Every tool, one library
158 tools across 9 categories. Search or filter to jump to what you need.
BMI Calculator
Body Mass Index calculator with metric & imperial units.
Percentage Calculator
Calculate X% of Y, and X as a percentage of Y.
Age Calculator
Calculate exact age in years, months and days.
Loan / EMI Calculator
Monthly EMI, total interest and total payable for any loan.
Tip Calculator
Split a bill with tip across any number of people.
Discount Calculator
Final price after % discount and total savings.
GST / VAT Calculator
Add or remove GST / VAT from any amount.
Compound Interest Calculator
Future value with custom compounding frequency.
Simple Interest Calculator
Interest = P × R × T / 100.
Date Difference
Days, weeks, months between two dates.
Time Difference
Hours and minutes between two times.
Mortgage Calculator
Monthly mortgage payment, interest and total.
Savings Goal Calculator
Monthly savings needed to hit any goal.
Salary to Hourly
Convert annual salary into hourly, weekly, monthly.
Fuel Cost Calculator
Trip fuel and total cost from mileage.
Ratio Calculator
Simplify and scale any ratio A : B.
PayPal Fee Calculator
Net amount after PayPal fees.
Calorie Calculator
Daily calorie needs (BMR & TDEE).
Body Fat Calculator
Body-fat estimate via US Navy method.
Percentage Change Calculator
% increase or decrease between two values.
Sales Tax Calculator
Tax and total from net price.
Pregnancy Due Date Calculator
Estimated due date from LMP.
Paint Calculator
Litres of paint needed for a room.
GPA Calculator
Weighted GPA on the 4.0 scale.
Water Intake Calculator
Daily water needs by weight and activity.
Dog Age Calculator
Human-equivalent age for your dog.
Electricity Bill Calculator
Daily, monthly and yearly running cost.
Word Counter
Count words, characters, sentences and reading time.
Case Converter
UPPER, lower, Title, camel, snake, kebab — all at once.
Lorem Ipsum Generator
Generate filler text in words, sentences or paragraphs.
Reverse Text
Reverse characters or word order of any string.
Remove Duplicate Lines
Deduplicate any list of lines, with trim and case options.
Slugify (URL Slug Generator)
Turn any title into a clean URL slug.
Sort Lines Alphabetically
Sort any list of lines, ascending or descending.
Find and Replace
Replace text with plain or regex matching.
Text Repeater
Repeat any text N times with a separator.
Binary ↔ Text Converter
Convert text to binary and back, UTF-8 safe.
Word Frequency Counter
See how often each word appears in your text.
Text to HTML Converter
Wrap plain text into clean HTML paragraphs.
Strip HTML Tags
Remove all HTML tags from any markup.
Line Counter
Count total, non-empty lines and longest line.
Palindrome Checker
Detect whether a string reads the same backwards.
ROT13 Encoder / Decoder
Classic letter-rotation cipher.
Speech Timer
Estimate speaking time at slow / normal / fast pace.
Whitespace Cleaner
Collapse spaces and drop empty lines.
Reading Time Estimator
Estimate how long an article will take to read.
UPPERCASE Converter
Convert any text to UPPERCASE.
lowercase Converter
Convert any text to lowercase.
Title Case Converter
Properly Capitalised Titles.
Sentence case Converter
First letter of each sentence capitalised.
Remove Line Breaks
Strip line breaks, optionally keep paragraphs.
JSON String Escape / Unescape
Escape or unescape any string for JSON.
Leet Speak (1337) Converter
Convert text to l33t sp34k.
Pig Latin Translator
Translate English to Pig Latin.
JSON Formatter
Format, validate and minify JSON.
URL Encoder / Decoder
Percent-encode or decode URLs and query strings.
Base64 Encoder / Decoder
Encode and decode Base64 strings.
Color Converter
Convert between HEX, RGB and HSL color values.
CSV to JSON
Convert any CSV table to a JSON array of objects.
HTML Entities Encoder
Encode and decode HTML entities safely.
Number Base Converter
Binary, octal, decimal and hex — all at once.
Length Unit Converter
mm, cm, m, km, in, ft, yd, mi.
Temperature Converter
Celsius, Fahrenheit and Kelvin.
Unix Timestamp Converter
Convert between Unix time and human dates.
Markdown to HTML
Convert Markdown to clean HTML with preview.
Morse Code Translator
Text ↔ Morse code, both ways.
Weight Unit Converter
kg, g, lb, oz, ton — instantly.
Speed Unit Converter
km/h, mph, m/s, knots and ft/s.
Area Unit Converter
sqm, sqft, acre, hectare and more.
Volume Unit Converter
Liters, gallons, cups and pints.
YAML to JSON
Convert simple YAML configs to JSON.
Roman Numeral Converter
Convert numbers to Roman numerals and back.
JSON to CSV
Flatten any JSON array into a CSV table.
CM to Inches Converter
Centimetres to inches and feet+inches.
Kg to Lbs Converter
Kilograms to pounds and stone.
Miles to Km Converter
Imperial miles to metric kilometres.
