Base58 Encoder / Decoder

Base58 encodes binary data using 58 characters. It takes the digits and letters but removes the easily confused 0 (zero), O (capital o), I (capital i) and l (lowercase L), plus the symbols (+ / = etc.) that break in URLs and plain text, leaving 123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz. Unlike Base64, which splits data by fixed bit groups, Base58 treats the whole input as one large integer and converts it to base 58.

The classic examples are Bitcoin addresses and private keys (WIF), and IPFS content identifiers (CIDv0). It suits identifiers that people copy or read aloud where misreads must be avoided. Real Bitcoin addresses actually use Base58Check, which appends a 4-byte checksum (this tool does plain Base58).

In Base58, each leading 0x00 byte becomes one leading "1" character in the output. This preserves leading zeros that would otherwise be lost when the data is treated as an integer, and this tool follows the same rule so the round trip (encode then decode) is exact.

Both represent binary data as text. Base64 is more compact but includes the symbols + / = and easily confused characters. Base58 drops the ambiguous 0, O, I and l plus all symbols, keeping only 58 characters, so it is safe to read aloud, retype, or double-click select without breaking. It is used for Bitcoin addresses and IPFS CIDs.

No. Encoding, decoding and downloading all run entirely in your browser. Your input is never sent to any server.

Yes. The character ordering matches the standard Base58 alphabet used by Bitcoin. Note this is plain Base58, not Base58Check, which appends a 4-byte checksum.