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Privacy-first developer utilities

47 powerful browser-based tools for encoding, formatting, and data transformation. All processing runs client-side — your data never leaves your browser.

Get startedBrowse tools
No data transmission
Works offline
Open source

Quick start

Get started with Kayston’s Forge in three simple steps

1

Visit the app

Navigate to Kayston’s Forge in your browser. The app is a fully static site that loads instantly and works offline once cached.
Kayston’s Forge is a PWA (Progressive Web App). You can install it to your device for quick access from your dock or home screen.
2

Choose a tool

Browse the 47 available tools organized across 7 categories:
  • Encoding & Encryption — Base64, JWT, URL encoding, Unix timestamps, certificates
  • Escaping & Entities — HTML entities, backslash escaping, UUID/ULID generation
  • Format Converters — YAML ↔ JSON, number bases, color formats, cURL to code
  • Code Beautifiers — HTML, CSS, JS, XML, and more
  • Generators — QR codes, random strings, Lorem Ipsum
  • Data Transformers — CSV ↔ JSON, hash generation, SQL formatting, list operations
  • Preview & Comparison — HTML preview, text diff
Use the command palette (Cmd/Ctrl+K) to quickly search and switch between tools.
3

Start processing

Paste your input, select an action (e.g., Encode, Decode, Beautify, Minify), and execute with Cmd/Ctrl+Enter. Your data is processed instantly in your browser.
Example: JSON formatting
{"name":"John","age":30,"city":"New York"}

{
  "name": "John",
  "age": 30,
  "city": "New York"
}
Your tool history is saved locally in IndexedDB. Revisit previous inputs and outputs anytime from the history panel.

Explore by category

Discover tools organized by use case

Encoding & encryption

Base64, JWT debugging, URL encoding, Unix time conversion, and X.509 certificate decoding

Format converters

Convert between YAML, JSON, CSV, number bases, color formats, and more

Code beautifiers

Format and minify HTML, CSS, JavaScript, XML, SCSS, LESS, and ERB templates

Data transformation

Transform CSV, JSON, generate SQL, compare lists, sort lines, and format code

Generators

Generate QR codes, UUIDs, ULIDs, random strings, and Lorem Ipsum placeholder text

Preview & comparison

Safely preview HTML and compare text with unified or split diff views

Key features

Built for speed, privacy, and developer productivity

Privacy-first

All processing runs client-side in your browser. Your data never leaves your device — no servers, no tracking, no cloud storage.

Keyboard-first

Command palette, extensive keyboard shortcuts, and fast navigation. Execute tools with Cmd/Ctrl+Enter, copy output, and switch tools without touching your mouse.

Works offline

Installable PWA with service worker caching. Access all 51 tools offline, on the go, or in restricted network environments.

Local history

Tool history stored in IndexedDB. Revisit previous inputs and outputs, star favorites, and restore sessions — all stored locally on your device.

Resources

Learn more about Kayston’s Forge

Keyboard shortcuts

Master the keyboard shortcuts

Architecture

Explore the technical architecture

Contributing

Set up a local development environment

Ready to get started?

Open Kayston’s Forge in your browser and start using 47 privacy-first developer tools instantly

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