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Developer Tools
Built for Speed

200+ free online tools for developers. Format, convert, generate, and transform your data instantly.

200+
Free Tools
11
Categories
0
Sign-ups Needed

100% Secure & Private🔒

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

No Server Uploads
No Data Storage
Works Offline
💻

Developer Tools

30 tools

Internet Speed Test

Test your internet connection speed. Measure download, upload speeds, and latency.

Developer Tools

Online Notepad

Simple browser-based notes with auto-save.

Developer Tools

Code Snippet Share

Share code snippets with syntax highlighting using a simple, shareable link.

Developer Tools

JSON Share

Share JSON data with others using a simple, shareable link.

Developer Tools

JSON Formatter

Format and beautify JSON data. Pretty print JSON with syntax highlighting.

Developer Tools

JSON Compare

Compare two JSON objects and find differences. Visual JSON diff tool.

Developer Tools

JSON Validator

Validate JSON syntax and format. Check if JSON is valid and get formatted output.

Developer Tools

Epoch Converter

Convert Unix timestamps to dates.

Developer Tools

XML Formatter

Pretty-print, validate, and minify XML.

Developer Tools

SQL Formatter

Beautify and format SQL queries.

Developer Tools

CSV to JSON

Convert CSV data to JSON format.

Developer Tools

JSON to CSV

Turn JSON data into CSV or Excel format.

Developer Tools

CSV to Excel

Convert CSV files to Excel format.

Developer Tools

Excel to CSV

Convert Excel files to CSV format.

Developer Tools

YAML to JSON

Convert YAML to JSON format.

Developer Tools

YAML Formatter

Format and beautify YAML code with proper indentation.

Developer Tools

JSON to XML

Convert JSON data to XML format.

Developer Tools

XML to JSON

Convert XML data to JSON format.

Developer Tools

Mock Data Generator

Generate mock JSON/CSV data for testing.

Developer Tools

Cron Builder

Build, parse, and translate cron expressions.

Developer Tools

Regex Tester

Test and debug regular expressions with real-time matching.

Developer Tools

Code Minifier

Minify JavaScript, CSS, and HTML code.

Developer Tools

Code Beautifier

Format and beautify HTML, CSS, JS code.

Developer Tools

JavaScript Obfuscator

Obfuscate JavaScript code to protect your source code.

Developer Tools

JSON to Kotlin Data Class

Convert JSON to Kotlin data classes with support for Gson, Moshi, and kotlinx.serialization.

Developer Tools

Text Diff

Compare two pieces of text and find differences.

Developer Tools

String Case Converter

Convert between snake_case, camelCase, kebab-case.

Developer Tools

Lorem Ipsum Generator

Generate placeholder text for designs.

Developer Tools

API Tester

Test REST API endpoints.

Developer Tools

Mock APIs

Ready-made mock APIs for testing.

Developer Tools
🔐

Encoding & Security

10 tools
🌐

SEO & Network

15 tools
🎨

UI & Design

12 tools
📦

AI Career Tools

1 tools
📄

PDF Tools

27 tools
🖼️

Image Tools

17 tools
🤖

Utilities

20 tools
📝

Document Generators

20 tools

Resume Generator

Create professional resumes.

Document Generators

Invoice Generator

Generate professional invoices.

Document Generators

GST Bill Generator

Generate GST compliant bills.

Document Generators

Salary Slip Generator

Generate employee salary slips.

Document Generators

Rent Receipt Generator

Generate rent payment receipts.

Document Generators

Fee Receipt Generator

Generate fee payment receipts.

Document Generators

Experience Letter Generator

Generate work experience letters.

Document Generators

Relieving Letter Generator

Generate employee relieving letters.

Document Generators

Internship Certificate Generator

Generate internship certificates.

Document Generators

Award Certificate Generator

Generate award certificates.

Document Generators

ID Card Generator

Generate employee ID cards.

Document Generators

Electricity Bill Generator

Generate electricity bills.

Document Generators

Mobile Bill Generator

Generate mobile phone bills.

Document Generators

Broadband Bill Generator

Generate broadband internet bills.

Document Generators

Maintenance Bill Generator

Generate apartment maintenance bills.

Document Generators

Medical Prescription Generator

Generate medical prescriptions.

Document Generators

Hotel Booking Generator

Generate hotel booking confirmations.

Document Generators

Flight Ticket Generator

Generate flight ticket confirmations.

Document Generators

Movie Ticket Generator

Generate movie tickets.

Document Generators

Gym Membership Generator

Generate gym membership cards.

Document Generators
🎭

Fake Generators

13 tools

Fake ChatGPT Chat Generator

Create fake ChatGPT conversation screenshots for parody and entertainment. Customize messages, add images, and create realistic ChatGPT-style conversations.

Fake Generators

Fake WhatsApp Chat

Create fake WhatsApp conversations.

