# Stax Tools > Stax Tools is a free, privacy-first online toolkit with 199 utilities for developers, designers, finance professionals, students, engineers, and content creators. Every tool runs entirely in your browser — your data is never uploaded, logged, or stored on any server. ## Why Stax - **100% client-side**: All processing happens locally in your browser using JavaScript and Web APIs. No backend touches your input. - **Free with no account**: No signup, no email, no login. Bookmark and use forever. - **No tracking of inputs**: GA4 and Microsoft Clarity record anonymous usage stats only — never the contents of your forms, files, or text. - **Five languages**: English, Hindi, Spanish, French, Arabic. Per-tool localized FAQ and SEO content. - **Open output formats**: All tools export in standard formats (JSON, CSV, PDF, PNG, SVG, etc.) — no proprietary lock-in. ## Tool Catalog ### Developer Tools (55) *JSON, regex, encoding, hashing, color, CSS, and more* - [Aspect Ratio Calculator](https://stax.tools/aspect-ratio-calculator): Calculate, simplify, and scale aspect ratios for video, photo, and design. - [Barcode Generator](https://stax.tools/barcode-generator): Generate barcodes online — CODE128, EAN-13, EAN-8, UPC, CODE39, ITF-14, and more. Customise colors, size, and download as SVG. - [Base64 Encoder / Decoder](https://stax.tools/base64-encoder): Encode text to Base64 or decode Base64 back to plain text. Supports Unicode. - [Binary Text Converter](https://stax.tools/binary-text-converter): Convert text to binary, hex, or octal — and decode back to text. - [Chmod Calculator](https://stax.tools/chmod-calculator): Calculate Unix/Linux file permissions visually. Get octal value and ready-to-run chmod command for any permission set. - [Color Contrast Checker](https://stax.tools/color-contrast-checker): Check WCAG AA and AAA colour contrast ratios for web accessibility compliance. - [Color Palette Generator](https://stax.tools/color-palette-generator): Generate 10 lightness shades and 10 harmonic colours (complementary, triadic, analogous) from any hex colour. - [Color Picker](https://stax.tools/color-picker): Pick any color and instantly get HEX, RGB, and HSL values. - [Cron Expression Parser](https://stax.tools/cron-expression-parser): Parse cron expressions into plain English and preview the next 5 execution times. - [CSS Box Shadow Generator](https://stax.tools/css-box-shadow-generator): Generate CSS box-shadow visually with live preview. Control X/Y offset, blur, spread, color, opacity, and inset. Supports multiple layers. - [CSS Flexbox Playground](https://stax.tools/css-flexbox-playground): Experiment with Flexbox properties visually — flex-direction, justify-content, align-items, flex-wrap, align-content, and gap. Copy the generated CSS. - [CSS Gradient Generator](https://stax.tools/css-gradient-generator): Build linear and radial CSS gradients visually and copy ready-to-use CSS. - [CSS Grid Generator](https://stax.tools/css-grid-generator): Build CSS Grid layouts visually with live preview. Set columns, rows, gap, and alignment. Copy the generated grid CSS instantly. - [CSV to JSON Converter](https://stax.tools/csv-to-json): Convert CSV data to JSON array instantly. Supports all delimiters and quoted fields. - [Date Difference Calculator](https://stax.tools/date-difference-calculator): Calculate exact days, weeks, months, years, and working days between any two dates. Shows countdown for future dates. - [Diff Checker](https://stax.tools/diff-checker): Compare two texts line by line and see exactly what changed. LCS-based diff. - [Email Validator](https://stax.tools/email-validator): Validate email addresses with a 9-point checklist, quality score, and disposable domain detection. Bulk validation supported. - [Favicon Generator](https://stax.tools/favicon-generator): Generate favicons in all sizes (16 to 512px) from text or an uploaded image. Download PNGs and copy the HTML link tag snippet. - [Font Size Converter](https://stax.tools/font-size-converter): Convert CSS font sizes between px, rem, em, pt, vw, vh, and % with custom viewport settings. - [Hash