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Free online calculators and file tools for everyday questions.
Calculate faster with 140+ free tools for maths, money, studies, career, images and PDFs, and development.
Popular tools
Browse all 146 →Image CompressorNewCompress JPG, PNG and WebP images in your browser, singly or in batches, without uploading them.JPG to PDF ConverterCombine JPG, PNG and WebP images into one multi-page PDF, with order, rotation and page size.Merge PDFCombine several PDF files into a single PDF, in the order you choose, in your browser.Passport Photo ResizerNewCrop and resize a photo to exact pixels and a KB range for online application forms.Percentage CalculatorFind X% of a number, what percent one number is of another, or the whole from a part.EMI CalculatorMonthly EMI, total interest and total payable for any reducing-balance loan.SIP CalculatorProjected value of a monthly investment at an assumed return, with an optional yearly step-up.GST CalculatorAdd GST to a price or remove it from a GST-inclusive price, with CGST, SGST and IGST split.Age CalculatorExact age in years, months and days from a date of birth, plus the next birthday.CGPA to Percentage CalculatorConvert CGPA to percentage using CBSE's × 9.5 rule, × 10, or your university's own formula.Unit ConverterOne converter for length, weight, temperature, area, volume, speed, time, data storage and fuel economy.PDF CompressorReduce PDF file size by re-compressing pictures or redrawing pages, with an optional KB target.
Browse by category
146 tools in 8 categories
MathPercentages, fractions, algebra, geometry and statistics36 tools Image & PDFCompress, resize, convert and combine images and PDFs, without uploading them11 tools EverydayDates, ages, time, pace and unit conversions17 tools StudentMarks, percentages, CGPA, GPA and attendance11 tools CareerSalary hikes, take-home pay, experience and notice periods9 tools MoneyEMI, interest, SIP, FD, RD, GST and inflation14 tools DeveloperJSON, text, CSV, hashes, URLs, JWTs, regex and more — all local31 tools ExamsMarks and score calculators for JEE, NEET, GATE, CAT, SSC, banking, UPSC and railway exams17 tools
Recently added
The newest calculators and converters.
Image CompressorNewCompress JPG, PNG and WebP images in your browser, singly or in batches, without uploading them.Remove Duplicate LinesNewDelete repeated lines from a list and keep one copy of each, in your browser.Image ResizerNewResize images to exact pixels, a percentage, or centimetres and inches at your DPI.Sort Lines AlphabeticallyNewSort a list of lines A to Z, Z to A, by number or length, or shuffle them.Image ConverterNewConvert images between JPG, PNG and WebP in your browser, one or many at a time.Find and Replace TextNewFind words or patterns in your text and replace them, with case and regex options.Passport Photo ResizerNewCrop and resize a photo to exact pixels and a KB range for online application forms.Remove Extra SpacesNewClean pasted text: collapse repeated spaces, trim lines, drop blank lines or join lines.
Image and PDF tools
Compress, resize, convert and merge files. They never leave your device.
Image CompressorNewCompress JPG, PNG and WebP images in your browser, singly or in batches, without uploading them.Image ResizerNewResize images to exact pixels, a percentage, or centimetres and inches at your DPI.Image ConverterNewConvert images between JPG, PNG and WebP in your browser, one or many at a time.Passport Photo ResizerNewCrop and resize a photo to exact pixels and a KB range for online application forms.JPG to PDF ConverterCombine JPG, PNG and WebP images into one multi-page PDF, with order, rotation and page size.Merge PDFCombine several PDF files into a single PDF, in the order you choose, in your browser.Split PDFExtract pages, split by range, save each page separately or remove pages from a PDF.PDF CompressorReduce PDF file size by re-compressing pictures or redrawing pages, with an optional KB target.
Essential calculators
Everyday maths, solved step by step.
Scientific CalculatorType a full expression with brackets, powers, trigonometry, logs and factorials, in degrees or radians.Fraction CalculatorAdd, subtract, multiply and divide fractions and mixed numbers, simplified automatically.Ratio CalculatorSimplify a ratio to lowest terms, or split an amount in a given ratio.Average CalculatorMean, median, mode, range, sum and count for a list of numbers.Square Root CalculatorFind square, cube or nth roots, with simplified radical form and a perfect-power check.HCF and LCM CalculatorHighest common factor (GCD) and lowest common multiple of two or more numbers, with prime factors.Quadratic Equation SolverSolve ax² + bx + c = 0: discriminant, real or complex roots, vertex and factored form.Standard Deviation CalculatorStandard deviation and variance of a list of numbers, sample or population, with the working.
