How to merge PDF files for free?

Use Alleex's free PDF Merge tool. Upload multiple PDF files, drag to reorder, and click Merge. No sign-up required, works directly in your browser.

How to compress PDF online?

Upload your PDF to Alleex's Compress PDF tool. It reduces file size by optimizing the PDF structure. Free, no watermarks, no file size limits.

How to remove background from image?

Use Alleex's AI Background Remover. Upload any photo and the AI automatically removes the background, creating a transparent PNG. Free and instant.

Is Alleex free to use?

Yes, Alleex offers 400+ free online tools including PDF tools, calculators, AI image tools, and developer tools. No sign-up or installation required.

How to calculate mortgage payments?

Use Alleex's Mortgage Calculator. Enter home price, down payment, interest rate, and loan term to see monthly payments, total interest, and amortization schedule.

All Calculators & Tools

Free online calculators for finance, math, science, health, and more. No sign-up required.

💰Financial

Mortgage Calculator

Monthly payments, amortization & total cost

Compound Interest

Calculate how investments grow over time

Loan Calculator

Monthly payments & total cost for any loan

Savings Goal

How long to save for your goal

Investment Return

Project investment growth over time

Tip Calculator

Calculate tip and split the bill

🔢Math

Percentage Calculator

Find percentages, increases & decreases

Scientific Calculator

Trig, logs, powers & full scientific functions

Statistics Calculator

Mean, median, std dev, quartiles & more

GPA Calculator

Semester & cumulative GPA on 4.0 scale

⚡Physics & Science

Speed / Distance / Time

Calculate any from the other two

Ohm's Law

Voltage, current, resistance & power

Density Calculator

Calculate density, mass, or volume

Unit Converter

Convert 10 categories of measurements

💪Health & Fitness

BMI Calculator

Body Mass Index with health categories

Calorie Calculator

Daily calorie needs (TDEE) based on goals

📅Date & Time

Age Calculator

Exact age, zodiac, birthday countdown

Date Calculator

Days between dates, add/subtract days

🤖AI Tools

Plant Identifier

Upload a photo, AI identifies the plant

Contract Analyzer

Upload a contract, get plain-English summary

Receipt Scanner

Upload a receipt, extract all data instantly

Background Remover

Remove backgrounds from any photo

Image Upscaler

Enhance and upscale images with AI

Photo Restorer

Restore old and damaged photos

Vocal Remover

Separate vocals from music — karaoke maker

Object Remover

Remove unwanted objects from photos

Video BG Remover

Remove backgrounds from videos

📐Math & Science

∇ Nabla

Graphing, equations, matrices — all-in-one math workspace

100% FreeNo Sign-up RequiredPrivacy-First (Client-Side)400+ Tools Available

How to Use

1Browse the categories below to find the calculator or tool you need.
2Click on any tool card to open it and start using it immediately.
3All tools are free, require no sign-up, and work directly in your browser.

Frequently Asked Questions

Are these calculators free to use?

Yes, all calculators and tools on Alleex are completely free to use with no sign-up or registration required.

Do I need to install anything?

No installation is needed. All tools run directly in your web browser on any device — desktop, tablet, or mobile.

Are my calculations saved or shared?

All calculations are performed locally in your browser. No data is sent to any server, and your inputs are not saved or shared.

Can I use these tools on my phone?

Yes, all tools are fully responsive and optimized for mobile, tablet, and desktop screens.

How many tools are available?

Alleex offers 19+ free tools covering financial calculators, math and science calculators, health calculators, date tools, and AI-powered utilities.

Explore 400+ Free Online Tools

PDF Tools (30+)Image Tools (25+)Video Tools (20+)Audio Tools (15+)Calculators (50+)Unit Converters Text Tools (20+)Developer Tools