App icon generator resizes one logo into every iOS, Android and PWA icon size, with AppIcon.appiconset, Contents.json and mipmap folders in one ZIP. Free and private.
Encode UTF-8 text to Base58 or decode Base58 strings used in crypto wallets and compact IDs - browser-based, no data leaves your device.
Calculate monthly payments, interest cost, origination fees, and payoff savings for a business loan with optional extra monthly payments.
Calculate Compound Annual Growth Rate (CAGR) for your investments. Find the annualized return rate between beginning and ending values over a time period.
Calculate compound interest on savings and investments. See how your money grows over time with monthly or yearly compounding and regular contributions.
Calculate CPM (Cost Per Mille), CPC, CTR, and eCPM for advertising campaigns. Essential tool for marketers, publishers, and advertisers.
Convert flat CSS to nested SCSS syntax instantly. Transform repetitive selectors into clean, maintainable SCSS with proper nesting, &-references for pseudo-classes and modifiers, and preserved media queries.
Convert currencies instantly with live exchange rates. Supports 150+ global currency pairs including USD, EUR, GBP, JPY, and emerging market currencies.
Calculate sale prices, find discount percentages, determine original prices, and compute stacked/double discounts. Essential for shopping and retail.
Calculate how much an appliance costs to run per day, month, and year. Enter wattage, usage hours, and electricity rate to estimate your power bill. Includes common appliance wattages.
Calculate your FIRE number - the investment portfolio size needed to retire early. Uses the 4% safe withdrawal rule. Shows years to FIRE, Coast FIRE number, Lean/Fat FIRE variants, and year-by-year savings projections.
Calculate fuel cost for any trip based on distance, vehicle MPG or L/100km, and gas price. Estimate road trip gas expenses with US and metric unit support.
Convert images to PDF online for free. Combine multiple JPG, PNG, WebP images into a single PDF with custom page size, orientation, and margins. 100% browser-based.
Create professional invoices online and download as PDF. Add your business details, client info, line items, tax, and discounts. Free invoice generator with no sign-up required.
Format and beautify JavaScript code instantly with customizable indentation, brace style, and line length settings. Works with ES6+, JSX, and modern JS syntax. Free and private.
Validate JavaScript syntax instantly in your browser with a real parser. Catch syntax errors with exact line and column numbers, check module or script code, and see statement stats. Free, no signup.
Parse, validate, and format JSON strings with detailed error reporting and line number highlighting. Instantly detect syntax errors in malformed JSON. Free online tool, no signup needed.
Find, test, and extract data from JSON using JSONPath expressions. Click any value to get its path, or query with JSONPath syntax.
Repair malformed JSON with one click by fixing common syntax issues like trailing commas, unquoted keys, and single-quote strings.
Convert JSON to Kotlin data classes instantly. Generate type-safe models with Gson or Moshi annotations, nullable types, and proper camelCase naming for Android and KMP projects.
Convert JSON to PHP array syntax and PHP arrays to JSON. Perfect for PHP developers working with APIs and configuration files.
Validate JSON data instantly with detailed error messages, line numbers, and auto-fix suggestions. Lint, format, and check JSON syntax online for free.
JSON-LD validator that checks schema markup for syntax errors, missing required properties, and invalid dates or prices. Paste JSON-LD or a full page, no signup.
LLM token cost calculator estimates API spend per call, day, month and year across OpenAI and Claude models, with prompt caching and batch discounts. Free, no signup.
Calculate Equated Monthly Installments (EMI) for home loans, car loans, personal loans, and education loans. View amortization schedule with principal vs interest breakdown.
Check Lua syntax instantly in your browser. Detect unbalanced blocks, unmatched brackets, and unterminated strings or comments with line numbers. Free heuristic Lua syntax validator, no signup required.
Look up the manufacturer or vendor of any network device from its MAC address OUI prefix. Identifies device maker, unicast/multicast type, global/local scope, and randomised MAC detection for iOS and Android.
