Comprehensive developer toolkit to encode, decode, format, and visualize Base64 data for JSON, images, files, and text strings with RFC 7515 Base64URL and Data URI support.
Encode valid JSON into Base64 or Base64URL with UTF-8-safe processing, serialization controls, and a compact size audit.
Decode Base64 and Base64URL strings into readable JSON or raw text with JWT, data URI, and large-payload support.
Decode Base64 and Base64URL strings into text, JSON, or hex with JWT detection and format auto-detection.
Encode text and files into standard Base64 or Base64URL with line wrapping, data URI generation, and large file support.
Convert PNG, JPG, SVG, WebP, GIF, BMP, AVIF, ICO, TIFF, and HEIC images to Base64 Data URLs with EXIF viewer, code snippets, batch processing, and optimization.
Decode Base64 strings or Data URIs back into PNG, JPG, GIF, WebP, SVG, BMP, AVIF, and HEIC images with instant preview and download.
Base64 Tools are browser-based utilities that allow developers to encode text, JSON, files, and binary graphics into ASCII Base64 or Base64URL strings, as well as decode raw Base64 strings back into original text, JSON trees, or downloadable files.
Standard Base64 uses + and / characters with = padding, which can cause syntax issues in URLs or HTTP headers. Base64URL replaces + with - and / with _, and strips trailing = padding, making it 100% safe for JWT tokens and URL query strings.
No. All Base64 encoding, decoding, image processing, and hashing operations run 100% locally inside your web browser using HTML5 APIs and Web Crypto. Your data never leaves your device.
Base64 encoding increases data size by exactly 33.33% because every 3 binary bytes (24 bits) are expanded into 4 printable ASCII characters (24 bits represented as 6-bit index offsets).