Free Online Tools
for Everyone
173 free calculators, PDF tools, SEO utilities, and generators. Works instantly in your browser — no signup, no fees, no files uploaded to servers.
Financial Calculators
28 free tools
EMI Calculator
Calculate monthly EMI for home, car, or personal loans with a full amortization schedule.
Mortgage Calculator
Estimate monthly mortgage payments with taxes, insurance, and HOA fees included.
House Affordability Calculator
Find out how much house you can afford from your income using the 28/36 rule.
Credit Card Payoff Calculator
See how long to clear a card balance and how much interest you save by paying more.
Compound Interest Calculator
See how your money grows with daily, monthly, or annual compounding.
ROI Calculator
Calculate return on investment and annualized ROI for any investment.
Retirement Savings Calculator
Project your retirement corpus from monthly savings and expected returns.
Currency Converter
Convert between 20+ major world currencies instantly.
Mortgage Refinance Calculator
Compare your current mortgage to a refinance and find the break-even point and savings.
Rental Property ROI Calculator
Calculate cap rate, cash-on-cash return, and monthly cash flow on a rental property.
Rent vs Buy Calculator
Compare the lifetime cost of renting versus buying a home.
Debt Snowball & Avalanche Calculator
Build a payoff plan comparing the snowball and avalanche methods.
Student Loan Payoff Calculator
See your payoff time and interest saved with extra payments.
Debt-to-Income Ratio Calculator
Compute your DTI ratio to check loan eligibility.
Paycheck Calculator
Estimate take-home pay after federal, FICA, and state taxes, and convert between hourly, monthly, and annual salary.
Auto Loan Calculator
Calculate your monthly car payment with down payment, trade-in, sales tax, and APR — plus total interest.
Sales Tax / VAT / GST Calculator
Add or remove sales tax, VAT, or GST from any amount, with presets for common rates and GST slabs.
FD Calculator
Calculate fixed-deposit maturity value and interest with monthly, quarterly, or annual compounding.
PPF Calculator (India)
Project your India Public Provident Fund (PPF) maturity over 15 years from yearly contributions and the current rate.
Gratuity Calculator (India)
Estimate your India gratuity payout from last-drawn salary and years of service under the Payment of Gratuity Act, 1972.
HELOC Calculator
Find your available home-equity line of credit from your home value, loan-to-value limit, and mortgage balance.
Personal Loan Calculator
Calculate monthly payments, total interest, and APR on a personal loan, including any origination fee.
NPS Calculator (India)
Project your India National Pension System corpus, annuity, and lump sum at retirement.
EPF Calculator (India)
Estimate your India Employees’ Provident Fund balance at retirement from salary and contributions.
RD Calculator
Calculate recurring-deposit maturity value and interest from your monthly deposit and rate.
Profit Margin Calculator
Calculate profit margin, markup, and profit from your cost and revenue or selling price.
Break-Even Calculator
Find the units and revenue you must sell to break even from fixed costs, price, and variable cost.
Simple Interest Calculator
Calculate simple interest and the total amount from principal, rate, and time.
Investing, Wealth & Tax
29 free tools
CAGR Calculator
Compute the compound annual growth rate of an investment between two values.
Dividend Calculator
Estimate annual, quarterly, and monthly dividend income and yield from your investment.
Net Worth Calculator
Add up your assets and liabilities to find your total net worth.
Capital Gains Tax Calculator
Estimate the tax on profits from selling stocks, property, or other assets.
401(k) Calculator
Project your 401(k) balance at retirement with employer match and growth.
Roth IRA Calculator
Estimate tax-free Roth IRA growth from your annual contributions.
Stock Average Calculator
Average down your cost basis across multiple stock purchases.
Stock Profit Calculator
Calculate gain, loss, and percentage return on a stock trade after fees.
Inflation Calculator
See how inflation erodes the purchasing power of money over time.
FIRE Calculator
Find your financial independence number and years to retire early.
Rule of 72 Calculator
Estimate how many years it takes to double your money.
Dollar-Cost Averaging Calculator
Model returns from investing a fixed amount at regular intervals.
Expense Ratio Calculator
Reveal how much fund fees cost you in returns over decades.
Portfolio Rebalancing Calculator
Find the buy/sell amounts to bring holdings back to target allocation.
Bond Yield Calculator
Compute current yield and yield to maturity for a bond.
