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A Add Page Numbers to PDF PDF Tools Add page numbers to every page of a PDF, with a choice… A Age Calculator Date & Time Calculate exact age in years, months, and days from a date of… A Area Converter Unit Converters Convert between square millimeters, square centimeters, square meters, square kilometers, square feet,… A Average/Mean/Median/Mode Calculator Math Calculators Paste a list of numbers to get the mean, median, mode, range,… B Bandwidth / Download Time Calculator Network Tools Estimate how long a file will take to download at a given… B Base32/Base58 Encode/Decode Encoding & Security Encode text to Base32 or Base58 and decode it back, with correct… B Base64 Encode/Decode Developer Tools Encode text to Base64 or decode it back, with correct handling of… B BMI Calculator Health & Fitness Calculate Body Mass Index from your weight and height, with the WHO… B BMR/TDEE Calculator Health & Fitness Calculate your Basal Metabolic Rate and Total Daily Energy Expenditure using the… B Box-Shadow Generator Color & CSS Build a CSS box-shadow from offset, blur, spread, and color, with an… C Caesar Cipher / ROT13 Encoding & Security Encode or decode text with a Caesar cipher (including the classic ROT13… C Case Converter Text Tools Convert text between UPPERCASE, lowercase, Sentence case, Title Case, and more —… C Character Counter Text Tools Count characters, with and without spaces, and check your text against platform… C Character Counter for Ads Business Tools Check your ad copy's character count against Google Ads and Meta Ads… C Color Converter Color & CSS Convert a HEX color code to its RGB and HSL equivalents —… D Data Storage Converter Unit Converters Convert between bytes, kilobytes, megabytes, gigabytes, and terabytes — decimal (KB/MB/GB, what… D Date Add/Subtract Calculator Date & Time Add or subtract days, months, or years from a date — instantly,… D Date Difference Calculator Date & Time Calculate the number of days (and weeks) between two dates — instantly,… D Discount / Sale Price Calculator Finance Calculate the final price and total savings for any percentage discount —… D Duplicate Line Remover Text Tools Remove duplicate lines from a list, with case-insensitive and whitespace-trim options and… E Email Signature Generator Business Tools Generate a clean plain-text email signature block from your name, title, and… E Employee Timesheet Calculator Business Tools Calculate total, regular, and overtime hours from a list of clock-in/clock-out shifts… E EXIF Viewer / Remover Image Tools See what metadata a JPEG photo actually contains — camera, capture date,… F FAQ Schema Generator SEO Tools Generate valid FAQPage JSON-LD structured data from up to 3 question-and-answer pairs,… F Favicon Generator Image Tools Generate a real multi-size favicon.ico from an image, ready to drop into… F Find & Replace Text Tools Find every occurrence of a word or pattern in your text and… F Fraction ↔ Decimal Converter Math Calculators Convert a fraction to a decimal or a terminating decimal back to… F Fraction Calculator Math Calculators Add, subtract, multiply, or divide two fractions, with the result automatically simplified… G GCF / LCM Calculator Math Calculators Find the greatest common factor and least common multiple of two whole… G GPA Calculator Education Calculate your credit-hour-weighted GPA on the standard 4.0 scale from a list… G Grade Calculator Education Find out what score you need on your final exam to reach… G Gradient Generator Color & CSS Build a CSS linear-gradient from two colors and an angle, ready to… H Height Converter Unit Converters Convert height between feet & inches and centimeters, entered the way people… H HTML Entity Encoder/Decoder Developer Tools Encode special characters to HTML entities, or decode HTML entities back to… I Ideal Weight Calculator Health & Fitness Compare three established formulas for estimating ideal body weight (Devine, Robinson, Miller)… I Image Compressor Image Tools Reduce an image's file size by adjusting JPEG/WebP quality, with the size… I Image Converter Image Tools Convert an image between PNG, JPG, and WebP — entirely in your… I Image Cropper Image Tools Crop an image to an exact pixel rectangle — entirely in your… I Image Resizer Image Tools Resize an image to a target width, with the aspect ratio preserved… I Image Rotator / Flipper Image Tools Rotate an image by 90, 180, or 270 degrees, and flip it… I Image to Base64 Image Tools Convert an image to a Base64 data URL you can paste directly… I Images to PDF PDF Tools Combine PNG or JPG images into a single PDF, one image per… I IP Address Converter Network Tools Convert an IPv4 address between dotted decimal, binary, hexadecimal, and 32-bit decimal… J JSON ↔ CSV Converter Developer Tools Convert a flat array of JSON objects to CSV, or CSV back… J JSON Escape/Unescape Developer Tools Escape a raw string for embedding inside a JSON string literal, or… J JSON Formatter Developer Tools Beautify or minify JSON, with adjustable indent and optional alphabetical key sorting… J JSON Validator Developer Tools Check whether your JSON is