Home
Text & PDF Tools
Base64 Encoder/Decoder

Text & PDF Tools

Base64 Encoder / Decoder

Convert text to Base64 or decode Base64 strings instantly. Perfect for API payloads, email attachments, and developer workflows.

Encode Decode File Support Instant

Base64 Conversion

Input

Output

Upload File No file selected

Your data never leaves your device. 100% private, no server processing.

What is Base64?

📧 Email Attachments

MIME uses Base64 to encode email attachments

🔐 API Authentication

Basic Auth uses Base64 for credentials

🖼️ Data URIs

Embed images directly in HTML/CSS

📦 JSON Web Tokens (JWT)

JWT payloads are Base64URL encoded

Features

Encode & Decode

Both directions supported

File Support

Encode any file to Base64

100% Private

Local processing only

Quick Examples

Encode "hello"

Result: aGVsbG8=

Decode "U29tZSB0ZXh0"

Result: Some text

Upload File

Get Base64 representation

Frequently Asked Questions

What is Base64 encoding?

Base64 is a method for converting binary data into ASCII text format, making it safe to transmit over text-based protocols like email or JSON APIs.

When should I use Base64 encoding?

API authentication (Basic Auth), email attachments, embedding images in HTML/CSS (data URIs), and storing binary data in JSON/LocalStorage.

Does encoding increase size?

Yes. Base64 encoding increases size by approximately 33% compared to the original binary data.

Can I encode files?

Yes! Use the file upload button to convert any file (image, PDF, document) to Base64 format.

Is this tool private/secure?

Absolutely. All encoding/decoding happens locally in your browser. No data is ever sent to any server.

What's the difference between btoa and atob?

btoa() encodes to Base64, atob() decodes from Base64. This tool handles Unicode characters properly.

Related Tools

URL Encoder/Decoder

Encode URLs for safe transmission

JSON Formatter

Format & validate JSON

HTML to Text

Convert HTML to plain text

Markdown to HTML

Convert Markdown to HTML

Text to PDF

Save encoded text as a PDF