Generator](https://stax.tools/hash-generator): Generate SHA-1, SHA-256, SHA-384, and SHA-512 hashes instantly. - [HEX to RGB Converter](https://stax.tools/hex-rgb-converter): Convert colour codes between HEX, RGB, RGBA, HSL, HSLA, and HSV instantly with live sliders. Click to copy any format. - [HTML Entity Encoder / Decoder](https://stax.tools/html-entity-encoder): Encode HTML special characters to entities or decode HTML entities to plain text. - [HTML Formatter & Beautifier](https://stax.tools/html-formatter): Format, beautify, and minify HTML instantly in your browser. Indent HTML with 2 or 4 spaces with tag stats. 100% client-side. - [Image to Base64 Converter](https://stax.tools/image-to-base64): Convert any image to Base64 or Data URI instantly in your browser. 100% private. - [IP Subnet Calculator](https://stax.tools/ip-subnet-calculator): Calculate IPv4 subnet details from CIDR notation — network address, broadcast, usable hosts, subnet mask, wildcard mask, and IP class. - [JSON ↔ YAML ↔ TOML Converter](https://stax.tools/json-yaml-toml-converter): Convert between JSON, YAML, and TOML data formats instantly in your browser. Swap input and output formats with one click. 100% client-side. - [JSON Formatter](https://stax.tools/json-formatter): Format, beautify, minify, and validate JSON in your browser - [JSON to CSV Converter](https://stax.tools/json-to-csv): Convert JSON arrays to CSV with RFC 4180 quoting. Download or copy instantly. - [JSON to TypeScript Generator](https://stax.tools/json-to-typescript): Convert JSON objects to TypeScript interfaces instantly. Supports nested objects, arrays, union types, and custom root names. - [JSON Tree Viewer](https://stax.tools/json-tree-viewer): Visualise JSON as an interactive collapsible tree. Colour-coded data types, expandable nodes for nested objects and arrays. - [JWT Decoder](https://stax.tools/jwt-decoder): Decode JWT tokens and inspect header, payload, and expiry. Runs in-browser. - [Morse Code Translator](https://stax.tools/morse-code-translator): Translate text to Morse code or decode Morse back to text. Includes full reference chart. - [Number Base Converter](https://stax.tools/number-base-converter): Convert numbers between binary, octal, decimal, and hexadecimal instantly. - [Number Formatter](https://stax.tools/number-formatter): Format numbers for any locale — Indian lakh/crore, US, European, Arabic. Supports currency, percent, scientific, and compact notation. - [Number to Words Converter](https://stax.tools/number-to-words): Convert numbers to words in Indian (Lakh/Crore) or International format. Cheque-ready output. - [Online Stopwatch](https://stax.tools/stopwatch): Free online stopwatch with lap timer. Records fastest and slowest laps with centisecond precision. Works in-browser. - [Password Generator](https://stax.tools/password-generator): Generate strong, random passwords with custom length and character sets. - [Password Strength Checker](https://stax.tools/password-strength-checker): Check password strength with real-time score, crack time estimate, and improvement tips. - [QR Code Generator](https://stax.tools/qr-code-generator): Generate QR codes for URLs, text, Wi-Fi, and more. Download as PNG. - [Random Color Generator](https://stax.tools/random-color-generator): Generate random colour palettes in random, pastel, vivid, dark, or monochrome styles. Lock colours and copy hex codes. - [Random Number Generator](https://stax.tools/random-number-generator): Generate secure random numbers in any range. Bulk generate up to 1000 at once. - [Regex Tester](https://stax.tools/regex-tester): Test regular expressions with live match highlighting and capture groups. - [Roman Numeral Converter](https://stax.tools/roman-numeral-converter): Convert numbers to Roman numerals or decode Roman numerals to numbers. Supports 1–3999 with full reference chart. - [Scientific Calculator](https://stax.tools/scientific-calculator): Free online scientific calculator with trigonometry, logarithms, powers, factorials, and constants π and e. - [SQL Formatter & Beautifier](https://stax.tools/sql-formatter): Format, beautify, and