6️⃣ Base62 Encoder / Decoder
Base62 uses only letters and digits (no +, / or =), making it safe for URLs and short IDs — encode or decode instantly.
11 chars → 15 Base62 chars (0–9 A–Z a–z)
How the base62 encoder / decoder works
Base62 represents data using the 62 alphanumeric characters 0–9, A–Z and a–z — and nothing else. The tool treats your input's bytes as one big number and re-expresses it in base 62 (the same big-integer scheme Base58 uses), with leading zero bytes preserved as leading "0" characters so the value round-trips exactly. Because it avoids +, / and = — the characters in Base64 that need escaping in URLs — Base62 output can be dropped straight into a URL, filename or identifier without encoding.
Base62 is a transport encoding, not encryption — it is fully reversible and keeps no secret. It is popular for short URLs, database IDs and slugs precisely because it is URL-safe and padding-free, at the cost of being a little larger than Base64. Note there is no single official Base62 standard for arbitrary bytes, so a value encoded here uses the common big-integer (Base58-style) method with the 0–9A–Za–z alphabet; another library using a different alphabet order won't match. Everything runs locally in your browser.
Frequently asked questions
What is Base62?
A binary-to-text encoding that uses only the 62 alphanumeric characters (0–9, A–Z, a–z). It has no padding and no symbols, which makes the output safe to use directly in URLs, filenames and identifiers.
How is Base62 different from Base64?
Base64 uses 64 characters including + and / (and = for padding), which must be escaped in URLs. Base62 drops those three, using only letters and digits, so it is URL-safe with no padding — but its output is slightly longer because it carries fewer bits per character.
What is Base62 used for?
Short URLs, database and object IDs, and slugs. Services that turn a numeric ID into a short code (like a URL shortener) typically use Base62 because the result is compact and safe to put in a link.
Why might my Base62 not match another tool?
There is no single official Base62 standard for encoding arbitrary bytes, so tools can differ in alphabet order or method. This tool uses the widely-used big-integer scheme (as Base58 does) with the alphabet 0–9, then A–Z, then a–z. Decode with the same convention it was encoded in.
Is Base62 encryption?
No — it is a reversible encoding with no secrecy; anyone can decode it. Encrypt the data first if you need confidentiality.
Is my text uploaded?
No — the encoding and decoding run entirely in your browser and nothing is transmitted. It works offline too.