Base64 Encoder and Decoder Online
The fastest Base64 online tool for developers. Encode or decode Base64 strings instantly for APIs, CSS Data URIs, and secure data handling. Designed for absolute privacy: your data is processed 100% locally in your browser. No uploads, no server logs, and no tracking—ever.
Base64 Encoder / Decoder
Encode plain text to Base64 or decode Base64 back to readable text.
Output
Waiting for input...
Why Use This Base64 Encoder?
A fast, privacy-first Base64 tool for encoding and decoding data used in APIs, testing, and data handling.
100% Private
All encoding runs locally. No data is uploaded.
Instant Encoding
Encode or decode strings instantly.
Two-Way Tool
Convert text to Base64 and back.
Works Everywhere
Works on desktop and mobile browsers.
Developer Friendly
Perfect for APIs, tokens, and debugging.
Completely Free
No signup, no limits, free forever.
Encode and Decode Text Using Base64
This Base64 encoder and decoder lets you convert readable text into Base64 format and decode Base64 strings back to plain text directly in your browser. The format is commonly used in APIs, authentication headers, tokens, cookies, and data transfer systems.
Developers and students often use Base64 when testing endpoints, transferring binary data as text, or embedding small data inside web requests. The tool processes everything locally so sensitive data remains on your device.
Text Encoding
Convert readable text into Base64 format.
Decode Back
Restore Base64 strings into plain text.
API Testing
Useful for headers, tokens, and debugging.
Local Processing
Data never leaves your browser.
How Base64 Encoding Works
Base64 encoding converts binary or plain text data into a set of printable ASCII characters. This allows data to be safely transmitted through systems that only support text, such as email, JSON requests, and HTTP headers.
When encoding, the browser reads the input text and transforms it into Base64 characters. Decoding performs the reverse process, restoring the original readable text. The transformation does not modify the content; it only changes its representation.
The entire process runs locally in your browser, meaning the entered information is not uploaded or stored anywhere. This makes the tool suitable for testing tokens, authentication strings, and debugging API requests safely.
ASCII Encoding
Converts data into text-safe characters.
Two-Way Conversion
Encode and decode instantly.
Secure Handling
Processing stays on your device.
Base64 Encoder – FAQs
Yes. All encoding and decoding happens locally in your browser. No data is uploaded to any server.
Any plain text such as tokens, credentials, API keys, or small data strings.
Yes. You can decode Base64 strings back to their original format.
Yes. Once loaded, the Base64 tool works fully offline.
There is no fixed limit. It depends on your browser and available memory.
No. Base64 is an encoding method, not encryption or security.
Yes. It is completely free with no signup, no ads, and no hidden limits.
Standard text is great, but sometimes you just need to speak in ASCII strings. Once you've decoded your data, you can pretty-print it using the JSON Formatter or use the URL Encoder to ensure your strings don't break your browser's address bar.
Learn how to use this tool properly
Step-by-step guide, tips, and common fixes.