Free Online Tools
Tools for developers,
designers & creators
Browser-based tools that work instantly. No account, no data uploads, no nonsense.
Calculators
View all →Age Calculator
Exact age in years, months, days and more
JS tool → ⚖BMI Calculator
BMI and category with a visual scale
JS tool → 🔥BMR Calculator
Calories at rest and with your activity level
JS tool → 📅Date Difference Calculator
Days, weeks, months and working days between dates
JS tool → ⊖Discount Calculator
Sale price and savings in one step
JS tool → ↔Length Converter
All length units in one conversion table
JS tool → %Percentage Calculator
Three percentage calculations in one tool
JS tool → ↑%Percentage Increase Calculator
Percentage increase, decrease and multiplier at once
JS tool → ◈Profit Margin Calculator
Gross profit, margin and markup in one place
JS tool → 🎲Random Number Generator
Random integers, unique or repeated, in any range
JS tool → ₤Salary Calculator
Annual to hourly — every pay period at once
JS tool → $Sales Tax Calculator
Tax amount and total from any rate
JS tool → 🌡Temperature Converter
Celsius, Fahrenheit, Kelvin and Rankine at once
JS tool → £VAT Calculator
Add or remove VAT in either direction
JS tool → ⚖Weight Converter
Every weight unit in one conversion table
JS tool → 🍳Cooking Converter
Convert cups, tablespoons, grams and ounces
JS tool → 💾Data Storage Converter
Convert bits, bytes, KB, MB, GB, TB and more
JS tool → 01Number Base Converter
Convert between binary, decimal, hex and more
JS tool → AbcNumber to Words
Convert numbers to English words
JS tool → 🧪Volume Unit Converter
Convert between metric and US volume units
JS tool →HTML Tools
View all →Colour Contrast Checker
Check WCAG colour contrast compliance
JS tool → 🔄Colour Format Converter
Convert between HEX, RGB, HSL, HSV, CMYK
JS tool → 🏷Meta Tag Generator
Generate SEO and Open Graph meta tags
JS tool → ◻Box Shadow Generator
Build CSS box-shadows visually
JS tool → pxCSS Unit Converter
Convert between CSS units accurately
JS tool → 🎨Colour Picker
Pick a colour and get HEX, RGB, HSL, HSV
JS tool → ⊞Excel to HTML Table
Convert spreadsheet data to HTML tables
JS tool → <>HTML Encoder / Decoder
Encode or decode HTML special characters
JS tool → THTML to Plain Text
Strip HTML tags and extract plain text
JS tool → ✂Strip HTML Tags
Remove HTML tags with custom keep-list
JS tool →Image Tools
View all →Aspect Ratio Calculator
Solve the missing side, name the ratio
PHP tool → ⇄Batch File Renamer
Preview a rename before you run it
PHP tool → ⋯EXIF Data Viewer
See what your photos are telling people
PHP tool → ⛁File Size Estimator
How big is that batch, and how long to send it
PHP tool → ⇋Image Format Converter
JPEG, PNG, WebP and AVIF, one file at a time
PHP tool → ⤢Image Resize Calculator
New dimensions without guessing the maths
PHP tool → ⎙Photo DPI Calculator
Will it print sharp at that size?
PHP tool → ◑Watermark Opacity Tester
Find the opacity that protects without ruining the shot
PHP tool → ⊞Watermark Position Previewer
See all nine placements on your own photo
PHP tool → ©Watermark Text Generator
Correctly formatted copyright lines, ready to copy
PHP tool →