Free Base64 Encoder & Decoder Online
Encode text to Base64 or decode Base64 instantly using secure browser-based processing. Supports UTF-8 and URL-safe Base64 encoding. No data is uploaded or stored.
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Base64
What is Base64?
Base64 encoding converts binary or text data into ASCII text format. It is widely used in APIs, JWT tokens, JSON payloads, email attachments and embedded data URIs.
Base64 helps safely transmit binary data through systems designed to handle plain text only.
What is URL-safe Base64?
URL-safe Base64 replaces characters such as "+" and "/" with "-" and "_" to make encoded values safe for URLs and query parameters.
Common Base64 Use Cases
- JWT tokens and authentication systems
- Email attachments and MIME encoding
- Embedding images directly into HTML or CSS
- API payloads and JSON transport
- Binary data transfer over text-based systems
Browser-Based Privacy
All Base64 encoding and decoding happens directly in your browser. No text or encoded data is transmitted to servers.
UTF-8 Support
This tool fully supports UTF-8 text, including emojis, non-English characters and Unicode symbols.
Related Tools
Image to Base64, JWT Decoder, Hash Generator, JSON Validator
Frequently Asked Questions
What is Base64 encoding?
Base64 encoding converts binary or text data into ASCII text format for safe transport and storage.
What is URL-safe Base64?
URL-safe Base64 replaces certain characters with URL-friendly alternatives.
Does this tool upload data?
No. All Base64 processing happens locally in your browser.
Can Base64 encode Unicode text?
Yes. This tool supports UTF-8 and Unicode characters including emojis and non-English text.