Free online tools that just work
Free online tools that just work. Fast, private, no signup. 175 tools, all offline-capable and free forever.
Most used tools
- Age CalculatorAge Calculator — free online tool. Counted the way a calendar counts: the leap days and month lengths are handled, so the years/months/days answer is what you would write on a form. Works on mobile and offline.
- Percentage CalculatorPercentage Calculator — free online tool. This is the everyday percentage case: GST on a price, a tip, a discount, a salary hike. Works on mobile and offline.
- EMI CalculatorEMI Calculator — free online tool. The EMI is fixed for the whole tenure. Works on mobile and offline.
- GST CalculatorGST Calculator — free online tool. Use Add GST when you know the pre-tax price, and Remove GST when the bill already includes tax — the two directions give different answers, which is the most common GST arithmetic mistake. Works on mobile and offline.
- SIP CalculatorSIP Calculator — free online tool. The result depends entirely on how long you stay invested, not on timing the market. Works on mobile and offline.
- BMI CalculatorCalculate your BMI using your weight and height. Understand your weight category: underweight, normal, overweight, or obese.
- Word CounterThis word counter tool provides counts for words, characters, sentences, lines, and paragraphs. Paste your text to get instant statistics.
- Case ConverterThis online case converter tool transforms your text to uppercase, lowercase, title case, or sentence case. Paste your text and convert.
- JSON FormatterThis JSON Formatter tool helps you pretty-print JSON data. It indents and structures your JSON for better readability and debugging.
- Password GeneratorGenerate strong, random passwords. Customize password length and select character types: letters, alphanumeric, or all symbols. Free online tool.
- QR Code GeneratorCreate QR codes for free. Enter text or a URL, set the size in pixels, and download your custom QR code instantly.
- Unit ConverterThis Unit Converter tool converts values across various units. Select your category, input a value, and choose your from and to units.
Browse by category
- Calculators82 tools — Finance & Math
- Converters20 tools — Unit & Data
- Formatters10 tools — Text & Code
- Generators34 tools — Security & Web
- Checkers29 tools — Validation & Stats
Recently added
- URL Slug from TitleURL Slug from Title — free online tool. Slugs should stay short, use hyphens instead of underscores, and drop stop words where possible. Works on mobile and offline.
- SQL Date Format ConverterSQL Date Format Converter — free online tool. 31/01/2026 and 01/31/2026 are the same day written in two conventions — and 03/04/2026 is ambiguous everywhere. Works on mobile and offline.
- UUID ValidatorUUID Validator — free online tool. Fast, private, no signup. Works on mobile and offline.
- URL Regex TesterURL Regex Tester — free online tool. The pattern is compiled by the browser’s own engine, so the result matches what JavaScript will do in your code. Works on mobile and offline.
- IPv4 ValidatorIPv4 Validator — free online tool. Fast, private, no signup. Works on mobile and offline.
- QR Code for URLQR Code for URL — free online tool. The pattern is generated in your browser and drawn to a canvas — nothing is uploaded. Works on mobile and offline.
- 4 Digit PIN Generator4 Digit PIN Generator — free online tool. Fast, private, no signup. Works on mobile and offline.
- Twitter Character CounterTwitter Character Counter — free online tool. Both totals are shown because the rules differ: some platforms count spaces, others do not. Works on mobile and offline.
How this site works
Every tool here is a single lightweight page. The maths runs in your own browser, so nothing you type is uploaded, logged or stored — there is no account, no cookie banner and no tracking pixel.
We check every calculator against worked examples before it goes live, and the pages are plain HTML so they load fast even on a weak mobile connection. If something ever gives a wrong result, we want to know about it.
Missing a tool you need? Tell us — requests shape what gets built next.