PDF ↔ JPG Converter
Converter
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.
Free tools • No sign up • No intrusive ads
Your everyday tools gathered on a single page.
Universe Tools is a collection of simple, fast online tools
accessible in one click: converters, calculators, generators,
security, health, organization… everything is grouped on a single page.
Start with the
converters,
improve your
security,
track your
health
or explore the
organization & misc tools.
Main tools
On this single page, you can find all your everyday tools, grouped and instantly accessible, without any sign up.
Pro tip: bookmark this page in your browser, on both desktop
and smartphone.
Suggest a new tool
Misc
Missing a tool? Send us your idea in a few seconds.
QR Code generator
Misc
Paste a link or a short text and generate a QR Code you can scan with your phone.
TDEE – Daily calorie needs
Health
Calculates your basal metabolic rate (BMR) and total daily energy expenditure (TDEE).
Linear / declining amortization
Finance
Build a loan amortization schedule with either constant principal (linear) or constant payments (declining balance).
Rental yield calculator
Finance
Quickly estimate the gross and net yield of a rental property from purchase price, monthly rent and yearly expenses.
Energy: Joules ↔ calories ↔ kWh
Converter
Convert energy between Joules, food calories (kcal) and kilowatt-hours (kWh).
Fraction ↔ Decimal ↔ Percentage
Converter
Convert a fraction (like 1/4) into a decimal and a percentage, or the other way around, in one click.
Target heart rate
Health
Estimate your target heart rate for training: moderate and intense zones.
Electricity consumption
Finance
Estimate the running cost of a device in watts: kWh used and total cost in €.
Angle converter
Converter
Convert an angle between degrees, slope percentage and radians instantly.
Tile calculator (m² + waste)
Misc
Estimate how many tiles you need based on room size, tile size and a waste percentage for cuts and breakage.
Paint calculator
Organisation
Quickly estimate how many liters of paint you need based on surface and coverage.
Crypto gains & losses (%)
Finance
Calculate your gain or loss in percentage and amount on a crypto position from your entry price, current price and quantity.
Notary / closing costs
Finance
Estimate notary or closing costs and the total purchase cost from the property price and a fee percentage.
Simple borrowing capacity
Finance
Estimate the maximum loan amount you can afford based on your income, monthly expenses and a target debt ratio.
Annual ↔ monthly ↔ hourly salary
Finance
Convert your salary between annual, monthly and hourly based on your weekly working hours.
Lumens ↔ Watts (LED)
Converter
Estimate LED wattage from lumens, or lumens from LED wattage using an approximate efficiency.
Travel time calculator
Converter
Enter a distance and an average speed to estimate travel time (hours and minutes).
Decimal hours ↔ hours + minutes
Converter
Convert decimal hours (7.5 h) to hours + minutes (7 h 30) and the other way around, in one click.
€ ↔ Bitcoin / Crypto converter
Converter
Convert an amount in euros to Bitcoin/crypto (or the other way around) using your own price per unit.
Unit price calculator
Finance
Compare products by calculating the price per kg, per liter or per item.
Fraction ↔ decimal converter
Converter
Convert a fraction (1/3, 2/5…) to decimal and back, handy for cooking, DIY or studying.
Meters ↔ feet
Converter
Convert lengths between meters and feet, useful for plans, real estate or US specifications.
Speed m/s ↔ km/h
Converter
Convert a speed between meters per second and kilometers per hour. Handy for weather, running or physics.
Joules ↔ kilocalories
Converter
Convert an energy value between joules and kilocalories, useful for nutrition and physics.
Pressure bar ↔ psi
Converter
Convert a pressure between bar and psi, ideal for tyres, mechanics or hydraulics.
SHA-256 hash
Security
Generate a SHA-256 hash of any text directly in your browser, without sending data anywhere.
Date ↔ week number
Organization
Convert a date to an ISO week number, or get the Monday date of a given week.
Savings goal simulator
Finance
Enter a savings goal and a duration, and see how much you should save every month to reach it.
Bill splitter
Finance
Quickly split a bill or expense note between several people, with an optional tip.
Monthly savings simulator
Finance
See how much your monthly savings could grow with a fixed annual rate and compound interest.
Monthly budget calculator
Finance
Enter your income and main expenses to see your leftover money and the share of each category.