Fake Generators

Fake Tweet

Create fake Twitter/X posts.

Fake Generators

Fake Instagram DM

Create fake Instagram messages.

Fake Generators

Fake Facebook Chat

Create fake Facebook conversations.

Fake Generators

Fake Boarding Pass

Create fake boarding passes.

Fake Generators

Newspaper Clipping Generator

Create custom newspaper clippings with your own headlines and stories. Generate authentic-looking newspaper layouts.

Fake Generators

Restaurant Receipt Generator

Generate fictional restaurant receipts with humorous menu items for UI/UX design demos.

Fake Generators

Fake Grocery Bill Generator

Generate playful, cartoon-style grocery bill templates with fictional items for UI/UX design demos.

Fake Generators

Google Suggestion Generator

Create fake Google search suggestions for parody and entertainment. Customize your own search suggestions with Google-style interface.

Fake Generators

Breaking News Generator

Generate breaking news broadcasts with custom headlines and tickers. 100% FREE online tool.

Fake Generators

Poll Result Generator

Generate hilarious poll results with exaggerated percentages and fun animations. All questions and results are fictional.

Fake Generators

Fake Notification Prank Generator

Generate hilarious fake notifications with funny messages for visual pranks. All senders and content are fictional. Perfect for harmless pranks and entertainment.

Fake Generators
💰

Finance

13 tools

About GeeksPrep Tools

GeeksPrep Tools is a comprehensive collection of 200+ free online developer tools designed to help developers, designers, and professionals work more efficiently. All our tools are 100% free, require no registration, and process data entirely in your browser for maximum privacy and security.

💻

Developer-Focused

From JSON formatting and code beautification to API testing and data conversion, our developer tools cover every aspect of modern software development. Whether you're working with APIs, processing data, or formatting code, we have the tools you need.

🔒

100% Private & Secure

All processing happens entirely in your browser. Your files, data, and information never leave your device—they're not uploaded to servers, stored in databases, or transmitted over the network. Complete privacy guaranteed.

Lightning Fast

Since all processing happens locally in your browser, you get instant results without waiting for server uploads, network transfers, or external processing. Most operations complete in milliseconds.

🌐

Works Everywhere

Browser-based tools work on any device with a web browser—Windows, Mac, Linux, iOS, Android. No software installation required. Most tools even work offline after the initial page load.

How It Works

1

Choose Your Tool

Browse our collection of 200+ free tools organized into 11 categories, or use the search bar to find a specific tool. From JSON formatters to PDF converters, we have tools for every need.

2

Use Instantly

No registration required. Just open the tool and start using it immediately. All tools are ready to use right away—no sign-up, no login, no account creation needed.

3

100% Private

All processing happens in your browser. Your data never leaves your device—no uploads, no storage, no tracking. Complete privacy and security guaranteed.

Frequently Asked Questions

Are these tools really free?

Yes, all our tools are 100% free with no hidden costs, no subscriptions, and no premium tiers. You can use all 200+ tools without any payment or registration. We believe in providing free, accessible tools for everyone.

🔐Do I need to register or create an account?

No, you can use all tools without any registration or account creation. Just open the tool and start using it immediately. No sign-up required, no email needed, no personal information collected.

🛡️Is my data secure and private?

Yes, absolutely. All processing happens entirely in your browser using client-side JavaScript. Your files, data, and information never leave your device—they're not uploaded to servers, stored in databases, or transmitted over the network. Complete privacy guaranteed.

📱Can I use these tools offline?

Most tools work offline after the initial page load, as all processing happens in your browser. Once the page is loaded, you can use most tools without an internet connection, making them perfect for work in remote locations or areas with unreliable connectivity.

🛠️What types of tools are available?

We offer 200+ tools across 11 categories including Developer Tools (JSON, CSV, code formatting), PDF Tools (merge, split, convert), Image Tools, Document Generators (resumes, invoices), AI Career Tools (ATS resume checker), Finance Calculators, Encoding & Security tools, SEO & Network tools, and more.

📊Are there any file size limits?

No, there are no file size limits. Our browser-based tools can handle files of any size, limited only by your device's memory. This is especially valuable when working with large JSON files, extensive codebases, or massive datasets.

🔍Do you store or track my usage?

No, we don't store, track, or log any of your usage. All tools work anonymously without any tracking, analytics, or data collection. Your privacy is guaranteed. No cookies, no tracking pixels, no data collection.

💼Can I use these tools for commercial purposes?

Yes, all tools are free to use for both personal and commercial purposes. There are no restrictions on usage. Use them for your business, projects, or any purpose you need.

🛠️ GeeksPrep Tools

A collection of 200+ free online developer tools. No registration, no ads, just tools that work. Built with ❤️ for developers.

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© 2025-2026 GeeksPrep. All tools are free to use.
Feel free to reach out for suggestions or opportunities: contact@geeksprep.com