All Tools

The full list of 100+ free online tools on SmallUseTools, searchable and grouped by category.

• Scientific Calculator — Free online scientific calculator with trig, logs, roots, powers, factorials, memory keys, DEG/RAD and a calculation history.
• Basic Calculator — A clean four-function online calculator with percent, sign change, backspace, keyboard input and a history of your sums.
• Percentage Calculator — Work out X% of Y, what percent one number is of another, percentage change, or increase and decrease a value by a percent.
• Fraction Calculator — Add, subtract, multiply and divide fractions and mixed numbers, with the simplified answer, decimal value and worked steps.
• Discount Calculator — Find the sale price and how much you save, with an optional second stacked discount and sales tax added on top.
• Tip Calculator — Work out the tip and total for a bill, split it between any number of people, and optionally round each share up.
• Ratio Calculator — Simplify ratios like 12:18, solve proportions such as 2:3 = 8:?, and split a total amount in a given ratio.
• Loan EMI Calculator — Calculate the monthly EMI for any loan, plus total interest, total payment and a year-by-year repayment breakdown.
• Mortgage Calculator — Estimate your monthly mortgage payment including principal and interest, property tax, home insurance and HOA fees.
• Financial Calculator (TVM) — Time value of money solver: find N, I/Y, PV, PMT or FV from the other four, with payments per year and begin/end mode.
• Compound Interest Calculator — See how savings grow with compound interest, any compounding frequency and optional monthly contributions, year by year.
• Simple Interest Calculator — Calculate simple interest with I = P × r × t, or solve for the principal, rate or time, using years, months or days.
• Salary Calculator — Convert pay between hourly, daily, weekly, bi-weekly, monthly and annual amounts, with optional deductions for take-home pay.
• Income Tax Calculator — Estimate progressive income tax with your own editable brackets, allowance and deductions, and see effective and marginal rates.
• Investment Calculator — Project the future value of an investment with regular contributions, an expected annual return and a year-by-year table.
• Retirement Calculator — Project your retirement savings, the amount you need for an inflation-linked income, the gap and the extra monthly saving required.
• Savings Goal Calculator — Find out how long it takes to reach a savings goal, or how much you need to save each month to reach it by a date.
• Loan Amortization Calculator — Build a full monthly amortization schedule and see how an extra monthly payment cuts total interest and payoff time.
• Present Value Calculator — Find the present value of a future lump sum or of a series of payments (ordinary annuity or annuity due) at a discount rate.
• Future Value Calculator — Calculate the future value of a lump sum or regular payments (ordinary annuity or annuity due) with any compounding frequency.
• Personal Budget Planner — Plan a monthly budget with income and expense lines by category, savings rate, a 50/30/20 check and CSV export, saved in your browser.
• GST / VAT Calculator — Add or remove GST or VAT at any rate and see the net, tax and gross amounts, with an optional CGST and SGST split.
• Income Statement Generator — Build a profit and loss statement from revenue, cost of sales and expense lines, with margins, tax, PDF and CSV export.
• Balance Sheet Generator — Create a balance sheet from assets, liabilities and equity, check that it balances and see current, quick and debt-to-equity ratios.
• Trial Balance Generator — List ledger accounts with debit or credit balances, check that debits equal credits, sort by code or name, and export PDF or CSV.
• Journal Entry Generator — Record multi-line double-entry journal entries, check each one balances, see a ledger summary by account and export CSV or PDF.
• Payroll Calculator — Calculate gross pay, overtime, deductions, tax and net pay for several employees at once, with totals and CSV export.
• Profit and Loss Calculator — Enter cost price, selling price, quantity and extra costs to get profit or loss, profit percentage, markup and margin explained.
• Cash Flow Calculator — Plan operating, investing and financing cash flows by month to see net cash flow and closing balance for each period, with CSV.
• Invoice Generator — Create a professional invoice with your details, line items, discounts, tax and shipping, then download it as a PDF or print it.