Days → hours / minutes converter
Converter
Convert a number of days into hours, minutes and seconds to better visualize a duration.
KB / MB / GB / TB converter
Converter
Understand file size by converting between bytes, KB, MB, GB and TB.
Currency converter (manual rate)
Converter
Convert an amount between euro and another currency using your own rate (e.g. 1 € = 1.08 $).
Flow L/min ↔ m³/h
Converter
Convert a flow rate in litres per minute to m³/h (and back) for water networks, pumps, irrigation, etc.
m² ↔ m³ Converter
Converter
Compute a volume from a surface (m²) and a height (m) for paint, concrete, boxes, etc.
Loan payment calculator
Finance
Estimate your monthly loan payment from the amount, interest rate and duration.
Age calculator
Misc
Enter your date of birth and get your age in years instantly.
Converter cm ↔ inches
Converter
Convert centimeters to inches and back, for DIY, screens or plans.
Converter liters ↔ gallons
Converter
Convert liters to US gallons and back for recipes, fuel or aquariums.
Converter hours ↔ minutes
Converter
Convert hours to minutes or minutes to hours in a second.
Converter km/h ↔ mph
Converter
Convert a speed between km/h and miles per hour, ideal when travelling.
VAT calculator
Finance
Quickly calculate VAT, net (excluding tax) or gross (including tax), for any VAT rate.
Net ↔ gross salary
Finance
Estimate net salary from gross salary (or the opposite) using a custom contribution rate.
Fake data generator
Misc
Generate fake names and emails for tests or mockups, without using real data.
km ↔ miles converter
Converter
Instantly convert distances for travel, running or technical data sheets.
Password generator
Security
Create strong passwords in one click, with uppercase, numbers and symbols, directly in your browser.
BMI calculator
Health
Quickly calculate your Body Mass Index (BMI) for a rough idea of your weight category.
Stopwatch & timer
Misc
Start a simple stopwatch or countdown for cooking, studying, or workouts.
Random picker
Misc
Enter names or options and pick a winner completely at random.
°C ↔ °F converter
Converter
Quickly switch from Celsius to Fahrenheit for recipes, weather, or documents.
kg ↔ lb converter
Converter
Quickly convert kilograms to pounds (lbs) and back again for sport, nutrition, or product sheets.
Countdown (days)
Organization
Enter an important date (trip, exam, project) and see how many days are left.
Percentage calculator
Converter
Calculate a percentage discount or increase: sales, price changes, etc.
Average calculator
Misc
Enter a list of values and get the average instantly.
Converters
Energy converter: Joules ↔ calories ↔ kWh
Enter a value in Joules, in food calories (kcal) or in kilowatt-hours (kWh) and the converter will automatically compute the other two units. Conversion used: 1 kcal = 4,184 J, 1 kWh = 3,600,000 J.
Reminder: 1 kcal ≈ 4,184 J (food calorie) and 1 kWh = 3,600,000 J.
Values are rounded for readability.
Fraction ↔ Decimal ↔ Percentage converter
Enter a fraction (e.g. 1/4), a decimal (e.g. 0.25) or a percentage (e.g. 25) and the converter will compute the two other forms automatically.
Example: 1/4 → 0.25 → 25 %.
For decimals, an approximate fraction is computed (denominator ≤ 100).
Angle converter: degrees ↔ % slope ↔ radians
Convert any angle instantly between degrees, slope percentage and radians. All calculations happen locally in your browser.
Formulas:
• % slope = tan(°) × 100
• radians = degrees × π/180
• degrees = radians × 180/π
• % slope = tan(°) × 100
• radians = degrees × π/180
• degrees = radians × 180/π
Lumens ↔ Watts (LED)
This converter gives you an approximate LED wattage from a lumen value, and the other way around. It uses an average efficiency of ≈ 90 lumens per watt, which may vary depending on the LED quality.
Example: an 800 lm LED bulb is roughly 8.9 W with 90 lm/W efficiency.
Real values depend on each LED model.
Travel time calculator
Estimate how long it takes to cover a given distance at a given average speed. Useful for car trips, cycling or project planning.
This is an ideal estimate (constant speed, no stops, no traffic).
1 mile ≈ 1.609 km.
