Encoder & Decoder – Free Online Converter

Base64 encoder and decoder tool – Convert text to Base64 format and decode Base64 strings instantly with our free online converter. Encode files, create data URIs, use URL-safe encoding, and process text in real-time. Our Base64 tool works 100% in your browser with complete privacy — no data is ever uploaded or stored on servers

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Text to Base64 Encoder

Convert plain text to Base64 encoded string

Input Text 0 characters

URL-Safe Encoding (Replace +/= with -_~)

Base64 to Text Decoder

Convert Base64 encoded string back to plain text

Base64 Input 0 characters

URL-Safe Decoding (Convert -_~ to +/=)

File to Base64 Encoder

Convert files to Base64 encoded data URI

Click to upload or drag & drop file here

Max file size: 10MB

Include Data URI prefix (data:mime/type;base64,...)

Conversion History

Conversion Info

Input Length

Output Length

Size Increase

~33%

📊 About Base64 Encoding

Base64 encoding converts binary data into ASCII text format using 64 characters (A-Z, a-z, 0-9, +, /). Encoded data is approximately 33% larger than the original.

🔒 Privacy Guaranteed

All conversions happen locally in your browser. No data is uploaded to servers or stored anywhere. Your files and text remain completely private.

Select mode - Choose Encode, Decode, or File Encoder.

Enter data - Paste text, Base64 string, or upload a file.

Convert instantly - Click the button for real-time conversion.

Copy or download - Use your converted data immediately.

🔧 Common Use Cases

Embed images in HTML/CSS as data URIs
Encode API credentials and tokens
Transfer binary data in JSON/XML
Email attachment encoding
Store binary data in databases

💡 Features

Real-time text encoding/decoding
File to Base64 conversion
URL-safe Base64 support
Copy and download results
Conversion history tracking

Select mode - Choose Encode, Decode, or File Encoder.

Enter data - Paste text, Base64 string, or upload a file.

Convert instantly - Click the button for real-time conversion.

Copy or download - Use your converted data immediately.

How to Use the Base 64 Encoder and Decoder

Select Mode: Choose between Encode (text to Base64), Decode (Base64 to text), or File Encoder.
Enter Data: Paste your plain text or 64 base encoded string into the input box, or upload a file for conversion.
Toggle Options: Select "URL-Safe Encoding" if you need to replace standard characters (+/=) with URL-friendly ones (-_~).
Convert: Click the "Encode to Base64" or "Decode" button for instant real-time results.
Manage Results: Copy your converted data or download it immediately. You can view your recent activity in the Conversion History section.

Why Use Our Free 64 Base Converter?

Real-Time Processing: Get instant results as you type or click, with automated calculations for input and output length.
URL-Safe Support: Easily generate web-ready strings that are compatible with URL parameters and file systems.
File Encoding: Convert entire files into Base64 format for easy embedding and data transfer.
Privacy Guaranteed: All conversions happen locally in your browser; your data is never uploaded to any server.
Technical Insights: Monitor the "Size Increase" (typically ~33%) to understand the impact of encoding on your data size.

FAQ

1. What is base 64 encoding?

Base64 is a process that converts binary data into an ASCII text format using 64 specific characters (A-Z, a-z, 0-9, +, /).

2. Why does the file size increase after encoding?

Encoded data is approximately 33% larger than the original data because every 3 bytes of binary data are converted into 4 characters of text.

3. Is this 64 base decoder secure?

Yes. Because the conversion happens entirely within your web browser, your files and text remain completely private and are never stored on our servers.