60 free tools · No sign-up · Private
Free online tools that just work
Calculators, PDF, image and text tools that are fast, accurate and private. Everything runs right in your browser.
Most used
Popular tools
Mortgage Calculator
See your true monthly house payment, including taxes, insurance, PMI and HOA fees, with a year-by-year amortization schedule.
Image Compressor
Shrink image file sizes by up to 90% without visible quality loss. Batch-compress in your browser with no uploads.
Paycheck Calculator
Estimate your take-home pay after federal tax, FICA, state tax and pre-tax deductions, per paycheck and per year.
Visa-Free Countries Checker
Pick your passport to see where you can travel without a visa, or check one destination instantly.
HEIC to JPG
Convert iPhone HEIC photos to JPG so they open on any device or website. Nothing is uploaded.
Loan Calculator
Calculate the monthly payment and total interest for any personal, auto or student loan.
Auto Loan Calculator
Estimate your monthly car payment with sales tax, fees, down payment and trade-in, and see the real total cost.
Merge PDF
Combine multiple PDFs into one file in the order you want. Files never leave your device.
Finance Calculators
Plan big money decisions with clear numbers: payments, take-home pay, interest and full schedules.
Mortgage Calculator
See your true monthly house payment, including taxes, insurance, PMI and HOA fees, with a year-by-year amortization schedule.
Paycheck Calculator
Estimate your take-home pay after federal tax, FICA, state tax and pre-tax deductions, per paycheck and per year.
Loan Calculator
Calculate the monthly payment and total interest for any personal, auto or student loan.
Auto Loan Calculator
Estimate your monthly car payment with sales tax, fees, down payment and trade-in, and see the real total cost.
Retirement Calculator
See how much your 401(k) or retirement savings could grow, including your employer match.
Zakat Calculator
Work out the zakat you owe with live gold and silver prices for the nisab, in your own currency.
Compound Interest Calculator
See how your money grows over time with compound interest and regular contributions.
Credit Card Payoff Calculator
See how long it takes to become debt-free and how much interest you save by paying more each month.
Everyday Calculators
Fast answers for everyday math: percentages, dates, grades, tips and health.
Percentage Calculator
Three percentage calculators in one: percent of a number, percent ratio and percent change.
Tip Calculator
Work out the tip, total and each person's share in seconds.
Namaz & Qaza Calculator
Count every prayer since the age of obligation, including Jumu'ah, both Eids and Ramadan fasts, and plan your qaza prayers.
GPA Calculator
Add your courses, grades and credit hours to calculate your GPA on a 4.0 scale, including cumulative GPA.
Date Calculator
Count the days between two dates or add and subtract days, weeks and months from any date.
Calorie Calculator
Estimate how many calories you burn per day and how much to eat to lose, maintain or gain weight.
Age Calculator
Find an exact age in years, months and days, plus a countdown to the next birthday.
BMI Calculator
Calculate body mass index in imperial or metric units and see your healthy weight range.
Unit Converters
Instant, accurate conversions with handy reference tables.
Unit Converter
Convert length, weight, temperature, volume, area and speed between metric and imperial units.
CM to Inches
Type a value to convert instantly. A full conversion chart is below.
KG to LBS
Type a value to convert instantly. A full conversion chart is below.
Fahrenheit to Celsius
Type a value to convert instantly. A full conversion chart is below.
Miles to KM
Type a value to convert instantly. A full conversion chart is below.
Travel & Visa
Plan trips and moves abroad: visa-free destinations, passport power, Schengen days and citizenship rules.
Visa-Free Countries Checker
Pick your passport to see where you can travel without a visa, or check one destination instantly.
Passport Ranking
All 199 passports ranked by how many destinations they can visit without applying for a visa in advance.
Currency Converter
Convert between 30 major currencies using daily reference rates from the European Central Bank.
Citizenship Eligibility Checker
Answer a few questions to see which citizenships you may qualify for through residence, marriage or ancestry.
Schengen 90/180 Calculator
Add your Schengen trips to see days used, days left and the longest stay possible on your next visit.
Compare Passports
Compare two passports side by side and see exactly where each one gives easier access.
Time Zone Converter
Convert a time between cities and time zones. Daylight saving time is handled automatically.
