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Unit converters, math calculators, and everyday generators.

XML to JSON Converter: Parse XML into JSON and backOctober 1, 2026 · 3 min read · Use the free XML to JSON Converter to parse XML into JSON and back.Weight Converter: Convert mass units like kilograms, pounds, ounces, and gramsOctober 1, 2026 · 3 min read · Use the free Weight Converter to convert mass units like kilograms, pounds, ounces, and grams.Volume Converter: Convert liters, gallons, cups, milliliters, and other volume unitsOctober 1, 2026 · 3 min read · Use the free Volume Converter to convert liters, gallons, cups, milliliters, and other volume units.vCard Generator: Generate a downloadable .vcf contact card for phones and email clientsOctober 1, 2026 · 3 min read · Use the free vCard Generator to generate a downloadable .vcf contact card for phones and email clients.VAT / GST Calculator: Add or extract VAT and GST from any amount with a custom tax rateOctober 1, 2026 · 3 min read · Use the free VAT / GST Calculator to add or extract VAT and GST from any amount with a custom tax rate.Time Zone Converter: Convert a time between different world time zonesOctober 1, 2026 · 3 min read · Use the free Time Zone Converter to convert a time between different world time zones.Time Duration Calculator: Measure elapsed time between two date-times in multiple unitsOctober 1, 2026 · 3 min read · Use the free Time Duration Calculator to measure elapsed time between two date-times in multiple units.Time Converter: Convert seconds, minutes, hours, days, weeks, and yearsOctober 1, 2026 · 3 min read · Use the free Time Converter to convert seconds, minutes, hours, days, weeks, and years.Temperature Converter: Convert between Celsius, Fahrenheit, and KelvinOctober 1, 2026 · 3 min read · Use the free Temperature Converter to convert between Celsius, Fahrenheit, and Kelvin.Tasbih Counter: Digital Tasbih counter for dhikr and Islamic remembranceOctober 1, 2026 · 3 min read · The Tasbih Counter is a free online tool: digital Tasbih counter for dhikr and Islamic remembrance.Standard Deviation Calculator: Compute mean, variance, and standard deviation for a data setOctober 1, 2026 · 3 min read · Use the free Standard Deviation Calculator to compute mean, variance, and standard deviation for a data set.SQL to JSON Converter: Convert SQL INSERT statements into JSON or CSVOctober 1, 2026 · 3 min read · Use the free SQL to JSON Converter to convert SQL INSERT statements into JSON or CSV.Speed Converter: Convert mph, km/h, m/s, knots, and other speed unitsOctober 1, 2026 · 3 min read · Use the free Speed Converter to convert mph, km/h, m/s, knots, and other speed units.Shoe Size Converter: Convert shoe sizes between US, UK, EU, and centimetersOctober 1, 2026 · 3 min read · Use the free Shoe Size Converter to convert shoe sizes between US, UK, EU, and centimeters.Scientific Calculator: Full-function calculator with trig, logs, exponents, and constantsOctober 1, 2026 · 3 min read · The Scientific Calculator is a free online tool: full-function calculator with trig, logs, exponents, and constants.Roman Numeral Converter: Convert numbers to Roman numerals and backOctober 1, 2026 · 3 min read · Use the free Roman Numeral Converter to convert numbers to Roman numerals and back.Ring Size Converter: Convert ring sizes across US, UK, EU, and diameter chartsOctober 1, 2026 · 3 min read · Use the free Ring Size Converter to convert ring sizes across US, UK, EU, and diameter charts.Random String Generator: Generate random strings and API tokens with custom charsetsOctober 1, 2026 · 3 min read · Use the free Random String Generator to generate random strings and API tokens with custom charsets.Random Number Generator: Generate random numbers within a custom range with optionsOctober 1, 2026 · 3 min read · Use the free Random Number Generator to generate random numbers within a custom range with options.Profit Margin Calculator: Calculate profit, profit margin %, and markup from cost and selling priceOctober 1, 2026 · 3 min read · Use the free Profit Margin Calculator to calculate profit, profit margin %, and markup from cost and selling price.Pressure Converter: Convert pascals, bar, psi, atm, and mmHgOctober 1, 2026 · 3 min read · Use the free Pressure Converter to convert pascals, bar, psi, atm, and mmHg.Power Converter: Convert watts, kilowatts, horsepower, and BTU/hourOctober 1, 2026 · 3 min read · Use the free Power Converter to convert watts, kilowatts, horsepower, and BTU/hour.Pomodoro Timer: Free focus timer with 25-minute