Free Online Tools for Everyday Tasks

Work out how many calories you need per day from your age, gender, height, weight and activity level. See your BMR, your TDEE and calorie targets for losing or gaining weight — all based on the Mifflin-St Jeor equation.

Build a .gitignore file for your stack. Pick from 30+ templates covering languages, frameworks, editors, IDEs and operating systems, or choose a quick preset for Web, Mobile, Backend or Data/ML. Add custom patterns and download the file.

Create QR codes for URLs, plain text, email, phone, SMS, Wi-Fi and vCard. Tune size, margin, error correction level and colors. Download as PNG for digital use or as SVG for print. Also supports ten barcode formats including CODE128, EAN and UPC.

Find the final price after a discount and see exactly how much you save. Optionally add sales tax — applied to the discounted price, the way it works at checkout. Works for any store, any currency.

Estimate your VO2 max — the best single measure of aerobic fitness — using the Rockport 1-mile walk test. Walk a mile as fast as you can, record your time and heart rate, and see how you compare to age and gender norms.

Give the generator a few example strings that should match — and optionally some that should not — and get a working regular expression. It analyses the common structure, produces a pattern with a plain-English explanation and validates the result against your negative examples.

Measure the return on any investment or project. Two modes: enter an initial and final amount for a simple ROI, or enter revenue and cost for a business return. See the profit, margin and ROI percentage together.

Compute MD5, SHA-1, SHA-256 and SHA-512 hashes for any text — all four at once. SHA algorithms use the browser's native Web Crypto API; MD5 runs through a local implementation. Everything happens on your device.

Convert between units of length, weight, temperature, area, volume, speed, time, data, pressure and energy. Enter a value once and see it converted to every other unit in the same category, or swap the direction with one click.

Encode or decode URLs and query parameters. Two modes: Component encodes everything including ?, & and = (use it for query values), Full URL preserves reserved characters (use it for complete URLs). Result updates as you type.

Estimate your ideal body weight using four classic formulas — Devine, Robinson, Miller and Hamwi — and see the average. Enter your height and gender to get all four results side by side, plus the clinical reference used in medical settings.

Find your exact age in years, months and days from your birth date. Enter any target date — today, a past date or a future one — and see how many days and weeks you have been alive. Handles February 29 birthdays correctly.

Work out your Total Daily Energy Expenditure and the protein, carb and fat targets that match your goal. Choose lose, maintain or gain — the calculator adjusts both calories and macro split. Uses the Mifflin-St Jeor equation.

Check whether your text and background colors pass WCAG 2.1 AA and AAA. See the contrast ratio, live preview at three text sizes and pass/fail status for normal text, large text and UI components. Swap foreground and background with one click.

Predict your next period, ovulation date and fertile window from your last period and average cycle length. See your next three period dates and the current day of your cycle. Based on the standard luteal-phase method used by cycle trackers.

Count words, characters (with and without spaces), sentences, paragraphs and pages as you type. See estimated reading and speaking time, plus live counters for Twitter, Instagram, LinkedIn, YouTube and meta description limits.

Generate cryptographically secure UUIDs — up to 100 per click. Choose version 4 (fully random) or version 7 (time-ordered, sortable by creation time). Toggle uppercase or lowercase, with or without dashes. Copy results with one click.

Build a full set of meta tags with live previews of how the page will look in Google search and when shared on social media. Fill in title, description, URL, social image, site name, Twitter handle and OG type — copy the whole block and paste it into your head section.

Work out percentages in seconds — find X% of a number, see what percent one value is of another, reverse a percentage, measure the change between two values, or add and subtract a percent. The result updates live as you type.

Find letters from another alphabet inside your text: Latin inside Cyrillic, Cyrillic inside Latin, Greek symbols, and invisible marks. Pick the alphabet and the tool highlights every match.

Find the final price after a discount and see exactly how much you save. Optionally add sales tax — applied to the discounted price, the way it works at checkout. Works for any store, any currency.

Split the bill and work out the tip in one step. Enter the bill, choose a tip percentage and set how many people are paying. See the tip amount, the total and exactly what each person owes.

Add tax to a net price or extract it from a gross price — works for sales tax, VAT and GST at any rate. See the net, tax and gross amounts side by side so you can verify the calculation instantly.

Convert between hourly, daily, weekly, monthly and annual pay in one place. Set your actual hours and days per week to get precise equivalents — no need to assume the standard 40-hour week.