Base64 Converter
Encode text to Base64 or decode Base64 strings instantly. Supports Unicode and emojis.
Input
Output
How to Encode/Decode Base64
- Paste your text or Base64 string in the input field
- Choose "Encode to Base64" or "Decode from Base64"
- The result appears instantly in the output field
- Copy the result to use in your projects
Why Use Base64 Encoding
API Authentication
Bearer tokens and API keys are commonly Base64-encoded for secure transmission.
Email Attachments
Email systems use Base64 encoding for MIME attachments and non-ASCII content.
Data URLs
Embed images and files in HTML/CSS as Base64 data URLs.
JSON Storage
Store binary or complex data as Base64 strings in JSON documents.
Base64 Encoder Features
Unicode Support
Full Unicode support including emojis, Chinese characters, Arabic, and all other scripts.
Instant Processing
100% client-side processing means your data never leaves your device. Fast and secure.
Copy & Download
Copy results to clipboard or download as text files for easy integration.
No Data Loss
Both encoding and decoding are completely reversible with no data loss.
Frequently Asked Questions
What is Base64 encoding?
Base64 is a method to encode binary data as ASCII text using 64 printable characters (A-Z, a-z, 0-9, +, /). It's used in emails, APIs, and data storage to safely transmit binary data as text.
Is Base64 encryption?
No, Base64 is encoding, not encryption. It's easily reversible and provides no security. Always use HTTPS and proper encryption for sensitive data.
Why does Base64 output look larger?
Base64 encodes 3 bytes into 4 characters, making the output ~33% larger than the original. This is normal and expected.
Can I encode files with this tool?
This tool works with text. For files, you need specialized tools. However, you can use data URLs to embed small images or files as Base64.
Is my data private?
Yes, all encoding/decoding happens in your browser. Your data is never sent to any server and is completely private.
What does the padding (=) mean?
Padding (= or ==) is added to make the Base64 output a multiple of 4 characters. It's required for correct decoding.
About Base64 Encoding
Base64 encoding is fundamental to many web technologies and data formats. It allows binary data to be safely transmitted through text-only channels and is widely used in modern web applications.
Common Use Cases:
- API Authentication: Bearer tokens and API keys are often Base64-encoded
- Email: Attachments and non-ASCII content are Base64-encoded in MIME
- Data URLs: Images embedded in HTML/CSS as Base64 data
- HTTP Headers: Authorization headers use Base64 for Basic Authentication
- Configuration Files: Sensitive data stored as Base64 in configs
- URL-Safe Variants: Modified Base64 for safe use in URLs without special characters