• Receipt Generator — Make a payment receipt with receipt number, payer, payment method, items, tax, amount paid and balance, then download a PDF.
• Inventory Management Tool — Track stock items, record stock in and out, get low-stock alerts and see stock value. Import and export CSV; data stays in your browser.
• Profit Margin Calculator — Calculate gross margin, markup and profit from cost and price, or find the selling price or cost needed for a target margin.
• Break-Even Calculator — Find the break-even point in units and revenue from fixed costs, variable cost and price, plus margin of safety and a profit table.
• ROI Calculator — Calculate return on investment from the amount invested and returned, with annualised ROI (CAGR) when you add a time period.
• UTM Link Builder — Build campaign tracking links with utm_source, medium, campaign, term and content, correctly encoded and keeping existing parameters.
• Ad Campaign Calculator — Enter any of spend, impressions, clicks, conversions and revenue to get CPM, CPC, CTR, CPA, conversion rate and ROAS instantly.
• AI Text Summarizer — Summarise long articles, reports and emails with an AI model, or offline in your browser with an extractive summariser.
• AI Content Detector — Get an AI model's estimate of whether text may be machine-written, plus local writing statistics such as burstiness and vocabulary richness.
• AI Text to Speech — Read text aloud with the voices built into your browser, with language and voice choice, speed, pitch, volume and sentence highlighting.
• Word Counter — Count words, characters, sentences and paragraphs live, with reading time and top keywords.
• Character Counter — Count characters with and without spaces, letters, digits and UTF-8 bytes, with live limit bars for X, SMS, titles and meta descriptions.
• Sentence Counter — Count sentences and see average sentence length, the longest and shortest sentence, and a numbered list of every sentence.
• Paragraph Counter — Count paragraphs and see the average words and sentences per paragraph, with a breakdown table for each paragraph.
• Case Converter — Convert text to UPPER, lower, Title Case, Sentence case, camelCase, snake_case, kebab-case, CONSTANT_CASE and more.
• Remove Duplicate Lines — Delete repeated lines from a list, with options to ignore case, trim spaces, drop empty lines and keep the first or last copy.
• Text Sorter — Sort lines alphabetically, naturally by number, by length or in reverse, or shuffle them randomly, with dedupe and case options.
• Text Reverser — Reverse text by characters, words or lines, or flip each word in place — emoji and accented letters stay intact.
• Lorem Ipsum Generator — Generate classic Lorem ipsum placeholder text by paragraphs, sentences or words, as plain text or HTML paragraphs.
• Text Diff Checker — Compare two texts side by side or in a unified view and highlight added and removed lines, words or characters.
• Slug Generator — Turn titles into clean, SEO-friendly URL slugs with accent conversion, stop-word removal, length limits and batch mode.
• Reading Time Calculator — Estimate how long an article takes to read or say aloud at slow, average, fast or custom speeds, and copy an "X min read" label.
• Meta Tag Generator — Create title, description, robots, canonical, Open Graph and X card meta tags with length meters and live search and social previews.
• Robots.txt Generator — Build a valid robots.txt with per-crawler allow and disallow rules, crawl-delay and sitemap links, then test URLs and download it.
• Keyword Density Checker — Find the most frequent one-, two- and three-word phrases in your content, with density percentages and target-keyword highlighting.
• JSON Formatter — Beautify or minify JSON with 2-space, 4-space or tab indents, sort keys and browse it as a collapsible tree.
• JSON Validator — Check JSON syntax as you type, see the exact line and column of any error and get warnings for duplicate keys.
• XML Formatter — Pretty-print or minify XML with comments, CDATA and DOCTYPE support, plus a well-formedness check with error positions.
• HTML Formatter — Beautify HTML with your choice of indentation and line wrapping, including inline <script> and <style> blocks.
• CSS Formatter — Beautify minified CSS into readable rules with custom indentation, brace style and one selector per line.
