Autokey cipher

Client

Key stream continues with plaintext—classic pre-modern cipher demo.

About Autokey cipher

Autokey Vigenère using plaintext to extend the key. The interactive transform on this page runs in your browser tab—Toolcore does not need your paste for the core operation described above.

How to use this page

Paste or type in the main workspace, run the primary action from the toolbar, then copy or download the result. Use Load example when the page offers it, or URL prefill (?q= / ?qb=) so agents and tickets open the same input.

QNXEPK

Nearby workflows on Toolcore

  • Vigenère cipher — Encrypt or decrypt A–Z with a repeating keyword—classic polyalphabetic cipher locally. for the next text or markup step in your edit loop.
  • Beaufort cipher — Beaufort substitution cipher with repeating keyword. for the next text or markup step in your edit loop.
  • Playfair cipher — Classic Playfair digraph cipher with a keyword—reversible substitution in your browser. for the next text or markup step in your edit loop.
  • ROT13 & Caesar cipher — Rotate Latin letters A–Z and a–z: ROT13 (self-inverse) or Caesar shift 0–25—other characters unchanged, local only. for the next text or markup step in your edit loop.

Common use cases

  • Autokey cipher for quick local checks without uploading data.
  • Copy results into tickets, docs, or classroom notes.

Common mistakes to avoid

  • Unexpected input shape

    See the intro and how-to notes for accepted formats.

FAQ

Is processing local?

Yes—this runs entirely in your browser.

Agent prefill?

Use q or qb for the main text field when supported.

More tools

Related utilities you can open in another tab—mostly client-side.