Tools that run in your browser

Convert PNG, JPG, WebP, GIF, SVG and more into a Base64 string or data URI.

Paste a Base64 string or data URI and preview, download, or copy the image.

Fetch an image by URL and convert it to Base64 — with graceful CORS handling.

Convert iPhone HEIC and HEIF photos to JPG or PNG in your browser, one or many at once, with ZIP download.

Extract the dominant colours from an image with HEX, RGB, HSL and share. Export JSON, CSS variables or text.

Trace PNG, JPG and other images into real SVG vector paths with black-and-white or colour modes.

Encode plain text and full Unicode to Base64 live as you type.

Decode a Base64 string back to readable UTF-8 text instantly.

Turn typed text into handwriting-style pages with local fonts, ink colours and ruled or grid paper. Download PNG or PDF.

Turn text into ASCII art banners with classic FIGlet styles, width, alignment and frames. Copy plain text.

Encrypt and decrypt text with a password using AES-256-GCM and PBKDF2 from the Web Crypto API.

Convert typed or pasted text into a paginated PDF with page size, margins, font size and page numbers.

Turn an image into a ready-to-paste data: URI for HTML or CSS.

Test a regular expression against sample text with flags, live match highlighting, capture groups, and replace mode.

Convert JSON to YAML and YAML to JSON with clean formatting and exact line-and-column errors.

Compare two JSON documents and see added, removed and changed values in a nested, colour-coded tree.

Build flexbox layouts visually with live preview, item controls and clean copy-ready CSS and HTML.

Design CSS grid layouts with track sizes, gaps, item placement, visible grid lines and clean CSS and HTML.

Create CSS keyframe animations — fade, slide, bounce, pulse and more — with a live preview and clean CSS.

Build Markdown tables visually with alignment, row and column editing and CSV or spreadsheet paste.

Strip the data: prefix from a data URI to get the raw Base64 payload.

Wrap raw Base64 in a valid data: URI with an auto-detected MIME type.

Convert CSV to Excel .xlsx and Excel worksheets to CSV with delimiter detection and a table preview.

Convert XML to JSON and JSON to XML with a documented mapping, safe parsing and line-and-column errors.

Convert pasted HTML to clean Markdown — headings, links, lists, code and tables — with unsafe content stripped.

Check characters, padding, length, and data URI format with clear results.

Check the syntax of email address lists locally. Find invalid entries and duplicates, then export clean lists.

Check the syntax of URLs in bulk — protocol, host, port, path, query and percent-encoding. Nothing is fetched.

Validate IPv4, IPv6 and CIDR in bulk and see if each address is public, private, loopback or reserved.

Check card-number syntax locally with the Luhn checksum and likely network. Results are masked.

Inspect size, MIME, dimensions, overhead, and decoded estimates of a Base64 string.

See the real format, dimensions, aspect ratio, megapixels, transparency and memory use of many images.

Find exact duplicate files locally by SHA-256 checksum, with duplicate groups, reclaimable space and reports.

Build 256-bin red, green, blue and luminance histograms of an image, with mean values and CSV export.

Resize images by pixels or percentage with aspect-lock, presets, and social-media sizes.

Shrink PNG, JPG, and WebP with a live quality slider and before/after size readout.

Crop freely or to fixed ratios (1:1, 16:9, 4:3, 3:2) with a live drag overlay.

Rotate by 90, 180, 270 degrees or any custom angle, with a live preview.

Mirror an image horizontally or vertically and download the result.

Convert between PNG, JPG, WebP, BMP, and more, with quality control where supported.

Find the best quality-to-size balance with a target-size estimator and live preview.

Slide between original and processed images with sizes and difference side by side.

Convert JPG and JPEG images to lossless PNG in your browser. Private, client-side, no uploads.

Convert PNG images to JPG with a background colour for transparent areas. Client-side, no uploads.

Convert WebP images to high-quality JPG in your browser. Private, client-side, no uploads.

Convert JPG and JPEG images to compact WebP with a quality slider. Client-side, no uploads.

Convert PNG images to WebP with transparency support and a quality slider. Client-side, no uploads.

Convert WebP images to lossless PNG with transparency support. Client-side, no uploads.

