Spoold is a free, privacy-first developer toolbox that automatically detects what you paste (JSON, HTML, JWT, curl, etc.) and suggests the right tool. No sign-up required.

Is Spoold free to use?

Yes, Spoold is completely free to use. All tools work client-side in your browser with no data sent to servers.

Is my data safe with Spoold?

Absolutely. All processing happens in your browser. We don't store or transmit your data. Shared links use client-side encryption.

What tools are available?

Spoold includes JSON formatter, JSON diff, HTML preview, JWT decoder, time converter, CSV viewer, URL inspector, QR code generator/scanner, regex tester, Markdown preview, and curl converter.

Can I use keyboard shortcuts?

Yes! Press Cmd/Ctrl+K to search, or use shortcuts like 'jj' for JSON, 'hh' for HTML, 'tt' for Time converter, and more.

Spoold

Paste. Detect. Do.

Blog & Tutorials

Learn how to use our tools effectively. Tutorials, tips, and guides to help you work faster and smarter.

FeaturedLatest Post

Magic Box: Intelligent Content Detection That Learns Your Workflow

Discover how Magic Box instantly detects JSON, HTML, curl, JWT, CSV, regex, and 20+ formats. Learn how it adapts to your patterns and suggests workflows to accelerate your development.

January 10, 2026

7 min read

Feature

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Tutorial

9 min

UUID Generator: Complete Guide to Generating and Using UUIDs

Learn what UUIDs are, when to use v4, v1, v7, or nil, and how to generate, validate, and export UUIDs with our free UUID Generator tool. Best practices and common pitfalls.

January 8, 2026

Tutorial

5 min

SQL & GraphQL Editor: Query Database and APIs

Write and test SQL queries and GraphQL operations with syntax highlighting. Perfect for database management, API testing, and data analysis.

January 8, 2026

Tutorial

6 min

Go, Rust & Java Code Editor: Systems Programming Languages

Edit Go, Rust, and Java code with full syntax highlighting. Perfect for systems programming, backend development, and high-performance applications.

January 7, 2026

Tutorial

8 min

Create Mermaid Diagrams: Flowcharts, Sequence Diagrams & More

Generate beautiful diagrams with Mermaid syntax. Create flowcharts, sequence diagrams, class diagrams, Gantt charts, and more. Free online diagram maker.

January 6, 2026

Tutorial

8 min

Online Code Editor: Write Code in 40+ Programming Languages

Edit and run code in 40+ languages with Monaco (VS Code engine), syntax highlighting, format, and run JS/Python in the browser. Free, private, no install.

January 5, 2026

Tutorial

5 min

Python Code Editor Online: Write and Run Python in Your Browser

Edit and execute Python code directly in your browser. No installation required. Syntax highlighting, auto-formatting, and instant execution with our free Python editor.

January 4, 2026

Tutorial

8 min

JavaScript & TypeScript Editor: Write Modern Web Code

Edit JavaScript and TypeScript in the browser with Monaco, syntax highlighting, and run support. No install—perfect for snippets, learning, and quick API or regex tests.

January 3, 2026

Tutorial

8 min

How to Format JSON Like a Pro: Complete Guide

Master JSON formatting with our comprehensive guide. Learn best practices, common pitfalls, and how to use the JSON Formatter tool effectively.

January 2, 2026

Security

8 min

How to Decode JWT Tokens Securely

Understand JWT structure, decode tokens safely, and inspect claims, expiry, and signatures. A complete guide with best practices and our free JWT Decoder tool.

January 1, 2026

Tutorial

8 min

Convert curl Commands to JavaScript: fetch vs axios

Turn curl commands into JavaScript fetch or axios code in one click. Parse headers, body, and auth—with examples, fetch vs axios comparison, and best practices.

December 30, 2025

Web Development

3 min

Preview HTML Without a Server: Live Rendering Guide

Test your HTML, CSS, and JavaScript instantly with our HTML Preview tool. No server setup required, perfect for quick prototyping.

December 28, 2025

Data

8 min

CSV to JSON Conversion: Complete Guide

Convert CSV to JSON with auto-delimiter detection, table view, and export to JSON, SQL, or Markdown. Best practices, common pitfalls, and how to use the CSV Viewer tool.

December 25, 2025

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