Lab · Developer tools
Base64 Lab is a free online tool that encodes text to Base64, decodes Base64 back to readable text or raw bytes, and turns small files into data URIs — entirely in your browser, so sensitive content never leaves your device. Paste a blob, drop a file, or clean up a broken payload; every conversion is instant and local.
URL-safe Base64 (- and _) is not handled here — this lab works with the standard +/= alphabet. Everything runs locally; the only network request this page makes is the font stylesheet.