All Free Online Tools
Tallyloom provides fast, free tools for everyday calculations, conversions, document generation, and developer utilities. Every tool below is live, free to use without an account, and runs in your browser.
Convert & Time
⇄Unit ConverterConvert length, weight, volume, area, temperature, and speed between common units.$Currency ConverterConvert between 30+ world currencies using regularly updated reference exchange rates.◷Timezone ConverterCompare a date and time across major world cities, with business-hours indicators.◈Cooking Measurement ConverterConvert cups, tablespoons, teaspoons, and milliliters — plus cups to grams by ingredient.◷Age & Date Difference CalculatorCalculate exact age or the difference between two dates in years, months, weeks, and days.◷Countdown / Days UntilLive countdown of days, hours, minutes, and seconds to any date and time.▤File Size ConverterConvert bytes, KB, MB, GB, and TB with decimal (SI) and binary (IEC) units side by side.◷Date & Business Days CalculatorAdd or subtract calendar or business days, and count working days between two dates.◷Time Duration CalculatorHours between two times — overnight-aware, break-deducting, with decimal hours for timesheets.◷Week NumberToday's ISO 8601 week number, the week of any date, and the dates of any week.◷Military Time Converter24-hour to 12-hour time and back, with a full reference chart.
Generate & Documents
▤Invoice GeneratorBuild an itemized, professional invoice with tax and totals, then print or save as PDF.▤Receipt GeneratorCreate a clean, itemized receipt with tax and payment method, ready to print.▤Resume / CV BuilderBuild a clean, recruiter-friendly resume and print or save it as a PDF.▤Cover Letter GeneratorGenerate a structured cover letter draft in your choice of tone, then edit and print.▦QR Code GeneratorCreate QR codes for links, text, Wi-Fi, email, and phone — download as PNG or SVG.◈Password GeneratorGenerate strong random passwords or memorable passphrases with a live strength estimate.✎Signature GeneratorType or draw a signature and download it as a transparent PNG for documents.
Dev & Text Utilities
{}JSON FormatterPretty-print, validate, and minify JSON with clear error messages..*Regex TesterTest JavaScript regular expressions with live match highlighting and capture groups.64Base64 Encoder / DecoderEncode text to Base64 or decode it back, with full Unicode support.¶Word CounterCount words, characters, sentences, and paragraphs, with reading-time estimates.AaCase ConverterConvert text between UPPERCASE, Title Case, camelCase, snake_case, kebab-case, and more.±Diff CheckerCompare two blocks of text line by line with additions and removals highlighted.%URL Encoder / DecoderPercent-encode text for URLs or decode %-escaped strings, with component and full-URL modes.◷Unix Timestamp ConverterEpoch to human-readable date (local, UTC, ISO 8601) and back, with a live current timestamp.◈UUID GeneratorCryptographically random v4 UUIDs, singly or in bulk, with formatting options.#Hash GeneratorSHA-256, SHA-512, SHA-384, and SHA-1 digests of any text via the browser's WebCrypto API.◈JWT DecoderDecode a JSON Web Token's header, payload, and expiry — entirely in your browser, never transmitted.◆Color ConverterHEX, RGB, and HSL conversions with a live swatch and visual picker.¶Lorem Ipsum GeneratorPlaceholder paragraphs, sentences, or words — classic opening optional.</>HTML Encoder / DecoderEscape text into HTML entities or decode named and numeric entities back to plain text.AaText CleanerJoin broken lines, collapse spaces, and strip blank or duplicate lines from pasted text.◷Cron Expression GeneratorCompose standard 5-field cron expressions with presets and a plain-English readback.
Image & Files
⇄Image ResizerResize images to exact dimensions or a percentage — entirely on your device, never uploaded.▦Image CompressorShrink image files with a live size comparison as you tune quality — no upload.⇄Image ConverterConvert between PNG, JPEG, and WebP in your browser — transparency handled honestly.◈Image CropperDrag to crop — free-form or fixed ratios — cut at full resolution on your device.◆Color Palette ExtractorThe dominant colors of any image as copy-ready HEX swatches — extracted on-device.▦Favicon GeneratorA complete favicon set — real multi-size .ico plus Apple/Android PNGs and the HTML tags.
