Another steady batch since the last update - nothing as big as the 120-tool drop, but a solid spread of new developer utilities, image converters, and a few calculators that were on the list for a while. Here's everything that's new, grouped by category.
🛠️ New Tools
Developer
- curl Command Builder - Build a properly shell-escaped curl command from a method, URL, headers, and request body.
- .gitignore Generator - Generate a combined .gitignore file from common languages, frameworks, and editors with a simple checklist.
- Hash Generator - Generate MD5, SHA-1, SHA-256, and SHA-512 hashes from any text, computed locally with the Web Crypto API.
- JSON Diff Checker - Compare two JSON objects and see exactly which keys were added, removed, or changed.
- JWT Decoder - Decode a JWT's header and payload instantly and check its expiration, computed locally in your browser.
- Mock / Fake JSON Data Generator - Generate realistic fake JSON test data with a field picker and an optional seed for reproducible results.
Conversion & Encoding
- iCal/ICS Event Generator - Generate a standard .ics calendar event file, importable into Google Calendar, Outlook, and Apple Calendar.
- Number to Words Converter - Convert a number into written-out English words - perfect for checks, invoices, and legal documents.
- ROT13 / Caesar Cipher - Encode or decode text with ROT13 or a custom Caesar cipher shift, computed instantly in your browser.
- vCard Generator - Generate a standard vCard (.vcf) contact file, ready to import into any contacts app.
Image
- AVIF to JPG Converter - Convert an AVIF image to JPG or PNG entirely in your browser using the Canvas API.
- HEIC to JPG Converter - Convert a HEIC/HEIF iPhone photo to JPG or PNG entirely in your browser.
- Image Splitter - Split an image into equal rows and columns - perfect for Instagram grid posts or puzzle tiles.
- SVG Optimizer - Strip comments, metadata, and unnecessary whitespace from SVG markup to shrink file size.
Web
- Color Contrast Checker - Check the contrast ratio between two colors against WCAG AA and AAA accessibility standards.
Fun & Random
- ASCII Text Banner Generator - Turn any word or short phrase into large block-letter ASCII art, ready to paste into code, READMEs, or chat.
- Meme Text Generator - Add classic bold, white, black-outlined top and bottom text to any image and download the result.
- Sudoku Generator - Generate a Sudoku puzzle with a guaranteed unique solution at three difficulty levels.
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🧮 New Calculators
Financial
- Capital Gains Tax Calculator - Estimate the federal tax owed on an investment or asset sale, covering both short-term and long-term gains.
- Dollar-Cost Averaging (DCA) Calculator - Project the future value of investing a fixed amount on a regular schedule versus a lump sum today.
- Freelance Hourly Rate Calculator - Work backward from your target income, time off, expenses, and a tax reserve to the rate you actually need to charge.
- Net Worth Calculator - Calculate your net worth by adding up your assets and subtracting your liabilities.
- Reverse Mortgage Calculator - Get a ballpark estimate of how much cash a reverse mortgage could make available from your home equity.
- Rule of 72 Calculator - Estimate how many years it takes an investment to double, triple, or quadruple at a given annual return.
Health
- A1C to Average Blood Glucose Calculator - Convert between A1C percentage and estimated average glucose, using the ADAG study formula.
- Blood Pressure Category Calculator - See which American Heart Association category your systolic and diastolic reading falls into.
- Steps to Calories & Miles Calculator - Convert a daily step count into estimated distance walked and calories burned.
- VO2 Max Calculator - Estimate your aerobic fitness from your age and resting heart rate using the Uth-Sorensen-Overgaard-Pedersen formula.
- Waist-to-Hip Ratio Calculator - Calculate your WHR from two tape-measure readings and compare it to WHO health-risk categories.
Everyday & Home
- EV Charging Cost Calculator - Estimate the cost of charging your EV and compare the cost per mile against a gas car.
- Insulation R-Value Calculator - Add up the R-values of a wall or ceiling assembly's layers and estimate heat loss for a given area.
- Paint Calculator - Calculate how many gallons of paint you need for a room based on its dimensions and number of coats.
- Pool Volume Calculator - Calculate how many gallons your pool holds - supports rectangular and circular/round pools.
- Solar Panel Payback Calculator - Estimate how many years it takes a home solar system to pay for itself, plus 25-year lifetime savings.
- Female Delusion Calculator - Enter minimum height, income, and age standards and see what share of U.S. men meet all three.
- Male Delusion Calculator - Enter maximum BMI and age standards and see what share of U.S. women meet both.
That's everything new since the last post. As always, everything above is free to use with no sign-up required. More is on the way.