Convert AVIF to PNG or JPG, and encode PNG or JPG to AVIF where your browser supports it. Client-side, no uploads.

Convert SVG to PNG, JPG, or WebP at any scale, with crisp vector rendering before rasterizing. Client-side, no uploads.

Generate a multi-size .ico file (16–256 px) from any image, in your browser.

Generate a full favicon package — ICO, PNGs, Apple touch, Android, and a web manifest — as a ZIP.

Add a text or image watermark with opacity, rotation, scale, position, and tiling. Client-side.

Add styled text layers to an image with fonts, color, stroke, shadow, alignment, and rotation.

Make memes with top and bottom captions in the classic Impact style, stroke, and shadow. Client-side.

Blur an entire image or just a region with an adjustable Gaussian radius. Undo, redo, download.

Pixelate an entire image or a region with an adjustable pixel size. Undo, redo, download.

Sharpen an image with an adjustable intensity and live preview. Reset and download.

Adjust image brightness with a live slider, undo, redo, and download.

Adjust image contrast with a live slider, undo, redo, and download.

Split an image into rows, columns, or a grid, then download the parts as a ZIP.

Merge multiple images horizontally, vertically, or in a grid with spacing and a background colour.

Remove photo backgrounds in your browser with a bundled AI model — transparent PNG or a new solid background.

Extract English or Hindi (Devanagari) text from images with a bundled OCR engine — editable, copyable output.

Combine photos into 2, 3, 4, 6 or 9-image grids or custom layouts and export a PNG or JPG collage.

Turn a sequence of images into a real animated GIF with frame delay, loop, size and colour settings.

Reduce GIF file size by resizing, dropping frames, reducing colours and optimising frames — animation kept.

Click any pixel in a PNG, JPG or WebP image to read its exact HEX, RGB, HSL, HSV and alpha values.

Queue many images and resize, compress, or convert them all, then download a ZIP.

Remove EXIF, GPS, XMP and other metadata from many images by re-encoding them locally. Download a ZIP.

Add a text or logo watermark to many images with live preview, opacity, rotation and tiling. Download a ZIP.

Generate one QR code per CSV row as PNG or SVG with custom colours and size, downloaded as a ZIP.

Generate a clean <img> tag with a data URI, alt text, dimensions, lazy loading, class, and id.

Build a background-image rule with size, repeat, position, attachment, origin, and clip, with live preview.

Create inline or reference-style Markdown image syntax with alt text and an optional title.

Produce a pretty or minified JSON object with the data URI, MIME, dimensions, and metadata.

Generate a well-formed XML document with image metadata and CDATA-wrapped Base64 data.

Generate a production-ready React function component with props, lazy loading, and accessibility.

Generate a single-file Vue 3 component with props, alt text, and lazy loading.

Generate an Angular standalone component with property bindings, attributes, and accessibility.

Generate a next/image component with width, height, priority, placeholder, and lazy loading.

Generate email-safe, table-based HTML with inline styles and Outlook-friendly markup.

Generate five ways to embed an image or SVG: inline, object, embed, img tag, and CSS background.

Edit HTML or CSS embed code and see it render live, with dark-mode preview and instant feedback.

Build an HTML table visually — rows, columns, header, footer, alignment, merged cells, and a responsive option — then copy or download clean, framework-free HTML.

Design a CSS button with radius, gradient, shadow, hover and active states, font, padding, and animation, with a live preview. Copy or download the CSS.

Build a CSS box-shadow with X/Y offset, blur, spread, color, inset, and multiple layered shadows, with a live preview. Copy or download the CSS.

Build a CSS border-radius with individual or linked corners and elliptical radii, with a live preview. Copy or download the CSS.

Build a CSS clip-path — circle, ellipse, polygon, inset, and custom polygon points — with a live preview. Copy or download the CSS.

Calculate the exact encoded Base64 length for any input size, including padding.

Estimate the decoded byte size of a Base64 string from its length and padding.

Benchmark how fast your browser encodes and decodes Base64 of varying sizes.

Count characters, bytes, words, and lines, with a live Base64-validity check.

Wrap a long Base64 string to fixed-width lines (MIME 76, PEM 64, or custom).

