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Build Smarter with Free Online Tools & Resources for Developers
AI, SEO, PDF, image, code and business tools — all in one place
Recently Added Tools
Fast, Browser-First & 100% Accessible
Instant, secure online utilities with zero friction and privacy-first processing.
400+
Free Tools
18
Tools with Paywalls
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Fast
Browser-First
STEP 01
Discover 400+ Tools
Search or browse by category — from AI generators and SEO audit utilities to PDF converters, code formatters, and financial calculators.
STEP 02
Instant In-Browser Execution
No forced signups, paywalls, or app downloads. Your data stays private with client-side, browser-first processing.
STEP 03
Export & Implement Results
Copy generated code, download processed files, or verify official CEFR certificates instantly with zero friction.
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AI Tools
AI-powered productivity for builders.
Calculators
Finance, math and everyday calculators.
Yards to Tons Calculator
Cubic yards ↔ US short tons for gravel, sand, soil.
Hypothèque Suisse
Calculatrice immobilière suisse (Tenabilité).
Gratuity Calculator
UAE end-of-service gratuity calculation (2026).
RERA Calculator
Dubai rent increase calculator and RERA rules.
Mortgage Calculator
Monthly mortgage payments with taxes and insurance.
BMI Calculator
Body Mass Index and weight category.
Decimal to Fraction
How to convert decimal to fraction and back.
Formal Charge
How to calculate formal charge of an atom.
Percentage Calculator
Percentage increase, decrease and difference.
Compound Interest
Compound interest with monthly contributions.
Square Root Curve
Calculate adjusted test scores using the root curve.
Root Calculator
Calculate square roots, cube roots, nth roots and powers.
Age Calculator
Calculate your exact age in years, months and days.
MEq to mL Calculator
Convert Milliequivalents to Milliliters easily.
Rectangle Calculator
Area, perimeter, and diagonal calculator.
Prime Number Calculator
Check if a number is prime or composite.
Factor Calculator
Find all factors of any number.
Developer Tools
Practical utilities for everyday coding tasks.
JSON Formatter
Beautify, minify and validate JSON data.
Base64 Encoder
Encode and decode data to Base64 format.
Bijoy Unicode Converter
Convert Bijoy to Unicode and Unicode to Bijoy.
Regex Tester
Test and debug regular expressions live.
UUID Generator
Generate v1, v4 and bulk UUIDs.
JWT Decoder
Decode and inspect JWT tokens safely.
Hash Generator
MD5, SHA-1, SHA-256 and SHA-512 hashes.
Markdown to HTML
Convert Markdown to clean, valid HTML.
CSV to JSON
Instantly convert CSV data to JSON.
Crontab Generator
Build and explain cron expressions.
SEO Tools
Improve rankings, fix issues and audit pages.
On-Page SEO Checker
Free on-page SEO audit with key metrics.
Meta Description Generator
AI-generated SEO meta descriptions.
Broken Link Checker
Find and fix 404s and broken redirects.
SSL/TLS Certificate Checker
Inspect SSL certificate validity and chain.
Domain Age Checker
Check the age and history of any domain.
Google SERP Simulator
Pixel-perfect SERP preview for titles.
Slug Generator
Clean, SEO-friendly URL slugs.
Open Graph Checker
Preview and validate Open Graph tags.
Structured Data Checker
Validate schema markup and JSON-LD.
Image Tools
Optimize, convert and edit images in your browser.
400×400 Black Image
Solid black PNG placeholders—400×400 and more sizes.
Compress Image
Compress JPG, PNG and WebP without losing quality.
WebP Converter
Convert images to fast-loading WebP format.
CMYK to Pantone
Convert CMYK to Pantone and Pantone to CMYK.
PNG Optimizer
Lossless PNG optimization for the web.
Remove PNG Chroma Key
Remove green screen or solid backgrounds.
PNG Color Replacer
Replace specific colors inside PNG images.
Flip Image
Flip images horizontally or vertically.
Grayscale Image
Convert images to clean grayscale.
Invert Image Colors
Invert image colors for negatives or effects.
Lighten Image
Brighten dark images instantly.
PDF Tools
Edit, compress and convert PDF documents.
Compress PDF
Reduce PDF file size without losing quality.
Merge PDF Files
Combine multiple PDFs into one document.
PDF to JPG
Convert PDF pages to JPG images.
PDF Splitter
Split a PDF into multiple files or extract pages.
PDF to Markdown
Convert PDF documents into clean Markdown.
Markdown to PDF
Generate clean PDF files from Markdown.
Finance Tools
Money calculators for personal and business finance.
VAT Calculator
Calculate VAT inclusive and exclusive prices.
Salary to Hourly
Convert annual salary to hourly rate.
50/30/20 Budget Calculator
Plan your budget using the 50/30/20 rule.
Auto Loan Early Payoff
Project savings from paying off your auto loan early.
FICO Score Estimator
Estimate your FICO score for free.
SaaS LTV Calculator
Compute customer lifetime value for SaaS.
Severance Pay Calculator
Estimate severance pay by tenure and salary.
Crypto Self-Custody Risk
Audit your crypto self-custody risk profile.
CSV to OFX Converter
Convert bank CSVs to OFX for accounting.
Education & Quizzes
Tests, language quizzes and learning utilities.
Typing Speed Test
Measure your typing speed and accuracy.
WCPM Calculator
Calculate Words Correct Per Minute for reading.