Pomodoros, short/long breaks, task label, and optional alertsOctober 1, 2026 · 3 min read · The Pomodoro Timer is a free online tool: free focus timer with 25-minute Pomodoros, short/long breaks, task label, and optional alerts.Percentage Calculator: Find percentages, percentage change, and what percent one number is of anotherOctober 1, 2026 · 3 min read · Use the free Percentage Calculator to find percentages, percentage change, and what percent one number is of another.Number to Words Converter: Spell out numbers in words for checks and documentsOctober 1, 2026 · 3 min read · Use the free Number to Words Converter to spell out numbers in words for checks and documents.Markdown to HTML Converter: Render Markdown into HTML with live previewOctober 1, 2026 · 3 min read · Use the free Markdown to HTML Converter to render Markdown into HTML with live preview.Liters to Gallons Converter: Dedicated converter between liters and US/UK gallonsOctober 1, 2026 · 3 min read · The Liters to Gallons Converter is a free online tool: dedicated converter between liters and US/UK gallons.List Randomizer: Shuffle or pick random items from a pasted listOctober 1, 2026 · 3 min read · Use the free List Randomizer to shuffle or pick random items from a pasted list.Length Converter: Convert between meters, feet, miles, kilometers, inches, and moreOctober 1, 2026 · 3 min read · Use the free Length Converter to convert between meters, feet, miles, kilometers, inches, and more.KG to Lbs Converter: Dedicated converter between kilograms and poundsOctober 1, 2026 · 3 min read · The KG to Lbs Converter is a free online tool: dedicated converter between kilograms and pounds.JSON to XML Converter: Convert JSON data structures into XMLOctober 1, 2026 · 3 min read · Use the free JSON to XML Converter to convert JSON data structures into XML.JSON to TypeScript: Generate TypeScript interfaces from a JSON sampleOctober 1, 2026 · 3 min read · Use the free JSON to TypeScript to generate TypeScript interfaces from a JSON sample.Invoice Generator: Create professional PDF invoices with line items, tax, and instant download — no watermarkOctober 1, 2026 · 3 min read · Use the free Invoice Generator to create professional PDF invoices with line items, tax, and instant download — no watermark.Inches to CM Converter: Dedicated converter between inches and centimetersOctober 1, 2026 · 3 min read · The Inches to CM Converter is a free online tool: dedicated converter between inches and centimeters.Ideal Weight Calculator: Suggest a healthy weight range based on height, age, and genderOctober 1, 2026 · 3 min read · Use the free Ideal Weight Calculator to suggest a healthy weight range based on height, age, and gender.ICS Calendar Generator: Build a .ics calendar event file for Google Calendar, Outlook, and Apple CalendarOctober 1, 2026 · 3 min read · Use the free ICS Calendar Generator to build a .ics calendar event file for Google Calendar, Outlook, and Apple Calendar.IBAN Validator: Validate IBAN numbers for Pakistan, EU, UK and 80+ countries with mod-97 checksumOctober 1, 2026 · 3 min read · Use the free IBAN Validator to validate IBAN numbers for Pakistan, EU, UK and 80+ countries with mod-97 checksum.HTML to Markdown Converter: Convert HTML markup into clean MarkdownOctober 1, 2026 · 3 min read · Use the free HTML to Markdown Converter to convert HTML markup into clean Markdown.Hours Calculator: Calculate total hours and minutes between two times for timesheetsOctober 1, 2026 · 3 min read · Use the free Hours Calculator to calculate total hours and minutes between two times for timesheets.Hash Generator (MD5 / SHA): Compute MD5, SHA-1, and SHA-256 hashes of textOctober 1, 2026 · 3 min read · Use the free Hash Generator (MD5 / SHA) to compute MD5, SHA-1, and SHA-256 hashes of text.Grade Calculator: Calculate final or weighted grades and the score needed to passOctober 1, 2026 · 3 min read · Use the free Grade Calculator to calculate final or weighted grades and the score needed to pass.GPA Calculator: Compute grade point average from course grades and credit hoursOctober 1, 2026 · 3 min read · Use the free GPA Calculator to compute grade point average from course grades and credit hours.Fuel Consumption Converter: Convert MPG, km/L, and L/100km fuel economy unitsOctober 1, 2026 · 3 min read · Use the free Fuel Consumption Converter to convert MPG, km/L, and L/100km fuel economy units.Frequency Converter: Convert hertz, kilohertz, megahertz, and gigahertzOctober 1, 2026 · 3 min read · Use the free Frequency Converter to convert hertz, kilohertz, megahertz, and