Free Online Tools & Calculators
Welcome to Online Tool Hub
Free online tools for documents, images, developer utilities, time, finance, home, vehicles, food, and more.
Featured tools
Hand-picked utilities to get you started
AI Prompt Creator
Build high-quality AI prompts from templates, score them, and improve structure in your browser.
Open toolMerge PDF
Combine multiple PDF files into one document.
Open toolResize Image
Resize images to exact dimensions or percentages.
Open toolAge Calculator
Calculate exact age in years, months, and days.
Open toolMortgage Calculator
Estimate monthly payments and amortization.
Open toolPaint Calculator
Estimate gallons of paint needed for your project.
Open toolVIN Decoder
Decode any 17-character VIN using NHTSA data.
Open toolNutrition Lookup
Search USDA food database for nutrient data.
Open toolWheel Spinner
Spin a wheel to pick a random name or option.
Open toolWeekly Planner
Seven-day schedule with priorities and notes.
Open toolInvoice
Professional invoice with line items and totals.
Open toolQuiz Builder
Generate custom trivia by category and difficulty.
Open toolBrowse by category
Every toolkit, organized in one hub
Document Toolkit
PDF tools, file conversions, and text utilities that run in your browser.
Developer Toolkit
Prompt builders and utilities for developers and power users.
Image Tools
Resize, convert, compress, and edit images locally — nothing uploaded to a server.
Time Toolkit
Age calculators, date math, timers, time zones, and calendar utilities.
Finance Toolkit
Mortgage, salary, investment, retirement, and debt calculators.
Homeowner Toolkit
Material estimators and calculators for paint, concrete, roofing, and renovations.
Vehicle Toolkit
VIN decoding, recalls, fuel economy, tires, and automotive calculators.
Nutrition Toolkit
Food lookup, macro calculators, barcode scanning, and nutrition education.
Randomizer Toolkit
Wheels, dice, name pickers, and decision makers for games and raffles.
Printable Generator
Customizable planners, calendars, worksheets, and PDF templates.
Trivia Generator
Create, host, and print professional trivia in seconds.
Popular tools
Most-used calculators and utilities
Split PDF
Extract page ranges into separate PDF files.
Open toolCompress PDF
Reduce PDF file size.
Open toolWord to PDF
Convert Word documents to PDF.
Open toolJSON Formatter
Format and validate JSON data.
Open toolPassport Photo Creator
Crop photos to US, UK, EU, and other passport sizes.
Open toolHEIC to JPG
Convert iPhone HEIC photos to JPG.
Open toolRecently added
New tools across the platform
AI Prompt Creator
Build high-quality AI prompts from templates, score them, and improve structure in your browser.
Open toolUnlock PDF
Remove password protection from a PDF.
Open toolProtect PDF
Add password protection to a PDF.
Open toolFlatten PDF
Rasterize pages so forms and annotations are fixed.
Open toolRedact PDF
Cover sensitive phrases with black redaction boxes.
Open toolSign PDF
Add a typed or image signature to the last page.
Open toolOne hub. Hundreds of free tools.
Online Tool Hub brings together document tools, image editors, time calculators, finance planners, homeowner estimators, vehicle lookups, nutrition utilities, randomizers, printables, and trivia generators. Most tools run entirely in your browser — fast, private, and free. Learn more about us.
Frequently asked questions
Common questions about Online Tool Hub
- What is Online Tool Hub?
- Online Tool Hub is a free website that brings together hundreds of online tools in one place — including PDF utilities, image editors, time calculators, finance planners, homeowner estimators, vehicle lookups, nutrition tools, randomizers, printables, and trivia generators. No account is required.
- Are the tools on Online Tool Hub really free?
- Yes. Every tool on Online Tool Hub is free to use. The site is supported by advertising. There are no subscriptions or paywalls for standard tool usage.
- Do I need to create an account?
- No. Online Tool Hub does not require sign-up, registration, or login to use its calculators, converters, and utilities.
- Are my files uploaded to a server?
- Most tools — including PDF editing, image conversion, and calculators — process data locally in your browser. Your files stay on your device. Server-side processing is only used when necessary, such as API-based lookups for vehicle or nutrition data.
- What types of tools are available?
- Online Tool Hub includes document and PDF tools, image resizing and conversion, date and time calculators, finance and mortgage calculators, home improvement material estimators, VIN decoders and vehicle utilities, nutrition and macro calculators, random name pickers and wheels, printable planners and worksheets, and trivia generators.
- Can I use Online Tool Hub on mobile?
- Yes. Online Tool Hub is designed to work on phones, tablets, and desktop browsers. Most tools are responsive and touch-friendly.
- Is the information from calculators professional advice?
- No. Calculator results are estimates for informational purposes only. Online Tool Hub does not provide legal, tax, financial, medical, engineering, or construction advice. Always verify important decisions with qualified professionals.
- How often are new tools added?
- Online Tool Hub is actively expanded with new calculators, converters, and utilities across all categories. Recently added tools are highlighted on the homepage.