500+ Free Tools • AI Utilities • CEFR Language Tests
Along with CEFR-aligned language tests.
Every tool runs right in your browser. No signup, no installs, and your files stay private.
Free Tools
Free Language Tests
Instant Access
Browser-First
STEP 01
Search or browse by category: AI generators, SEO utilities, PDF converters, code formatters, calculators and more.
STEP 02
No forced signups and no app downloads. Most tools process everything on your own device, so your data stays with you.
STEP 03
Copy the generated code, download the processed file, or get your verifiable CEFR certificate. Done in seconds.
Get the Chrome Extension
Score your text with Flesch Reading Ease, Flesch-Kincaid Grade, Gunning Fog and SMOG, plus word, sentence and syllable counts and your longest sentences.
Find hidden characters in pasted text: zero-width spaces, joiners, BOM, non-breaking spaces, soft hyphens and direction controls, with a cleaned copy.
Find a character by name or code point, copy it with its HTML entity, and inspect pasted characters to see their exact code points.
Make fast checklists that stay private on your device: multiple lists, priorities, due dates, filters, and JSON export and import.
AI-powered productivity for builders.
Finance, math and everyday calculators.
Calculate survey sample size using Raosoft formula & margin of error.
Divide binary numbers with quotient, remainder & step-by-step math.
Cubic yards ↔ US short tons for gravel, sand, soil.
Calculatrice immobilière suisse (Tenabilité).
UAE end-of-service gratuity calculation (2026).
Dubai rent increase calculator and RERA rules.
Monthly mortgage payments with taxes and insurance.
Body Mass Index and weight category.
How to convert decimal to fraction and back.
How to calculate formal charge of an atom.
Percentage increase, decrease and difference.
Compound interest with monthly contributions.
Calculate adjusted test scores using the root curve.
Calculate square roots, cube roots, nth roots and powers.
Calculate your exact age in years, months and days.
Convert Milliequivalents to Milliliters easily.
Area, perimeter, and diagonal calculator.
Check if any number is prime instantly with factor breakdown.
Convert numbers to Roman numerals and back.
Convert binary, decimal, hex, two's complement and subnets.
Convert meters to feet & inches, calculate height and track marks.
Find all factors of any number.
Practical utilities for everyday coding tasks.
Create ard.json / ai-catalog.json catalogs visually: MCP, A2A, skills, URNs and queries.
Validate ARD catalogs against v0.91 rules and score their discovery signals.
Audit any domain for ard.json, legacy paths, link tags and Agentmap. Scored to 100.
Randomize layouts and particle fields with native CSS random() - plus fallback CSS.
Test calc() typed division in your browser and play with live unit math.
Validate calc() expressions: type rules, typed division, spacing traps.
Divide CSS units, watch types cancel, convert with layout context.
Build viewport-to-property CSS formulas visually; copy the calc().
Measure SPA route performance: live demo log plus a copyable instrumentation snippet.
Test back-forward cache restores and audit unload listeners in your code.
Animate between page states: pick an effect, preview live, copy the code.
Position tooltips and popovers with pure CSS anchor positioning.
Check if your screen really shows HDR and wide-gamut color.
Validate WebGPU shaders with the real compiler, line-numbered errors.
Can your browser run AI on your NPU? Probe WebNN CPU, GPU and NPU contexts live.
Check WebGPU support, GPU adapter info, features, limits and a compute benchmark.
Beautify, minify and validate JSON data.
Convert XSD to XML converter online instances instantly.
Encode and decode data to Base64 format.
Convert Bijoy to Unicode and Unicode to Bijoy.
Test and debug regular expressions live.
Generate v1, v4 and bulk UUIDs.
Decode and inspect JWT tokens safely.
MD5, SHA-1, SHA-256 and SHA-512 hashes.
Convert Markdown to clean, valid HTML.
Instantly convert CSV data to JSON.
Build and explain cron expressions.
Improve rankings, fix issues and audit pages.
Score any page to 100 on llms.txt, AI crawler rules and agent-readable structure.
Validate your llms.txt or generate a draft from your sitemap.xml.
Free SEO audit tools free for on-page check, metadata & SEO analysis.
Check website keyword density, term frequency & metadata.
Audit bulk URL status codes, broken links & 404 redirects.
AI-generated SEO meta descriptions.
Inspect SSL certificate validity and chain.
Check the age and history of any domain.
Pixel-perfect SERP preview for titles.
Clean, SEO-friendly URL slugs.
Preview and validate Open Graph tags.
Validate schema markup and JSON-LD.
Optimize, convert and edit images in your browser.
Reduce file size JPG, PNG & WebP without losing quality.
