# OmniTools (https://omnitools.net) > OmniTools is an all-in-one suite of 70+ free, client-side, private, and lightning-fast online tools, financial calculators, text formatters, SEO analyzers, academic helpers, and daily converters. All utilities run privately in the user browser with zero tracking and full offline PWA support. ## Key Facts - Website: https://omnitools.net - Direct Directory: https://omnitools.net/tools - PWA / Offline: Supported, installable on Android, iOS, Windows, Mac - Privacy: All computation runs client-side in Javascript, no user data stored or sent to remote servers - Free: 100% Free with no login or subscription required ## Primary Tool Categories & Directory ### Date, Time & Calendar Utilities - [Age Calculator](https://omnitools.net/tools/age-calculator): Calculate exact age in years, months, days, hours, and find your next birthday. - [Time Zone Converter](https://omnitools.net/tools/time-zone-converter): Convert time across world timezones with live international clock comparisons. - [Lap Day Calculator](https://omnitools.net/tools/lap-day-calculator): Calculate 1,000th / 10,000th day life milestones, leap days, and athletic lap splits. - [Leap Year Calculator](https://omnitools.net/tools/leap-year-calculator): Check if any year is a leap year, explore range lists, upcoming leap days, and astronomical rules. ### Calculators & Math Utilities - [Percentage Calculator](https://omnitools.net/tools/percentage-calculator): Calculate percentages, percentage increase or decrease, and proportions instantly. - [Centripetal Force Calculator](https://omnitools.net/tools/centripetal-force-calculator): Calculate centripetal force, acceleration, and orbital period for circular motion. - [Electron Configuration Calculator](https://omnitools.net/tools/electron-configuration-calculator): Find standard and noble gas electron configurations, orbital diagrams, and valence electrons. - [Linear Independence Calculator](https://omnitools.net/tools/linear-independence-calculator): Test if a set of vectors in R2, R3, or R4 are linearly independent or dependent. - [Simple Calculator](https://omnitools.net/tools/simple-calculator): Clean, fast online calculator with keyboard support, memory functions, and history. - [Tip Calculator](https://omnitools.net/tools/tip-calculator): Calculate tips, total restaurant bill, and split costs evenly among friends. - [Aspect Ratio Calculator](https://omnitools.net/tools/aspect-ratio-calculator): Calculate screen and image aspect ratios (16:9, 4:3, 1:1) and proportional dimensions. - [CCTV & NVR Surveillance Storage Calculator](https://omnitools.net/tools/cctv-storage-calculator): Calculate required hard drive storage (TB/GB) and bandwidth for IP cameras, NVRs, and DVR systems (H.265+, H.264). - [Grow Garden Calculator](https://omnitools.net/tools/grow-garden-calculator): Calculate raised bed plant capacity, soil volume needed (cubic feet/bags), harvest yields, and grocery savings. ### Finance & Investment Calculators - [EMI Calculator](https://omnitools.net/tools/emi-calculator): Calculate Equated Monthly Installments (EMI) for home, car, or personal loans. - [Loan Calculator](https://omnitools.net/tools/loan-calculator): Analyze full loan payments, total cost, interest charges, and payoff timelines. - [SIP Calculator](https://omnitools.net/tools/sip-calculator): Calculate mutual fund returns, wealth compounding, and SIP calculator with inflation adjustment. - [GST Calculator](https://omnitools.net/tools/gst-calculator): Reverse GST calculator online free with standard slab rates (5%, 12%, 18%, 28%) and custom tax calculation. - [Discount Calculator](https://omnitools.net/tools/discount-calculator): Calculate sale prices, final checkout cost, dollar savings, and sales tax. - [MIRR Calculator](https://omnitools.net/tools/mirr-calculator): Calculate Modified Internal Rate of Return (MIRR) with financing and reinvestment rates. - [Compound Interest Calculator](https://omnitools.net/tools/compound-interest-calculator): Calculate future portfolio value with compound interest and monthly deposits. - [Sales Tax Calculator](https://omnitools.net/tools/sales-tax-calculator): Calculate sales tax, total purchase price, or reverse-calculate pre-tax amount. - [PayPal Fee Calculator (Updated 2026)](https://omnitools.net/tools/paypal-fee-calculator): Calculate exact transaction fees and net payouts for PayPal goods, services, and international sales. - [Spotify Revenue Calculator](https://omnitools.net/tools/spotify-revenue-calculator): Calculate estimated music royalties, artist payouts, and compare earnings with Apple Music and Tidal. ### Health & Fitness Calculators - [BMI