Password Generator
Create strong, secure passwords in one click.
Open ToolFab tools, all free, all yours
Free online tools you'll really love to use.
Beautifully crafted online tools that help you solve everyday problems quickly, accurately and without distractions.
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Find the right tool in seconds
Every tool, neatly organised so you find exactly what you need.
PDF Tools
Coming soonMerge, split and convert documents with ease.
Image Tools
Coming soonResize, compress and convert images instantly.
AI Tools
Coming soonSmart assistants for writing and ideas.
Featured tools
A handful of favourites, ready to use right now.
VAT Calculator
Add or remove VAT with precise accuracy.
Open ToolWord Counter
Count words, characters and reading time live.
Open ToolCase Converter
Convert text to uppercase, title case and coding styles.
Open ToolJSON Formatter & Validator
Validate, beautify and minify JSON in your browser.
Open ToolRegex Tester
Test JavaScript regex patterns, flags and matches live.
Open ToolCurrency Converter
Convert currencies with current reference rates.
Open ToolPercentage Calculator
Work out percentages the simple way.
Open ToolPercentage Difference Calculator
Compare two values without treating either as the original.
Open ToolAge Calculator
Find your exact age down to the day.
Open ToolLoan Repayment Calculator
Estimate payments, interest and payoff time.
Open ToolTip Calculator
Calculate a tip and split the bill fairly.
Open ToolBMI Calculator
Calculate BMI and a standard healthy-weight range.
Open ToolCompound Interest Calculator
Project savings growth and interest over time.
Open ToolProfit Margin & Markup Calculator
Calculate profit, margin, markup and target selling prices.
Open ToolDate Difference Calculator
Find the exact time between any two dates.
Open ToolWorking Days Calculator UK
Count weekdays and exclude UK bank holidays.
Open ToolTime Duration Calculator
Calculate elapsed time across midnight and subtract breaks.
Open ToolDiscount Calculator
Calculate sale prices, savings and stacked offers.
Open ToolCarpet Area Calculator
Combine room sections and estimate the carpet required.
Open ToolElectricity Cost Calculator
Estimate appliance running costs from your own tariff.
Open ToolFuel Cost & Trip Calculator
Estimate journey fuel costs and split them between passengers.
Open ToolPaint & Decorating Calculator
Estimate paint across multiple walls, coats and openings.
Open ToolBest Value & Unit Price Calculator
Compare pack sizes and find the lowest unit price.
Open ToolSalary to Hourly Pay Calculator
Convert gross pay using your real working schedule.
Open ToolAspect Ratio Calculator
Resize image and video dimensions without distortion.
Open ToolUUID / GUID Generator
Create secure UUID v4 identifiers locally in your browser.
Open ToolText Diff Checker
Compare two texts and highlight additions, deletions and changes.
Open Tool4–20 mA Level Calculator
Convert 4–20 mA signals to level, check five-point linearity and calculate setpoint simulation currents.
Open ToolConcrete Calculator
Estimate concrete for slabs, footings, round bases and post holes.
Open ToolWhy zacdaddytools?
A quiet philosophy behind every tool we make.
Lightning fast
Every tool loads instantly and responds the moment you type.
Free forever
No accounts, no paywalls, no surprises. Just tools that work.
Works everywhere
Designed mobile-first and beautiful on any device.
Privacy friendly
Your data stays with you. We keep things quiet and safe.
Simple by design
Clear, focused interfaces that get out of your way.
No clutter
Only what you need, arranged with intention and calm.