Base64 Encoder / Decoder

How to Encode and Decode Base64

1. Choose your mode — Select "Encode" to convert text to Base64, or "Decode" to convert Base64 back to text.
2. Enter your data — Paste or type your text or Base64 string into the input area.
3. Convert and copy — Click the convert button and copy the result with one click.

Benefits of Using Toolcairn Base64 Tool

• Instant Conversion — Encode or decode Base64 with a single click, no waiting.
• Full Unicode Support — Properly handles special characters, emojis, and multilingual text.
• Browser-Only Processing — Your data stays in your browser and is never uploaded to any server.
• Size Statistics — See input/output character counts and the encoding size overhead.
• No Signup — Use immediately without creating an account.

Frequently Asked Questions (FAQ)

What is Base64 encoding?

Base64 is a binary-to-text encoding scheme that represents binary data in an ASCII string format. It uses 64 characters (A-Z, a-z, 0-9, +, /) to represent data, with "=" used for padding. It is commonly used in email, URLs, and data storage.

Why is the encoded output larger than the input?

Base64 encoding increases data size by approximately 33%. This is because every 3 bytes of input are represented as 4 Base64 characters. This trade-off is necessary to ensure the data can be safely transmitted through text-based systems.

Can I encode binary files?

This tool supports text-to-Base64 encoding. For encoding binary files like images, you would need a file-based encoder. We plan to add file upload support in a future update.

Is Base64 encryption?

No. Base64 is an encoding scheme, not encryption. It does not provide any security. Anyone can decode a Base64 string. Never use Base64 to protect sensitive information.

What are common uses for Base64?

Common uses include embedding images in HTML/CSS (data URIs), encoding email attachments (MIME), transmitting binary data in JSON APIs, and encoding authentication credentials in HTTP headers (Basic Auth).