Calculator](https://omnitools.net/tools/bmi-calculator): Calculate Body Mass Index for adults with Metric and Imperial units. ### SEO & Webmaster Tools - [CPM Calculator](https://omnitools.net/tools/cpm-calculator): Calculate Cost Per Mille (CPM), ad impressions, and campaign advertising budget. - [Meta Tag Generator](https://omnitools.net/tools/meta-tag-generator): Generate Google SEO, Open Graph, and Twitter card meta tags with live preview. - [DA PA Checker (Domain Authority)](https://omnitools.net/tools/da-pa-checker): Check Domain Authority (DA), Page Authority (PA), Spam Score, and backlink metrics for any website. - [Plagiarism Checker](https://omnitools.net/tools/plagiarism-checker): Scan essays, articles, and assignments for duplicate content and sentence-by-sentence plagiarism. - [AI Content Detector](https://omnitools.net/tools/ai-content-detector): Detect text generated by ChatGPT, Gemini, and Claude with perplexity and burstiness analysis. - [Keyword Density Checker](https://omnitools.net/tools/keyword-density-checker): Analyze keyword frequency, single words, 2-word, and 3-word phrase density to prevent stuffing. - [Free Grammar & Spell Checker](https://omnitools.net/tools/grammar-checker): Check and auto-fix spelling, grammar, punctuation, passive voice, and readability issues. - [Small Text Generator](https://omnitools.net/tools/small-text-generator): Convert standard text into tiny unicode fonts, small caps, superscript, and subscript for social bios. - [Invisible Character Generator](https://omnitools.net/tools/invisible-character-generator): Copy invisible blank spaces, zero-width characters (ZWSP), and Hangul filler for names and bios. - [HTTP Header & Status Checker](https://omnitools.net/tools/http-header-checker): Inspect HTTP response codes (200, 301, 404), TTFB response time, and security headers. ### Text Analysis & String Tools - [Word Counter](https://omnitools.net/tools/word-counter): Count words, characters, and Instagram caption word counter with live social limits. - [Character Counter](https://omnitools.net/tools/character-counter): Track character counts with live social media limits for Twitter, Meta, and SMS. - [Case Converter](https://omnitools.net/tools/case-converter): Convert text between UPPERCASE, lowercase, Title Case, camelCase, snake_case, and more. - [Find & Replace Text](https://omnitools.net/tools/find-replace-text): Find and replace text or code with case sensitivity, whole words, regex, and batch rules. - [Lorem Ipsum Generator](https://omnitools.net/tools/lorem-ipsum-generator): Generate placeholder dummy text by paragraphs, sentences, or word counts. - [Fancy Font & Bio Text Generator](https://omnitools.net/tools/fancy-font-generator): Transform plain text into stylish Unicode fonts (Cursive, Bold, Gothic, Blackboard) for Instagram and gaming bios. - [Remove Duplicate Lines & List Cleaner](https://omnitools.net/tools/duplicate-line-remover): Clean messy lists, email databases, and keywords. Eliminate repeated lines with optional A-Z sorting. ### Productivity - [Password Generator](https://omnitools.net/tools/password-generator): Create strong, random, secure passwords with custom length and symbol options. ### Utilities - [QR Code Generator](https://omnitools.net/tools/qr-code-generator): Create custom QR codes for websites, text, and WiFi with PNG and SVG download. - [Random Number Generator](https://omnitools.net/tools/random-number-generator): Generate random numbers, lottery picks, dice rolls, and coin flips. - [Funny Network Names](https://omnitools.net/tools/funny-network-names): 100+ hilarious, clever, and punny WiFi SSID names with built-in instant QR code generator. - [CPS Checker & Click Speed Test](https://omnitools.net/tools/cps-checker): Test your clicking speed in CPS (clicks per second) with Mouse Left-Click, Right-Click, and Mobile Tap modes. ### Developer & Web Tools - [JSON Formatter & CSV Converter](https://omnitools.net/tools/json-formatter): JSON to CSV converter without upload private, plus JSON formatter, beautifier, minifier & validator. - [URL Encoder/Decoder](https://omnitools.net/tools/url-encoder-decoder): Encode or decode strings and query parameters for safe web transmission. - [Add Line Numbers](https://omnitools.net/tools/add-line-numbers): Add line numbers to code, logs, or text with custom delimiters, zero-padding, or strip numbers. - [Base64 Encoder / Decoder](https://omnitools.net/tools/base64-encoder-decoder): Encode text to Base64 or decode Base64 strings with UTF-8 and URL-safe modes. - [URL Slug & Permalink Generator](https://omnitools.net/tools/url-slug-generator): Convert article titles, headlines, and strings into clean, SEO-optimized