Formatting tools that respect your data

Why this exists

Structured data arrives minified, inconsistently indented, or subtly broken — from APIs, integration middleware, log pipelines, configuration management and, increasingly, from language models. Making it readable should take one paste and one click, and it should not require handing the document to somebody else's server first.

Most free tools in this category are advertising properties that happen to contain a text box. Several store what you paste. At least one publishes those saved documents to the open web by default. That is a poor trade for a task this simple.

How the privacy guarantee works

There is no server-side processing component. Every formatter, validator, converter and diff runs as JavaScript in your browser, inside a Web Worker so that large documents do not block the interface. The site is a set of static files; there is no application backend, no database, and no logging of document content, because there is nowhere for that content to go.

You do not have to take that on trust. Open your browser developer tools, switch to the Network tab, paste a document and run any tool. No request is made. Once a page has loaded, you can disconnect from the network entirely and the tool keeps working.

What is deliberately not here

• No advertising, and therefore no anti-adblock nags.
• No accounts, no sign-in, no saved documents, no share links.
• No analytics on document content, and no third-party trackers or pixels.
• No claims the tools cannot support. The XML validator checks well-formedness and says so, rather than implying schema validation it does not perform.

What comes next

XML was the first format supported. JSON, YAML, SQL, CSS, HTML and the converter matrix followed, alongside file and folder comparison. New utilities are added on the same principles: clear controls, honest descriptions of what each tool validates, accessible markup, and no upload.

Read the privacy notice for the precise scope, or browseall tools.