Free online tools by TechTenStein — calculators, generators and checkers for businesses, marketers and developers. No signup, no cost, and most run entirely in your browser.
Website SEO Audit & Score CheckerGet an instant on-page SEO score for any website.Website Cost CalculatorEstimate what a website will cost to build.GST Calculator (India)Add or remove GST at 5%, 12%, 18% or 28%.EMI / Loan CalculatorMonthly EMI, total interest and payment.Number to Words (Indian Rupees)Convert amounts to words for cheques & invoices.Word & Character CounterCount words, characters, sentences & reading time.Strong Password GeneratorCreate secure random passwords instantly.QR Code GeneratorMake a downloadable QR code for any link or text.Image CompressorCompress JPG/PNG/WebP in your browser, privately.Business Name GeneratorGenerate brandable business name ideas.Free Invoice GeneratorCreate and download a professional invoice.Privacy Policy GeneratorGenerate a privacy policy for your website.Case ConverterConvert text to UPPER, lower, Title or sentence case.Favicon GeneratorTurn any image into favicon PNGs for your site.Color Picker & Palette GeneratorPick colors and get HEX, RGB, HSL and a palette.CSS Gradient GeneratorCreate CSS gradients with live preview and code.UTM Campaign Link BuilderBuild trackable UTM links for your campaigns.Percentage CalculatorWork out percentages, increases and decreases.Age CalculatorCalculate exact age in years, months and days.BMI CalculatorCalculate Body Mass Index and category.Unit ConverterConvert length, weight and temperature units.Base64 Encode / DecodeEncode or decode Base64 text instantly.JSON Formatter & ValidatorFormat, minify and validate JSON in your browser.Lorem Ipsum GeneratorGenerate placeholder text for designs and mockups.URL Slug GeneratorTurn any title into a clean, SEO-friendly URL slug.Meta Tag GeneratorGenerate SEO meta and Open Graph tags.Discount CalculatorCalculate sale price and how much you save.Text Diff CheckerCompare two texts and see exactly what changed.Hash Generator (SHA)Generate SHA-1/256/384/512 hashes in your browser.UUID GeneratorGenerate random UUID v4 identifiers.URL Encode / DecodeEncode or decode URL components instantly.HTML Entity Encode / DecodeConvert HTML special characters to/from entities.Image to Base64Convert an image into a Base64 data URI.Color Contrast CheckerCheck WCAG color contrast for accessibility.CSS Box Shadow GeneratorCreate CSS box shadows with live preview.Robots.txt GeneratorGenerate a robots.txt file for your website.Tip & Bill Split CalculatorWork out tips and split the bill between people.Days Between DatesCount the days, weeks and months between dates.Number Base ConverterConvert between binary, octal, decimal and hex.Roman Numeral ConverterConvert numbers to Roman numerals and back.Random Number & PickerPick a random number or item from a list.Online Stopwatch & TimerA simple online stopwatch and countdown timer.