Guides

F Free Online Tools for Designers Designers can convert colors, check contrast, generate gradients and shadows and prepare images with… F Free Online Tools for Developers Developers can format and validate JSON, encode data, build CSS and check contrast without… F Free Online Tools for SEO and Marketing Marketers can preview search snippets, create social sharing tags and structured data, check ad… F Free Online Tools for Small Business Small businesses can calculate prices, margins, timesheets and salaries, tidy documents and images, and… F Free Online Tools for Students Students can use free browser tools to check grades, solve maths, count words for… F Free Online Tools for Writers and Editors Writers and editors can count words, clean pasted text, fix capitalization and compare revisions… H How to Add a Text Watermark to a PDF To watermark a PDF, open Watermark PDF, choose your file, type the text such… H How to Add or Subtract Days, Months or Years from a Date To add or subtract time from a date, enter the start date, choose add… H How to Add Page Numbers to a PDF To add page numbers, open Add Page Numbers to PDF, choose your file, pick… H How to Add, Subtract, Multiply and Divide Fractions To calculate with fractions, use this fraction calculator: enter two fractions, choose an operation… H How to Build a Reusable Prompt Template To build a prompt template with this free prompt template generator, write your prompt… H How to Calculate a Discount and Sale Price To calculate a sale price, enter the original price and the discount percentage; the… H How to Calculate a Subnet from an IP and CIDR Prefix To calculate a subnet, enter an IP address and CIDR prefix such as 192.168.1.0/24… H How to Calculate a Tip and Split the Bill To calculate a tip, enter the bill amount and tip percentage, and the Tip… H How to Calculate BMI and What It Means To calculate BMI, enter your weight and height into the BMI Calculator; it divides… H How to Calculate BMR and Daily Calorie Needs (TDEE) To estimate calorie needs, enter your age, sex, height, weight and activity level into… H How to Calculate Exact Age in Years, Months and Days To calculate exact age, enter a date of birth and, optionally, the date to… H How to Calculate File Download Time To estimate download time, enter the file size and your connection speed into the… H How to Calculate Mean, Median, Mode and Range To calculate the average, paste your list of numbers into the calculator and it… H How to Calculate Percentages: Of, What Percent and Change To calculate a percentage, use the Percentage Calculator for one of three questions: what… H How to Calculate Running Pace per Kilometer and Mile To calculate running pace, enter your total time and distance into the Pace Calculator… H How to Calculate Standard Deviation and Variance To calculate standard deviation, paste your numbers and choose sample or population; the calculator… H How to Calculate the Final Exam Score You Need To find the score you need on a final exam, enter your current grade,… H How to Calculate the Number of Days Between Two Dates To count the days between two dates, enter a start and end date in… H How to Calculate Timesheet Hours and Overtime To calculate timesheet hours, enter each shift's clock-in and clock-out in the Employee Timesheet… H How to Calculate Your GPA on the 4.0 Scale To calculate GPA, list each course grade and its credit hours in the GPA… H How to Change Text Case: Upper, Lower, Sentence and Title To change text case, paste your text into a case converter and choose UPPERCASE,… H How to Check Ad Copy Against Google and Meta Character Limits To check ad copy, paste your headline or description into the Character Counter for… H How to Check Color Contrast for WCAG Accessibility To check contrast, enter a text color and a background color into the WCAG… H How to Compare Two Texts and See the Differences To compare two texts, paste the original into one box and the changed version… H How to Compress an Image to Reduce File Size To compress an image, open the Image Compressor, choose a JPEG or WebP file… H How to Convert a Time Between Time Zones To convert a time between zones, enter the date and time, choose the source… H How to Convert an Image to a Base64 Data URL To convert an image to Base64, open Image to Base64, choose your file and… H How to Convert an IPv4 Address to Binary, Hex and Decimal To convert an IPv4 address, enter it in dotted decimal form into the IP… H How to Convert Area: Square Feet, Square Meters and Acres To convert area, enter a value and choose units in the Area Converter, which… H How to Convert Between Fractions and Decimals To convert a fraction to a decimal, divide the numerator by the denominator; the… H How to Convert Between Kilograms, Pounds and Ounces To convert weight, enter a value and choose the from and to units in… H How to Convert Between Metric and Imperial Length Units To convert lengths, enter a value, choose the unit you have and the unit… H How to Convert Bytes, KB, MB, GB and TB To convert data storage sizes, enter a value and choose units in the Data… H How to Convert Celsius, Fahrenheit and Kelvin To convert temperature, enter a value and choose Celsius, Fahrenheit or Kelvin; the Temperature… H How to Convert Height Between Feet and Inches and Centimeters To convert height, enter feet and inches, or centimeters, into the Height Converter and… H How to Convert HEX Colors to RGB and HSL To convert a HEX color, enter the code such as #2563FF into the Color… H How to Convert Hourly Pay to Annual Salary To use an hourly to salary calculator, convert hourly pay to an annual salary:… H How to Convert Images Between PNG, JPG and WebP To convert an image, open the Image Converter, choose your file and pick PNG,… H How to Convert Images to a PDF To turn images into a PDF, open Images to PDF, choose your PNG or… H How to Convert JSON to CSV and Back To convert JSON to CSV, paste a flat array of JSON