Options Profit/Loss Calculator
Plot profit and loss for call and put options at expiry.
Income Tax Calculator
Estimate US federal income tax, effective rate, and marginal rate.
Self-Employment Tax Calculator
Estimate US 1099 self-employment tax and quarterly payments.
Crypto Profit Calculator
Calculate profit or loss on a crypto trade from buy and sell price, quantity, and fees.
Pip Calculator
Calculate the value of a pip in any forex pair for your lot size and account currency.
Forex Margin Calculator
Work out the margin required to open a forex position from lot size, price, and leverage.
Position Size Calculator
Find the right trade size from your account balance, risk percentage, and stop-loss distance.
Risk/Reward Ratio Calculator
Calculate your risk-to-reward ratio and required win rate from entry, stop-loss, and target.
Stop Loss & Take Profit Calculator
Set stop-loss and take-profit price levels from your entry and chosen percentages or amounts.
Stock Return Calculator
Calculate total and annualized stock returns, including reinvested dividends, between two dates.
DCF Calculator
Estimate a stock’s intrinsic value with a discounted cash flow model and growth assumptions.
529 College Savings Calculator
Project a 529 college-savings plan balance from contributions, growth, and years to college.
HSA Calculator
Estimate Health Savings Account growth and tax savings from annual contributions.
Annuity Calculator
Calculate annuity payouts or future value from your principal, rate, and payout period.
Insurance Calculators
2 free tools
Mutual Funds & SIP
10 free tools
Mutual Fund Explorer
Search any Indian mutual fund and see its real returns and NAV history, with live AMFI data.
SIP Calculator
Project the maturity value of a monthly SIP from amount, return, and tenure.
Lumpsum Calculator
Estimate the growth of a one-time mutual fund investment over time.
Step-Up SIP Calculator
See how increasing your SIP each year grows your final corpus.
SWP Calculator
Calculate systematic withdrawal payouts and the remaining corpus over time.
STP Calculator
Model a systematic transfer from one mutual fund to another.
XIRR Calculator
Compute the annualized return on irregular cash flows like SIP instalments.
Goal SIP Calculator
Find the monthly SIP needed to reach a target corpus by a target date.
ELSS Calculator
Estimate ELSS returns and the 80C tax saved with the 3-year lock-in.
Mutual Fund Returns Calculator
Compute absolute and annualized returns between two NAV values.
Health & Fitness Calculators
14 free tools
TDEE Calculator
Calculate your daily calorie needs (TDEE) and BMR from age, weight, height, and activity.
Macro Calculator
Split your daily calories into protein, carbs, and fat for your goal.
BMI Calculator
Calculate your Body Mass Index from height and weight, with your healthy-weight range — metric or imperial.
Body Fat Calculator
Estimate your body fat percentage using the U.S. Navy method from a few body measurements.
Ideal Weight Calculator
Find your ideal body weight range for your height using the Devine, Robinson, and BMI methods.
Pregnancy Due Date Calculator
Estimate your due date and current week of pregnancy from your last period or conception date.
Pace Calculator
Calculate running pace, time, or distance — and see race-time predictions for 5K to marathon.
Ovulation Calculator
Estimate your fertile window, ovulation day, and next periods from your cycle length.
Calories Burned Calculator
Estimate calories burned for 20+ activities from your weight and workout duration using MET values.
Water Intake Calculator
Find how much water to drink each day based on your weight, activity, and climate.
Sleep Calculator
Find the best bedtime or wake-up time based on 90-minute sleep cycles.
BMR Calculator
Calculate your Basal Metabolic Rate — the calories your body burns at rest.
Heart Rate Zone Calculator
Find your target heart-rate training zones from your age and resting heart rate.
One Rep Max Calculator
Estimate your 1-rep max (1RM) for any lift from the weight and reps you performed.
Text & SEO Tools
5 free tools
Slug Generator
Turn any title into a clean, SEO-friendly URL slug instantly.
Keyword Density Analyzer
Analyze word and phrase frequency and density in any text for SEO.
Case Converter
Convert text to UPPERCASE, lowercase, Title Case, Sentence case, camelCase, snake_case, and kebab-case.
Online Notepad
A free online notepad that auto-saves to your browser — write notes with no signup.
Citation Generator
Generate APA, MLA, and Chicago citations for websites, books, and journals.