How to reduce file size JPG down to 40KB/50KB for online forms.
Resize an image to exact pixel dimensions online.
Optimize image for web performance & reduce the size of JPG.
Solid black PNG placeholders—400×400 and more sizes.
Convert images to fast-loading WebP format.
Convert CMYK to Pantone and Pantone to CMYK.
Lossless PNG optimization for the web.
Remove green screen or solid backgrounds.
Replace specific colors inside PNG images.
Flip images horizontally or vertically.
Convert images to clean grayscale.
Invert image colors for negatives or effects.
Brighten dark images instantly.
Edit, compress and convert PDF documents.
Reduce PDF file size without losing quality.
Combine multiple PDFs into one document.
Convert PDF pages to JPG images.
Split a PDF into multiple files or extract pages.
Convert PDF documents into clean Markdown.
Generate clean PDF files from Markdown.
Money calculators for personal and business finance.
Calculate VAT inclusive and exclusive prices.
Convert annual salary to hourly rate.
Plan your budget using the 50/30/20 rule.
Project savings from paying off your auto loan early.
Estimate your FICO score for free.
Compute customer lifetime value for SaaS.
Estimate severance pay by tenure and salary.
Philippine DOLE 13th month pay and tax estimator.
Convert numbers to words and generate bank check lines.
Convertisseur de chiffres en lettres et chèque bancaire.
Audit your crypto self-custody risk profile.
Convert bank CSVs to OFX for accounting.
Free language tests with optional verified CEFR certificates.
Measure your typing speed and accuracy.
Calculate Words Correct Per Minute for reading.
Test your typing speed with real code.
Typing test with code syntax for developers.
Free English proficiency test with optional verified certificate.
Free Spanish proficiency test with optional verified certificate.
Modern Hebrew proficiency & PDF certificate.
Convert numbers to Hebrew and Hebrew to numbers.
Free French proficiency test with optional verified certificate.
Free German Einstufungstest with optional verified certificate.
Deutsch-Test A1–C2 auf Deutsch: Niveau pruefen, Zertifikat optional.
Korean proficiency self-check with optional verified certificate.
Free Turkish proficiency test with optional verified certificate.
Free Czech proficiency test with optional verified certificate.
Free Blooket quiz creator and CSV spreadsheet generator.
Calculate your IELTS overall band score.
Everyday helpers for productivity and the web.
Add comma after each line, insert comma & format CSV text lists.
Live digital clock with milliseconds (.000ms), nanosecond timer & stopwatch.
Test your webcam, microphone and speakers in the browser.
Create custom QR codes, QR code contact generator & business links.
Convert quarts to pounds based on density.
Generate strong, secure passwords.
Convert HEX, RGB, HSL and pick colors.
Check your public IP address instantly.
Generate favicons in all modern sizes.
Convert SVG files to favicon packages.
Convert Excel sheets to clean HTML tables.
Generate a privacy policy for your site.
Download country flags in multiple sizes.
Stopwatch with laps and countdown timer.
Record your screen directly in the browser.
Read hidden metadata from your photos.
Check email validity, MX records, and more.
Test password security in your browser.
Record voice and translate to different languages.
Scan QR codes with your camera or image.
Stay focused and ship faster.
Generate custom Dot Grid, Graph, Lined & Music Staff PDFs.
Print Avery compatible address & shipping label sheets.
Stay focused with timed work sessions.
Create professional email signatures.
Generate likely email permutations.
Calculate the real cost of meetings.
Generate creative job titles.
Count words, characters, wordchecker & reading time.
Free online notepad to write, edit, and auto-save notes locally.
Quick games, generators and fun utilities.
Generate fantasy spell, Latin incantation & superpower for RPGs.
Random name picker & prize wheel with sound effects.
Measure your clicks per second (CPS).
Tap to find beats per minute of any song.
Play the classic Tetris game online.
Test yourself with general knowledge trivia.
Pick a random movie when you can't decide.
Create custom memes from popular templates.
Generate cute and creative cat names.
Spin the wheel to make random decisions.
Built for fast execution with practical tools across every workflow.
All 500+ tools are free with no usage caps. Optional verified language certificates available.
Many tools run directly in your browser with minimal data exposure.
Lean interface for entrepreneurs, operators, and builders.
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.
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.
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.
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.
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.
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.
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.
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.
Quick answers about using Cubbbix tools.
requestAnimationFrame. It also includes an online stop watch and a nanosecond timer to display precision high-resolution timestamps down to fractional milliseconds (.000ms).Full transparent performance metrics for our active & historic sponsor showcase.
Total Impressions
683,225
Verified Clicks
30
Overall CTR
0%
