Convertir data between Base32, Base58, Base64, Base85, and Base91
Translate le même binary payload across différent base encodings utilisé par différent systèmes (Bitcoin, DNS, PDF, compact serialization).
- 1
Different communities use different base encodings: Base32 for DNS/TOTP, Base58 for Bitcoin addresses, Base64 for MIME/JSON, Base85 for IPv6/PDF, Base91 for compact binary. All represent the same bytes — converting is decode-to-bytes then re-encode.
- 2 Convertisseur de base numérique →
Enter the value, pick the source base and target base. The tool decodes to raw bytes and re-encodes in one step.
- 3 Encodeur Base58 →
For Bitcoin-style addresses specifically, use Base58 which omits ambiguous characters (0, O, I, l) to prevent transcription errors.
- 4 Encodeur Base32 →
For DNS labels or TOTP secrets, use Base32 which is case-insensitive and uses only A-Z and 2-7.
- 5
Always verify the round-trip: decode the converted output back to bytes and confirm it matches the original. Base58 and Base91 have no padding, so length mismatches are the most common silent error.
Questions fréquentes
- Which base encoding is most compact?
- Higher bases are more compact: Base91 uses ~1.23 chars/byte, Base85 ~1.25, Base64 ~1.33, Base58 ~1.37, Base32 ~1.6. Choose based on the target system's alphabet support, not just size.
- Why does Base58 reject some valid Base64 output?
- Base58 has a restricted alphabet (no 0, O, I, l, +, /). If your Base64 string contains those characters, you must decode to bytes first, then Base58-encode — you cannot directly reinterpret the text.