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Base62 Encoder & Decoder
Encode a number to Base62 and decode it back.
Short IDs from big numbers
Base62 packs a number into digits and letters, giving a much shorter, URL-friendly string than decimal. It is the trick behind short links and compact identifiers.
The number 123456789 becomes 8M0kX in Base62. The converter goes both ways and uses big-integer math, so even huge IDs convert without losing precision.
Exact and private
The conversion runs in your browser, so nothing you enter is uploaded.
Frequently Asked Questions
What is Base62?
A number encoding using 0-9, A-Z, and a-z — 62 characters — that produces short, URL-safe identifiers.
Where is it used?
Short links, compact IDs, and anywhere a long number needs a shorter alphanumeric form.
Does it handle big numbers?
Yes. It uses big-integer arithmetic, so very large numbers convert exactly.
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