PDF & Document Tools
14 free tools
PDF Merge
Combine multiple PDF files into one, reordering pages before merging.
PDF Split
Extract specific pages from a PDF or split it into individual files.
PDF Compress
Reduce PDF file size by removing metadata and overhead.
JPG to PDF Converter
Convert JPG and PNG images into a single PDF, in order, in your browser.
Word Counter
Count words, characters, sentences, paragraphs, and reading time.
Rotate PDF
Rotate all pages of a PDF by 90, 180, or 270 degrees, in your browser.
Watermark PDF
Stamp a custom text watermark across every page of a PDF — set the words, opacity, size, angle, and color.
Add Page Numbers to PDF
Insert page numbers into a PDF with a custom position, format, and starting number.
Organize PDF
Reorder, rotate, or delete pages in a PDF and download the rearranged document.
PDF to JPG
Convert every page of a PDF into a high-resolution JPG image and download them as a ZIP.
PDF to Text Extractor
Pull all selectable text out of a PDF into clean, copyable plain text.
Unlock PDF
Remove the password from a PDF you can open — enter the password and download an unprotected copy.
Protect PDF
Add a password and encrypt a PDF so only people with the password can open it.
Sign PDF
Draw or type a signature and place it anywhere on a PDF, then download the signed file.
Image Tools
12 free tools
Bulk Image Converter
Convert, resize, and compress many JPG, PNG, or WebP images at once, then download as a ZIP.
Image Resizer
Resize a JPG, PNG, or WebP image by pixels or percentage, with social-media presets.
Image to Text (OCR)
Extract text from images and scanned PDFs with in-browser OCR — no upload, supports 100+ languages.
Image Compressor
Compress JPG, PNG, and WebP images to a target file size or quality, right in your browser.
Crop Image
Crop a photo to any aspect ratio or freeform selection, with live preview, in your browser.
Rotate & Flip Image
Rotate an image by 90°, 180°, or 270° and flip it horizontally or vertically, then download.
Circle Crop (Profile Picture)
Crop an image into a circle for a profile picture and download it as a transparent PNG.
PNG to JPG Converter
Convert PNG images to JPG with a chosen background and quality, right in your browser.
JPG to PNG Converter
Convert JPG images to lossless PNG instantly, in your browser, with no uploads.
HEIC to JPG Converter
Convert iPhone HEIC/HEIF photos to widely supported JPG images, right in your browser.
WebP to JPG Converter
Convert WebP images to JPG with adjustable quality, entirely in your browser.
SVG to PNG Converter
Rasterize SVG vector graphics to PNG at any size, with transparency, in your browser.
Unit & Format Converters
4 free tools
Unit Converter
Convert length, weight, temperature, area, volume, speed, time, and digital storage units.
Roman Numeral Converter
Convert numbers to Roman numerals and Roman numerals back to numbers, both ways.
Time Zone Converter
Convert a time between any two time zones and compare cities around the world.
Number to Words Converter
Convert numbers to words in English — for cheques, invoices, and documents.
Everyday Calculators
16 free tools
Age Calculator
Find your exact age in years, months, and days from your date of birth, plus your next birthday countdown.
Percentage Calculator
Work out percentages every way — X% of Y, what percent X is of Y, and percentage increase or decrease.
GPA Calculator
Calculate your grade point average from course grades and credit hours on a 4.0 scale.
Tip Calculator
Work out the tip and split the bill between any number of people, with custom tip percentages.
Discount Calculator
Find the sale price and how much you save from an original price and a percentage or fixed discount.
Time Card Calculator
Add up daily clock-in and clock-out times with breaks to get weekly hours, overtime, and gross pay.
Scientific Calculator
A full scientific calculator with trig, logarithms, powers, roots, parentheses, and memory.
Date Duration Calculator
Count the days, weeks, and months between two dates, or add and subtract days from a date.
Fuel Cost Calculator
Work out the fuel cost of a trip from distance, fuel efficiency, and the price per litre or gallon.
Aspect Ratio Calculator
Solve for a missing width or height while keeping an aspect ratio like 16:9, 4:3, or a custom one.
Grade Calculator
Calculate your weighted course grade from assignment scores and their weights.
Final Grade Calculator
Find the score you need on the final exam to reach your target course grade.
Timer & Stopwatch
A free online countdown timer with alarm and a stopwatch with lap times — runs in your browser.
