. For security, use proper encryption algorithms.

Why does Base64 increase file size?

Base64 encoding increases data size by approximately 33% because it represents every 3 bytes of input as 4 ASCII characters. This trade-off is acceptable when you need text-safe transmission of binary data.

Can I encode binary files like images?

This tool is designed for text-to-Base64 encoding. For encoding binary files like images, you would need a tool that reads the file as binary data. However, you can use this tool to decode Base64-encoded image strings to verify their content.

What characters are used in Base64?

Standard Base64 uses 64 characters: uppercase A-Z, lowercase a-z, digits 0-9, plus (+), and forward slash (/). Padding is done with the equals sign (=). URL-safe Base64 replaces + and / with - and _ respectively.

Tips & Best Practices

Check for data URI prefixes: When decoding, the tool automatically strips "data:...;base64," prefixes, so you can paste complete data URIs directly.
Use for small assets only: While Base64 embedding eliminates HTTP requests, the 33% size increase means it is best for small images and icons, not large files.
Verify decoded output: After decoding, always verify that the output matches your expected text, especially when dealing with multi-byte Unicode characters.
Handle line breaks: Some systems insert line breaks in Base64 output. This tool handles them gracefully during decoding by stripping all whitespace automatically.
Test API credentials: Use the encoder to create Base64-encoded credentials for HTTP Basic Auth headers in the format "username:password".