• JavaScript Formatter — Beautify JavaScript with configurable indentation, brace style and line wrapping to make minified code readable.
• Code Minifier — Minify JavaScript with Terser, plus CSS and HTML, and see the original size, minified size and percentage saved.
• Base64 Encoder — Encode text or files up to 10 MB to Base64, Base64URL or a data URL, with full UTF-8 support for any language.
• Base64 Decoder — Decode Base64, Base64URL or data URLs to text, detect invalid characters and download decoded binary files.
• JWT Decoder — Decode a JSON Web Token header and payload, see iat, nbf and exp as dates, and optionally verify HS256 signatures.
• UUID Generator — Generate up to 1,000 random v4 or time-ordered v7 UUIDs at once, and validate any UUID to see its version.
• Regex Tester — Test JavaScript regular expressions with live match highlighting, capture groups, named groups and a replace preview.
• Markdown Previewer — Write GitHub-flavoured Markdown with a live, sanitised preview, then copy the HTML or download .md and .html files.
• URL Encoder — Percent-encode text or URLs in component, full-URL or form mode, and break any URL into its parts and query parameters.
• URL Decoder — Decode percent-encoded URLs and query strings, handle + as space, unwrap double encoding and spot malformed sequences.
• HTML Entity Encoder — Escape &, <, >, quotes or every non-ASCII character as named, decimal or hex HTML entities for safe display in HTML.
• HTML Entity Decoder — Convert HTML entities like &amp;, &eacute;, &#8364; and &#x1F600; back into plain text, supporting all HTML5 named entities.
• QR Code Generator — Create QR codes for links, text, Wi-Fi, email, phone, SMS or contact cards, with custom colours, and download PNG or SVG.
• CSS Gradient Generator — Design linear, radial and conic CSS gradients with draggable colour stops and a live preview, then copy the CSS.
• Unit Converter — Convert length, weight, temperature, area, volume, speed, time, data, pressure and energy units on one page.
• Length Converter — Convert between millimetres, centimetres, metres, kilometres, inches, feet, yards, miles and nautical miles.
• Weight Converter — Convert kilograms, grams, pounds, ounces, stones, tonnes, carats and grains with exact international factors.
• Temperature Converter — Convert temperatures between Celsius, Fahrenheit, Kelvin and Rankine using the correct offset formulas.
• Volume Converter — Convert litres, millilitres, cubic metres, US and UK gallons, pints, cups, fluid ounces and spoons accurately.
• Speed Converter — Convert speed between km/h, mph, m/s, knots, feet per second and Mach, with the sea-level Mach reference shown.
• Data Storage Converter — Convert bits, bytes, KB, MB, GB, TB and PB, plus binary KiB, MiB, GiB and TiB, with 1000 vs 1024 clearly labelled.
• Currency Converter — Convert money between world currencies using daily reference exchange rates, or enter your own rate when offline.
• Pixel Converter — Convert px to pt, em, rem, %, inches, cm and mm at any DPI, with adjustable root and parent font sizes.
• Number to Words Converter — Write numbers in words in English (million or lakh/crore) or Bangla, with Taka, Dollar and other currency wording.
• Roman Numeral Converter — Convert numbers 1–3999 to Roman numerals and back, with strict validation that rejects forms like IIII or VX.
• Binary Converter — Convert binary numbers to decimal, hex and octal exactly, with nibble and byte grouping and two's complement.
• Decimal Converter — Convert decimal integers to binary, octal and hexadecimal exactly, including negative and very large numbers.
• Hex Converter — Convert hexadecimal to decimal, binary and octal exactly, with 0x prefixes, upper or lower case and bit grouping.
• Octal Converter — Convert octal numbers to decimal, binary and hexadecimal exactly — handy for Unix file permissions like 755.
