Base64 Encoder / Decoder

Encode and decode Base64 strings with URL-safe option — entirely in your browser.

No data leaves your browser.

URL-safe (base64url)

Input

Frequently Asked Questions

Is my data safe?: Yes. All processing happens in your browser. Your data never leaves your device.
What is URL-safe Base64?: URL-safe Base64 (base64url) replaces + with - and / with _, making it safe to use in URLs and filenames without percent-encoding.
Does it support Unicode?: Yes. Text is encoded as UTF-8 bytes before Base64 encoding, so all Unicode characters are fully supported.