gigahertz.Fraction Calculator: Add, subtract, multiply, and simplify fractionsOctober 1, 2026 · 3 min read · Use the free Fraction Calculator to add, subtract, multiply, and simplify fractions.Force Converter: Convert newtons, pounds-force, kilogram-force, and dynesOctober 1, 2026 · 3 min read · Use the free Force Converter to convert newtons, pounds-force, kilogram-force, and dynes.Energy Converter: Convert joules, calories, kilowatt-hours, and BTUOctober 1, 2026 · 3 min read · Use the free Energy Converter to convert joules, calories, kilowatt-hours, and BTU.Email Signature Generator: Create a professional HTML email signature with name, title, contact, and brand colorOctober 1, 2026 · 3 min read · Use the free Email Signature Generator to create a professional HTML email signature with name, title, contact, and brand color.Density Converter: Convert kg/m3, g/cm3, lb/ft3, and other density unitsOctober 1, 2026 · 3 min read · Use the free Density Converter to convert kg/m3, g/cm3, lb/ft3, and other density units.Decision Wheel: Spin a colorful wheel to pick randomly from your list — lunch, chores, team decisions, and moreOctober 1, 2026 · 4 min read · Use the free Decision Wheel to spin a colorful wheel to pick randomly from your list — lunch, chores, team decisions, and more.Date Calculator: Add or subtract days from a date and find the span between two datesOctober 1, 2026 · 3 min read · Use the free Date Calculator to add or subtract days from a date and find the span between two dates.Data Transfer Rate Converter: Convert bps, Kbps, Mbps, Gbps, and MB/sOctober 1, 2026 · 3 min read · Use the free Data Transfer Rate Converter to convert bps, Kbps, Mbps, Gbps, and MB/s.Data Storage Converter: Convert bytes, kilobytes, megabytes, gigabytes, and terabytesOctober 1, 2026 · 3 min read · Use the free Data Storage Converter to convert bytes, kilobytes, megabytes, gigabytes, and terabytes.Currency Converter: Convert between USD, EUR, PKR, INR, AED and more with live mid-market ratesOctober 1, 2026 · 3 min read · Use the free Currency Converter to convert between USD, EUR, PKR, INR, AED and more with live mid-market rates.CSV to TSV Converter: Convert CSV to TSV and Excel-friendly formatsOctober 1, 2026 · 3 min read · Use the free CSV to TSV Converter to convert CSV to TSV and Excel-friendly formats.Countdown Calculator: Count down the days, hours, and minutes until any target dateOctober 1, 2026 · 3 min read · Use the free Countdown Calculator to count down the days, hours, and minutes until any target date.Cooking Measurement Converter: Convert cups, tablespoons, teaspoons, grams, and ounces for recipesOctober 1, 2026 · 3 min read · Use the free Cooking Measurement Converter to convert cups, tablespoons, teaspoons, grams, and ounces for recipes.Color Converter (HEX / RGB / HSL): Convert colors between HEX, RGB, HSL, and HSVOctober 1, 2026 · 4 min read · Use the free Color Converter (HEX / RGB / HSL) to convert colors between HEX, RGB, HSL, and HSV.Code Minifier: Minify HTML, CSS, and JavaScript to reduce file sizeOctober 1, 2026 · 3 min read · Use the free Code Minifier to minify HTML, CSS, and JavaScript to reduce file size.Clothing Size Converter: Convert clothing sizes across US, UK, EU, and international chartsOctober 1, 2026 · 3 min read · Use the free Clothing Size Converter to convert clothing sizes across US, UK, EU, and international charts.Bra Size Converter: Convert bra sizes between US, UK, EU, and FR systemsOctober 1, 2026 · 3 min read · Use the free Bra Size Converter to convert bra sizes between US, UK, EU, and FR systems.Binary to Decimal Converter: Convert numbers between binary, decimal, hex, and octalOctober 1, 2026 · 3 min read · Use the free Binary to Decimal Converter to convert numbers between binary, decimal, hex, and octal.Barcode Generator: Create barcodes in formats like Code128, EAN, and UPCOctober 1, 2026 · 3 min read · Use the free Barcode Generator to create barcodes in formats like Code128, EAN, and UPC.Area Converter: Convert square meters, acres, hectares, square feet, and moreOctober 1, 2026 · 3 min read · Use the free Area Converter to convert square meters, acres, hectares, square feet, and more.Angle Converter: Convert degrees, radians, gradians, and arcminutesOctober 1, 2026 · 3 min read · Use the free Angle Converter to convert degrees, radians, gradians, and arcminutes.Afghan Date Converter: Convert Shamsi (Solar Hijri) dates to Gregorian and backOctober 1, 2026 · 3 min read · Use the free Afghan Date Converter to convert Shamsi (Solar Hijri) dates to Gregorian and back.