• Bangla Unicode to Bijoy Converter — Convert Unicode Bangla (Avro, web text) to Bijoy ANSI for SutonnyMJ fonts, with correct kar and reph ordering.
• Bijoy to Unicode Converter — Convert Bijoy (SutonnyMJ) ANSI Bangla text to Unicode for websites, email and social media, fixing kar order.
• Image Compressor — Shrink JPEG, PNG and WebP images in your browser with a quality slider, optional max size and a before/after size comparison.
• Image Resizer — Resize images by exact pixels or percentage, with aspect lock, social media presets and contain, cover or stretch fitting.
• Image Cropper — Crop images with a touch-friendly crop box, aspect presets, keyboard nudging, rotate, flip and exact pixel coordinates.
• Image Converter — Convert images between PNG, JPEG and WebP in your browser, read GIF and BMP files, and set quality and background colour.
• JPG to PNG Converter — Convert JPG and JPEG photos to lossless PNG files in your browser, one at a time or in batches, with previews and sizes.
• PNG to JPG Converter — Convert PNG images to smaller JPG files with adjustable quality and a background colour for transparent areas.
• WebP Converter — Convert JPG, PNG, GIF and BMP to WebP, or convert WebP back to PNG or JPG, with quality control and transparency options.
• PDF Merger — Combine multiple PDF files into one in your browser, reorder them by drag and drop, and pick page ranges from each file.
• PDF Splitter — Split a PDF into single pages, custom ranges or equal chunks, or extract selected pages, with page thumbnails to guide you.
• PDF Compressor — Reduce PDF file size with lossless optimisation or strong image-based compression at your chosen DPI and quality.
• PDF to Image Converter — Convert PDF pages to PNG or JPEG images at 72 to 300 DPI, choose a page range, preview each page and download them.
• Image to PDF Converter — Combine JPG, PNG, WebP and other images into one PDF with A4, Letter or fit-to-image pages, orientation and margins.
• Image Metadata Viewer — View EXIF, GPS, XMP and IPTC metadata in photos: camera, lens, exposure, date and location, then export or remove it.
• CSV to JSON Converter — Convert CSV to JSON with full RFC 4180 support, delimiter auto-detection, header rows and optional number and boolean detection.
• JSON to CSV Converter — Convert a JSON array to CSV, flattening nested objects into dot-notation columns, with delimiter choice and an Excel-friendly BOM.
• GPA Calculator — Work out semester GPA and cumulative CGPA from credits and grades on the US 4.0, Bangladesh UGC or your own custom grading scale.
• Interactive Periodic Table — Explore all 118 elements in an interactive periodic table with atomic mass, electron configuration, electronegativity and oxidation states.
• Scientific Notation Calculator — Convert numbers to scientific, engineering and E-notation with chosen significant figures, and do arithmetic using sig-fig rules.
• Chemical Equation Balancer — Balance chemical equations exactly, including brackets, hydrates and ionic charges, with an atom-by-atom check of the result.
• Periodic Table Reaction Predictor — Pick elements or compounds and get a rule-based prediction of common school-level reactions, balanced automatically with an explanation.
• Molarity Calculator — Solve for molarity, moles, mass or volume of a solution from a formula or molar mass, plus a C1V1 = C2V2 dilution solver.
• Molecular Weight Calculator — Calculate the molar mass of any chemical formula with a per-element breakdown of atom counts, mass contribution and mass percent.
• Equation Solver — Solve linear, quadratic and cubic equations and 2×2 or 3×3 linear systems, with real and complex roots and step-by-step working.
• Matrix Calculator — Add, multiply, invert and find the determinant, rank, RREF and powers of matrices up to 6×6 with exact fraction results.
• Statistics Calculator — Paste a data set to get mean, median, mode, quartiles, variance, standard deviation, skewness, outliers and a histogram instantly.
• Standard Deviation Calculator — Find sample or population standard deviation and variance with a step-by-step table of deviations and squared deviations.