Generate a valid MCP server config JSON for Claude Desktop and Claude Code in seconds. Add stdio or remote servers, env vars, and args with zero syntax mistakes.
Calculate the real cost of meetings based on attendees, duration, and average salary. See per-meeting, weekly, monthly, and annual cost breakdowns instantly.
Render Mermaid diagram syntax into SVG diagrams online. Supports flowcharts, sequence diagrams, class diagrams, Gantt charts, state diagrams, and more.
Calculate monthly mortgage payments, total interest, and view a full amortization schedule. Supports fixed-rate loans with customizable down payment, interest rate, and loan terms.
Format any number instantly with thousand separators, currency symbols, scientific notation, engineering notation, Indian numbering system, and data size conversion. Copy any format with one click.
Convert any number to its written English word form. Supports integers, decimals, negative numbers, ordinals, and currency formatting.
Generate OAuth 2.0 PKCE code verifiers and S256 code challenges instantly using the Web Crypto API. Build a ready-to-use authorization URL. Free, runs entirely in your browser.
Generate random numbers, integers, or decimals within custom ranges. Create multiple random numbers, shuffle sequences, and use cryptographically secure generation.
Calculate Return on Investment (ROI) instantly. Enter your investment cost and final return to see profit percentage, net gain, and annualized ROI for any investment period.
Convert between hourly, daily, weekly, biweekly, monthly, and annual salary. Calculate take-home pay with tax estimates, compare pay rates, and plan your finances.
Convert annual salary to hourly rate or hourly wage to yearly salary. See full pay breakdown by hour, day, week, bi-weekly, monthly, and annually with customizable work hours.
Calculate sales tax with separate state and local rates. Add tax to pre-tax prices or remove tax from tax-inclusive totals with a full breakdown.
Test semantic version ranges against a list of versions. Supports npm semver syntax including ^, ~, >=, <, ||, and exact versions. Free, browser-based, no install needed.
Calculate returns on Systematic Investment Plan (SIP). See how monthly investments grow over time with expected returns, total invested amount, and wealth gained.
Calculate the right battery storage size for your solar system or backup power needs. Compare LiFePO4, lithium-ion, AGM, and gel batteries with accurate amp-hour and cost estimates.
Calculate the return on investment and payback period for a residential solar installation. Factor in the 30% federal tax credit, state incentives, and rising electricity rates to see your true 25-year savings.
Compare the 25-year cost of solar vs staying on the grid. Factor in the 30% federal tax credit, loan payments, and rising utility rates to find your exact breakeven year and total savings.
Generate RSA (2048/4096-bit) and ECDSA (P-256/P-384) SSH key pairs entirely in your browser using the Web Crypto API. Your private key never leaves your device.
Calculate stock trading profit or loss including brokerage fees and taxes. Find net gain, return percentage, and break-even price for your trades.
Convert plain text to PDF online for free. Customize font size, page margins, and page size. Generate and download PDF files instantly. 100% browser-based.
Strip TypeScript type annotations, interfaces, generics, and type imports to get clean JavaScript. Handles common TS syntax patterns. Free, runs in-browser.
Uptime SLA calculator: turn 99%, 99.9% or 99.999% into allowed downtime per day, week, month and year. Reverse-check a real outage against your error budget. Free, no signup.
Calculate VAT by adding tax to net prices or removing VAT from gross prices with custom rates. Instantly see tax amount, net, and gross totals for any country.
Word pluralizer shows both the plural and singular form of any English word or phrase, covering irregular nouns, Latin loanwords, and f-to-ves exceptions. Free, browser-based.
Validate XML documents for well-formedness and syntax errors. Get instant feedback with line numbers, error details, and document statistics. Free online XML checker.
Test and evaluate XPath expressions against XML documents. Get instant results with syntax highlighting, matched nodes, and error feedback.
Format, beautify, and validate YAML documents with proper indentation. Convert between different YAML styles and detect syntax errors.
Validate YAML syntax instantly with detailed error messages and line numbers. Check Kubernetes manifests, Docker Compose files, CI/CD configs, and any YAML document for correctness.