valid, with the exact line and column… L Length Converter Unit Converters Convert between millimeters, centimeters, meters, kilometers, inches, feet, yards, and miles —… L LLM Cost Calculator AI Utilities Estimate the cost of an LLM API call from input and output… M Margin/Markup Calculator Finance Calculate margin (profit as a % of selling price) and markup (profit… M Merge PDF PDF Tools Combine two or more PDFs into a single file, in the order… O Open Graph / Twitter Card Generator SEO Tools Generate the Open Graph and Twitter Card meta tags for a page,… P Pace Calculator Health & Fitness Calculate your running pace per kilometer and per mile from a total… P Password Generator Encoding & Security Generate strong, random passwords with your choice of character types and length,… P PDF Metadata Viewer / Editor PDF Tools View and edit a PDF's title, author, subject, and keywords — entirely… P PDF Page Deleter / Reorderer PDF Tools Delete or reorder the pages in a PDF by listing the pages… P Percentage Calculator Math Calculators Calculate X% of Y, what percent X is of Y, or the… P Prompt Template Builder AI Utilities Fill in {{placeholder}} variables in a prompt template to generate the final… Q Quadratic Equation Solver Math Calculators Solve ax² + bx + c = 0 for x, with the… R Random Number Generator Encoding & Security Generate random whole numbers in a range you choose, one at a… R Random Team/Name Picker Business Tools Pick random winners from a list of names, or shuffle a list… R Ratio Calculator Math Calculators Simplify a ratio to lowest terms, or solve a proportion A:B =… R Remove Extra Spaces Text Tools Clean up text pasted from PDFs, Word, or email — collapse repeated… R Remove Line Breaks Text Tools Remove or convert line breaks -- unwrap hard-wrapped text from PDFs and… R Robots.txt Generator SEO Tools Build a valid robots.txt file with allow/disallow rules and a sitemap reference… R Rotate PDF PDF Tools Rotate every page of a PDF by 90, 180, or 270 degrees… S Salary Converter (Hourly to Annual) Finance Convert between an hourly rate and an annual salary, with adjustable hours… S Scientific Notation Converter Education Convert a number between plain decimal and scientific notation — enter either… S SERP Preview SEO Tools Preview how your title and meta description will look in Google search… S Slug Generator Text Tools Convert titles into clean URL slugs -- lowercase, hyphenated, with accents transliterated… S Sort Lines Text Tools Sort lines A to Z, Z to A, by length, in natural… S Speed Converter Unit Converters Convert between meters per second, kilometers per hour, miles per hour, and… S Split PDF / Extract Pages PDF Tools Pull specific pages out of a PDF into a new file, using… S Standard Deviation Calculator Math Calculators Paste a list of numbers to get the standard deviation, variance, and… S Subnet Calculator (CIDR) Network Tools Calculate network address, broadcast address, subnet mask, and usable host range from… T Temperature Converter Unit Converters Convert between Celsius, Fahrenheit, and Kelvin, with the formula shown — instantly,… T Test Score / Percentage Grade Calculator Education Convert points earned out of points possible into a percentage and standard… T Text Diff Text Tools Compare two pieces of text and see exactly what changed — added,… T Time Zone Converter Date & Time Convert a date and time from one time zone to another, using… T Tip Calculator Finance Calculate the tip on a bill and split the total between any… T Title Case Converter Text Tools Convert headlines to title case under AP, Chicago, MLA, or APA rules… T Token Counter AI Utilities Estimate how many LLM tokens a piece of text will use, with… U URL Encode/Decode Developer Tools Encode or decode URLs and query-parameter values, with a choice between component… V Volume Converter Unit Converters Convert between milliliters, liters, teaspoons, tablespoons, cups, pints, quarts, and gallons —… W Watermark PDF PDF Tools Stamp a diagonal text watermark like "DRAFT" or "CONFIDENTIAL" across every page… W WCAG Contrast Checker Color & CSS Check the contrast ratio between a text color and a background color,… W Weight/Mass Converter Unit Converters Convert between milligrams, grams, kilograms, metric tons, ounces, and pounds — instantly,… W What Is My IP Network Tools See your public IP address, browser user agent, and screen resolution at… W Word Counter Text Tools Count words, characters, sentences, and paragraphs, with reading and speaking time —… X XML Formatter / Validator Developer Tools Check whether your XML is well-formed and re-indent it for readability —…

Free Online Tools for Designers Designers can convert colors, check contrast, generate gradients and shadows and prepare images with… Free Online Tools for Developers Developers can format and validate JSON, encode data, build CSS and check contrast without… Free Online Tools for SEO and Marketing Marketers can preview search snippets, create social sharing tags and structured data, check ad… Free Online Tools for Small Business Small businesses can calculate prices, margins, timesheets and salaries, tidy documents and images, and…