Base64 Encoder & Decoder
Convert text or files to Base64 encoding, or decode Base64 back to raw text. Your data is processed directly on your device and never uploaded to any servers.
What is Base64 Encoding?
Binary-to-Text Representation
Base64 encoding translates binary files (such as images, PDF sheets, or fonts) into an ASCII string representation using a character set of 64 characters (A-Z, a-z, 0-9, +, /). This is critical when transmitting data over media channels that are designed to handle text only (such as email, XML, HTML document bodies, or CSS code stylesheets).
Browser-Side Encryption Safety
Unlike backend tools which transfer your files to a cloud database, our utility converts raw bytes to characters using modern client-side standard libraries (`btoa` and `atob` inside standard script threads). This ensures that heavy images or database dump payloads stay in your local browser sandbox context.
Frequently Asked Questions
What is the difference between Base64 and Data URI?
A standard Base64 string is just the raw converted stream (e.g. `SGVsbG8=`). A Data URI includes a metadata header prefix (e.g. `data:text/plain;base64,SGVsbG8=`) which tells browsers what MIME type the string represents, so it can display the assets inline.
Does Base64 encoding increase file size?
Yes, Base64 encoding increases file payload size by approximately 33% because every 3 bytes of raw binary data are represented using 4 ASCII characters.
How to Use Base64 Encoder / Decoder
Select Operation Mode
Choose 'Text to Base64', 'Base64 to Text', or 'File to Base64'.
Input Content
Paste text strings into the workspace or drag & drop a file asset.
Instant Conversion
Real-time RFC 4648 encoding/decoding calculates output bytes and Data URL formats.
Copy or Download
Copy converted Base64 text to clipboard or download decoded binary files.
Key Features & Capabilities
- Text & binary file Base64 encoding
- HTML Data URL generator scheme
- URL-safe Base64 encoding option
- One-click copy & file download export
- 100% browser-based private processing
100% Client-Side Privacy: All operations occur locally in your web browser memory using JavaScript and WebAssembly. Your files, text payloads, and images are never uploaded to external servers or stored in cloud databases.
Frequently Asked Questions
View All Platform FAQsIs Base64 considered encryption?
No. Base64 is an encoding scheme used to represent binary data in ASCII text. Anyone can decode Base64 back into raw bytes without a key.
Can I convert images to Base64 Data URLs?
Yes. Drop any image file into the file encoder tab to generate inline `data:image/...;base64,...` strings for HTML and CSS.
Experiencing an issue with Base64 Encoder & Decoder?
Notice a bug, calculation error, or unexpected result? Let us know.