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Online Web Tools

55 free tools for the everyday jobs of building and running a website. No account, no sign-up — open one and use it.

Calculation

BMI Calculator Work out body mass index from a height and a weight
Currency Converter Convert money from one currency to another quickly
Percentage Calculator Work out percentages, increases, decreases and shares of a number

Conversion

HEX to RGB Converter Turn a hex colour like #7C3AED into the red, green and blue values behind it
Number Base Converter Convert a number between binary, octal, decimal and hexadecimal
RGB to HEX Converter Turn red, green and blue values into the hex colour a stylesheet wants
Roman Numeral Converter Convert between Roman numerals and ordinary numbers
Text & Binary Converter Turn text into the binary that stores it, and binary back into text
Unit Converter Convert between common units of length, mass, temperature and more

Generator

Random Number Generator Draw random numbers in a range, with or without repeats
UUID Generator Generate random UUIDs -- one or many -- to use as identifiers

Miscellaneous

Phone Lookup Check where a phone number is from, what kind of line it is and how to write it in international form
Website Screenshot Generator Capture a screenshot of a web page as it looks right now
Word Lookup Look up the meaning of an English word -- its part of speech, its senses and examples

Network

DNS Lookup Look up the DNS records of a domain name -- addresses, mail servers, name servers and more
Email Checker Check the shape of an email address and whether its domain can receive mail
HTTP Status Checker Ask a URL what it answers with -- its status code, redirects and server
IP Address Lookup Look up the country, city, network and time zone behind an IP address
IPv4 Subnet Calculator Work out the network, broadcast, mask and host range a CIDR block describes
Port Checker See whether a host has a particular network port open and answering
Reverse DNS Lookup Find the hostname behind an IP address -- the reverse of an ordinary DNS lookup
What Is My IP See the address this site sees you at, with the network details behind it
WHOIS Lookup Look up who registered a domain name, when it was registered and when it runs out

Programming

Base64 Encoder & Decoder Turn text into Base64, or read Base64 back into the text it stands for
CSS Minifier Strip the comments and needless whitespace out of a stylesheet
HTML Entity Encoder & Decoder Turn characters such as a less-than sign into HTML entities, and back
HTML Minifier Collapse the whitespace and comments in a block of HTML
HTTP Headers Viewer See the HTTP headers a server answers with for a URL
JSON Formatter Validate JSON and print it neatly indented, ready to read
Markdown to HTML Convert Markdown text into HTML you can paste into a page
ROT13,18,47 Encoding and Decoding Encode/Decode text in ROT13,18 and 47
Source Code Viewer View the HTML a server sends back for a URL, syntax highlighted
URL Encoder & Decoder Escape text so it can sit safely in a URL, or read it back again
URL Shortener Turn a long link into a short one you can paste anywhere

Security

.htpasswd Generator Create an Apache password entry to put a folder behind a login
Hash Generator Generate a hash of any text -- MD5, SHA1, SHA256, SHA512 and every other algorithm PHP knows
Password Generator Create a strong random password of the length and shape you choose
Password Strength Checker Estimate how long a password would take to crack by guessing
SSL Checker Read a domain's TLS certificate -- who issued it, what it covers and when it expires
SSL Generator Generate a self-signed certificate for a hostname, ready to paste into a server config

SEO

Code to Text ratio Work out how much of a page's weight is text and how much is code
Keyword Density Checker See which words a block of text repeats, and how often
Meta Tag Generator Write the title, description and social tags a page should carry
Reading Time Calculator Estimate how long a piece of writing takes to read aloud or silently
Robots.txt Generator Build a robots.txt that tells crawlers what to index and where the sitemap is
Slug Generator Turn a title into a clean, URL-safe address segment

Text

Case Converter Change the case of text -- upper, lower, title, sentence and more
Lorem Ipsum Generator Generate placeholder Latin text in the amount and shape you need
Remove Line Breaks Turn a block of wrapped text into one line, or into neat paragraphs
Reverse Text Reverse text by character, by word or by line
Sort & Remove Duplicate Lines Sort a list of lines and drop the duplicates in one pass
Word & Character Counter Count the words, characters, sentences and paragraphs in your text

Time

Age Calculator Work out an age in years, months and days from a date of birth
Date Difference Calculator Count the days, weeks and months between two dates
Timestamp Converter Convert between a Unix timestamp and a readable date and time