Encode, decode, or convert images to Base64 data URIs.
Base64Lab encodes text to Base64 and decodes Base64 strings back to readable text. You can also convert images to Base64 data URIs for embedding directly in HTML and CSS files. It fully supports UTF-8 characters, so international text and special symbols encode correctly. All processing happens locally in your browser so your data never leaves your device and results appear in real time as you type.
Base64 is a binary-to-text encoding scheme that represents binary data using 64 ASCII characters: uppercase and lowercase letters, digits, plus, and slash. It is widely used to safely transmit binary data through text-based channels like email, JSON payloads, and URLs. The encoding increases data size by roughly 33 percent, but the trade-off is universal compatibility with systems that only handle plain text safely.
Data URIs let you embed small images directly into HTML or CSS without separate HTTP requests. This is particularly useful for icons, small logos, and UI elements where eliminating a network round-trip improves page load speed. For larger images, a regular file reference is more efficient since Base64 encoding increases the size. A good rule of thumb is to use data URIs for assets under a few kilobytes.
Working with structured data before encoding? Use the JSON formatter to clean up your JSON first. To generate checksums for verifying data integrity, the hash generator produces MD5 and SHA hashes instantly.
Generate secure hashes with our hash generator, convert between number systems using the binary converter, or format your decoded JSON with the JSON formatter.