minify SQL queries online. Keyword capitalisation, consistent indentation, and one-click copy. 100% client-side. - [SVG to PNG Converter](https://stax.tools/svg-to-png): Convert SVG to PNG online. Paste SVG code or upload a file, choose scale (1×–4×) and background, and download a high-resolution PNG. - [Text Case Converter](https://stax.tools/text-case-converter): Convert text to camelCase, PascalCase, snake_case, kebab-case, and more. - [Text to Slug Generator](https://stax.tools/text-to-slug): Convert any title or text into a clean, SEO-friendly URL slug. - [Time Zone Converter](https://stax.tools/time-zone-converter): Convert time between IST, UTC, EST, PST, Dubai, Singapore, Tokyo and more. - [Timestamp Converter](https://stax.tools/timestamp-converter): Convert Unix timestamps to dates and vice versa. Supports seconds and milliseconds. - [Unicode Converter](https://stax.tools/unicode-converter): Convert text to Unicode code points and back. Inspect UTF-8/UTF-16 bytes and generate JS, CSS, HTML, and Python escape sequences. - [Unit Converter](https://stax.tools/unit-converter): Convert length, weight, temperature, area, volume, speed, and data units. - [URL Encoder / Decoder](https://stax.tools/url-encoder): Encode or decode URLs and query strings with percent-encoding. - [UUID Generator](https://stax.tools/uuid-generator): Generate cryptographically secure UUID v4 values. Bulk generate up to 50 at once. - [XML Formatter & Validator](https://stax.tools/xml-formatter): Format, beautify, minify, and validate XML in your browser. Supports RSS, SOAP, SVG, config files. 100% client-side. ### Finance Calculators (33) *EMI, SIP, tax, salary, GST, PPF, NPS, and more* - [Bill Splitter](https://stax.tools/bill-splitter): Split restaurant bills equally with tip calculation and per-person amount. - [Brokerage Calculator](https://stax.tools/brokerage-calculator): Calculate stock brokerage, STT, exchange charges, SEBI fees, GST, stamp duty, and net P&L for equity delivery, intraday, and F&O trades. - [CAGR Calculator](https://stax.tools/cagr-calculator): Calculate Compound Annual Growth Rate or find future value and years required. - [Compound Interest Calculator](https://stax.tools/compound-interest-calculator): Calculate compound interest, final amount, APY, and year-by-year growth. - [Credit Card Payoff Calculator](https://stax.tools/credit-card-payoff-calculator): Calculate how long to pay off credit card debt and see how much extra monthly payments save in interest. - [Discount Calculator](https://stax.tools/discount-calculator): Find discounted price and savings amount. Reverse mode finds original MRP from sale price. - [EMI Calculator](https://stax.tools/emi-calculator): Calculate monthly EMI, total interest, and full amortization schedule. - [EMI Comparison Calculator](https://stax.tools/emi-comparison-calculator): Compare two loans side by side — see which gives lower EMI, total interest, and total repayment. - [FD Calculator](https://stax.tools/fd-calculator): Calculate Fixed Deposit maturity amount, interest earned, and effective yield. - [Fuel Cost Calculator](https://stax.tools/fuel-cost-calculator): Calculate trip fuel cost from distance, efficiency (km/L, L/100km, MPG), and price. Supports one-way, return, and passenger split. - [Gratuity Calculator](https://stax.tools/gratuity-calculator): Calculate gratuity as per Payment of Gratuity Act 1972 with eligibility check. - [GST / Sales Tax Calculator](https://stax.tools/sales-tax-calculator): Add or remove GST from any price. Supports CGST/SGST breakdown and includes an HSN rate quick-reference for India. - [GST Calculator](https://stax.tools/gst-calculator): Add or remove GST from any amount. Supports all Indian GST slabs with CGST/SGST split. - [HRA Calculator](https://stax.tools/hra-calculator): Calculate HRA tax exemption for metro and non-metro cities with all three conditions. - [Income Tax Calculator](https://stax.tools/income-tax-calculator): Calculate India income tax for FY 2025-26 under New or Old Regime with slab breakdown. - [Inflation Calculator](https://stax.tools/inflation-calculator): Calculate