Plain text
Base64
Type on the left; result appears here
Why a local Base64 tool
Local, no server
Many online base64 tools post your content to a server. JSONfree runs entirely in your browser.
UTF-8 & CJK
Handles Chinese, Emoji and multibyte text correctly.
Copy / download
Copy or save results to fit your workflow.
Base64
Base64 Encode & Decode
Text ↔ Base64 · UTF-8 · Copy / download · Runs locally
Local · No upload
Everything runs in your browser — inputs and results never reach a server.
Ready to use
No signup, no install, works offline.
Free · No ads
Fully free, no popups, no tracking.
Base64 Encode & Decode Online｜UTF-8 & CJK｜URL-safe Variant｜Runs Locally — No Upload
Two-way
Encode text or decode Base64, in real time.
URL-safe
Switch to -_ alphabet for URL / filename safe output.
UTF-8 friendly
Multibyte text encodes without corruption.
Copy / download
One-click copy or download.
Local · no upload
Runs in your browser; nothing uploaded.