Free Calculators & Tools
79 free calculators and tools for money, health, maths, writing, code and files. No sign-up, no uploads, no personal data leaves your device — every tool runs entirely in your browser, and every result shows its working.
Most Popular Tools
The tools people use most — mortgage and salary calculators, PDF tools, image converters and more. Everything runs in your browser, free, with no sign-up.
Mortgage Calculator
Monthly payment with taxes, insurance, PMI and amortisation schedule.
Calculate →Merge PDF
Combine several PDFs into one, in your order.
Merge →JPG to PNG Converter
Convert JPG photos to lossless PNG images.
Convert →PNG to JPG Converter
Convert PNG images to smaller JPG files.
Convert →PDF to Text
Extract text from any PDF, copy or download as .txt.
Convert →Length Converter
cm to inches, mm, feet, yards, miles and more.
Convert →Salary Calculator
Hourly wage to annual, monthly, weekly and daily pay, with overtime.
Convert →Image Resizer
Resize and crop images to exact sizes, incl. social.
Resize →Resume Builder
Build a clean resume and download it as a PDF.
Build →QR Code Generator
QR codes for any link or text, downloadable as PNG.
Generate →Edit PDF Pages
Rotate, delete, reorder and extract PDF pages.
Edit →Paycheck Calculator
Take-home pay after federal tax, FICA and state.
Calculate →Finance Calculators
US money decisions: mortgage, salary, loans, retirement and savings.
Mortgage Calculator
Monthly payment with taxes, insurance, PMI and amortisation schedule.
Calculate →Salary Calculator
Hourly wage to annual, monthly, weekly and daily pay, with overtime.
Convert →Loan Calculator
Monthly EMI, total interest and total cost for personal, auto and home loans.
Calculate →Compound Interest Calculator
How savings grow over time with monthly contributions.
Calculate →Mortgage Affordability Calculator
How much house can you afford? Based on income, debts and the 28/36 rule.
Calculate →Auto Loan Calculator
Monthly car payment, total interest and total cost.
Calculate →Credit Card Payoff Calculator
Your debt-free date, total interest, snowball vs avalanche.
Calculate →Retirement Calculator
Project your 401(k) and retirement savings.
Calculate →Savings Calculator
Savings and CDs: future value with APY and monthly deposits.
Calculate →Percentage Calculator
Percentages, increases, decreases and discounts.
Calculate →Paycheck Calculator
Take-home pay after federal tax, FICA and state.
Calculate →Health Calculators
Everyday health numbers — general information only, not medical advice.
BMI Calculator
Body mass index from height and weight.
Calculate →Calorie Calculator
Daily calorie needs from BMR and activity level.
Calculate →Body Fat Calculator
Body fat percentage by the US Navy method.
Calculate →Pregnancy Due Date Calculator
Estimated due date, week and trimester.
Calculate →Tip Calculator
Tip, total and per-person share.
Calculate →Math & Date Calculators
Everyday maths and dates, exact and instant.
Scientific Calculator
Roots, powers, trigonometry, logs — with keyboard support.
Calculate →Fraction Calculator
Add, subtract, multiply and divide fractions.
Calculate →Average Calculator
Mean, median, mode, range and standard deviation.
Calculate →Age Calculator
Your exact age in years, months and days.
Calculate →Date Difference Calculator
Days, weeks and business days between dates.
Calculate →Time Zone Converter
Convert time between zones, with DST handled.
Convert →Length Converter
cm to inches, mm, feet, yards, miles and more.
Convert →Weight Converter
kg to lbs, grams, ounces and stone.
Convert →Temperature Converter
Celsius, Fahrenheit and Kelvin.
Convert →Data Converter
Bytes, KB, MB, GB and TB.
Convert →Text Tools
Writing helpers — your text never leaves your browser.
Word Counter
Words, characters, sentences and reading time, live.
Count →Case Converter
UPPERCASE, lowercase, Title Case, camelCase and more.
Convert →Text to Slug Generator
Clean, lowercase URL slugs from any title.
Generate →Lorem Ipsum Generator
Placeholder paragraphs for layouts and mockups.
Generate →Text Diff Checker
Compare two texts line by line.
Compare →Remove Duplicate Lines
Deduplicate any list, with optional sorting.
Clean →Readability Checker
Flesch Reading Ease and grade level.
Check →Text Summariser
Shorten long text to its most important sentences.
Summarise →Developer Tools
Fast, private tools for developers — data never leaves your browser.
JSON Formatter
Format, minify and validate JSON.
Format →Base64 Encoder
Encode and decode Base64 with UTF-8 support.
Encode →Regex Tester
Test regular expressions live, with highlighted matches.
Test →UUID Generator
Random UUID v4, one or ten at a time.
Generate →MD5 & SHA-256 Hash Generator
Hash any text with MD5 and SHA-256.
