Choose the receiving alphabet
Start with the format required by the receiving system, not with the name that sounds most compact. Base64 uses letters, digits, plus and slash in its standard form; some contexts instead specify the URL-safe Base64 variant. Base32 uses capital letters and digits 2 through 7. Bitcoin-style Base58 excludes characters such as zero, capital O, capital I and lowercase l that are easy to confuse when copied by hand. Different alphabets can represent the same bytes, but a receiver expecting one will not automatically recognize another. None of the three encrypts a message. Their purpose is representation, so anyone with the right decoder can recover the original bytes.
Follow one small example
Take the ASCII text Man, whose UTF-8 bytes are hexadecimal 4D 61 6E. Standard Base64 writes these bytes as TWFu. RFC 4648 Base32 writes them as JVQW4===, including padding to complete its eight-character block. The linked Base58 tool represents the same bytes using the Bitcoin alphabet and no equals padding. The results look different because the alphabets divide the bit stream or integer value differently; the text has not changed. Enter Man in the embedded Base32 encoder, then use its matching decoder. Try the Base64 and Base58 tools with exactly the same input and compare the outputs only after decoding them back to bytes.
- UTF-8: Man → 4D 61 6E
- Base64: TWFu · Base32: JVQW4===
- Base58: a different alphabet; decode back to Man
Padding, variants and checksum
Base64 and Base32 specifications discuss padding with equals signs. Some applications deliberately omit padding, and a receiver may require either padded or unpadded text; match its contract exactly. Base58 has no equals padding in this implementation. Also distinguish plain Base58 encoding from Bitcoin Base58Check: a Bitcoin address includes version information and a checksum before its Base58 rendering. The MultiVerto Base58 converter encodes UTF-8 text and does not construct a Bitcoin address or validate a Base58Check checksum. Likewise, switching standard Base64 to Base64URL changes alphabet details that matter in URLs. A token with the wrong variant can fail even though its underlying bytes are otherwise correct.
Check bytes before comparing strings
Text first becomes bytes under a character encoding. MultiVerto uses UTF-8 for its Base32 and Base58 text tools, so a letter with an accent may occupy more than one byte. Count bytes rather than visible characters when estimating size. Whitespace copied into the source may also change the result. To diagnose a mismatch, record the original text, its UTF-8 bytes, the named alphabet, padding policy and expected decoder. Decode the candidate output and compare the reconstructed text. If your actual workflow transports arbitrary binary files instead of UTF-8 text, verify that the receiving tool preserves raw bytes; a text-only converter is not a general binary-file protocol.
Use the representation the contract names
For a MIME field, API token, QR payload or handwritten identifier, read the relevant specification before choosing an alphabet. Base64 is common in machine-oriented interchange; Base32 can suit case-insensitive or restricted alphabets; Base58 is associated with human transcription in certain systems. Those are tendencies rather than guarantees. Do not assume that encoding adds integrity or authenticity: a string can be altered unless the surrounding format supplies a checksum, signature or authenticated protection. Keep a short test vector such as Man with your integration, and verify both encoding and decoding at the boundary where the data leaves your application. The deciding question is whether the receiver accepts the exact characters and rules you emit.