Put a free tool on your website
Every tool below can be embedded on your own site, blog, or documentation with a single line of HTML. The tool runs entirely in your visitor's browser, so there is no signup, no API key, and nothing to maintain. It is free, and it stays free.
1. Pick a tool
Choose any of the tools listed below.
2. Copy the code
Open the tool and copy its one-line embed snippet.
3. Paste it in
Drop the code into your page. That is the whole setup.
108tools available to embed. Please keep the small "Powered by ToolHub" link that ships with each embed.
Calculators
Age Calculator
Exact age in years, months, days, and more
Aspect Ratio Calculator
Solve dimensions for 16:9, 4:3, and any ratio
BMI Calculator
Body Mass Index with healthy weight range
Body Fat Calculator
Estimate body fat % with the US Navy method
Calorie Calculator
TDEE, BMR, and daily calorie target with macros
Compound Interest Calculator
Project savings with regular contributions and any compounding frequency
Concrete Calculator
Bags, yards, and cost - slabs, footings, and more
Date Duration Calculator
Days between dates, plus add or subtract from a date
Deck Calculator
Boards, joists, posts, and cost for any deck
Discount Calculator
Percent off, sale price, stacked discounts, you-save amount
Drywall Calculator
Sheets, screws, mud, and tape for any room
Fence Calculator
Posts, panels, concrete, and cost
Flooring Calculator
Square feet, boxes, and cost for any room
Fraction Calculator
Add, subtract, multiply, divide - with steps and simplification
Fuel Cost Calculator
Trip fuel and cost from distance, economy, and price
GPA Calculator
Semester + cumulative GPA across multiple grade scales
Gravel Calculator
Tons, cubic yards, and bags for driveways and paths
Hours Calculator
Time between two clock times, plus timesheets
Loan Calculator
Auto, student, personal, home-equity - with amortization
Mortgage Calculator
Monthly payment, total interest, and full amortization schedule
Mulch Calculator
Cubic yards and bags for any garden bed
Ovulation Calculator
Find your fertile window and ovulation days
Paint Calculator
Gallons of paint for any room
Percentage Calculator
Every common percentage calculation, instantly
Pregnancy Due Date Calculator
Estimate your due date from LMP, conception, or IVF
Roofing Calculator
Squares, bundles, underlayment, and cost
Salary Calculator
Convert pay between hourly, weekly, monthly, and annual
Sales Tax Calculator
Add or reverse sales tax / VAT / GST with state presets
Scientific Calculator
Trig, logs, powers, factorial - with keyboard input and history
Statistics Calculator
Mean, median, mode, range, and standard deviation
Tile Calculator
Tiles, grout, and cost for any floor or wall
Timer & Stopwatch
Countdown timer, stopwatch, and Pomodoro in one
Tip Calculator
Tip + total + split between any number of people
Converters
Currency Converter
Live exchange rates for 160+ world currencies
Roman Numeral Converter
Number to Roman and Roman to number, with breakdown
Text to Binary
Text to binary, decimal, hex, octal - and back
Time Zone Converter
Convert one time across multiple cities side by side
Unit Converter
Convert length, weight, temperature, and more
Generators
Barcode Generator
Create Code 128, EAN, UPC barcodes - download PNG or SVG
Color Contrast Checker
WCAG AA/AAA contrast ratio with live preview
Color Picker
Pick colors and convert between formats
CSS Box Shadow Generator
Design layered shadows with live preview and code
Emoji Picker
Search, browse, and copy emoji with one click
Gradient Generator
Design beautiful CSS gradients with live preview
Image Placeholder Generator
Create placeholder images at any size and color
List Randomizer
Shuffle a list or pick a winner
Password Generator
Strong, random passwords in one click
Password Strength Checker
Entropy, crack-time estimate, and weakness detection
QR Code Generator
Create QR codes for any text or URL
Random Number Generator
Numbers, dice, coin flip, and list picker - crypto-secure
ULID Generator
Generate sortable unique IDs
UUID Generator
Generate UUID v4 identifiers
Developer
Base64 Encoder/Decoder
Encode and decode Base64 text
Basic Auth Header Generator
Build HTTP Basic Auth headers
Chmod Calculator
Unix file permissions to octal
Content-Type Parser
Break down a Content-Type header
Cron Expression Generator
Build and understand cron schedules in plain English
CSS Clamp Generator
Fluid responsive sizes with clamp()
CSS Minifier & Beautifier
Minify CSS to shrink it, or beautify to format it
CSS Specificity Calculator
Score any CSS selector
CSV ↔ JSON Converter
Convert between CSV and JSON, both ways
cURL to Fetch Converter
Turn curl commands into fetch()
Hash Generator
MD5, SHA-1, SHA-256, SHA-512 hashes
HMAC Generator
Generate HMAC signatures
HTML Entity Encoder
Encode and decode HTML entities
HTML Minifier & Beautifier
Minify HTML to shrink it, or beautify to format it
HTTP Headers Parser
Parse raw HTTP headers
JavaScript Minifier
Minify JS to shrink your files
JSON Compare
Diff two JSON objects
JSON Formatter
Format, validate, and minify JSON
JSON Key Sorter
Sort JSON object keys alphabetically
JSON Lines Converter
Convert between JSON and JSONL
JSON Schema Validator
Validate JSON against a schema
JSON to TypeScript
Generate TypeScript types from JSON
JSON to XML Converter
Convert JSON to XML and XML back to JSON
JSONPath Tester
Query JSON with JSONPath
JWT Decoder
Decode and inspect JSON Web Tokens
JWT Generator
Create and sign JSON Web Tokens
Markdown ↔ HTML Converter
Convert between Markdown and HTML with live preview
Meta Tag Generator
SEO + Open Graph + Twitter meta tags with live preview
MIME Type Lookup
Find the MIME type for any file
Number Base Converter
Binary, octal, decimal, hex with live sync
Query String Parser
Parse and build URL query strings
Regex Tester
Test, debug, and learn regular expressions
robots.txt Tester
Test if a URL is allowed or blocked
Slug Generator
Turn any title into a clean URL slug
SQL Formatter
Format and beautify SQL queries
Text Encrypt and Decrypt
Encrypt text with a password
Timestamp Converter
Convert Unix epoch to human dates and back
URL Encoder / Decoder
Encode and decode URL-safe text
URL Parser
Break any URL into its parts
User Agent Parser
Decode any browser User-Agent
UTM Builder
Build trackable campaign URLs
XML Formatter
Format or minify XML
YAML ↔ JSON Converter
Convert between YAML and JSON instantly
YAML Validator
Validate and format YAML
Text
Lorem Ipsum Generator
Generate placeholder text in seconds
Markdown Table Generator
Build Markdown tables visually
Reading Time Calculator
Estimate reading and speaking time for any text
Sort & Deduplicate Lines
Sort, dedupe, and clean up text lines
Text Case Converter
Convert between UPPER, lower, camelCase, and more
Text Diff Checker
Compare two texts and see the differences
Word Counter
Count words, characters, and reading time
Word Frequency Counter
Keyword density and word counts for any text
Image
Color Converter
Convert HEX, RGB, and HSL colors
SVG Optimizer
Clean and shrink SVG files
SVG to Data URI
Inline SVG for CSS and HTML
SVG to PNG
Rasterize SVG to PNG at any scale, transparent or color background
Want a tool that is not listed?
If you would like to embed a tool that does not show an embed option yet, or you want a customised version for your site, get in touch and we will help you set it up.