Dual Citizenship Checker
Check whether you could hold citizenship of two countries at the same time.
Study Abroad
Find universities, convert grades and test scores, and estimate the real cost of studying abroad.
University Finder
Search more than 10,000 universities worldwide by name or country and go straight to their official website.
GPA Converter
Convert your grades from any scale to an estimated US 4.0 GPA and the German grade used by German universities.
IELTS / TOEFL / PTE Converter
Convert scores between IELTS, TOEFL iBT, PTE Academic and the Duolingo English Test, with CEFR levels.
Study Abroad Cost Calculator
Estimate the real total cost of studying abroad: tuition, rent and living costs, visa and travel.
Environment
Measure the CO₂ of your car, flights and digital life, using official emission factors.
Car CO₂ Emissions Calculator
Find out how much CO₂ your car emits each year, and how petrol, diesel, hybrid and electric cars compare.
Flight Carbon Calculator
Calculate the CO₂ of your flight by route, cabin class and aircraft type, and see how it compares.
Digital Carbon Footprint
See the carbon footprint of your searches, AI prompts, emails, streaming and video calls, per activity and per year.
Image Tools
Compress, resize and convert images in seconds. Everything runs in your browser, so nothing is uploaded.
Image Compressor
Shrink image file sizes by up to 90% without visible quality loss. Batch-compress in your browser with no uploads.
HEIC to JPG
Convert iPhone HEIC photos to JPG so they open on any device or website. Nothing is uploaded.
Resize Image
Change the width and height of your images in pixels. Aspect ratio is kept automatically.
PNG to JPG
Convert PNG images to JPG instantly. Drop as many files as you like; nothing is uploaded.
JPG to PNG
Convert JPG images to PNG instantly. Drop as many files as you like; nothing is uploaded.
WebP to JPG
Convert WebP images to JPG instantly. Drop as many files as you like; nothing is uploaded.
WebP to PNG
Convert WebP images to PNG instantly. Drop as many files as you like; nothing is uploaded.
PNG to WebP
Convert PNG images to WebP instantly. Drop as many files as you like; nothing is uploaded.
PDF Tools
Work with PDF files privately in your browser. No uploads, no watermarks, no sign-up.
Merge PDF
Combine multiple PDFs into one file in the order you want. Files never leave your device.
Compress PDF
Shrink large PDFs, especially scanned documents, so they fit email and upload limits. Files never leave your device.
JPG to PDF
Turn photos and scans into a single PDF. Reorder pages, pick a page size and download, all in your browser.
PDF to JPG
Convert each page of a PDF into a high-quality JPG or PNG image. Your file is never uploaded.
Split PDF
Extract the pages you need or split a PDF into separate files. Nothing is uploaded.
Text Tools
Handy tools for writers, students and marketers.
Word Counter
Count words, characters, sentences and paragraphs as you type, with reading time and keyword density.
Character Counter
Count characters with and without spaces and check your text against popular limits as you type.
Case Converter
Change text to UPPERCASE, lowercase, Title Case, Sentence case and more in one click.
Utility Tools
Everyday utilities that save time: QR codes, strong passwords and more.
QR Code Generator
Create QR codes for links, Wi-Fi, text, email and phone numbers. Free forever, and codes never expire.
Which Phone Should I Buy?
Set your budget and must-haves, tell us what matters most, and get the best-matching phones with a side-by-side comparison.
Password Generator
Create strong, random passwords with cryptographic randomness, generated on your device and never sent anywhere.
Random Number Generator
Generate truly random numbers in any range, pick multiple without repeats, flip a coin or roll dice.
Developer Tools
Fast, private tools for developers. Your data never leaves the browser.
JSON Formatter
Format, validate and minify JSON instantly. Errors point to the exact line and column.
Base64 Encode / Decode
Encode text or files to Base64, or decode Base64 back to readable text. UTF-8 and URL-safe supported.
Why people choose ToolKnack
Private by design
Files are processed right in your browser. Your photos, PDFs and numbers never touch our servers.
Instant results
No uploads, no queues, no waiting. Pages load in a blink and tools respond as you type.
Free, no strings
No sign-up, no watermarks, no daily limits. Just open a tool and get it done.