Decimal hours ↔ hours + minutes
Convert decimal hours (e.g. 7.5 h) to hours + minutes (7 h 30), or the other way around. Useful for timesheets, payroll or project tracking.
Examples: 7.5 h → 7 h 30 • 1.25 h → 1 h 15
7 h 30 → 7.50 h • 1 h 15 → 1.25 h.
Simple rounding to the nearest minute.
Euro ↔ Bitcoin / Crypto converter (manual rate)
Enter an amount in euros, the price of 1 unit of Bitcoin or any other crypto, then choose the conversion direction. No API is used, everything runs locally.
Example: if 1 BTC = €65,000, then €100 ≈ 0.00154 BTC.
This is an indicative converter and does not replace an exchange platform.
PDF ↔ JPG converter
Convert a PDF page to a JPG image or turn an image (JPG/PNG) into a PDF file. Everything runs locally in your browser, with no files sent to any server.
Limitations: for now, the PDF → JPG conversion only processes the first page.
The tool supports JPG and PNG images for conversion to PDF.
Fraction ↔ decimal converter
Enter a fraction like 1/3 or a decimal number like 0.75,
and the tool converts to the other format. Useful for cooking, DIY or math exercises.
Tip: you can use comma or dot for decimals. Fractions are simplified (approximation).
Meters ↔ feet converter
Convert lengths between meters and feet. Useful for blueprints, construction or reading imperial-unit documentation.
Value used: 1 m = 3.28084 ft (approx.).
Speed converter m/s ↔ km/h
Simple conversion between meters per second (m/s) and kilometers per hour (km/h). Handy for weather, running or physics.
Formula: 1 m/s = 3.6 km/h.
Energy converter Joules ↔ kilocalories
Convert an energy value between joules (J) and kilocalories (kcal). Useful for nutrition labels, sport or physics.
Value used: 1 kcal = 4,184 J (“food calorie”).
Pressure converter bar ↔ psi
Convert a pressure between bar and psi, for tyres, hydraulic systems or compressors.
Value used: 1 bar ≈ 14.5038 psi.
Time converter: days → hours / minutes / seconds
Enter a number of days to get the equivalent in hours, minutes and seconds. Useful to quickly understand project duration, holidays or deadlines.
1 day = 24 hours = 1,440 minutes = 86,400 seconds.
KB / MB / GB / TB converter
Enter a size and its starting unit (bytes, KB, MB, GB or TB) to get the equivalents in all other units. Perfect to quickly understand how large a file really is.
Conversions use the common binary units in computing:
1 KB = 1024 bytes, 1 MB = 1024 KB, and so on.
Currency converter (manual rate)
Enter an amount, choose the conversion direction and set your own rate, for example: 1 € = 1.08 $. No API call, everything is calculated locally in your browser.
Example: with a rate of 1 € = 1.08 $, 100 € becomes 108 $.
The other way around, 108 $ at this rate equals 100 €.
Flow rate converter L/min ↔ m³/h
Enter a flow rate in litres per minute (L/min) or in cubic meters per hour (m³/h) to get the other value. Useful for water networks, pumps, irrigation, etc.
Formulas used: m³/h = L/min × 0.06 • L/min ≈ m³/h × 16.67.
Surface → volume converter (m² ↔ m³)
Enter a surface in m² and a height in meters to get the volume in m³. Useful to estimate concrete, paint or the usable volume of a room.
Formula used: volume (m³) = surface (m²) × height (m).
Distance converter km ↔ miles
Simple and immediate conversion. 1 km ≈ 0.621371 mile. All calculations are done directly in your browser.
Note: this converter uses the standard value 1 km = 0.621371 mile.
Need another kind of tool? Also explore security (passwords), health (BMI) or organization & misc.
°C ↔ °F converter
Fast conversion between Celsius and Fahrenheit for recipes, weather, or data sheets.
Formulas used: °F = °C × 9/5 + 32 and °C = (°F − 32) × 5/9.
Percentage calculator
Quickly calculate a percentage discount or increase (sales, price rise, discount, etc.).
Example: 100 € with a 20% discount → 80 €.
100 € with a 20% increase → 120 €.
Weight converter kg ↔ lb
Simple conversion between kilograms and pounds. All calculations are done directly in your browser.
Value used: 1 kg = 2.20462 lb (approx.).
Length converter cm ↔ inches
Convert centimeters to inches and back. 1 inch = 2.54 cm.
