LogoPractical Web Tools

Free Forever

All our tools are completely free to use. No account required, No hidden fees and No subscriptions.

Fast & Secure

All processing happens in your browser. Your files never leave your device.

No File Size Limits

Convert files of any size. No restrictions on file sizes or number of conversions.

Batch Processing

Convert multiple files at once to save time and effort.

File Converters

  • PDF Tools
  • Image Converter
  • Video Converter
  • Audio Converter
  • Document Converter
  • eBook Converter
  • Archive Tools
  • File Tools

Calculators

  • Finance Calculators
  • Health Calculators
  • Math Calculators
  • Science Calculators
  • Other Tools

Popular Tools

  • PDF to Word
  • HEIC to JPG
  • Merge PDF
  • Fillable PDF Creator
  • Mortgage Calculator
  • BMI Calculator
  • AI Chat

Company

  • About Us
  • Blog
  • Contact
  • Request a Tool

Legal

  • Privacy Policy
  • Terms of Service
Email Support
Practical Web Tools Logo
Practical Web Tools

Free Tools — Your Files Never Leave Your Device

Practical Web Tools - Convert files & chat with AI — fully offline | Product Hunt

© 2026 Opal Emporium LLC. All rights reserved.

Privacy-first file conversion and AI chat. No accounts, no uploads, no tracking.

Developer ToolsIn Your Browser

28 powerful tools for coding, diagrams, data formatting, and more. No installation, no sign-up, 100% client-side.

Try Python EditorCreate Diagrams

Code Runners(13 tools)

Execute Python, TypeScript, SQL, and 10+ more languages directly in your browser.

PythonTypeScriptJavaScriptSQL+9 more
Explore tools

Diagram Tools(4 tools)

Create flowcharts, sequence diagrams, graphs, and data visualizations.

MermaidD2GraphVizGnuPlot
Explore tools

Data Tools(3 tools)

Format, validate, and edit JSON, YAML, and Markdown with live preview.

JSON EditorYAML EditorMarkdown Editor
Explore tools

Comparison Tools(5 tools)

Compare code, text, JSON, YAML, and data files side-by-side.

Code CompareText CompareJSON CompareYAML Compare+1 more
Explore tools

Web Dev Tools(2 tools)

HTML/CSS/JS playground and email template editors.

HTML/CSS/JS PlaygroundMJML Email Editor
Explore tools

Cron Generator(1 tools)

Build and validate cron expressions with a visual interface.

Cron Generator
Explore tools

Why Use Our Developer Tools?

No Installation

Everything runs in your browser. No downloads, no setup.

100% Private

All processing happens locally. Your code never leaves your device.

Shareable Links

Share your code with anyone via URL. No accounts needed.

Always Free

All tools are completely free with no hidden limits.

Quick Answer

Our Developer Tools suite provides 28+ free online tools including code runners for 13+ languages (Python, TypeScript, SQL, Go, Ruby, Java), diagram generators (Mermaid, GraphViz, D2), data formatters (JSON, YAML, Markdown), and comparison utilities. All tools run directly in your browser with no installation required.

How It Works

1

Choose a tool category based on your development needs

2

Select the specific tool or language you want to use

3

Write or paste your code, data, or diagram definition

4

Run, format, or preview your content instantly

5

Share via URL or download your results

Key Facts

  • Execute code in 13+ languages including Python, TypeScript, SQL, and Java
  • Create diagrams with Mermaid, D2, GraphViz, and GnuPlot
  • Format and validate JSON, YAML, and Markdown
  • Compare code, text, and data files side-by-side
  • All processing happens in your browser - 100% private
  • No registration, installation, or sign-up required

Frequently Asked Questions

Are these developer tools really free?

Yes, all our developer tools are completely free with no hidden costs or limitations. No registration is required.

Is my code kept private?

Yes, all code execution and processing happens locally in your browser using WebAssembly. Your code never leaves your device.

Which programming languages are supported?

We support 13+ languages including Python, TypeScript, JavaScript, SQL, PostgreSQL, Go, Ruby, Java, C++, C#, PHP, Lua, Julia, and R.

Can I share my code with others?

Yes, most tools support shareable URLs that encode your code. Share the link with anyone to let them view and run your code.