how inflation erodes purchasing power over time with a year-by-year breakdown. - [Loan Eligibility Calculator](https://stax.tools/loan-eligibility-calculator): Calculate maximum loan eligibility for home, personal, car, and education loans based on income, existing EMIs, and FOIR norms. - [Loan Prepayment Calculator](https://stax.tools/loan-prepayment-calculator): Calculate interest saved and months reduced by prepaying your home loan. Compare reducing EMI vs reducing tenure. - [Loan to Value Calculator](https://stax.tools/loan-to-value-calculator): Calculate LTV ratio for home loans and property loans. Check RBI limits and find max loan amount or required down payment. - [Monthly Budget Planner](https://stax.tools/budget-planner): Plan monthly income and expenses with 50/30/20 rule analysis, savings rate, and category-wise budget breakdown. - [Net Worth Calculator](https://stax.tools/net-worth-calculator): Calculate net worth from assets and liabilities with debt-to-asset ratio. - [NPS Calculator](https://stax.tools/nps-calculator): Calculate NPS corpus, 60% lump sum, and estimated monthly pension at retirement. - [Percentage Calculator](https://stax.tools/percentage-calculator): Find X% of Y, percentage change, and increase/decrease by percentage. - [Percentage Change Calculator](https://stax.tools/percentage-change-calculator): Calculate percentage change, percentage of a value, find original value from a percentage, and percentage difference. - [PPF Calculator](https://stax.tools/ppf-calculator): Calculate PPF maturity amount and year-by-year balance at 7.1% with EEE tax benefit. - [Profit Margin Calculator](https://stax.tools/profit-margin-calculator): Calculate gross profit margin, net profit margin, and markup percentage. Find the revenue needed to hit a target margin. - [Retirement Calculator](https://stax.tools/retirement-calculator): Calculate the corpus needed to retire and the monthly savings required to get there. - [ROI Calculator](https://stax.tools/roi-calculator): Calculate Return on Investment percentage and annualised CAGR for any investment. - [Simple Interest Calculator](https://stax.tools/simple-interest-calculator): Calculate simple interest and total amount using the SI = PRT/100 formula. - [SIP Calculator](https://stax.tools/sip-calculator): Calculate SIP returns, total value, and wealth ratio for mutual funds. - [Take Home Salary Calculator](https://stax.tools/take-home-salary-calculator): Calculate monthly in-hand salary from CTC with PF, tax, and deduction breakdown. - [Tip Calculator](https://stax.tools/tip-calculator): Calculate tip amount and split the total bill equally among any number of people. - [Unit Price Calculator](https://stax.tools/unit-price-calculator): Compare products by unit price to find the best value for money. Supports g, kg, ml, L, oz, lb with automatic unit normalisation. ### AI Writing (7) *Humanize, paraphrase, detect, summarize, generate* - [Bio Generator](https://stax.tools/bio-generator): Generate a professional, casual, creative, or Twitter/X bio. Fill in your name, role, and achievements — copy your bio in seconds. - [Blog Title Generator](https://stax.tools/blog-title-generator): Generate 30 catchy blog title ideas from any topic — how-to, listicle, question, ultimate guide, and power-title formats. Free, instant, no sign-up. - [Caption Generator](https://stax.tools/caption-generator): Generate social media captions for Instagram, LinkedIn, Twitter, Facebook, and TikTok. Pick tone and platform — get 3 captions with hook, body, CTA, and hashtags. - [Email Subject Line Generator](https://stax.tools/email-subject-line-generator): Generate 10 email subject lines for any goal — newsletter, sales, announcement, re-engagement, event, or welcome. Character count and spam-word detection included. - [Essay Outline Builder](https://stax.tools/essay-outline-builder): Build a structured essay outline with intro, body paragraphs, and conclusion. Add sub-points and export as plain text. - [Passive Voice Detector](https://stax.tools/passive-voice-detector): Detect passive voice constructions in any text. Highlights passive sentences and shows your passive voice percentage. - [Writing Prompt Generator](https://stax.tools/writing-prompt-generator): Get creative writing prompts for fiction, horror, romance, sci-fi, mystery, fantasy, personal essays, and non-fiction. 