Encode and decode Base62 online

Paste any text, convert it to a Base62 string that contains only letters and numbers, and convert it back — instantly, in your browser. Nothing is sent to a server.

What is Base62 encoding?

Base62 encoding represents binary data using only 62 characters: digits 0-9, uppercase letters A-Z, and lowercase letters a-z. Unlike Base64, it never introduces symbols such as +, /, or =, so the result is always safe to use directly in URLs, filenames, and identifiers without any extra escaping.

Base62 vs Base64

Base64 packs data slightly more densely, but its output can include +, /, and padding = characters that need escaping in URLs and query strings. Base62 trades a little density for an alphanumeric-only output — a common choice for short IDs, slugs, and tokens that need to look clean in a URL.

Use it in your project

npm install base62str

import Base62Str from "base62str";

const base62 = Base62Str.createInstance();
base62.encodeStr("Hello World!"); // "T8dgcjRGkZ3aysdN"
base62.decodeStr("T8dgcjRGkZ3aysdN"); // "Hello World!"