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400+ Free Online Tools & AI Utilities CEFR Language Tests with Verified Certificates
AI, SEO, PDF, image, code and business tools — all in one place
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Instant, secure online utilities with zero friction and privacy-first processing.
400+
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Tools with Paywalls
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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 get verifiable CEFR certificates instantly with zero friction.
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AI Tools
AI-powered productivity for builders.
Calculators
Finance, math and everyday calculators.
Raosoft Sample Size Calculator
Calculate survey sample size using Raosoft formula & margin of error.
Binary Division Calculator
Divide binary numbers with quotient, remainder & step-by-step math.
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 Checker
Check if any number is prime instantly with factor breakdown.
Binary Converter
Convert binary, decimal, hex, two's complement and subnets.
Meters to Feet
Convert meters to feet & inches, calculate height and track marks.
Factor Calculator
Find all factors of any number.
Developer Tools
Practical utilities for everyday coding tasks.
JSON Formatter
Beautify, minify and validate JSON data.
XSD to XML Converter
Convert XSD to XML converter online instances instantly.
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.
Free SEO Audit Tools
Free SEO audit tools free for on-page check, metadata & SEO analysis.
Website Keywords Checker
Check website keyword density, term frequency & metadata.
Bulk URL & Redirect Checker
Audit bulk URL status codes, broken links & 404 redirects.
Meta Description Generator
AI-generated SEO meta descriptions.
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.
Photo Size Compressor
Reduce file size JPG, PNG & WebP without losing quality.
Compress JPG to 40KB
How to reduce file size JPG down to 40KB/50KB for online forms.
Image Size Reducer
Optimize image for web performance & reduce the size of JPG.
400×400 Black Image
Solid black PNG placeholders—400×400 and more sizes.
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.
13th Month Pay Calculator
Philippine DOLE 13th month pay and tax estimator.
Numbers to Words
Convert numbers to words and generate bank check lines.
Chiffre en Lettre [€]
Convertisseur de chiffres en lettres et chèque bancaire.
Crypto Self-Custody Risk
Audit your crypto self-custody risk profile.
CSV to OFX Converter
Convert bank CSVs to OFX for accounting.
Education & Quizzes
Free language tests with optional verified CEFR certificates.
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 Level Test (CEFR A1–C2)
Free English proficiency test with optional verified certificate.
Spanish Level Test (CEFR A1–C2)
Free Spanish proficiency test with optional verified certificate.
Hebrew Assessment Test
Modern Hebrew proficiency & PDF certificate.
Hebrew Numbers
Convert numbers to Hebrew and Hebrew to numbers.
French Level Test (DELF A1–C2)
Free French proficiency test with optional verified certificate.
German Level Test (A1–C2)
Free German Einstufungstest with optional verified certificate.
Korean Proficiency (TOPIK)
Korean proficiency self-check with optional verified certificate.
Turkish Level Test (CEFR A1–C2)
Free Turkish proficiency test with optional verified certificate.
Czech Level Test (CEFR A1–C2)
Free Czech proficiency test with optional verified certificate.
Make a Blooket
Free Blooket quiz creator and CSV spreadsheet generator.
IELTS Band Score
Calculate your IELTS overall band score.
Utilities
Everyday helpers for productivity and the web.
Comma Adder Online
Add comma after each line, insert comma & format CSV text lists.
Clock with Milliseconds
Live digital clock with milliseconds (.000ms), nanosecond timer & stopwatch.
QR Code Generator
Create custom QR codes, QR code contact generator & business links.
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 & Calculator
Count words, characters, wordchecker & reading time.
Online Notepad
Free online notepad to write, edit, and auto-save notes locally.
Entertainment
Quick games, generators and fun utilities.
Magic & Fantasy Spell Generator
Generate fantasy spell, Latin incantation & superpower for RPGs.
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.
Free Tools Forever
All 400+ tools are free with no usage caps. Optional verified language certificates available.
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.
Free Online Tools, Calculators & Web Utilities on Cubbbix
Cubbbix is your all-in-one hub for free online tools, calculators, and digital utilities for creators, developers, digital marketers, and business professionals. Whether you are searching for a high-performance photo size compressor to reduce file size JPG images, a statistical Raosoft sample size calculator, robust free SEO audit tools, or a free CEFR language test with an optional verified certificate, our suite of tools online delivers immediate results directly in your web browser without paywalls or registrations.
