Free online calculators & text tools
12 simple tools for everyday jobs. They run entirely in your browser, so what you type stays on your device. No account, no download, no clutter.
Calculators
- Percentage CalculatorPercent of a number, percent change, increase and decrease, reverse percent.
- Age CalculatorExact age in years, months and days, plus days until your next birthday.
- Days Between Dates CalculatorDays, weeks and weekdays between two dates, or add/subtract days from a date.
- GPA CalculatorSemester and cumulative GPA on the 4.0 scale, with honors/AP weighting.
- Tip CalculatorWork out the tip and split the bill between any number of people.
- Loan Payment CalculatorMonthly payment, total interest and yearly breakdown, with extra-payment savings.
Text tools
- Word CounterCount words, characters, sentences and paragraphs, plus reading time.
- Case ConverterUPPERCASE, lowercase, Title Case, Sentence case, camelCase, snake_case and more.
- Reading Time CalculatorEstimate how long an article or script takes to read, with image time and custom speed.
- Remove Duplicate LinesDelete repeated lines from a list, with trim, case and sort options.
Generators
- Password GeneratorCreate strong random passwords with the browser’s secure random generator.
- URL Slug GeneratorTurn a title into a clean, SEO-friendly URL slug.
Why browser-based tools?
Each tool is a small page of plain HTML, CSS and JavaScript with no heavy libraries, so pages load quickly even on a slow phone connection. Because the calculations are done on your device, your text, dates and numbers are not uploaded to a server. Every page includes a short guide explaining how the tool works, the formulas behind it, common mistakes and its limits, so you can check the result rather than just trust it.
New tools are added over time. If a result looks wrong or you have an idea, see the contact page. You can read how the site handles advertising and cookies in the privacy policy.