URL permalink slugs. - [UUID / GUID Generator (Version 4)](https://omnitools.net/tools/uuid-generator): Generate cryptographically secure Version-4 Universally Unique Identifiers (single or bulk batches). ### Unit & Format Converters - [Unit Converter](https://omnitools.net/tools/unit-converter): Convert units across length, weight, temperature, area, volume, speed, and digital data. ### AI & Machine Learning Powered Tools - [AI Text Rewriter](https://omnitools.net/tools/ai-text-rewriter): Rewrite, polish, and paraphrase content to enhance tone, clarity, and readability. - [AI Summarizer](https://omnitools.net/tools/ai-summarizer): Condense long articles, reports, and meeting notes into key bullet takeaways. - [AI Title Generator](https://omnitools.net/tools/ai-title-generator): Generate high-converting headlines, YouTube titles, and blog post titles. - [AI Blog Outline Generator](https://omnitools.net/tools/ai-blog-outline-generator): Create structured, SEO-friendly article outlines with H2 and H3 subheadings. - [Diwali Wishes & AI Prompt Generator](https://omnitools.net/tools/diwali-wishes-ai-prompt-generator): Generate festive Deepawali wishes, WhatsApp status greetings, and Midjourney AI art prompts in Hindi, English, and Hinglish. ### Social Media & Marketing Utilities - [AI Social Caption Generator](https://omnitools.net/tools/ai-social-caption-generator): Draft engaging social media captions with relevant hashtags for Instagram, LinkedIn, and X. - [AI Viral Hook Generator](https://omnitools.net/tools/ai-viral-hook-generator): Create scroll-stopping opening hooks for Reels, TikToks, threads, and newsletters. - [YouTube Subscribe Link Generator](https://omnitools.net/tools/subscribe-link-generator): Generate 1-click YouTube auto-confirmation subscribe links, HTML buttons & QR codes. - [YouTube HD Thumbnail Downloader](https://omnitools.net/tools/youtube-thumbnail-downloader): Download Full HD (1080p, 4K), 720p, and HQ thumbnails from any YouTube video or Shorts link. - [Instagram Reels & Post Caption Tools](https://omnitools.net/tools/instagram-post-tools): Clean caption spacer, high-reach hashtag bundles, and 2,200 character & 30-tag limit calculator. - [WhatsApp Direct Chat Link & QR Generator](https://omnitools.net/tools/whatsapp-link-generator): Generate 1-click 'wa.me' direct chat links and instant scannable QR codes with custom pre-filled messages. ### Education, Science & Academic Tools - [AI Study Assistant](https://omnitools.net/tools/ai-study-assistant): Break down difficult topics, get clear explanations, and practice quiz questions. - [Study Document & Notes Viewer](https://omnitools.net/tools/study-document-viewer): Distraction-free document & study notes reader with eye-care themes, word metrics, and margin notes. - [Academic Citation Generator](https://omnitools.net/tools/citation-generator): Generate accurate academic citations in APA 7th, MLA 9th, Chicago, Harvard, IEEE, and Vancouver formats. - [AI Study Notes & Formula Summarizer](https://omnitools.net/tools/ai-study-notes-summarizer): Turn long study notes and textbook chapters into revision summaries, active recall flashcards, and formula sheets. - [Document to Markdown & Clean Text Converter](https://omnitools.net/tools/document-to-markdown-converter): Convert HTML, rich notes, and messy document excerpts into clean Markdown and plain text with PDF line-break fixes. - [Free Studocu Document Reader & Notes Downloader](https://omnitools.net/tools/studocu-document-downloader): Inspect, read, format, and download academic study sheets, university summaries, and lecture notes into clean printable TXT/PDF. ### Images - [Image Compressor](https://omnitools.net/tools/image-compressor): Compress JPEG, PNG, and WebP images up to 80% with zero quality loss in your browser. - [Image Resizer](https://omnitools.net/tools/image-resizer): Resize images to exact pixel dimensions with aspect ratio lock and percentage presets. ### Generators & Randomizers - [Japanese Name Generator](https://omnitools.net/tools/japanese-name-generator): Generate authentic Japanese names with Kanji characters, Hiragana, English pronunciations, and deep meanings. ## Legal & Informational Pages - [About Us](https://omnitools.net/about): About OmniTools, mission, architecture and team. - [Privacy Policy](https://omnitools.net/privacy): Details on client-side security and data privacy. - [Terms of Service](https://omnitools.net/terms): Usage conditions and license terms. - [Contact Support](https://omnitools.net/contact): Reach out for bug reports, tool requests and inquiries. - [Sitemap](https://omnitools.net/sitemap.xml): Complete XML sitemap with Video & Image extensions.