Online Calculator
A simple, fast online calculator for everyday math with keyboard support and memory keys.
Time Calculator
Add or subtract hours, minutes, and seconds — and convert between time units.
Average Calculator
Calculate the mean, median, mode, range, and sum of a list of numbers.
Generators
12 free tools
WiFi QR Code Generator
Create a QR code that connects guests to your WiFi when scanned.
Password Generator
Generate strong, random passwords with custom length and character sets — created in your browser.
QR Code Generator
Turn any link or text into a QR code and download it as a PNG or SVG.
Lorem Ipsum Generator
Generate placeholder paragraphs, sentences, or words for designs and mockups.
Invoice Generator
Create a professional invoice with line items and tax, then download it as a PDF — free, no signup.
Random Number Generator
Generate random numbers in any range, with options for count, uniqueness, and sorting.
Barcode Generator
Create CODE128, EAN, and UPC barcodes from any text or number and download as PNG or SVG.
Dice Roller
Roll virtual dice (d4–d20 or custom) with truly random results, totals, and roll history.
Coin Flip
Flip a virtual coin once or many times and see heads/tails results with a running tally.
Text to Speech
Convert text to spoken audio with adjustable voice, speed, and pitch, using your browser.
Random Picker
Pick a random winner from a list of names or items — like a wheel spinner.
Signature Generator
Draw or type your signature and download it as a transparent PNG, in your browser.
Developer Tools
27 free tools
JSON Formatter & Validator
Format, beautify, minify, and validate JSON with clear error messages.
Base64 Encode / Decode
Encode text to Base64 or decode Base64 back to text, with full Unicode support.
URL Encode / Decode
Percent-encode or decode text for safe use in URLs and query strings.
Hash Generator
Generate MD5, SHA-1, SHA-256, and SHA-512 hashes from any text.
JWT Decoder
Decode a JSON Web Token to read its header and payload claims.
UUID Generator
Generate one or many random version-4 UUIDs instantly.
Unix Timestamp Converter
Convert between Unix timestamps and human-readable dates, both ways.
Regex Tester
Test regular expressions live with match highlighting and capture groups.
Color Converter
Convert colors between HEX, RGB, and HSL with a live swatch preview.
Text Diff Checker
Compare two blocks of text and highlight every added, removed, and unchanged line.
Number Base Converter
Convert numbers between binary, octal, decimal, and hexadecimal instantly.
JSON ↔ CSV Converter
Convert a JSON array of objects to CSV and back, right in your browser.
HTML Entity Encoder / Decoder
Encode special characters to HTML entities or decode entities back to text.
Markdown Previewer
Write Markdown and see a live HTML preview, then copy the generated HTML.
JSON ↔ YAML Converter
Convert JSON to YAML and YAML to JSON instantly, with validation, in your browser.
CSS Gradient Generator
Build linear and radial CSS gradients visually with live preview and copyable CSS code.
Color Palette Generator
Generate harmonious color palettes and shade scales from a base color, with hex codes to copy.
Favicon Generator
Turn any image into favicon sizes (16–512px) and download them all as a ZIP, in your browser.
Cron Expression Parser
Translate a cron expression into plain English and see the next scheduled run times.
Code Beautifier & Minifier
Beautify or minify HTML, CSS, and JavaScript instantly, right in your browser.
SQL Formatter
Format and beautify SQL queries with indentation and keyword casing, for many SQL dialects.
JSON ↔ XML Converter
Convert JSON to XML and XML to JSON, with formatting, in your browser.
Image to Base64 Converter
Encode an image to a Base64 data URI (and back), with ready-to-paste HTML and CSS snippets.
JSON to TypeScript
Generate TypeScript interfaces from any JSON object, with nested types inferred automatically.
IP Subnet Calculator
Compute network, broadcast, host range, and mask from an IPv4 address and CIDR or subnet mask.
Meta Tag Generator
Generate SEO and Open Graph meta tags for your web page from a simple form.
HMAC Generator
Generate an HMAC signature from a message and secret key using SHA-256, SHA-384, or SHA-512.
Why TopOpenTools?
Privacy First
PDF and image files are processed locally in your browser. Nothing is uploaded to our servers.
Instant Results
All tools run directly in your browser — no server round-trips, no waiting.
Always Free
No hidden fees, no premium tiers for basic features. Free for everyone, forever.