Universe Tools — online converters & calculators in one place

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Estimate your FIRE number, portfolio growth and years to financial independence using expenses, returns and savings. 100% local.

Calculate investment growth with a percentage rate and automatic reinvestment. Includes final value + breakdown table. 100% local.

Generate credible excuses with tone, severity and length filters. Local tool, no upload.

Analyze HTML for trackers, cookies hints, third-party scripts and form fields. Local tool, no upload.

Inspect readable cookies and flag tracking patterns. Local-only (no upload).

Generate name ideas with style filters, length limit and quick domain checks.

Estimate how much your money could be worth in 10, 20 and 30 years with annual return and inflation (real value).

Generate ready-to-use prompts for ChatGPT, Midjourney, Veo and Sora. Runs locally in your browser — no upload.

Paste text or extract text from a PDF and summarize it locally in your browser. No upload.

Convert a PDF page into a JPG image, or turn a JPG/PNG image into a PDF file, directly in your browser. No upload required.

Paste a link or a short text and generate a QR Code you can scan with your phone.

Generate an EAN-13 or EAN-8 barcode from a numeric code, directly in your browser.

Compute the required insulation thickness from thermal resistance (R), U-value, or thermal conductivity λ.

Estimate concrete volume in m³ and the number of cement bags needed for a slab.

Calculate your running training zones based on your FTP (critical power).

Calculates your basal metabolic rate (BMR) and total daily energy expenditure (TDEE).

Build a loan amortization schedule with either constant principal (linear) or constant payments (declining balance).

Quickly estimate the gross and net yield of a rental property from purchase price, monthly rent and yearly expenses.

Convert energy between Joules, food calories (kcal) and kilowatt-hours (kWh).

Convert a fraction (like 1/4) into a decimal and a percentage, or the other way around, in one click.

Estimate your target heart rate for training: moderate and intense zones.

Estimate the running cost of a device in watts: kWh used and total cost in €.

Convert an angle between degrees, slope percentage and radians instantly.

Estimate how many tiles you need based on room size, tile size and a waste percentage for cuts and breakage.

Estimate how many liters of paint you need based on surface area, coverage, and number of coats.

Calculate your gain or loss in percentage and amount on a crypto position from your entry price, current price and quantity.

Estimate notary or closing costs and the total purchase cost from the property price and a fee percentage.

Estimate the maximum loan amount you can afford based on your income, monthly expenses and a target debt ratio.

Convert your salary between annual, monthly and hourly based on your weekly working hours.

Estimate LED wattage from lumens, or lumens from LED wattage using an approximate efficiency.

Enter a distance and an average speed to estimate travel time (hours and minutes).

Convert decimal hours (7.5 h) to hours + minutes (7 h 30) and the other way around, in one click.

Convert euros to Bitcoin/crypto using your own manual price per unit. No API.

Compare products by calculating the price per kg, per liter or per item.

Convert a fraction (1/3, 2/5…) to decimal and back, handy for cooking, DIY or studying.

Convert lengths between meters and feet, useful for plans, real estate or US specifications.

Convert a speed between meters per second and kilometers per hour. Handy for weather, running or physics.

Convert an energy value between joules and kilocalories, useful for nutrition and physics.

Convert a pressure between bar and psi, ideal for tyres, mechanics or hydraulics.

Generate a SHA-256 hash of any text directly in your browser, without sending data anywhere.

Convert a date to an ISO week number, or get the Monday date of a given week.

Enter a savings goal and a duration, and see how much you should save every month to reach it.

Quickly split a bill or expense note between several people, with an optional tip.

See how much your monthly savings could grow with a fixed annual rate and compound interest.

Enter your income and main expenses to see your leftover money and the share of each category.

Convert a number of days into hours, minutes and seconds to better visualize a duration.

Understand file size by converting between bytes, KB, MB, GB and TB.

Convert an amount between euro and another currency using your own rate (e.g. 1 € = 1.08 $).

Convert a flow rate in litres per minute to m³/h (and back) for water networks, pumps, irrigation and plumbing.

Compute a volume from a surface (m²) and a height (m) for paint, concrete, boxes, screed or insulation.

Estimate your monthly loan payment from the loan amount, interest rate and duration.

Enter your date of birth and instantly calculate your age in years.

Convert centimeters to inches and inches to centimeters for DIY, screens or plans.

Convert liters to US gallons and gallons to liters for recipes, fuel or aquariums.

Convert hours to minutes or minutes to hours instantly.

Convert a speed between kilometers per hour and miles per hour, ideal when travelling.

Quickly calculate VAT, net (excluding tax) or gross (including tax), for any VAT rate.

Estimate net salary from gross salary (or the opposite) using a custom contribution rate.

Generate fake names, emails, addresses and phone numbers for tests or mockups.

Instantly convert distances for travel, running or technical data sheets.

Create strong passwords in one click, with uppercase, numbers and symbols, directly in your browser.

Quickly calculate your Body Mass Index (BMI) for a rough idea of your weight category.

Start a simple stopwatch or countdown for cooking, studying, workouts or focus sessions.

Enter names or options and pick a winner completely at random.

Quickly switch from Celsius to Fahrenheit for recipes, weather, or documents.

Quickly convert kilograms to pounds (lbs) and back again for sport, nutrition, or product sheets.

Enter an important date (trip, exam, project) and see how many days are left.

Calculate a percentage discount or increase: sales, price changes, etc.

Enter a list of values and get the average instantly.