Free online Base64 encoder — runs entirely in your browser. No data sent to any server. Supports UTF-8 (correct handling), Base64URL (RFC 4648) for JWT tokens, MIME line splitting, per-line encoding, file encoding up to 100MB, and an Image to Base64 converter for JPG, PNG, GIF, WebP, SVG, BMP, ICO, TIFF and AVIF. Live mode, 12 languages. No sign-up. No ads. No file size limits.