objects into the… H How to Convert Numbers to Scientific Notation To write a number in scientific notation, express it as a number between 1… H How to Convert Speed: km/h, mph, m/s and Knots To convert speed, enter a value and choose units in the Speed Converter, which… H How to Convert Test Points to a Percentage and Letter Grade To convert a test score to a percentage, divide the points earned by the… H How to Convert Volume: Liters, Cups, Tablespoons and Gallons To convert volume, enter a value and choose the from and to units in… H How to Count Characters With and Without Spaces Paste your text into a character counter to see the total with and without… H How to Count Words in Any Text To count words, paste or type your text into a word counter and read… H How to Create a Clean URL Slug from a Title To create a URL slug, paste your title into the Slug Generator and it… H How to Create a CSS Box Shadow To create a box shadow, set the offsets, blur, spread and color in the… H How to Create a CSS Linear Gradient To create a CSS gradient, pick two colors and an angle in the Gradient… H How to Create a Favicon (.ico) from an Image To create a favicon, open the Favicon Generator, choose a square image and download… H How to Create a robots.txt File To create a robots.txt file, set your allow and disallow rules and sitemap URL… H How to Create FAQ Schema (FAQPage JSON-LD) To create FAQ schema, enter your questions and answers into the FAQ Schema Generator… H How to Create Open Graph and Twitter Card Meta Tags To create social sharing tags, fill in your page title, description, URL and image… H How to Crop an Image to an Exact Size To crop an image online, open the Image Cropper, choose your file and enter… H How to Delete or Reorder PDF Pages To delete pages from a PDF or reorder them, open the PDF Page Deleter… H How to Encode and Decode Base32 and Base58 To encode Base32 or Base58, paste your text, pick the encoding and choose Encode;… H How to Encode and Decode Base64 To encode Base64, paste your text into the Base64 tool and choose Encode; to… H How to Encode and Decode HTML Entities To encode HTML entities, paste your text into this HTML entity encoder and choose… H How to Escape and Unescape a JSON String To escape a JSON string, paste your raw text into the tool and choose… H How to Estimate Ideal Body Weight To estimate ideal body weight, enter your sex and height into the Ideal Weight… H How to Estimate the Cost of an LLM API Call To estimate LLM API cost, enter the number of input tokens and output tokens… H How to Estimate the Token Count of a Prompt To estimate tokens, paste your text into the Token Counter to get character-based and… H How to Find and Replace Text Online To find and replace text, paste your text, enter what to find and what… H How to Find the GCF and LCM of Two Numbers To find the greatest common factor and least common multiple, enter two whole numbers… H How to Find Your Public IP Address To find your public IP address, open the What Is My IP tool and… H How to Format and Validate XML To format XML, paste it into the XML Formatter, which checks that it is… H How to Format, Beautify or Minify JSON To format JSON, paste it into the JSON Formatter, choose an indent size and… H How to Generate a Strong Password To generate a strong password, choose a length of at least 14 to 16… H How to Generate Random Numbers in a Range To generate random numbers with this random number generator, enter a minimum and maximum,… H How to Merge PDF Files Into One To merge PDFs, open the Merge PDF tool, add two or more files, arrange… H How to Pick Random Winners or Split a List into Teams To pick random names, paste a list into the Random Team/Name Picker, a simple… H How to Preview Your Title and Meta Description in Google To preview a search result with this SERP preview tool, enter your page title… H How to Remove Duplicate Lines from a List To remove duplicate lines, paste your list into the Duplicate Line Remover, choose whether… H How to Remove Extra Spaces from Text To remove extra spaces, paste your text into the Remove Extra Spaces tool and… H How to Remove Line Breaks from Text To remove line breaks, paste your text into the Remove Line Breaks tool and… H How to Resize an Image Without Uploading It To resize an image, open the Image Resizer, choose your file and enter a… H How to Rotate or Flip an Image To rotate an image online, open the Image Rotator, choose your file and pick… H How to Rotate PDF Pages To rotate a PDF, open the Rotate PDF tool, choose the file and pick… H How to Simplify Ratios and Solve Proportions To simplify a ratio, enter its two parts into the Ratio Calculator and it… H How to Solve a Quadratic Equation To solve ax squared plus bx plus c equals 0, enter a, b and… H How to Sort Lines Alphabetically or by Length To sort lines, paste your list into the Sort Lines tool and choose A… H How to Split a PDF and Extract Pages To extract pages from a PDF, open the Split PDF tool, choose your file… H How to URL Encode and Decode Text To URL encode text, paste it into the URL Encode/Decode tool and choose encode;… H How to Use a Caesar Cipher and ROT13 To use a Caesar cipher, paste your text, choose a shift from 1 to… H How to Validate JSON and Find Errors To validate JSON, paste it into the JSON Validator. It tells you whether the… H How to View and Edit PDF Metadata To edit PDF metadata, open the PDF Metadata Viewer / Editor, choose your file… H How to View and Remove EXIF Data from a Photo To see EXIF data, open the EXIF Viewer and choose a JPEG; it lists… H How to Write a Clean Professional Email Signature To create an email signature, enter your name, title and contact details into the… H How to Write Titles in AP, Chicago, MLA and APA Title Case To convert a headline to title case, paste it into the Title Case Converter… M Margin vs Markup: How to Calculate Both Margin is profit as a percentage of the selling price, while markup is profit…