StringMash launches with 308 free text converters

StringMash, an independent site of free converters for text, launches today at stringmash.com with 308 tools. It covers old alphabets like runes, Ogham, Morse and tap code, classic ciphers such as Caesar, Vigenère and Playfair, developer encodings like Base64 and JWT, fancy text for social media, and math tools that draw out their working. There are no accounts and nothing to install.

Every conversion runs in the reader's browser. Nothing typed into a converter is sent to a server, saved or logged.

Plenty of sites say they don't keep what you type. StringMash checks it. Before any change goes live, an automated test types a marker string into every converter on the site and confirms it never appears in a network request.

"People paste things into converters that they wouldn't post anywhere," said Rory Hansen, who built StringMash and edits every page. "A password hint, a JWT from work, a note in a cipher. The only honest way to look after that is never to receive it."

Every converter has a page of its own explaining how the conversion works, usually with a printable chart. The long division worksheet is drawn out the way it's written on paper. The subnet calculator shows the binary, and the sorting pages animate every comparison.

Technical tools follow the standards that define them. Morse follows ITU-R M.1677-1, resistor colors follow IEC 60062, and UUIDs, JWTs and IP addresses follow their RFCs. Each page lists the sources it was checked against.

The 308 converters are grouped into 13 topic pages, alongside 94 articles on the history behind them.

StringMash Daily sets a new cipher puzzle every day, easy on Monday and hardest on Sunday. The math worksheet generator prints sheets with an answer key for times tables, long division, regrouping and fractions. There are printables for kids, a geocaching puzzle solver and a Christmas section. Twelve converters and the daily puzzle can be embedded on other sites with one iframe.

StringMash opened quietly on September 20, 2026 with 23 converters. Everything added since is logged on What's new.

StringMash is an independent site of over 300 free converters and tools for text: runes, Morse, classic ciphers, Base64, math worksheets and more. Every conversion runs in the reader's browser, and nothing typed is sent to a server. More about StringMash.

Rory Hansen, hello@stringmash.com