JSONHack – Base64 Encoding Guide

What is Base64 Encoding & Why It’s Used?

Base64 is a method of converting binary data (like images, files, or bytes) into a text format. It is one of the most common encoding techniques used in web development, APIs, email processing, and cryptography.

Base64 is not encryption — it is only an encoding technique. Its purpose is to ensure data remains intact during transport by converting it into a safe, text-based format.

How Base64 Works

Base64 takes binary data and breaks it into 6-bit groups. Each 6-bit group is mapped to a character from the Base64 index table (A–Z, a–z, 0–9, +, /).

The output is always in a readable string format using only 64 characters — hence the name Base64.

Example

Hello

SGVsbG8=

Why Base64 Is Used

• To embed images inside HTML/CSS using data URLs
• To send files over APIs safely
• To store binary data in JSON
• To encode email attachments (MIME)
• To avoid text corruption when transmitting data

Common Use Cases

1. Embedding Images in HTML

You can convert an image to Base64 and embed it directly:

<img src="data:image/png;base64,...">

2. APIs Using Base64 for File Transfer

Many APIs accept file uploads as Base64 strings instead of binary files. This helps avoid encoding problems.

3. Storing Data in JSON

Binary data cannot be placed directly in JSON. Base64 solves this by converting it into text.

Base64 Encoding & Decoding Online

Use JSONHack tools to convert Base64 easily:

• Base64 Encoder
• Base64 Decoder
• JSON to String / String to JSON Tools
• Online JSON Formatter & Pretty Printer

Base64 Is Not Encryption

Many beginners confuse Base64 with security. Base64 is NOT a security algorithm — it can be decoded easily.

Advantages of Base64

• Safe for text-based systems
• Works across browsers and platforms
• Prevents data corruption
• Simple to encode/decode

Disadvantages of Base64

• Increases data size by ~33%
• Not secure
• Not suitable for large binary files

Conclusion

Base64 is an essential encoding technique for developers. Whether you are working with APIs, JSON, emails, or web assets, Base64 helps safely convert binary data into readable text. Use the Base64 tools on JSONHack to encode or decode instantly.