SLIP‑39 ⇄ Base64 (Offline, Raw Base‑1024 Mapping)

No network needed. Works entirely in your browser. This performs a raw reversible mapping between SLIP‑39 words and bytes (10‑bits per word) using the English SLIP‑39 1024‑word list you supply. It does not validate or produce SLIP‑39 checksums or group metadata.

1) Load SLIP‑39 English wordlist (1024 words)

Paste the official SLIP‑39 English list here, one word per line, in correct order (indices 0..1023). Required.

No list loaded

Tip: Keep a verified copy of the list offline. This app never sends data anywhere.

Settings

force lowercase words
normalize whitespace (spaces/newlines/tabs)

Note: Without SLIP‑39 checksum logic, not every bytes→words conversion represents a valid share phrase. This tool focuses on reversible mapping only.

2) SLIP‑39 mnemonic → Base64

Idle

Base64

Hex

Words:

0

Bytes:

0

Bits:

0

3) Base64 → SLIP‑39 mnemonic

Idle

Words:

0

Bytes:

0

Bits:

0

Important

This tool is a raw base‑1024 mapper. It does not validate SLIP‑39 checksums, iteration exponents, identifiers, or group/threshold metadata.
Converting bytes → words here may yield phrases that are not valid SLIP‑39 mnemonics. Likewise, converting words → bytes does not confirm share integrity.
Handle secrets carefully. Use an offline machine and clear your clipboard after use.