Student and exam tools
Marks, percentiles and scores for the exams students ask about most.
JEE Main Marks CalculatorAdd up your JEE Main Paper 1 score from correct and wrong answers, out of 300.NEET UG Marks CalculatorCalculate NEET UG marks from correct and wrong answers: +4, −1, out of 720.GATE Score CalculatorConvert GATE marks to a score out of 1000 using the official formula and your paper's published figures.CAT Score CalculatorCAT raw score by section from correct and wrong MCQs and correct TITA answers.SSC CGL Tier 1 Score CalculatorRaw Tier-I score from correct and wrong answers per section, using the SSC CGL 2025 marking scheme.UPSC Prelims Score CalculatorUPSC Prelims GS Paper I and CSAT scores with ⅓ negative marking and the 33% CSAT check.CGPA to Percentage CalculatorConvert CGPA to percentage using CBSE's × 9.5 rule, × 10, or your university's own formula.Marks Percentage CalculatorPercentage from marks obtained, marks from a percentage, or an overall percentage across subjects.
Money and finance
Loans, investments and tax-style calculations with the assumptions stated.
EMI CalculatorMonthly EMI, total interest and total payable for any reducing-balance loan.SIP CalculatorProjected value of a monthly investment at an assumed return, with an optional yearly step-up.Lumpsum CalculatorSee what a one-time investment could grow to at a fixed annual return, with an inflation-adjusted value.Compound Interest CalculatorGrowth of a lump sum with interest on interest, for any compounding frequency.GST CalculatorAdd GST to a price or remove it from a GST-inclusive price, with CGST, SGST and IGST split.FD CalculatorMaturity amount and interest on a fixed deposit with quarterly, monthly, yearly or simple interest.Loan Prepayment CalculatorSee the interest and time saved by making a one-time part-payment on a loan.CTC to Take-Home Salary Calculator (India)Estimate monthly in-hand salary from annual CTC in India under the new tax regime for FY 2026-27.
Everyday conversions
Exact conversion factors for the units people actually use.
Unit ConverterOne converter for length, weight, temperature, area, volume, speed, time, data storage and fuel economy.Length ConverterConvert between kilometres, metres, centimetres, miles, yards, feet, inches and more.Weight ConverterConvert between kilograms, grams, pounds, ounces, stones, tonnes, quintals and carats.Temperature ConverterConvert between Celsius, Fahrenheit, Kelvin and Rankine, with absolute-zero checks.Data Storage ConverterConvert bits, bytes, KB, MB, GB, TB and the binary KiB, MiB, GiB and TiB units.Speed ConverterConvert between km/h, mph, m/s, knots and feet per second.Area ConverterConvert square metres, hectares, acres, square feet, square yards, square miles and more.Volume ConverterConvert litres, millilitres, cubic metres, US and imperial gallons, cups, spoons and more.
Developer utilities
Run entirely in your browser. Nothing you paste is uploaded.
JSON FormatterPretty-print JSON with 2 or 4 spaces or tabs and optional key sorting — numbers are never altered.CSV to JSON ConverterConvert CSV or spreadsheet data to JSON, with delimiter detection and type conversion.Password GeneratorGenerate strong random passwords with your browser's secure random generator, never sent anywhere.Remove Duplicate LinesNewDelete repeated lines from a list and keep one copy of each, in your browser.Base64 Encode and DecodeEncode text to Base64 or decode Base64 to text, with URL-safe output and full Unicode support.Regex TesterTest a regular expression against text with highlighted matches, capture groups and a replace preview.QR Code GeneratorMake a QR code for a link, text, contact, email, phone or SMS, as PNG or SVG.Text Diff CheckerCompare two texts line by line and see exactly what was added and removed.
- Answer first. Use any tool straight away, with no account or pop-ups.
- Working shown. Every result lists its steps, formula and assumptions.
- Private by design. Calculations run in your browser; inputs are not uploaded.
Rules that depend on a country, year or exam carry their source and review date. See the methodology, or report a mistake on the contact page.