Custom Base64 Alphabet Mapper

How custom Base mapping works

• Alphabet: choose any 64 unique characters as the Base64 alphabet (standard is A–Z, a–z, 0–9, +, /).
• Remapping: this tool remaps characters from the source alphabet to the target alphabet 1‑to‑1, without re‑encoding the payload.
• Padding: = can be kept, changed to another symbol, or removed entirely; both sides must agree.
• Compatibility: custom alphabets are not interoperable with standard Base64 unless the receiver knows your alphabet and padding rules.
• Safety: this is a textual substitution layer over Base64; it does not add encryption or integrity by itself.