Free Online Tools to Make Everyday Work Easier
Mortgage and loan calculators, BMI, QR codes, passwords, invoices, image tools and more. No sign-up, no fuss.
โ 100% freeโ No sign-upโ Runs in your browser
Popular tools
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Mortgage CalculatorMonthly payment, total interest and yearly balance.
๐ณLoan CalculatorPayment and total cost of a personal or car loan.
๐Compound Interest CalculatorSee how savings grow with monthly deposits.
โ๏ธBMI CalculatorBody mass index with metric or imperial units.
๐ฅCalorie CalculatorEstimate daily calories to maintain your weight.
๐งพInvoice MakerCreate a professional invoice and save it as a PDF.
โฆQR Code GeneratorTurn a link or text into a downloadable QR code.
๐Password GeneratorCreate strong random passwords in your browser.
๐๏ธImage CompressorReduce image file size in your browser.
๐ผ๏ธImage ResizerResize JPEG, PNG and WebP images in your browser.
โ๏ธWord CounterCount words, characters, sentences and reading time.
AaCase ConverterChange text to upper, lower, title or sentence case.
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Percentage CalculatorPercent of a number, increase, decrease and difference.
๐Age CalculatorExact age in years, months and days, plus next birthday.
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Days Between Dates CalculatorDays, weeks and months between two dates.
๐Unit ConverterLength, weight, temperature, area, volume, time, speed, data.
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Why use ZapZab?
โก Free and instant
Open a tool and use it straight away. No account required.
๐ Private by design
Calculations, images and text are handled in your browser.
๐ Explained clearly
Each tool shows its formula, examples and answers to common questions.
Featured guides
How to Create a Professional Invoice for FreeLearn what every invoice should include, how to calculate tax and discounts, and how to create and save a clean invoice without paid software.How to Calculate Percentages: A Simple GuideThe four percentage calculations you will use most, with formulas and worked examples for discounts, increases and comparisons.How to Resize Images Without Stretching ThemUnderstand aspect ratio, how to keep proportions when changing width and height, and which file format to choose.
Frequently asked questions
Are ZapZab tools really free?
Yes. All tools are free to use with no account.
Are my files and text uploaded?
The tools run in your browser. What you type or choose is not sent to ZapZab by the tool code.
Can I use the results for work?
Yes, but review any result before relying on it, especially invoices and calculations.
How do I suggest a tool?
Use the Contact page.