Number to Words Converter
Spell out any number in English words.
Unicode Escape Converter
Escape / unescape Unicode characters.
IBAN Formatter & Validator
Format and validate any IBAN.
Credit Card Formatter & Luhn Check
Format card number, detect brand, validate Luhn.
Text to Base64 Converter
Encode text to standard and URL-safe Base64.
Image to Base64
Convert any image to a Base64 data URL.
Image Resizer
Resize images to exact dimensions in your browser.
Image Compressor
Reduce image file size while keeping quality.
Image Rotator & Flipper
Rotate or mirror any image, 90 / 180 / 270°.
Image Format Converter
Convert between PNG, JPEG and WebP.
Image Filters
Apply brightness, contrast and saturation filters.
Image Cropper
Crop an image to exact pixel dimensions.
Image Metadata Viewer
Inspect dimensions, type and file size.
Image Flip
Flip an image horizontally or vertically.
Image Grayscale Converter
Convert any image to black & white.
Image Blur Tool
Apply a Gaussian blur to any image.
Image Colour Picker
Pick HEX colours from any pixel.
Merge PDF
Combine multiple PDFs into one document.
Split PDF
Split a PDF into separate pages or ranges.
Compress PDF
Reduce PDF size without losing quality.
Image to Text (OCR)
Extract text from images and screenshots.
PDF to Text
Extract searchable text from PDFs.
Profit Margin Calculator
Calculate margin, markup and profit instantly.
Break-Even Calculator
Find break-even units and revenue.
ROI Calculator
Return on investment and net profit.
Bulk Discount Calculator
Total, savings and effective unit price.
Markup Calculator
Set selling price from cost and target markup.
Marketplace Fee Calculator
Net payout after Etsy, eBay or Amazon fees.
Stripe Fee Calculator
Net after 2.9% + 30¢ Stripe fees.
SKU Generator
Generate clean, consistent product SKUs.
Shipping Label Maker
Create printable shipping labels.
CAC (Customer Acquisition Cost)
Cost to acquire one new customer.
Customer LTV Calculator
Lifetime value of a customer.
Conversion Rate Calculator
Visitors-to-conversion percentage.
Average Order Value (AOV) Calculator
Revenue ÷ orders.
Inventory Turnover Ratio
Turnover ratio and days of inventory.
Cart Abandonment Rate
Percentage of carts not completed.
Password Generator
Strong, cryptographically-random passwords.
UUID Generator
Generate v4 UUIDs in bulk.
Hash Generator
SHA-1, SHA-256, SHA-384 and SHA-512 hashes.
Random Number Generator
Pick random numbers in a range, with unique option.
Regex Tester
Test regular expressions live against any string.
JWT Decoder
Inspect JWT header and payload (no verification).
URL Parser
Break any URL into its component parts.
QR Code Generator
Create downloadable QR codes for any text or URL.
Text Diff Checker
Compare two texts line by line.
CSS Gradient Generator
Build and copy linear CSS gradients.
Placeholder Image URL
Lorem Picsum URLs for any dimension.
User-Agent Parser
Parse browser, OS and device from a UA string.
Cron Expression Describer
Plain-English description of a cron schedule.
Base32 Encoder / Decoder
Encode and decode Base32 strings.
Color Palette Generator
Tints, shades and complements from one color.
CSS Minifier
Remove whitespace and comments from CSS.
HTML Minifier
Strip whitespace and comments from HTML.
JSON Minifier
Minify JSON to a single compact line.
Online Stopwatch
Browser stopwatch with lap times.
Coin Flip Simulator
Virtual coin flipper with history.
Dice Roller
Roll any number of N-sided dice.
Yes / No Decider
Random binary decision maker.
Random Name Picker
Pick a random winner from a list.
CSS Box-Shadow Generator
Visual box-shadow builder with live CSS.
CSS Border-Radius Generator
Per-corner border-radius visual editor.
MAC Address Generator
Bulk generate random MAC addresses.
Countdown Timer
Live countdown to any date and time.
Business QR Code Generator
Free, branded QR codes for any business.
AI Chat Playground
Free multi-turn AI chat assistant.
AI Vision Q&A
Upload an image, ask AI anything.
AI Long-Form Writer
Write full articles with H2 sections.
AI Code Explainer
Explain any code snippet clearly.
AI Text Summarizer
Condense long text into a clear summary.
AI Grammar Fixer
Polish grammar, spelling and punctuation.
AI Translator
Translate text into any language.
AI Paraphraser
Rewrite text to be clearer and original.
AI Email Writer
Draft professional emails in seconds.
AI Hashtag Generator
Relevant hashtags for any social post.
AI Title Generator
Click-worthy titles for articles and videos.
AI Blog Outliner
Full blog post outline with H2 sections.
AI Tweet Writer
Five tweet options under 280 characters.
AI Product Description Writer
Conversion-focused e-commerce copy.
AI Bio Generator
Social media bios under 160 characters.
AI FAQ Generator
Auto-generate FAQ sections.
AI Meta Description Writer
SEO meta descriptions under 155 chars.