AI Tools
Prompt to Image
Describe any picture in words and get a real AI-generated image — free, no sign-up, no API key. Generation runs on the free Pollinations.ai service and usually takes 10–30 seconds.
Your generated image will appear here.
Creating your image… this can take up to 30 seconds.
Tip: detailed prompts give better results — mention the subject, setting, lighting and mood. A fresh random seed is used each time, so generating again gives a new variation.
Video Tools
Video to MP3
Turn any video file into an MP3 audio file. The whole conversion runs inside your browser with the FFmpeg engine — your video is never uploaded to a server.
One-time download: the first conversion downloads the FFmpeg converter engine (about 25–30 MB) into your browser. After that, conversions start right away. An internet connection is needed for that first download only.
Works with MP4, MOV, WebM, MKV and most other video formats. Shorter videos convert fastest — very large files (over ~200 MB) may be slow because everything happens on your device.
Text Tools
Word Counter
Count words, characters, sentences and paragraphs as you type, with reading time and keyword density.
Start typing and the most-used words will appear here with their density.
Text Tools
Case Converter
Convert text between UPPER CASE, lower case, Title Case, Sentence case, camelCase and more — instantly.
Passwords & Sharing
Password Generator
Create strong, random passwords with your browser's secure random generator. Nothing is sent anywhere.
Press Generate to create a password.
Passwords & Sharing
QR Code Generator
Turn any link or text into a scannable QR code, then download it as a PNG image for printing or sharing.
Everyday Tools
Unit Converter
Convert length, weight, temperature, time and data sizes — metric and imperial — with exact conversion factors.
Everyday Tools
Age Calculator
Find an exact age in years, months and days — plus total days lived and the countdown to the next birthday.
Everyday Tools
Percentage Calculator
Three everyday percentage questions, answered instantly as you type.
Everyday Tools
Image Resizer & Compressor
Resize an image and convert it to JPG, PNG or WebP — right in your browser. Your image never leaves your device.
Guides
10 Free Calculators Every Small Business Needs
The money questions every owner asks, and the free calculator that answers each one — the calculators in this guide now live on ProKit, our sister site for business tools.
Run a small business for more than a week and the same money questions keep coming back. What should I charge? Can I afford that loan? How much of a sale do I actually keep? None of them needs a spreadsheet, and none of them needs an accountant on call — each one needs about thirty seconds and the right calculator. These are the ten our visitors reach for most, in roughly the order the questions show up.
1 Profit Margin Calculator
This is the number that decides whether a sale actually made you money. Enter what a product or a job brought in and what it cost you, and you get three things back: the profit in dollars, the margin — the share of every sale you keep — and your markup. A bakery owner who knows the margin on a wedding cake knows whether a fully booked month was a good month, or just an exhausting one. Recheck it whenever supplier prices, ingredients or your own prices change.
Open the Profit Margin Calculator on ProKit2 ROI Calculator
Every business spends money hoping more comes back: a Facebook ad campaign, a better coffee machine, a stall at the summer market. ROI — return on investment — turns that hope into a number. Put in $500 and get back $750 and you have made a 50% return. Run it honestly after each spend and a pattern appears fast: some costs earn their keep every time, and some were never worth it.
Open the ROI Calculator on ProKit3 Break-Even Calculator
Break-even is the point where you have sold just enough to cover your costs — not a dollar of profit yet, but not a loss either. It needs three numbers: your fixed costs (rent, insurance, the bills that land no matter what), your price, and what each unit costs you to buy or make. Out comes the exact number of units you must sell. It is the first figure a new business should know, and the one to revisit before hiring anyone or signing a bigger lease.
Open the Break-Even Calculator on ProKit4 Discount Calculator
Sales are easy to announce and surprisingly easy to get wrong. Take 25% off a $120 service and the customer pays $90 — but what did you hand back, in actual dollars, and will the extra orders cover it? This calculator shows the sale price and the exact amount saved, so a promotion becomes a decision instead of a guess. It earns its place before Black Friday, and again at the counter when someone asks for “a little something off”.
Open the Discount Calculator on ProKit5 Loan Calculator
Borrowing is neither good nor bad — borrowing blind is where businesses get hurt. Enter the amount, the interest rate and the term, and you will see the monthly payment, the total you will hand back over the life of the loan, and how much of that total is pure interest. That last figure is the one that makes people sit up. Lay two or three offers side by side and the cheapest loan is often not the one with the smallest monthly payment.
Open the Loan Calculator on ProKit6 Compound Interest Calculator
Compounding means your interest starts earning interest of its own, and given years, the effect is bigger than most people expect. Use it to see what a small monthly surplus could grow into, or what an owner's retirement savings look like growing alongside the business. It cuts the other way too — it is the clearest picture of why carrying a credit card balance is so expensive.
Open the Compound Interest Calculator on ProKit7 Percentage Calculator
Underneath almost every other number in this list sits a percentage: tax rates, discounts, margins, price rises. This calculator answers the three forms the question actually takes — what is X% of Y, X is what percent of Y, and how much did something change between two numbers. When a supplier moves a price from $40 to $46, this is how you know that is a 15% rise and not just “a bit more than before”.
8 Sales Tax Calculator
Sell in the United States and sales tax follows you around — every state sets its own rate, plenty of cities add theirs, and customers quite reasonably want the full price before they commit. Enter the price and your local rate and you get the tax amount and the total with tax, to the cent. Quotes and invoices get cleaner, and there is no awkward pause at the register while somebody works it out on a phone.
Open the Sales Tax Calculator on ProKit9 Tip Calculator
Anyone who runs a restaurant, salon or bar faces this every night: what is a fair tip on this bill, and how does a table of six split it without an argument? Enter the bill, pick the percentage, say how many people are paying, and you get the tip, the total, and each person's share. It is just as handy on the other side of the counter, on the night you take the whole team out after a long week.
Open the Tip Calculator on ProKit10 Hourly Wage Calculator
Hiring your first employee — or pricing your own hours as a freelancer — starts with one question: what does an hourly rate actually add up to? Enter the rate and the hours in a week and you will see the weekly pay, the smoothed-out monthly figure, and the yearly total. That yearly number is the one to weigh against a salary, a contract rate, or your staffing budget before you commit to any of them.
Open the Hourly Wage Calculator on ProKitEvery calculator in this list is free on ProKit, needs no sign-up, and runs right in your browser — your numbers never leave your device. Bookmark the two or three you will use weekly. Five minutes with the right figures today is almost always cheaper than the lesson you would learn the other way.