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cryptii Alphabetical Substitution

Encodes and decodes with a custom alphabet substitution.

Artifact by cryptii

IndexedMITSecurity & privacyNo sign-upRuns in your browser

Use it

Opens cryptii.com in a new tab. Nothing to install.

You provide
Text or code pasted into a box
You get
Encoded or decoded text on the page
Account
No sign-up needed
AI
No AI: a plain tool
Your input
Processed in your browser, not uploaded (stated by the tool or its repo)
Price
Free to use
Made with
Open-source web app
Source
Open source
Link check
Answered on Oct 31, 2026

About

cryptii Alphabetical Substitution is an open-source web app in the security privacy category (cipher). It opens in your browser, so there is nothing to install. You provide text or code pasted into a box and get encoded or decoded text on the page. Your input is processed on your device and not uploaded. It needs no account. It is a plain tool: no AI model is involved. The source code is public on GitHub (cryptii/cryptii).

Category: Security & privacy · cipher

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Details

Auth
No auth
License
MIT
First seen
Oct 31, 2026
Last checked
Oct 31, 2026
Source
GitHub

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Cite this page

cryptii Alphabetical Substitution: free online tool. Agent Mart. https://agentmart.dev/artifacts/cryptii-alphabetical-substitution (last updated 2026-10-31)