All tools
Every OZO tool in one place. All of them are free and work in your browser without an account.
37 tools
Documents
Invoices, estimates and other business documents, ready as PDF.
Invoice Generator
Create a professional invoice in minutes. Add your logo, items and taxes, then download a PDF. Free, no signup.
Estimate Generator
Send clear job estimates with a validity date, then turn an accepted estimate into an invoice in one click.
Quote Generator
Fixed-price quotes your client can accept and sign. Download a PDF, then turn it into an invoice. Free, no signup.
Receipt Generator
Payment receipts with a PAID stamp, payment method and transaction ID. Download a PDF in seconds. Free, no signup.
Purchase Order Generator
Purchase orders for your suppliers with a ship-to address, delivery date and terms. Free PDF, no signup.
Proforma Invoice Generator
Proforma invoices for deposits, customs and advance payment, clearly marked as not a tax invoice. Free PDF.
Credit Note Generator
Credit notes for refunds, returns and corrections, linked to the original invoice. Free PDF, no signup.
Packing Slip Generator
Packing slips with ship-to address, quantities ordered and shipped, and tracking. No prices shown. Free PDF.
Delivery Note Generator
Delivery notes with deliver-to address, quantities delivered and a received-by signature section. No prices. Free PDF.
Sales Order Generator
Confirm a customer order with items, prices and delivery date, then turn it into a packing slip or invoice.
Work Order Generator
Work orders with job site, technician, materials and labour, and a customer sign-off. Free PDF, no signup.
Timesheet Generator
Timesheets that add up hours from start and finish times, with rates, totals and an approval signature. Free PDF.
Account Statement Generator
Customer statements with invoices, payments, a running balance, amount due and ageing. Free PDF, no signup.
Calculators
Quick, accurate calculators for money, time and everyday maths.
Profit Margin Calculator
Work out profit, margin and markup from cost and price, or the price you need for a target margin. Free.
Markup Calculator
Find the selling price from cost and markup, or the markup from cost and price, with the matching margin.
VAT & Sales Tax Calculator
Add VAT, GST or sales tax to a price, or take it out of a gross amount. Any rate, instant results. Free.
Discount Calculator
See the sale price and how much you save from a percentage or fixed discount, including stacked discounts.
Percentage Calculator
Percent of a number, what percent one number is of another, and percentage increase or decrease.
Loan & EMI Calculator
Monthly payment, total interest and an amortisation schedule for any loan amount, rate and term. Free.
Break-Even Calculator
How many units you need to sell to cover your costs, or to reach a profit target, and the revenue that takes.
Compound Interest Calculator
See how savings grow with compound interest and monthly contributions, year by year. Free and instant.
Salary to Hourly Calculator
Convert pay between hourly, daily, weekly, monthly and annual, using your own hours and weeks worked.
Freelance Rate Calculator
Work out the hourly and day rate you need to charge for your target income after tax, expenses and time off.
Late Payment Interest Calculator
Calculate interest and fees on an overdue invoice from the amount, rate and days late. Free, instant.
ROI Calculator
Return on investment, net profit and annualised return for any investment, campaign or project. Free and instant.
Tip & Split Bill Calculator
Work out the tip and split the bill between any number of people, with optional rounding up. Free and instant.
Overtime Pay Calculator
Work out overtime pay at time and a half, double time or any rate, with regular and overtime pay shown separately. Free.
Working Days Calculator
Count working days between two dates, or add business days to a date, skipping weekends and holidays. Free.
Currency Converter
Convert between 160+ currencies with daily reference rates from the European Central Bank and Exchange Rate API. Free.
Makers
Create things in seconds: QR codes, signatures, labels and more.
QR Code Generator
Make QR codes for links, Wi-Fi, contact cards, email, phone and text. Custom colours, PNG or SVG download. Free.
Signature Maker
Draw your signature or type it in a handwriting font, then download a transparent PNG for documents. Free.
Barcode Generator
Create Code 128, EAN-13, UPC-A and Code 39 barcodes for products and labels. PNG or SVG download. Free.
Password Generator
Generate strong random passwords and PINs on your device, with a strength meter and look-alike characters removed on request. Free.
Image Resizer
Resize, crop and compress photos to exact pixels, a percentage or social media sizes. JPG, PNG or WebP. Nothing is uploaded.
Colour Palette Generator
Build colour palettes from one brand colour: harmonies, tints and shades, contrast checks, and CSS or Tailwind export. Free.
Business Card Maker
Design a business card with your logo and brand colour, add a QR code to the back, and download print-ready 300 DPI files. Free.
Letterhead Maker
Create a company letterhead with your logo, contact details and brand colour. Print or save as PDF, or download PNGs for Word. Free.
Missing a tool you need? Suggest one.
Frequently asked questions
Are all OZO tools really free?
Yes. Every document generator, calculator and maker is free. There is no premium plan, no watermark fee and nothing hidden behind a paywall.
Do the PDFs have a watermark or any OZO branding?
No. Your documents are clean: no watermark and no “made with” line, so you can send them to clients exactly as they are.
Do I need an account to use a tool?
No. Open any tool and use it straight away. There is nothing to sign up for or install.
How do I find the right tool quickly?
Type in the search box at the top of this page, for example “invoice”, “tax” or “QR”. Press / to jump to it, or use the Documents, Calculators and Makers buttons to narrow the list.
Where is my work stored?
Your drafts stay in your own browser, and PDFs, QR codes, images and other files are created on your device. Nothing you type into a tool is uploaded.
Can I ask for a tool that is missing?
Yes. Send your idea through the contact page. New tools are added regularly, and many come from suggestions.