License Key Generator
Generate grouped serial and license keys with Crockford alphabet and optional CRC32 checksum group, plus verify existing keys in your browser.
Generate serial keys with a verifiable checksum
Software vendors often ship license keys as grouped alphanumeric strings. This generator follows the Crockford Base32 alphabet (digits and uppercase letters without I, L, O, or U) and can append a final checksum group derived from a CRC-32 of the preceding characters, matching the pattern used by many offline key tools.
Choose how many groups appear, how many characters each group contains, and the separator (commonly a hyphen). Toggle the checksum group to reserve the last segment for validation. Paste any key into the verifier to recompute the expected checksum and confirm whether the body groups are intact.
Related: CRC-32 Hash Generator, KSUID Generator.
Frequently Asked Questions
What alphabet is used?
0123456789ABCDEFGHJKMNPQRSTVWXYZ, Crockford Base32 without ambiguous letters.
How is the checksum group computed?
The tool CRC-32 hashes the body groups concatenated without separators, then encodes the digest in the same alphabet to fill the last group.
Are keys stored on your servers?
No. Generation and verification run entirely in your browser using the Web Crypto API for random bytes.
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