Why would I need to use Base64 encoding?

Base64 encoding is commonly used for embedding binary data in text-based formats like JSON, XML, or HTML. It's also used in email attachments, data URIs for images, and API authentication tokens.

Base64 Encoder & Decoder: Instant Client-Side Conversion

Q: What is Base64 encoding?

Base64 is an encoding scheme that converts binary data into ASCII text format. It uses 64 characters (A-Z, a-z, 0-9, +, /) to represent binary data, making it safe for transmission over text-based protocols like email or URLs.

Q: Is my data secure when using this Base64 tool?

Yes, absolutely. All encoding and decoding happens entirely in your browser. Your data is never sent to any server, ensuring complete privacy and security.

Q: What is the maximum file size I can encode?

For browser-based encoding, we recommend files up to 2MB. Larger files may cause performance issues since all processing happens in your browser.

Q: Can I use this tool offline?

Yes, this tool works completely offline. Once the page is loaded, you can encode or decode Base64 strings without an internet connection.

Q: What is the difference between encoding and decoding?

Encoding converts plain text or binary data into Base64 format. Decoding converts Base64 strings back to their original text or data format.

Securely encode text and files to Base64 strings, or decode them back to their original format. A developer-essential tool for debugging APIs, embedding images, and managing data transmission—all without your sensitive data leaving the browser.

Last updated: 2025-01-27

Base64 Converter Tool

Mode

Encode (text → Base64)Decode (Base64 → text)

Input

Plain text

Or encode a small file (to data: URL):For privacy, files are never uploaded — everything stays in your browser.

Output

Key Features

Real-time Base64 encoding and decoding
Works completely offline in your browser
File encoding support (up to 2MB)
No data sent to servers - complete privacy
One-click copy to clipboard
Free to use, no registration required

How to Use the Base64 Encoder/Decoder

Select Mode: Choose whether you want to encode text to Base64 or decode Base64 back to text.
Enter Input: For encoding, type or paste your plain text. For decoding, paste your Base64 string.
Process: Click the "Encode to Base64" or "Decode from Base64" button to perform the conversion.
Copy Result: The converted result will appear in the output field. Click "Copy to clipboard".
File Encoding (Optional): Click "Choose File" and select a file up to 2MB to get a data URL.

Understanding Base64 Encoding

Base64 is a text-based representation of binary data, safe to send over text-only channels like email or HTTP parameters.

It is NOT encryption — Base64 data can be decoded by anyone. However, it is an essential standard for Data URIs, API tokens, and binary transfers.

Our Base64 Tool runs 100% in your browser, preserving privacy and full UTF-8 character support.

Frequently Asked Questions

What is Base64 encoding?

Base64 is an encoding scheme converting binary data to ASCII characters (A-Z, a-z, 0-9, +, /) for safe text transmission.

Is my data secure when using this Base64 tool?

Yes. All conversion runs in your browser. Nothing is sent to any server.

What is the maximum file size I can encode?

We recommend files up to 2MB for smooth browser performance.

Can I use this tool offline?

Yes! Once loaded, this tool works entirely offline as a PWA.

What is the difference between encoding and decoding?

Encoding turns plain text/files into Base64. Decoding turns Base64 back into original text/files.

Why would I need Base64 encoding?

Common uses include embedding inline images in CSS/HTML (Data URIs), sending binary payloads in JSON/APIs, and authentication headers.

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