80+ handcrafted prompts. ### Social Media (6) *Instagram fonts, hashtag generators, image resizer* - [Instagram Font Generator](https://stax.tools/instagram-font-generator): Generate stylish Unicode fonts for Instagram bios, captions, and stories. - [Instagram Hashtag Generator](https://stax.tools/instagram-hashtag-generator): Generate Instagram hashtags by niche — Photography, Fitness, Food, Travel, Business, Fashion, Beauty, Tech, India, and more. Pick up to 30. - [LinkedIn Post Formatter](https://stax.tools/linkedin-post-formatter): Write and preview LinkedIn posts with live 'see more' truncation preview. Includes thought leadership and listicle templates. - [Social Media Image Resizer](https://stax.tools/social-media-image-resizer): Resize images to correct dimensions for Instagram, Facebook, Twitter/X, LinkedIn, YouTube, and WhatsApp. Cover, contain, or fill fit modes. - [TikTok Hashtag Generator](https://stax.tools/tiktok-hashtag-generator): Generate trending TikTok hashtags by niche — Dance, Comedy, Food, Fitness, Gaming, Education, and more. Always includes #fyp. - [Twitter / X Thread Formatter](https://stax.tools/twitter-thread-formatter): Format Twitter/X threads with auto tweet splitting, 280-character limit checks, numbering, and one-click copy per tweet. ### WhatsApp (4) *Link generator, QR code, message formatter* - [WhatsApp Button Generator](https://stax.tools/whatsapp-button-generator): Create a 'Chat on WhatsApp' HTML button for your website. Customise style, size, color, and pre-filled message. Copy HTML or wa.me link. - [WhatsApp Link Generator](https://stax.tools/whatsapp-link-generator): Generate a click-to-chat WhatsApp link with pre-filled message and QR code. - [WhatsApp Message Formatter](https://stax.tools/whatsapp-message-formatter): Format WhatsApp messages with bold, italic, strikethrough, and monospace. Live chat preview with business message templates. - [WhatsApp QR Code Generator](https://stax.tools/whatsapp-qr-code): Generate a WhatsApp QR code for any phone number with an optional pre-filled message. Download as PNG for printing. ### PDF Tools (8) *Compress, merge, convert PDF to/from Word, images* - [Image to PDF](https://stax.tools/image-to-pdf): Convert JPG, PNG, and WebP images to a PDF. Multi-page support, page size selection (A4/A3/Letter/fit), and image fit modes. - [PDF Compressor](https://stax.tools/pdf-compressor): Reduce PDF file size using lossless object-stream compression and metadata stripping. No quality loss. - [PDF Merger](https://stax.tools/pdf-merger): Combine multiple PDF files into one document. Upload, reorder, and download the merged PDF. 100% client-side. - [PDF Page Info](https://stax.tools/pdf-page-info): Inspect PDF metadata (title, author, creator), page count, and individual page dimensions in pt and mm. - [PDF Page Numbers](https://stax.tools/pdf-page-numbers): Add page numbers to PDF files. Choose position, format (Page 1 of 10, 1/10), font size, and starting number. Skip cover page option. - [PDF Page Rotator](https://stax.tools/pdf-rotate): Rotate all or specific pages in a PDF by 90°, 180°, or 270°. Fix scanned documents with incorrect orientation. - [PDF Splitter](https://stax.tools/pdf-splitter): Split a PDF by page ranges, every N pages, or extract specific pages. Each part downloads as a separate file. - [PDF Watermark](https://stax.tools/pdf-watermark): Add a text watermark to every page of a PDF. Customise position, angle, font size, color, and opacity. ### Image Tools (7) *Resize, compress, convert formats, all in-browser* - [Image Color Picker](https://stax.tools/image-color-picker): Pick any color from an image and get HEX, RGB, and HSL values. Automatically extracts the dominant color palette from any photo. - [Image Compressor](https://stax.tools/image-compressor): Compress JPEG, PNG, and WebP images with a quality slider. See before/after file size savings. No upload — all in-browser. - [Image Cropper](https://stax.tools/image-cropper): Crop images to any size or aspect ratio. Presets for Instagram, Stories, 16:9, 4:3 and more. Rule-of-thirds grid overlay. - [Image Format Converter](https://stax.tools/image-format-converter): Batch convert images between JPEG, PNG, and WebP. Upload multiple files, set quality, and download all at once. - [Image Resizer](https://stax.tools/image-resizer): Resize images by exact pixels, percentage, or longest side. JPEG, PNG, and WebP output with quality control. 