General Calculators
Percentage Calculator
Calculate percentage increases, decreases, discounts, and fractions instantly with step-by-step math.
A comprehensive directory of 59 free online browser utilities and calculators for developers, writers, students, and webmasters. Fast, accessible, and engineered for daily productivity.
Calculate percentage increases, decreases, discounts, and fractions instantly with step-by-step math.
Calculate retail sale prices, stacked coupon savings, sales tax, and reverse original prices with full breakdown.
Calculate arithmetic mean, median, mode, range, standard deviation, and variance for any dataset instantly.
Calculate exact age in years, months, and days, duration between calendar dates, and next birthday countdowns.
Calculate Body Mass Index using metric or imperial measurements with healthy weight target guidance.
Calculate tax-inclusive (gross) and tax-exclusive (net) totals with customizable GST, VAT, and sales tax rates.
Compute mean, median, modes, quartiles (Q1, Q3), interquartile range (IQR), standard error, and frequency tables.
Identify statistical anomalies and extreme data deviations using Tukey’s IQR fences and Gaussian Z-Scores.
Count words, characters, sentences, paragraphs, and estimate reading and speaking times in real time.
Convert text between UPPERCASE, lowercase, Title Case, Sentence case, Capitalized Case, and alternating case.
Filter repeated lines from text lists while preserving original sequence order with optional case sensitivity.
Generate customized Latin placeholder dummy text by paragraphs, sentences, or words for design mockups.
Generate clean, search-engine-friendly URL slugs with safe hyphenation and international diacritic stripping.
Transform plain text into 25+ fancy Unicode fonts, cursive script, gothic fraktur, and small caps for social profiles.
Generate platform-optimized hashtag clusters for Instagram, LinkedIn, X, TikTok, and YouTube with casing controls.
Calculate Twitter weighted character limits with official URL and emoji weights, plus an automatic thread splitter.
Compress JPG, PNG, and WebP images directly in your browser with adjustable quality and instant file size savings.
Convert images between JPG, PNG, and WebP formats in browser memory with transparency preservation.
Scale pixel width and height dimensions with aspect ratio locking and smooth canvas resampling.
Encode images into Base64 data URLs or decode Base64 strings into downloadable PNG and JPG images.
Generate high-contrast QR codes for URLs, contacts, and text with vector SVG and high-res PNG downloads.
Download high-definition video cover thumbnails (1280×720 HD, SD, HQ) directly from YouTube video links.
Extract text from photos, receipts, documents, and screenshots using client-side optical character recognition.
Generate HTML5 meta tags, Open Graph attributes, Twitter card tags, and preview live Google search snippets.
Create standard sitemaps.org XML files with custom priorities, change frequencies, and bulk URL input.
Validate sitemaps against official protocol standards, verify URLs, check last-modified timestamps, and detect syntax errors.
Create search crawler directives, bot exclusion rules, safe crawl presets, and sitemap references.
Query authoritative DNS records in real time including A, AAAA, MX, TXT, NS, CNAME, and SOA with TTL values.
Test website HTTP response codes (200, 301, 302, 404, 500) and follow redirect chains hop by hop.
Query authoritative domain registration records via modern ICANN RDAP to inspect ownership, dates, and nameservers.
Measure website server response times, DNS lookup speeds, Time to First Byte (TTFB), and page latency.
Detect your public IPv4 or IPv6 address, internet service provider (ISP), and approximate network routing node without logging.
Safely encode and decode query parameters, full URIs, and form-urlencoded strings adhering to standard percent specifications.
Generate structured baseline Privacy Policy and Terms & Conditions drafts with tailored cookie and analytics disclosures.
Format unformatted HTML, CSS stylesheets, and JavaScript code with clean 2-space, 4-space, or tab indentation.
Compress HTML, CSS, and JavaScript by removing comments and unnecessary whitespace with exact byte reduction metrics.
Parse, validate, and explore JSON payloads with line/column syntax error diagnostics and an interactive collapsible tree view.
Inspect live SSL/TLS certificates, verify chain of trust, monitor days until expiration, and check TLS protocol support.
Lookup any public IPv4 or IPv6 address or domain to inspect geolocation, country, city, ISP organization, and autonomous system number.
Convert color codes between HEX, RGB, and HSL with live WCAG 2.2 contrast ratio accessibility calculations.
Convert length, mass, temperature, area, volume, and digital storage units with exact international conversion factors.
Convert CSV spreadsheets and tabular data into clean JSON arrays or objects with delimiter auto-detection and type parsing.
Convert JSON data arrays into standardized CSV spreadsheets ready for Microsoft Excel and Google Sheets.
Generate high-entropy, random passwords using the browser’s native Web Crypto API rejection sampling.
Compute MD5 and Web Crypto SHA-256 cryptographic message digests client-side in memory with zero transmission.
Convert Unix epochs in seconds and milliseconds to readable UTC and local dates with timezone controls.
Convert dates and times across global time zones simultaneously, compare UTC offsets, and plan international meetings.
Calculate semester GPA, cumulative CGPA, and project required grades with 4.0, 4.33, and 5.0 academic grading scales.
Perform trigonometric (DEG/RAD), logarithmic, exponential, root, and factorial calculations with keyboard navigation.
Bi-directional converter between Binary, Decimal, Hexadecimal, and Octal with an interactive 8-bit visualizer.
Convert numbers and currencies to legal bank cheque text, standard English words, and Indian lakh/crore formats.
Add, subtract, multiply, and divide proper, improper, and mixed fractions with step-by-step reduction derivations.
Perform matrix addition, multiplication, determinants, inverses, and transpositions for 2×2 up to 5×5 matrices.
Combine multiple PDF documents into a single organized PDF file in seconds with custom reordering.
Extract specific pages or page ranges from a PDF document, or split all pages into separate files.
Convert JPG, PNG, and WebP images to high-quality PDF documents with customizable page sizes and margins.
Extract and rasterize PDF pages into high-resolution JPG or PNG images directly in your browser.
Convert PDF documents into editable Microsoft Word (.docx) files directly in your browser with zero server uploads.
Convert Microsoft Word (.docx) documents into high-quality vector PDF files with custom margins and typography.