Encode plain text or binary data into Base64 or decode Base64 strings. Fully handles multibyte UTF-8 characters and URL-safe padding.
Base64 Encode / Decode is an air-gapped developer utility designed for maximum precision, client-side speed, and uncompromising privacy. Every operation executes entirely within your browser memory.
All computations run locally inside your browser. No strings, tokens, or files are ever transmitted to any remote servers.
Changes update asynchronously in real time as you type, with zero network lag or server queue delays.
Easily copy outputs, download formatted artifacts, or share local configurations using browser-safe states.
Fully functional without an active internet connection. Work safely on planes, trains, or air-gapped networks.
Quickly test, validate, and iterate on base64 encode / decode workflows during development without running heavy local scripts.
Safely paste sensitive production telemetry or configuration fragments into an isolated sandbox to diagnose issues rapidly.
Achieve standard-compliant, deterministic results regardless of whether you're working on macOS, Linux, or Windows.
Comply with strict enterprise security guidelines where customer data cannot be pasted into cloud web utilities.
Decode and inspect JSON Web Tokens without sending keys to any server.
Encode and decode URI strings and URL component query parameters.
Convert images to Data URI Base64 strings and preview Base64 image tags.