Conversion used: 1 in = 2.54 cm (standard value).
Volume converter liters ↔ gallons (US)
Convert liters to US gallons and the other way around. 1 L ≈ 0.264172 gallon (US).
This tool uses the US gallon: 1 L ≈ 0.264172 gal (US).
Time converter hours ↔ minutes
Convert hours to minutes or minutes to hours. Fill one of the fields, the other will be computed.
1 hour = 60 minutes. You can use decimals (e.g. 1.5 h).
Speed converter km/h ↔ mph
Convert a speed between kilometers per hour (km/h) and miles per hour (mph). Helpful for driving abroad or reading foreign specs.
Conversion used: 1 mph ≈ 1.60934 km/h.
Finance & budget
Linear / declining amortization calculator
Enter the loan amount, annual interest rate and duration in years. This tool generates a yearly amortization table using either linear amortization (constant principal) or a declining balance with constant payments (standard amortizing loan).
Simple approximation that ignores insurance, fees and special bank
conditions. Amounts are rounded to two decimals. This is not financial advice.
Rental yield calculator
Enter the purchase price, the monthly rent and yearly expenses (property tax, HOA fees, maintenance…). The tool computes gross yield and net yield.
Formulas used:
• Gross yield = (yearly rent / purchase price) × 100
• Net yield ≈ ((yearly rent − yearly expenses) / purchase price) × 100
• Gross yield = (yearly rent / purchase price) × 100
• Net yield ≈ ((yearly rent − yearly expenses) / purchase price) × 100
Electricity consumption W → kWh → €
Estimate the electricity consumption of a device from its power in watts, usage time and kWh price. Everything is calculated locally in your browser.
Example: a 1,000 W device used 2 h/day for 30 days
at 0.20 €/kWh consumes ≈ 60 kWh, i.e. ≈ 12 €.
Crypto gains & losses (%)
This tool helps you estimate your gain or loss on a crypto position based on your buy price, the current price and optionally the quantity you hold. Results are indicative only and do not constitute financial advice.
Example: if you bought 1 BTC at €25,000 and it is now worth €32,000, your
gain is roughly +28%.
This tool does not account for fees, taxes, spreads or FX effects.
Notary / property purchase costs
This tool helps you estimate notary or closing costs and the total purchase cost from the property price and a fee percentage. Results are provided as a rough indication only and do not replace a personalized calculation from a notary, solicitor or your bank.
Examples (for France): resale properties often have around 7–8% notary fees,
new builds around 2–3%.
Enter the percentage you want to use for your own situation.
Simple borrowing capacity
This tool provides an estimate of your borrowing capacity based on your monthly income, monthly expenses and a target debt ratio. It is only an indication and does not replace a detailed study from your bank.
Assumptions: fixed rate, constant monthly payments, 12 months per year.
This is a rough estimate and does not include insurance,
fees or your bank’s detailed lending criteria.
Annual ↔ monthly ↔ hourly salary
This tool converts your salary between annual, monthly and hourly, based on your weekly working hours. It is a simple estimate assuming 52 weeks per year.
Assumptions: 12 months/year, 52 weeks/year.
This is a rough estimate and does not account for holidays,
bonuses or specific contract rules.
Unit price calculator (price per kg / liter / item)
Enter the total price paid and the quantity, then choose the unit to get the price per kg, per liter or per item. Useful to compare products on supermarket shelves.
Example: €5.49 for 0.75 L → about €7.32/L.
Savings Goal Simulator
Enter a target amount and a number of months. The calculator tells you how much to save per month.
Example: €5,000 in 12 months → €416.67/month.
Monthly savings simulator
Enter how much you can save every month, a fixed annual interest rate and a duration in years. The tool computes your final capital with monthly compound interest, along with total contributions and interests earned.
Approximate calculation using monthly compounding.
Formula: constant monthly deposits + monthly capitalization of the
annual rate you entered. This is not financial advice.
Savings goal simulator
Enter a total savings goal and a duration in months, then see how much you need to save every month to reach it.
Example: for €5,000 over 12 months → €416.67 / month.
Bill splitter
Split a bill or expense note between several people. You can also add an optional tip.
Monthly budget calculator
Enter your monthly income and your main expenses by category. The tool will compute the total expenses, your leftover money and the percentage of each category relative to your income.
