All tools
Search or browse the complete ToolboxKart directory.
EMI Calculator
Calculate monthly loan EMI, total interest and total repayment from loan amount, annual interest rate and tenure.
Open tool →FinanceSIP Calculator
Estimate the future value of regular investments and separate the amount invested from estimated growth.
Open tool →FinanceGST Calculator
Add or remove GST from an amount and see the tax component clearly.
Open tool →FinanceCompound Interest Calculator
Project how an initial balance and regular contributions may grow with compound interest.
Open tool →FinanceROI Calculator
Calculate return on investment, gain or loss, and annualized ROI for a chosen holding period.
Open tool →FinanceLoan Repayment Calculator
Estimate scheduled loan payments and see how an optional extra monthly payment changes payoff time and interest.
Open tool →SEO & MarketingMeta Tag Generator
Generate a clean HTML head block for title, description, canonical, robots, Open Graph and Twitter sharing tags.
Open tool →SEO & MarketingRobots.txt Generator
Build a robots.txt file with user-agent rules, allowed paths, blocked paths and sitemap location.
Open tool →SEO & MarketingSERP Snippet Preview
Preview a modern search result snippet using your site name, URL, title and meta description.
Open tool →SEO & MarketingKeyword Density Checker
Analyze word frequency and keyword density in pasted text without sending the text to a server.
Open tool →SEO & MarketingXML Sitemap Generator
Turn a list of page URLs into a valid sitemap.xml with optional lastmod, changefreq and priority fields.
Open tool →SEO & MarketingSchema Markup Generator
Create basic JSON-LD for common schema types without hand-writing JSON.
Open tool →Developer & DataJSON Formatter & Validator
Format, minify, validate and optionally sort JSON keys entirely in your browser.
Open tool →Developer & DataBase64 Encoder / Decoder
Encode text to Base64 or decode Base64 back to UTF-8 text in your browser.
Open tool →Developer & DataUUID Generator
Generate one or many random UUID v4 identifiers with optional uppercase formatting.
Open tool →Developer & DataJWT Decoder
Decode JWT header and payload locally. Decoding does not verify the token signature or authenticity.
Open tool →Developer & DataURL Encoder / Decoder
Encode text for use in a URL component or decode percent-encoded text.
Open tool →Developer & DataRegex Tester
Test a JavaScript regular expression against sample text with selectable flags and match details.
Open tool →Writing & TextWord Counter
Count words, characters, sentences, paragraphs, lines and estimate reading time as you type.
Open tool →Writing & TextCase Converter
Convert text to uppercase, lowercase, title case, sentence case, camelCase, PascalCase, snake_case and kebab-case.
Open tool →Writing & TextText Diff Checker
Compare two text blocks line by line with options to ignore whitespace or letter case.
Open tool →Writing & TextCharacter Counter
Count characters, letters, digits, spaces, words and lines in any text.
Open tool →Image & FileImage Compressor
Compress JPG, PNG or WebP images locally in your browser by choosing output format and quality.
Open tool →Image & FileImage Resizer
Resize an image by exact pixel dimensions while optionally preserving its aspect ratio.
Open tool →Image & FileImage Converter
Convert JPG, PNG and WebP images to another browser-supported image format.
Open tool →Health & FitnessBMI Calculator
Calculate body mass index from height and weight and see the standard adult BMI category.
Open tool →Health & FitnessBMR Calculator
Estimate basal metabolic rate using the Mifflin–St Jeor equation.
Open tool →Health & FitnessCalorie Needs Calculator
Estimate daily calorie needs from BMR, activity level and a simple weight-change goal.
Open tool →BusinessProfit Margin Calculator
Calculate profit per unit, gross margin and markup from cost and selling price.
Open tool →BusinessMarkup Calculator
Apply a markup to cost and see the resulting selling price, profit and gross margin.
Open tool →BusinessBreak-Even Calculator
Find the unit sales and revenue needed to cover fixed costs, with an optional target profit.
Open tool →BusinessCommission Calculator
Calculate commission and take-home sales value using a rate plus optional fixed bonus.
Open tool →EducationGPA Calculator
Calculate weighted GPA from course grades and credit hours on a 4.0 scale.
Open tool →EducationGrade Calculator
Calculate a weighted course grade from assignment scores and weights, or estimate the score needed on a final item.
Open tool →EducationPercentage Calculator
Solve common percentage questions: percent of a number, what percent, and percentage change.
Open tool →EducationUnit Converter
Convert common length, mass, temperature and data units with a simple category-first workflow.
Open tool →AI & Agent ToolsAI API Cost Calculator
Estimate LLM API cost from your own token prices, token usage and request volume so model pricing never goes stale.
Open tool →AI & Agent ToolsToken Estimator
Estimate token count from pasted text using character and word heuristics, with a clear reminder that exact counts depend on the model tokenizer.
Open tool →EngineeringOhm’s Law Calculator
Enter any two of voltage, current, resistance and power to solve the remaining values.
Open tool →EngineeringVoltage Divider Calculator
Calculate unloaded or loaded resistor-divider output voltage and branch current.
Open tool →EngineeringResistor Color Code Calculator
Decode common 4-band and 5-band resistor colors into resistance and tolerance.
Open tool →EngineeringElectrical Power Calculator
Calculate electrical power, current, voltage or energy for a simple DC/single-phase load.
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