Accessibility
◆Color Contrast CheckerExact WCAG 2.2 contrast ratio for any color pair, with AA/AAA verdicts and a suggested passing shade.▦Palette Contrast CheckerYour whole palette as a pairwise WCAG contrast matrix — every text/background combination at a glance.◉Color Blindness SimulatorSee any image or palette through protanopia, deuteranopia, tritanopia, and achromatopsia — on your device.¶Readability AnalyzerFlesch Reading Ease, grade level, and long-sentence flagging — plain language is accessibility.⇄PX to REM ConverterPixels to rem at any root size — the unit conversion behind text that scales for low-vision users.
Education & Study
▤GPA CalculatorCalculate your GPA on the 4.0 scale from course grades and credit hours, including cumulative GPA.%Final Grade CalculatorFind the score you need on the final exam to reach your target course grade.%Fraction CalculatorAdd, subtract, multiply, and divide fractions — simplified, as mixed numbers, with the work shown.❝Citation GeneratorAPA 7, MLA 9, and Chicago citations for websites, books, and journal articles — formatted instantly.⇄Roman Numeral ConverterNumbers to Roman numerals and back (1–3999) with strict validation and the rules explained.◷Study TimerA Pomodoro focus timer with custom lengths, automatic long breaks, a chime, and session tracking.◈Random Name PickerFair random picks from any list — raffle draws without repeats, or split a class into random groups.▤Flashcard CreatorCreate flashcard decks and study with a quiz mode — track missed cards, print, and export/import decks.%Percentage CalculatorPercent of a number, percent change, and "X is what percent of Y" — instantly.
Health & Fitness
◆BMI CalculatorBody mass index from height and weight, in US or metric units, with standard categories.◉Calorie / TDEE CalculatorDaily calorie needs (BMR and TDEE) via the Mifflin-St Jeor equation, with goal targets.◆Body Fat CalculatorBody fat percentage from tape measurements via the U.S. Navy circumference method, with category ranges.◉Water Intake CalculatorA daily drinking-water estimate from National Academies guidance, adjusted for exercise.%Heart-Rate Zone CalculatorFive training zones by age, personalized with the Karvonen method when you know your resting pulse.◷Running Pace CalculatorPace per mile and kilometer from distance and time, with race presets and split times.
Money & Finance
◆Compound Interest CalculatorProject growth from a starting amount plus monthly contributions, with a year-by-year breakdown.$Debt Snowball CalculatorBuild a debt payoff plan and compare snowball vs avalanche strategies, with your debt-free date.◷Retirement Savings CalculatorProject savings to retirement age with the 4% guideline and inflation-adjusted value — assumptions stated.%Mortgage CalculatorMonthly payment with taxes, insurance, and HOA — plus total interest and extra-payment savings.▤Amortization ScheduleYear-by-year principal, interest, and balance for any fixed-rate loan, with extra payments.%Loan Payoff CalculatorYour payoff date and total interest — and what an extra monthly payment saves.$Auto Loan CalculatorCar payment from price, trade-in, tax, rate, and term — with the true all-in cost.$Tip CalculatorTip, total, and per-person split for any bill, with quick presets.$Sales Tax CalculatorAdd sales tax to a price, or back the tax out of a receipt total.▦Budget PlannerMonthly income vs categorized expenses, what's left over, and a 50/30/20 comparison — saved on your device.$Hourly to Salary ConverterHourly rate to annual salary and back, with your real hours and weeks — gross pay, stated plainly.%Discount CalculatorSale price and savings from any percent off, with stacked discounts done right.
Conversion charts
Beyond the tools above, these quick-reference pages cover the most-searched unit conversions — each with the exact formula and a chart of common values.