PlainwrenPlainwren
Free calculators and converters that run in your browser. No sign-up and no uploads: the maths happens in your browser, and your numbers, text and files are not uploaded.
Money
- Loan / EMI calculatorMonthly instalment, total interest and a full repayment schedule.
- Compound interest calculatorGrowth of savings with monthly contributions, year by year.
- VAT calculatorAdd or remove VAT: UAE, Saudi Arabia, Bahrain, Oman, UK or any rate.
- Salary to hourly calculatorConvert between hourly, daily, weekly, monthly and yearly pay.
- UAE gratuity calculatorEstimate end-of-service gratuity under Article 51 of the UAE Labour Law, with every step shown.
- Tip calculator & bill splitterWork out the tip and split a bill evenly or by what each person ordered.
- Rent split calculatorSplit rent fairly by room size, income or equally, with bills and couples, to the cent.
- Time card calculatorWeekly hours from in and out times, with lunch, night shifts, rounding, overtime and pay.
- Invoice generatorMake a clean invoice with line items and tax, then print it or save it as PDF.
Health
Numbers & dates
- Grade calculatorWeighted or points grade, drop the lowest score, and what you need on the final.
- GPA calculatorWeighted and unweighted GPA from credits and grades, cumulative GPA, and the GPA you need.
- Percentage calculatorX% of Y, percentage change, increase/decrease and reverse percentages.
- Fraction calculatorAdd, subtract, multiply and divide fractions and mixed numbers, with every step. Simplify and decimal to fraction.
- Date difference calculatorYears, months and days between dates, exact age, and adding days.
- Age calculator (Gregorian & Hijri)Exact age in years, months and days from a Gregorian or Hijri date of birth, and the next birthday.
- Time zone converterConvert a time between any two time zones, daylight saving included.
- Time zone meeting plannerFind a meeting time across up to 6 cities: working-hour overlap, copyable times and a calendar file.
- Discord timestamp generatorTime codes for Discord messages that show each reader their local time; Unix time converter.
- Unit converterLength, weight, temperature, area, volume and speed.
- Roman numeral converterNumbers and dates to Roman numerals and back, with each step and a rule checker.
- Wheel spinner & random name pickerSpin a wheel to pick a name or option at random. Lists are saved on your device.
- Random number generatorFair random numbers in any range, no repeats, decimals, a draw-one-at-a-time list and dice.
- Square footage calculatorArea of rooms in feet and inches or metres, with cut-outs, waste, boxes to buy and cost.
- Online timer & stopwatchCountdown timer with an alarm, a stopwatch with laps, and a Pomodoro timer.
- Days until (countdown)Days left until Christmas, New Year, UAE National Day, Ramadan, Eid or any date, with a share link.
- Standard deviation calculatorSample and population standard deviation with every step, plus mean, median, quartiles.
Images & files
- Compress image to KBShrink a photo to 20, 50, 100 or 200 KB (or any size) in your browser.
- Image converterConvert WebP, PNG and JPG to each other in your browser, one image or many at once.
- Image resizerResize images by pixels, percent, or cm and inches at a DPI, one or many at once. No upload.
- PDF to JPGTurn PDF pages into JPG or PNG images at 72 to 600 DPI. Pick pages, download a ZIP. No upload.
- Merge & split PDFCombine PDFs in any order, extract pages like 1-3,5,8-, or split into single pages. No upload.
- JPG to PDFTurn JPG, PNG or WebP images into one PDF. Reorder, rotate, A4 or Letter, margins. No upload.
- Signature generatorType or draw a signature picture and download a transparent PNG or SVG.
- Color picker from imageClick an image to get HEX, RGB, HSL and CMYK, the main palette and a contrast check.
- Image to text (OCR)Copy text from a screenshot, scan or photo. English, Arabic, French and more, in your browser.
- QR code generator with logoFree static QR codes for links, Wi-Fi, email or phone. Add a logo, download PNG or SVG. Never expire.
- Barcode generatorCode 128, EAN-13 and UPC-A barcodes with check digits, as SVG or PNG, one or in bulk.
Text & code
- Word & character counterWords, characters, sentences, paragraphs and reading time.
- Case converterUPPER, lower, Title, Sentence, camelCase, snake_case, kebab-case and more.
- JSON formatter & validatorPretty-print, minify and validate JSON with the exact error position.
- CSV to JSON converterCSV to JSON and back, with quoted fields, line breaks in cells and delimiter detection.
- Text compare (diff)See what changed between two texts or files, line by line and word by word.
- Cron expression generatorBuild or explain a cron schedule in plain English and see the next runs in any time zone.
- Password generatorStrong random passwords made on your device, with a strength estimate.
- Typing speed testCheck your words per minute and accuracy with 1, 2 or 5 minute tests on original passages.