How to use 542+ tools on this site

Each tool is a separate page. The title is the task, the sentence under the title is the scope, and the form is the product. Type the text, choose the file, or enter the numbers you already have. The result stays on that page. You can change one field and compare a second case without starting over.

480 tools run in the browser. The file or the figures stay on your device, which is why those pages are marked private. They work without an account. AI writers and handwriting OCR send the input to a server so a model can run, and the page says so. The free plan includes a small daily limit for those server tools. Pro removes the limit. Do not paste passwords or account numbers into a server tool.

Search from the header when you know the tool name. Open a category when you only know the kind of job. Calculator pages are estimates: a payment, a yard of concrete, or a calorie figure is only as good as the rate, the unit, and the date you typed. PDF and image pages follow the file you upload. If the page never mentions a rule that applies to your bank, school, clinic, or city, treat the output as a draft and check the source that actually governs the decision.

Read the notes under the form before you rely on a number. They repeat the scope, the steps, and the questions people ask. Related tools sit at the bottom when the next step is a different calculation or a different file. The categories below are the whole library.

AI-Powered Tools. AI assistants for developers and job seekers — explain code, generate SQL, write cover letters and interview answers, check résumés for ATS, debug errors, commits, PRs, docs and tests. AI assistants for developers & job seekers. Open that category and read the line under each tool name before you click. The line is the job the tool actually does.

Handwriting OCR. AI-powered handwriting tools — OCR in 30+ languages, form & table extractors, math to LaTeX, Markdown conversion, and note summarizers. Upload a photo and get editable digital text. OCR, forms, tables, math & notes. Open that category and read the line under each tool name before you click. The line is the job the tool actually does.

Freelancer Tools. Free client-side tools for freelancers — contracts, proposals, NDAs, rate calculators, quotes, and change orders. No signup, no subscription. Contracts, rates & client docs — free. Open that category and read the line under each tool name before you click. The line is the job the tool actually does.

DevOps Tools. Client-side generators and validators for infrastructure, CI/CD and networking — configs, manifests and scripts you can copy straight into your project. Configs, manifests & scripts. Open that category and read the line under each tool name before you click. The line is the job the tool actually does.

Health & Fitness. Free health and fitness calculators — hydration, macros, heart-rate zones, training and more. Instant, private and running entirely in your browser. Fitness, nutrition & wellbeing. Open that category and read the line under each tool name before you click. The line is the job the tool actually does.

Text Tools. Browser-based utilities for counting, converting, cleaning, and transforming text. Write, clean & transform text. Open that category and read the line under each tool name before you click. The line is the job the tool actually does.

Developer Tools. Client-side coding utilities for formatting, converting, encoding and inspecting data. Format, convert & debug code. Open that category and read the line under each tool name before you click. The line is the job the tool actually does.

Security & Password Tools. Privacy-first, in-browser tools for passwords, hashing, encryption and key generation. Passwords, hashing & crypto. Open that category and read the line under each tool name before you click. The line is the job the tool actually does.

PDF Tools. Browser-based tools to merge, split, convert, compress, and edit PDF files. Merge, split & convert PDFs. Open that category and read the line under each tool name before you click. The line is the job the tool actually does.

Image Tools. Browser-based tools to convert, resize, compress, crop, and edit images. Resize, compress & convert images. Open that category and read the line under each tool name before you click. The line is the job the tool actually does.

