Is my input uploaded anywhere?

No. Encoding and decoding run entirely in your browser via local JavaScript — nothing leaves your device.

How is Base32 different from Base64?

Base32 uses only the 32 characters A-Z and 2-7 and is case-insensitive, so it's harder to mis-type or mis-hear. It produces longer strings than Base64 (62 chars + symbols) but is preferred for TOTP / 2FA secret keys and case-insensitive environments.

Why does Base58 omit 0, O, I, and l?

The digit 0 vs capital O, and capital I vs lowercase l, are easy to confuse, so Base58 excludes them. It's used for cryptocurrency identifiers such as Bitcoin addresses and WIF private keys (and has no padding character).

What is the trailing = in Base32?

RFC 4648 padding. Base32 encodes in 5-bit units, so the output is padded with = to a multiple of 8 characters (40 bits = 5 bytes). Decoding ignores =, so input without padding still works.

When does decoding fail?

When the input contains characters not in the chosen alphabet — for example 0 / O / I / l in Base58, or 0 / 1 / 8 / 9 in Base32. Make sure the selected variant matches your input.

Why merge them into one tool?

Base32 and Base58 are the same operation (text ⇄ encoded string); a variant toggle and a direction toggle cover all four combinations in one UI. Base64 differs enough in alphabet and use to stay a separate tool.

Back to Developer

Base32 / Base58 encode & decode

Convert text to and from Base32 (RFC 4648 / TOTP 2FA secrets) and Base58 (Bitcoin addresses). Switch the variant (Base32 / Base58) and direction (encode / decode). UTF-8 byte based, so Japanese and emoji round-trip. Runs entirely in your browser.

developerconversionencodedecode

How to use

Pick a variant (Base32 / Base58) and a direction (encode / decode), paste your text or encoded string, then press Run. Encoding works on the UTF-8 bytes of your input, so Japanese and emoji round-trip cleanly. Decoding shows an error if the input contains characters outside the chosen alphabet. Copy or download the result as .txt. Everything runs in your browser — nothing is uploaded.

FAQ

Is my input uploaded anywhere?: No. Encoding and decoding run entirely in your browser via local JavaScript — nothing leaves your device.
How is Base32 different from Base64?: Base32 uses only the 32 characters A-Z and 2-7 and is case-insensitive, so it's harder to mis-type or mis-hear. It produces longer strings than Base64 (62 chars + symbols) but is preferred for TOTP / 2FA secret keys and case-insensitive environments.
Why does Base58 omit 0, O, I, and l?: The digit 0 vs capital O, and capital I vs lowercase l, are easy to confuse, so Base58 excludes them. It's used for cryptocurrency identifiers such as Bitcoin addresses and WIF private keys (and has no padding character).
What is the trailing = in Base32?: RFC 4648 padding. Base32 encodes in 5-bit units, so the output is padded with = to a multiple of 8 characters (40 bits = 5 bytes). Decoding ignores =, so input without padding still works.
When does decoding fail?: When the input contains characters not in the chosen alphabet — for example 0 / O / I / l in Base58, or 0 / 1 / 8 / 9 in Base32. Make sure the selected variant matches your input.
Why merge them into one tool?: Base32 and Base58 are the same operation (text ⇄ encoded string); a variant toggle and a direction toggle cover all four combinations in one UI. Base64 differs enough in alphabet and use to stay a separate tool.

Related tools

Base64 encode / decode — URL-safe variant supported

Convert between plain text and Base64. Encode with an optional URL-safe variant; decoding accepts URL-safe (- _, no padding) automatically. UTF-8 safe and runs entirely in your browser.

developerencodedecode

Text ⇄ Binary Converter

Convert between text and binary. Pick a mode (text → binary or binary → text). Text is encoded to UTF-8 bytes and each byte is shown as a zero-padded 8-bit binary number (emoji and non-Latin text convert correctly as multiple bytes). Toggle space separators via an option; on decode, spaces and newlines are ignored and the input is regrouped into 8-bit bytes. Everything runs in your browser — your input is never uploaded.

developerconversionencodedecode

Morse Code Translator

Translate between text and Morse code. Pick a mode (text → Morse or Morse → text) and a character set: international (ITU: A-Z / 0-9 / punctuation) or Japanese wabun code (katakana with dakuten / handakuten / long vowel). Symbols are separated by a space and words by ' / '. Japanese voiced marks are split and recomposed via Unicode normalization (NFD/NFC). Everything runs in your browser — your text is never uploaded.

developerconversionencodedecode

Caesar Cipher / ROT13

Encode and decode the Caesar cipher. Pick a mode (encrypt / decrypt) and set the shift (1–25) with a slider or number field. One tap sets ROT13 (shift 13). Only A-Z / a-z are rotated; digits, punctuation, spaces, and non-Latin text are left intact. In decrypt mode, a full 25-shift brute-force table is shown to crack ciphertext with an unknown shift. Everything runs in your browser — your input is never uploaded.

developerencodedecode