• Probability Calculator — Calculate single and two-event probabilities, conditional probability, permutations, combinations and binomial probabilities.
• BMI Calculator — Calculate your body mass index in metric or imperial units, see your WHO weight category and the healthy weight range for your height.
• BMR & Calorie Calculator — Estimate your BMR with the Mifflin-St Jeor equation, your maintenance calories by activity level, and daily targets to lose or gain weight.
• Ideal Weight Calculator — Estimate ideal body weight from your height and sex with the Devine, Robinson, Miller and Hamwi formulas, in kilograms and pounds.
• Area Converter — Convert between square metres, square feet, acres, hectares and Bangladesh land units such as decimal (shatak), katha and bigha.
• Feet to Pixel Converter — Convert real-world feet and inches to pixels, or pixels back to feet, using a drawing scale such as 1:100 or 1 inch = 8 feet and a DPI.
• Concrete Calculator — Estimate concrete volume for slabs, footings, round columns and walls, plus cement bags, sand and aggregate for a chosen nominal mix.
• Brick Calculator — Work out bricks and mortar for a wall from its length, height and thickness, brick size, joint, openings and wastage, with cement and sand.
• To-Do List — A private to-do list with due dates, priorities, tags, filters and sorting, saved in your browser with JSON export and import.
• Pomodoro Timer — A Pomodoro focus timer with custom focus and break lengths, auto-start, a chime, optional notifications and today’s session history.
• Online Stopwatch — A precise online stopwatch with lap and split times, fastest and slowest lap highlighting, keyboard shortcuts and CSV export.
• Countdown Timer — Count down to any date and time or run a duration timer, with a chime, notifications, saved countdowns and shareable links.
• Meeting Time Planner — Compare 2–8 time zones hour by hour, see everyone’s working hours, find overlapping meeting slots and copy the time for each zone.
• Age Calculator — Calculate your exact age in years, months and days, plus total weeks, days and your next birthday.
• Date Calculator — Find the days, weeks, months and business days between two dates, or add and subtract time from any date.
• Time Calculator — Add or subtract hours, minutes and seconds, find the time between two clock times overnight, and total durations.
• Time Zone Converter — Convert a date and time between any IANA time zones with daylight saving handled, offsets shown and multiple targets.
• World Clock — Live clocks for the cities you choose, saved in your browser, with day/night icons, UTC offsets and your local time highlighted.
• Calendar Generator — Create a printable monthly or yearly calendar for any year, with your week start, weekends and highlighted dates.
• Timestamp Converter — Convert Unix timestamps in seconds or milliseconds to local, UTC and ISO 8601 dates, and convert dates back to Unix time.
• Password Generator — Create strong random passwords from 4 to 128 characters with your choice of character types, plus entropy and strength.
• Hash Generator — Compute MD5, SHA-1, SHA-256, SHA-384 and SHA-512 hashes of text or files up to 200 MB, and compare them with a checksum.
• Color Picker — Pick a colour with a colour wheel, HSL sliders or a screen eyedropper and get HEX, RGB, HSL, HSV, CMYK and WCAG contrast.
• Color Converter — Convert any colour between HEX, RGB, RGBA, HSL, HSV, CMYK and all 148 CSS colour names, including alpha transparency.
• Color Palette Generator — Generate complementary, analogous, triadic and monochrome palettes or random ones, lock colours and export CSS, Tailwind or PNG.
• Random Number Generator — Generate random integers or decimals in any range, one or thousands at a time, with unique and sorted options.
• Bulk Password, Passphrase & PIN Generator — Generate up to 100 random passwords, memorable word passphrases or PINs at once and download them as a .txt file.
• Coin Flip & Dice Roller — Flip a fair coin with streak stats or roll d4, d6, d8, d10, d12, d20 and d100 dice with totals and roll history.
• Random Name Picker — Paste a list of names to draw one or more winners without repeats, or shuffle everyone into evenly sized random groups.