Color Tools. Browser-based color pickers, converters, palette and gradient generators. Pick, convert & build palettes. Open that category and read the line under each tool name before you click. The line is the job the tool actually does.

Calculators. Financial, health, math, date and everyday calculators that run entirely in the browser. Finance, health & math. Open that category and read the line under each tool name before you click. The line is the job the tool actually does.

Unit Converters. Instant client-side converters for length, weight, volume, temperature, and other measurement units. Convert any unit instantly. Open that category and read the line under each tool name before you click. The line is the job the tool actually does.

SEO & Web Tools. Comprehensive SEO suite — keyword research, technical audits, content optimization, rank tracking, backlinks, internal linking, schema, and AI SEO workflows. Research, audits, schema & AI SEO. Open that category and read the line under each tool name before you click. The line is the job the tool actually does.

Social Media Tools. Client-side helpers for crafting, styling, and mocking up social media content and posts. Captions, fonts & mockups. Open that category and read the line under each tool name before you click. The line is the job the tool actually does.

Content Creator Tools. Free browser tools for YouTubers, podcasters & social creators — video editing, script extraction, voiceovers, captions & more. No signup for browser tools; AI script studio uses daily free runs. Video editor, script studio & voiceovers. Open that category and read the line under each tool name before you click. The line is the job the tool actually does.

Converters & Generators. Client-side data converters and utility generators for developers, students, and everyday users. Data converters & generators. Open that category and read the line under each tool name before you click. The line is the job the tool actually does.

Home & Trade Calculators. Free home, workshop, electrical, and property calculators — BTU, AC tonnage, lumber, deck, voltage drop, refinance, rental cash flow, and more. Runs in your browser. Home, workshop, electrical & property. Open that category and read the line under each tool name before you click. The line is the job the tool actually does.

Pick the tool whose description matches the input you have. If the description does not mention that input, it is the wrong page. Run the form, read the result next to the labels, and only then copy it into a document, a message, or a spreadsheet.

How to read a result

A calculator answers the question printed on the page. A mortgage page returns principal, interest, tax, and insurance when you enter those amounts. It does not know your lender’s fees, your credit score, or a rate that changes next month. Change the rate, the term, or the down payment and read the new payment next to the old one before you decide. The same habit works for a loan, a retirement contribution, a paint job, or a calorie target: one input at a time, then the line that moved.

Units are part of the answer. A length converter shows both sides of the pair you picked. A concrete page asks for feet or metres because a yard of concrete is a volume, not a length. If the label says per month, do not type a yearly figure in that box. Dates matter on age, pregnancy, countdown, and interest pages: the day you enter is the day the formula uses. Round only after you have the full figure, and keep the same rounding when you compare two cases.

File tools follow the file. A PDF merge keeps page order as you arranged the files. Split and extract keep the pages you selected. Compress makes the file smaller and can soften images inside it. Rotate, crop, watermark, and page numbers change the pages you see, not the words in a scanned image unless the page says it runs OCR. An image resizer changes pixels. A format converter changes the container. Download the result and open it before you send it. If the preview looks wrong, the source file is still on your device and you can run the tool again.

Text tools work on the text in the box. A counter reports words, characters, and sentences for that box only. Case, find-and-replace, and duplicate-line tools rewrite that box. They do not open a document on your computer until you paste. JSON, CSV, and code formatters expect valid input; an error line means the text is not in the shape the tool described. Fix the text or pick the converter that matches the format you actually have.

Search opens a list of every tool name and its one-line description. Type the job, not a slogan: mortgage, merge pdf, word counter, bmi. The match is the name and the description, so a short specific phrase finds the page faster than a long sentence. Category menus are the same library grouped by the kind of work. A tool that is not built yet is marked soon and does not pretend to calculate.

The guide under each tool is the place to check limits. It names the inputs, what the formula leaves out, and the questions people ask before they use the number. Related links are the next tool when the job continues, such as a payment after a loan amount, or a JPG after a PDF page. The blog explains one job in a longer article and links to the tool that does the work. Use the article when you want the reasoning, and the tool when you already have the figures.

Browser tools need a current browser and JavaScript. A very large PDF or image can be slow because it is processed on your machine. Server tools need a connection and count toward the free daily limit. Create an account only if you want that limit lifted. The result on a private page is not stored by the site. Copy what you need, then close the tab if the file was sensitive.