100% client-side. - [Meme Generator](https://stax.tools/meme-generator): Create memes with popular templates or your own image. Add top/bottom text in Impact font with customizable size, color, and stroke. - [Photo Watermark](https://stax.tools/photo-watermark): Add text watermarks to photos — position in corners, center, or tile across the image. Control font size, color, and opacity. ### Health (18) *BMI, calorie, and other personal health calculators* - [Age Calculator](https://stax.tools/age-calculator): Calculate exact age in years, months, days with next birthday countdown. - [Blood Pressure Checker](https://stax.tools/blood-pressure-checker): Check blood pressure readings against AHA guidelines. Classify as Normal, Elevated, or Hypertensive and log readings over time. - [BMI Calculator](https://stax.tools/bmi-calculator): Calculate Body Mass Index with metric or imperial units. - [Body Fat Calculator](https://stax.tools/body-fat-calculator): Calculate body fat percentage using the US Navy formula or BMI-based method. Shows lean mass, fat mass, and category. - [BSA Calculator](https://stax.tools/bsa-calculator): Calculate Body Surface Area using Mosteller, Du Bois, Haycock, and Boyd formulas. - [Calorie Calculator](https://stax.tools/calorie-calculator): Calculate BMR, TDEE, and daily calorie needs using the Mifflin-St Jeor equation. - [Calories Burned Calculator](https://stax.tools/calories-burned-calculator): Calculate calories burned using MET values for 40+ activities. Supports metric and imperial with activity comparison. - [Heart Rate Zone Calculator](https://stax.tools/heart-rate-zone-calculator): Calculate 5 heart rate training zones using the Karvonen formula or % of max HR. Includes fat burn, aerobic, and max effort zones. - [Ideal Weight Calculator](https://stax.tools/ideal-weight-calculator): Calculate ideal body weight using Devine, Robinson, Miller, and Hamwi formulas. - [Love Calculator](https://stax.tools/love-calculator): Fun love compatibility calculator. Enter two names and get a compatibility percentage score. Just for entertainment! 💕 - [Macro Calculator](https://stax.tools/macro-calculator): Calculate daily protein, carbs, and fat targets based on your BMR, TDEE, and fitness goal (cut, maintain, or bulk). - [Ovulation Calculator](https://stax.tools/ovulation-calculator): Calculate ovulation date and fertile window from last period and cycle length. Shows cycle calendar and 3-cycle forecast. - [Pace Calculator](https://stax.tools/pace-calculator): Calculate running pace, finish time, or distance. Shows km/mile splits for any race distance. - [Pomodoro Timer](https://stax.tools/pomodoro-timer): Online Pomodoro timer with customisable focus, short break, and long break durations. Tracks sessions and total focus time. - [Pregnancy Due Date Calculator](https://stax.tools/pregnancy-due-date-calculator): Calculate estimated due date from LMP, conception date, or IVF transfer. Shows weeks pregnant, trimester, and milestones. - [Sleep Calculator](https://stax.tools/sleep-calculator): Find ideal bedtime or wake-up time based on 90-minute sleep cycles. - [Waist-to-Hip Ratio Calculator](https://stax.tools/waist-hip-ratio): Calculate WHR and WHtR with cardiovascular risk assessment per WHO guidelines. - [Water Intake Calculator](https://stax.tools/water-intake-calculator): Calculate daily water intake based on body weight, activity level, and climate with a personalised hydration schedule. ### Creator Tools (10) *YouTube thumbnail, earnings calculator, more* - [Character