Photo Size Compressor & Image Size Reducer
Need an image size reducer to reduce the size of JPG files? Our photo size compressor makes it effortless to reduce file size JPG down to your target dimensions without sacrificing quality. Discover how to reduce file size JPG and how to reduce the size of a jpg to optimize image for web publishing, webforms, and storage. Learn how to reduce file size without losing quality with zero software installation.
Raosoft Sample Size Calculator & Formula
Planning a scientific survey or market research project? Use our Raosoft sample size calculator powered by the official Raosoft formula. Compute statistical margin of error and target sample requirements with the Raosoft calculator, Raosoft sample calculator, Raosoft sampling calculator, and Raosoft calculator app to determine the ideal Raosoft sample size or Raosoft parameters for any population.
Free SEO Audit Tools & Keyword Analysis
Improve search engine performance with free SEO audit tools and seo audit tools free. Perform a complete online website audit, audit header response codes with our bulk URL checker, inspect keyword density using our website keywords checker, and analyze page optimization with our website SEO analysis tool, seo audit tool free, and free SEO optimization tools.
Comma Adder Online, Word Calculator & Text Formatting
Format raw text lists cleanly with our comma adder and comma adder online. Easily add comma, insert comma, add a comma, or add comma after each line. Utilize the comma inserter, comma generator, or free comma tool to prepare SQL IN clauses and CSV files. Track text lengths using our word calculator, word counter (ord counter), wordchecker, and encode text tools.
Clock with Milliseconds & Precision Timers
Measure elapsed time down to sub-second precision with our live clock with milliseconds and digital clock with milliseconds. Track time with milliseconds, run a live millisecond clock, or utilize precision countdowns like the nanosecond timer, nano second timer, 1 nanosecond timer, clock with nanoseconds, and online stop watch.
Developer Utilities & Creative Generators
Build digital workflows using our QR code editor, QR code contact generator, and create QR code for business. Work with code using our binary division calculator, XSD to XML converter online, summarize a story text tool, or random blob generator. Plus, spark creativity with RPG tools like our magic spell generator, fantasy spell generator, incantation generator, and superpower generator on our free online tool platform.
Free CEFR Language Tests & Verified Certificates
Check your level with a free French level test (DELF A1–C2), German Einstufungstest, Spanish level test, English proficiency test, and more. Every assessment maps your score to the CEFR scale from A1 to C2, and you can upgrade to a verifiable language certificate with QR code for LinkedIn, CVs, and university applications.
Frequently Asked Questions
Quick answers about using Cubbbix tools.
Are Cubbbix tools really free?
Yes. All 400+ tools on Cubbbix are 100% free to use — no usage caps, no signup, no surprise paywalls. Optional verified language certificates (CEFR A1–C2 with QR-code verification for LinkedIn and CVs) are available for $9.99.
How does the photo size compressor reduce JPG file size without losing quality?
Our photo size compressor uses smart browser-based compression to reduce file size JPG images while preserving visual clarity. If you need an image size reducer to reduce the size of JPG files or optimize image for web performance, you can reduce file size without losing quality in seconds without uploading data to external servers.
How do I calculate sample size using the Raosoft formula?
The Raosoft sample size calculator applies the standard mathematical Raosoft formula based on margin of error, confidence levels, and population size. Whether you are using our web-based Raosoft calculator or mobile-friendly Raosoft calculator app, you can quickly compute your recommended Raosoft sample size for statistical research.
What features are included in Cubbbix free SEO audit tools?
Cubbbix provides free SEO audit tools and seo audit tools free to help creators and marketers perform an online website audit. Our suite includes a website keywords checker for keyword density, a bulk URL checker for HTTP status inspection, and a website SEO analysis tool for technical on-page auditing.
How do I add a comma after each line using the comma adder online tool?
Our comma adder online utility allows you to paste any list of text or numbers and instantly add comma, insert comma, or add comma after each line. Using our comma inserter and comma generator, you can convert columnar data into comma-separated lists for SQL queries, spreadsheets, and coding applications.
Does the clock with milliseconds display real-time nanoseconds?
Yes. The clock with milliseconds features a live digital clock with milliseconds display updated via
requestAnimationFrame. It also includes an online stop watch and a nanosecond timer to display precision high-resolution timestamps down to fractional milliseconds (.000ms).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, optional verified language certificates, 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 certificates verifiable?
Yes. Our CEFR language tests (French, German, Spanish, English and more) issue verifiable certificates with a unique QR code, score breakdown and tamper-proof verification ID for LinkedIn, resumes and portfolios. They are diagnostic assessments, not government-issued diplomas such as DELF, DALF or JLPT.
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.
