---
title: "About Prettify: Who Makes It and How It Works"
description: Prettify is a local-first viewer and editor for JSON, YAML, CSV,
  XML, and Markdown, made by Off Leash Labs. Free tier, and Pro as a one-time
  purchase.
url: https://prettify.tools/about
---

# About Prettify

Last updated: October 16, 2026

Prettify is a viewer and editor for structured data and documents. It opens JSON, JSONL, YAML, CSV, TSV, XML, RSS and Atom feeds, Mermaid, Markdown, MDX, HTML, and SVG in one tool. Off Leash Labs makes Prettify.

## What Prettify does

Prettify shows your data in the view that suits it: a tree, a table, a node diagram, a chart, a feed, or a rendered preview. You can search, edit, validate, and convert between JSON, YAML, CSV, and XML. Pro adds query engines (jq, SQL, and XPath), JSON Schema validation, diff, split view, and full document history.

Prettify runs in the browser at [prettify.tools](https://prettify.tools/) and as a native macOS desktop app. Windows and Linux builds are also available on the [download page](https://prettify.tools/download).

## Your data stays on your device

Prettify parses, edits, queries, and converts your documents on your own device. It does not upload a document to view or edit it. A document leaves your device only when you choose a feature that needs the network, for example a Pro short share link. The [privacy guide](https://prettify.tools/docs/privacy) lists every network request that Prettify makes, and the [privacy statement](https://prettify.tools/legal/privacy) is the full policy.

## How Prettify is paid for

The free tier has no time limit and no account. Prettify Pro is a one-time purchase of US$19.99. It gives lifetime access to every Pro feature and every future update. There is no subscription and there are no ads. Pro has a 30-day money-back guarantee. See [Prettify Pro](https://prettify.tools/docs/pro) for the full list of features.

## Who makes Prettify

Off Leash Labs builds and supports Prettify, and it operates the website and the desktop app. The [changelog](https://prettify.tools/changelog) lists every release and what changed in it.

## Learn more

- [Documentation](https://prettify.tools/docs): a guide for every feature
- [Getting started](https://prettify.tools/docs/getting-started): open your first document
- [Blog](https://prettify.tools/blog): notes on parsing, data formats, and how Prettify works
- [Contact](https://prettify.tools/contact): questions, bug reports, and refunds

## Structured data

```json
{
  "@context": "https://schema.org",
  "@type": "SoftwareApplication",
  "name": "Prettify",
  "url": "https://prettify.tools",
  "description": "Multi-format data viewer, editor, and query engine for JSON, YAML, CSV, XML, Mermaid, Markdown, MDX, HTML, and SVG",
  "applicationCategory": "DeveloperApplication",
  "operatingSystem": "Web, macOS, Windows, Linux",
  "offers": [
    {
      "@type": "Offer",
      "price": "0",
      "priceCurrency": "USD",
      "description": "Free tier with core features"
    },
    {
      "@type": "Offer",
      "price": "19.99",
      "priceCurrency": "USD",
      "description": "Pro: lifetime access to all features"
    }
  ],
  "publisher": {
    "@id": "https://prettify.tools/#organization"
  }
}
{
  "@context": "https://schema.org",
  "@type": "Organization",
  "@id": "https://prettify.tools/#organization",
  "name": "Prettify",
  "legalName": "Off Leash Labs",
  "url": "https://prettify.tools/",
  "logo": {
    "@type": "ImageObject",
    "url": "https://prettify.tools/icon-512.png",
    "width": 512,
    "height": 512
  },
  "contactPoint": {
    "@type": "ContactPoint",
    "contactType": "customer support",
    "email": "offleashlabs@gmail.com",
    "availableLanguage": "English"
  }
}
```