Counter](https://stax.tools/character-counter): Count characters for Twitter, Instagram, LinkedIn, and other platform limits. - [Lorem Ipsum Generator](https://stax.tools/lorem-ipsum-generator): Generate placeholder Lorem Ipsum text by paragraphs, sentences, or words. - [Markdown Editor](https://stax.tools/markdown-editor): Online Markdown editor with live HTML preview. Supports GFM tables and code blocks. - [Readability Checker](https://stax.tools/readability-checker): Check text readability with Flesch Reading Ease, Flesch-Kincaid Grade, Gunning Fog, SMOG, ARI, and Coleman-Liau scores. - [Reading Time Calculator](https://stax.tools/reading-time-calculator): Calculate reading time and speaking time for any text. Shows word count, character count, sentences, and paragraphs. - [Word Counter](https://stax.tools/word-counter): Count words, characters, sentences, paragraphs, and reading time instantly. - [Word Frequency Counter](https://stax.tools/word-frequency-counter): Analyse word frequency in any text with ranked table, frequency bars, stop-word filter, and CSV export. - [YouTube Earnings Calculator](https://stax.tools/youtube-earnings-calculator): Estimate YouTube AdSense earnings by views, niche, and upload frequency. Shows RPM range and monthly projections in USD and INR. - [YouTube Tag Extractor](https://stax.tools/youtube-tag-extractor): Extract tags from any YouTube video by pasting the page source. See what keywords competitors use and copy selected tags for your own videos. - [YouTube Thumbnail Downloader](https://stax.tools/youtube-thumbnail-downloader): Download YouTube video thumbnails in all sizes — Max Resolution, HD, SD, and default. Paste any YouTube URL or video ID. ### Career & Business (7) *Resume builder, invoice generator, email signatures* - [Cover Letter Generator](https://stax.tools/cover-letter-generator): Generate a professional cover letter in seconds. Fill in your name, role, skills, and achievement — choose professional, confident, or enthusiastic tone. - [Email Signature Generator](https://stax.tools/email-signature-generator): Create a professional HTML email signature with name, title, contact info, and social links. Copy as rich text for Gmail, Outlook, and Apple Mail. - [Freelance Rate Calculator](https://stax.tools/freelance-rate-calculator): Calculate your minimum viable freelance hourly rate from desired take-home income, tax rate, overhead, and billable hours. Derives project and retainer rates. - [GPA Calculator](https://stax.tools/gpa-calculator): Calculate semester GPA and cumulative CGPA on 4.0 or 10.0 scale. Add courses with credits and grades for instant weighted GPA. - [Invoice Generator](https://stax.tools/invoice-generator): Create professional invoices free online with line items, GST/tax, discount, and print-to-PDF. No sign-up needed. - [Meeting Cost Calculator](https://stax.tools/meeting-cost-calculator): Calculate the real cost of any meeting. Add attendees with salaries, set duration and frequency, and see total cost per meeting and annual burn. - [Resume Builder](https://stax.tools/resume-builder): Build a professional resume with experience, education, and skills. Live preview and download as PDF via your browser's print function. Free, no sign-up. ### SEO & Marketing (6) *UTM builder, schema markup, meta preview, robots.txt, sitemap* - [Keyword Density Checker](https://stax.tools/keyword-density-checker): Analyse keyword frequency and density for any text. Check target keyword density, view top 30 words, and avoid SEO over-optimisation. - [Meta Tag Preview](https://stax.tools/meta-tag-preview): Preview how your page looks in Google Search, Twitter/X cards, and Facebook shares. Generate the complete HTML meta tag snippet instantly. - [robots.txt Generator](https://stax.tools/robots-txt-generator): Generate a robots.txt file. Block AI training bots (GPTBot, CCBot), disallow private paths, set crawl delay, and add your sitemap URL. - [Schema Markup Generator](https://stax.tools/schema-markup-generator): Generate JSON-LD schema markup for Article, Product, FAQ, LocalBusiness, Person, Event, Recipe, and HowTo. Copy the