About PureMark

PureMark is a suite of free, browser-based developer tools. Every tool runs entirely in your browser — no installs, no logins, no server uploads. Your data never leaves your device.

Our Principles

• 01
  Zero friction

  Open the URL and start working. No install, no signup, no credit card.

• 02
  Privacy by default

  All processing happens in your browser. We never see your data.

• 03
  Do one thing right

  Each tool focuses on a single task and does it exceptionally well.

Tools

• PureMark Annotate

  Image annotation tool. Add arrows, text, shapes, and auto face mosaic to screenshots.

  annotate.puremark.app →
• PureMark JSON Formatter

  Zero-click JSON formatter. Copy JSON, open the tab — auto-formatted instantly.

  json.puremark.app →

More tools coming soon: Base64, URL Encoder, Diff Checker, and more.

Built by

PureMark is an indie project built and maintained by a solo developer. Follow the journey on X / Twitter (@tommy_worklab).

Tech Stack

React, TypeScript, Vite, Tailwind CSS, PWA. Hosted on Cloudflare Pages (free tier). No backend servers.