You can write one expense per line, with or without a label.
Valid examples:
Rent: 900 or simply 900.
Percentages are calculated relative to your monthly income.
Loan monthly payment calculator
Enter the loan amount, annual interest rate and duration to estimate your monthly payment. The calculation is done locally in your browser.
This is an indicative calculation using a standard amortizing loan formula.
It does not include insurance, fees or special conditions from your bank.
VAT calculator
Compute net, VAT or gross price instantly.
Net ↔ Gross salary calculator
Estimate net salary from gross salary (or vice versa).
Security
SHA-256 hash (text fingerprint)
Enter any text and generate its SHA-256 fingerprint. The computation is done locally in your browser, with no data sent to any server.
Important: don’t paste here real passwords you actually use. Prefer a dedicated
password manager.
Secure password generator
Generate a strong password in your browser. Nothing is sent to any server. You can adjust length and characters.
16 characters
Click “Generate” to create a password.
For better security, combine this generator with a password manager
(e.g. Bitwarden, KeePass, 1Password…).
Health
TDEE Calculator (Daily calorie needs)
Calculates your basal metabolic rate (BMR) using the Mifflin–St Jeor formula and your total daily calorie needs (TDEE) based on your activity level.
🔥 TDEE = total calories you burn daily.
📌 BMR = basal metabolism (energy your body uses at rest).
📌 BMR = basal metabolism (energy your body uses at rest).
Target heart rate (training)
This tool estimates your target heart rate for exercise based on your age, using the simple formula 220 − age for maximum heart rate. Results are indicative only and do not replace medical advice.
Typical adult guidelines:
moderate zone ≈ 50–70 % of max HR,
intense zone ≈ 70–85 % of max HR.
These values are approximations and do not replace a medical opinion or a supervised stress test.
These values are approximations and do not replace a medical opinion or a supervised stress test.
BMI calculator (Body Mass Index)
Calculate your BMI based on your height and weight. This gives a general indication, but does not replace medical advice.
Classic adult thresholds: <18.5 (underweight), 18.5–24.9 (normal),
25–29.9 (overweight), ≥30 (obesity). Interpretations may vary
depending on the source and medical context.
Organization & misc
QR Code generator
Generate a QR Code from a link, a short text or a small note. You can then scan it with your smartphone or save it as an image.
The QR Code is generated locally in your browser.
On mobile: long-press to save the image • On desktop: right-click → Save image.
Tile calculator (m² + waste)
Estimate how many tiles you need for a room based on its size, the tile dimensions and a waste percentage (cuts, broken tiles, extra stock).
The calculation always rounds up to the next whole tile, so you have some
extra stock. Increase the waste percentage for complex rooms (angles, many
cuts, patterns, etc.).
Paint calculator (m² → liters)
Enter the surface area and your paint's coverage (m²/L). The tool estimates the total amount of paint needed and the number of cans to buy.
Example: for 32 m² with a coverage of 10 m²/L and two coats, you need about 6.4 L.
Suggest a new tool
Have an idea for a tool that would fit Universe Tools? Describe it in a few lines and send it to us. It helps us decide what to build next.
This button opens your e-mail app with a prefilled message.
No automatic data is sent.
Date ↔ ISO week number
Convert a date to its ISO week number (week 1 to 53), or find the Monday date of a given week and year.
Uses ISO 8601: week 1 is the week with the first Thursday of the year.
Monday is considered the first day of the week.
Stopwatch & timer
Use a simple stopwatch or a countdown timer for cooking, pomodoro sessions, or workouts.
00:00
Random picker
Write several names separated by commas and pick a random winner.
Countdown in days
Choose an important date (trip, exam, project, birthday) and see how many days are left or how long ago it was.
Calculations use today's date (your device's local time).
Average calculator
Enter a list of numbers (grades, amounts, time, etc.) and get the average in one click.
You can separate values with commas, spaces, or line breaks.
Non-numeric values are ignored.
Age calculator
Enter your date of birth to get your age in years. The calculation is done locally in your browser.
The result is based on today’s date (your device local time) and is only indicative.
Fake data generator (names & emails)
Generate fake names and email addresses to fill test forms, mockups or demo databases, without using any real identity.
All generated names and emails are fictional and meant only for testing.