Hash →URL Encoder
Encode and decode URLs and components.
Encode →JWT Decoder
Decode a JWT header and payload. Decodes only.
Decode →Unix Timestamp Converter
Epoch timestamps to dates and back.
Convert →Color Picker
HEX to RGB and HSL, with WCAG contrast checks.
Pick →Decimal to Hex Converter
Decimal, hex, binary and octal — one input updates all.
Convert →JSON to CSV Converter
JSON array to CSV table, and CSV back to JSON.
Convert →Cron Explainer
Explain a cron expression and show next run times.
Explain →Markdown Editor
Write Markdown, preview HTML, export to PDF.
Edit →Colour Palette Generator
Extract a colour palette from any image.
Extract →File Hash Checker
Get SHA-256, SHA-1 and MD5 hashes of any file.
Check →Generators
Passwords, codes and SEO files — generated on your device.
Password Generator
Strong random passwords with a strength rating.
Generate →QR Code Generator
QR codes for any link or text, downloadable as PNG.
Generate →Barcode Generator
CODE128, CODE39 and EAN13 barcodes as SVG.
Generate →Meta Tag Generator
SEO title, description and social tags for any page.
Generate →Robots.txt Generator
A correct robots.txt with your sitemap.
Generate →XML Sitemap Generator
Build a valid XML sitemap from your URLs.
Generate →Resume Builder
Build a clean resume and download it as a PDF.
Build →Invoice Generator
Make a professional invoice and download a PDF.
Create →Favicon Generator
Make favicon and app icons from any image.
Generate →File Tools
Files stay private — everything is processed in your browser, never uploaded.
Merge PDF
Combine several PDFs into one, in your order.
Merge →Image to PDF
JPG and PNG images into a PDF, one per page.
Convert →PDF to Image
PDF pages into JPG or PNG images.
Convert →Image Compressor
Shrink photos by resizing and quality.
Compress →Compress PDF
Reduce a PDF's file size in your browser.
Compress →PDF to Text
Extract text from any PDF, copy or download as .txt.
Convert →Split PDF
Split a PDF by page ranges into separate files.
Split →JPG to PNG Converter
Convert JPG photos to lossless PNG images.
Convert →PNG to JPG Converter
Convert PNG images to smaller JPG files.
Convert →WebP to JPG Converter
Convert WebP images to JPG for wider compatibility.
Convert →JPG to WebP Converter
Convert JPG photos to smaller WebP images.
Convert →Edit PDF Pages
Rotate, delete, reorder and extract PDF pages.
Edit →Watermark PDF
Add a text watermark and page numbers to a PDF.
Add →Image Resizer
Resize and crop images to exact sizes, incl. social.
Resize →PDF to CSV
Extract tables from a PDF into a CSV file.
Convert →Image to Text
Read text from a photo or scan with OCR.
Extract →Sign PDF
Draw your signature and place it on a PDF.
Sign →Background Remover
Remove the background from a photo — Beta.
Remove →HEIC to JPG Converter
Convert iPhone HEIC photos to JPG or PNG.
Convert →Audio Converter
Trim and convert small audio files to WAV.
Convert →ZIP Creator
Create a ZIP from files, or extract one.
Zip →Why Use a Calculator Before You Decide?
A monthly payment is never just the headline number. A mortgage adds property tax, home insurance and sometimes PMI. A car loan adds interest that can cost thousands over five years. A credit card at 22% APR can take almost three years to clear with a fixed $200 payment — and far longer on minimum payments alone. A calculator turns a vague feeling ("can I afford this?") into a number you can compare, and a schedule you can plan around.
That is why every calculator on this site shows its working. The mortgage calculator shows principal and interest separately from tax and insurance, with a year-by-year amortisation table. The loan calculator shows total interest, not just the monthly payment. The retirement calculator shows your contributions separately from investment growth. When a number looks surprising, you can trace it back to the input that caused it.
How These Tools Work
All 79 tools run entirely in your browser with plain JavaScript. Nothing you type is uploaded, stored or shared — there is no account, no server and no database behind this site. That also means results are instant: change the interest rate or the loan term and the answer updates immediately. The file tools go one step further: a PDF you merge or an image you compress never leaves your device at all.
Each tool page also explains how it works in plain English, works through a real example with real numbers, and answers the five questions people ask most about that topic. If you are new to a topic, read the guide first; if you already know what you need, jump straight to the tool at the top of the page.
What You Will Not Find Here
We do not ask for your name, email or bank details, and we do not sell financial products. The calculators give estimates based on the numbers you enter — they do not know your credit score, your local tax rates or a lender's exact fees, so treat every result as a planning estimate, not a quote. For a binding answer, talk to your lender, employer or a licensed financial professional. Our disclaimer explains this in full.