Code Typing Test
Test your typing speed with real code.
Developer Typing Test
Typing test with code syntax for developers.
English Assessment Test
Check your English language proficiency.
Spanish Assessment Test
Test your Spanish language level.
Hebrew Assessment Test
Modern Hebrew proficiency & PDF certificate.
Hebrew Numbers
Convert numbers to Hebrew and Hebrew to numbers.
French Assessment Test
Evaluate your French proficiency.
German Assessment Test
Test your German language level.
Korean Proficiency (TOPIK)
Korean proficiency self-check.
Turkish Assessment Test
Test your Turkish language level.
Czech Assessment Test
Test your Czech language level (CEFR A1–C2).
IELTS Band Score
Calculate your IELTS overall band score.
Utilities
Everyday helpers for productivity and the web.
QR Code Generator
Create custom QR codes for URLs and text.
Quarts to Pounds
Convert quarts to pounds based on density.
Password Generator
Generate strong, secure passwords.
Color Converter
Convert HEX, RGB, HSL and pick colors.
What Is My IP Address?
Check your public IP address instantly.
Favicon Generator
Generate favicons in all modern sizes.
SVG to Favicon
Convert SVG files to favicon packages.
Excel to HTML Converter
Convert Excel sheets to clean HTML tables.
Privacy Policy Generator
Generate a privacy policy for your site.
Country Flag Downloader
Download country flags in multiple sizes.
Stopwatch & Timer
Stopwatch with laps and countdown timer.
Screen Recorder
Record your screen directly in the browser.
EXIF Data Viewer
Read hidden metadata from your photos.
Email Validator
Check email validity, MX records, and more.
Password Strength Checker
Test password security in your browser.
Audio Translator
Record voice and translate to different languages.
QR Code Scanner
Scan QR codes with your camera or image.
Productivity
Stay focused and ship faster.
Printable Paper Generator
Generate custom Dot Grid, Graph, Lined & Music Staff PDFs.
Label Sheets Generator
Print Avery compatible address & shipping label sheets.
Pomodoro Focus Timer
Stay focused with timed work sessions.
Email Signature Generator
Create professional email signatures.
Email Permutator
Generate likely email permutations.
Useless Meeting Cost
Calculate the real cost of meetings.
Job Title Generator
Generate creative job titles.
Word Counter
Count words, characters and reading time.
Entertainment
Quick games, generators and fun utilities.
Wheel of Names
Random name picker & prize wheel with sound effects.
Click Speed Test
Measure your clicks per second (CPS).
BPM Tap Counter
Tap to find beats per minute of any song.
Tetris Game
Play the classic Tetris game online.
Trivia Quiz
Test yourself with general knowledge trivia.
Random Movie Picker
Pick a random movie when you can't decide.
Meme Generator
Create custom memes from popular templates.
Cat Name Generator
Generate cute and creative cat names.
Decision Wheel
Spin the wheel to make random decisions.
Why teams choose Cubbbix
Built for fast execution with practical tools across every workflow.
100% Free
No premium tiers, no usage caps, no surprise paywalls.
Privacy First
Many tools run directly in your browser with minimal data exposure.
Fast Execution
Lean interface for entrepreneurs, operators, and builders.
Loved by Builders
Support Cubbbix on Product Hunt
If Cubbbix helps your workflow, your upvote helps us keep building premium-quality tools that remain free.
Why Cubbbix is trusted for free online utilities
Cubbbix offers free online tools and calculators designed for entrepreneurs, managers, creators, developers and SEO teams. From productivity and finance calculators to PDF, image, social media and developer utilities, each tool is built with a minimal interface, fast performance and privacy-first behavior. No subscriptions, no forced sign-up and no unnecessary complexity.
Frequently Asked Questions
Quick answers about using Cubbbix tools.
Are Cubbbix tools really free?
Yes. Every tool on Cubbbix is 100% free to use. There are no premium tiers, no usage caps, and no surprise paywalls. We build the same kind of tools other platforms charge subscriptions for.
Do I need to create an account to use the tools?
No account is required for any tool on Cubbbix. You can use every utility instantly without signup, email verification, or login.
Is my data safe when I use Cubbbix tools?
Most tools run directly in your browser, so your input never leaves your device. Where server processing is required (for example PDF compression), we process and discard data immediately and do not store user files.
Can I use Cubbbix tools for commercial work?
Yes. You can freely use Cubbbix tools for personal, business, and commercial projects without restrictions.
How can I suggest a new tool for Cubbbix?
We love tool suggestions. Reach the Cubbbix team via the contact page and propose any new utility you would like to see added.
How do you earn while keeping Cubbbix tools free?
Cubbbix earns through Google Ads on tool pages and optional support from the Buy Me a Pizza button. That support helps us keep tools free and continue improving the platform.
Are the language proficiency certificates official and verifiable?
Yes! Our CEFR language tests (French, German, Spanish, etc.) generate official certificates complete with a unique verifiable QR code, score breakdown, and tamper-proof verification ID that you can share on LinkedIn, resumes, or portfolios.
Are there any file size or daily usage limits?
No artificial limits or throttling are imposed. You can convert, analyze, calculate, and process files as often as you need throughout the day without waiting in queues or paying fees.
Do Cubbbix tools work on mobile and tablet devices?
Absolutely. Every tool is fully responsive and optimized for smartphones, tablets, laptops, and desktops, allowing you to run utilities smoothly from any device or browser.
