Vigenère cipher

Client

Vigenère repeats a keyword across the message—enter plaintext and key; output stays A–Z.

About Vigenère cipher

Encrypt or decrypt A–Z with a repeating keyword—classic polyalphabetic cipher locally. 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.

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Nearby workflows on Toolcore

  • Affine cipher encoder — Map A–Z with (ax+b) mod 26—enter a,b coprime to 26 for a valid key. 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.
  • Rail fence cipher — Encode or decode zigzag rail fence transposition ciphers—configurable rails, in your browser. for the next text or markup step in your edit loop.
  • Atbash cipher — Encode or decode text with Atbash letter substitution (a↔z)—reversible, in your browser. for the next text or markup step in your edit loop.

Common use cases

  • Vigenère 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.