Collapse a wrapped Base64 string back into a single continuous line.

Convert between standard and URL-safe alphabets and fix or strip padding.

Remove spaces, tabs, and newlines from a string to get a clean, compact payload.

Break a data URI into its scheme, MIME type, charset, encoding flag, and payload.

Build curl commands for Bash, PowerShell and Command Prompt with safe quoting and hidden secrets.

Convert Linux permissions between octal and symbolic notation, including setuid, setgid and sticky bits.

Beautify and validate JSON with indentation, error detection, and a collapsible tree view.

Compress JSON to a single line by removing all unnecessary whitespace.

Check JSON for syntax errors and get the exact line and column of any problem.

Beautify HTML with clean indentation, plus a live preview of the markup.

Minify HTML by stripping comments and collapsing whitespace.

Beautify CSS with consistent indentation and spacing for readable stylesheets.

Minify CSS by removing comments and whitespace for smaller stylesheets.

Beautify JavaScript with proper indentation and line breaks, string-safe.

Minify JavaScript by stripping comments and collapsing whitespace, safely.

Beautify and minify XML with indentation and a validity check.

Validate XML for well-formedness and see the first parse error.

Format, re-indent, and validate YAML with clear parse errors — all in your browser.

Convert CSV to JSON with delimiter choice, header detection, and Unicode support.

Convert a JSON array to CSV with automatic headers and nested-key flattening.

Beautify and indent SQL with keyword casing options and preserved comments.

Open CSV or TSV data in an editable table: edit cells, add or remove rows and columns, sort, filter and export.

Validate JSON against a JSON Schema (Draft 2020-12 subset) with JSON paths, schema paths and clear messages.

Test JSONPath expressions with members, wildcards, indexes, unions, slices and recursive descent.

Evaluate XPath 1.0 expressions against XML with namespace prefixes and safe parsing.

Percent-encode text for safe use in URLs and query strings, in real time.

Decode percent-encoded URLs and query strings back to readable text.

Convert text to \uXXXX Unicode escape sequences, with an ASCII-only option.

Convert \uXXXX escape sequences back into readable Unicode text.

Escape HTML special characters into entities so markup renders as text.

Convert HTML entities back into their original characters.

Compare two text blocks and highlight added, removed, and unchanged lines.

Convert text between upper, lower, title, camel, pascal, snake, and kebab case.

Turn any text into a clean, URL-friendly slug.

Sort, reverse, deduplicate, and remove empty lines, plus reverse the whole text.

Count words, characters, sentences, and reading time for any text.

Estimate reading time, speaking time, and page count for any text, with an adjustable words-per-minute speed. In your browser.

Remove duplicate lines with case-sensitive or case-insensitive matching, preserve order or sort after. Live preview.

Sort lines alphabetically, numerically, naturally, or randomly, ascending or descending, and drop empty lines.

Reverse characters, words, sentences, or the order of lines and paragraphs. Instant, in-browser.

Generate random letters, words, sentences, or paragraphs at a custom length. All in your browser.

Convert between text, binary, decimal, and hexadecimal in both directions. Instant, in-browser.

Convert text to ASCII character codes and back, with a full reference table. In your browser.

Convert text to Morse code and back, with an optional audio beep playback. All in your browser.

Find and replace text with regular expressions, case sensitivity, and whole-word matching, with a live preview.

Clean text by removing empty lines, trimming spaces, normalizing line endings, removing tabs, and normalizing Unicode.

Collapse multiple spaces, strip leading and trailing spaces, and convert tabs — while keeping words and lines intact.

Count total, empty, and non-empty lines, with average line length and the longest line. Instant, in-browser.

Split text by character count, word count, line count, or a delimiter, and download the parts. In your browser.

Write Markdown and see a live rendered preview — headings, lists, tables, code, and links.

Convert Markdown to clean, properly escaped HTML you can copy or download.

Repeat any text up to 100,000 times with a separator, prefix and suffix, on one line or one item per line.

Measure your typing speed and accuracy with timed tests: gross and net WPM, CPM, accuracy and error counts.

Generate one or many RFC 4122 version 4 UUIDs, with history.

Convert between Unix timestamps, milliseconds, and human-readable dates.

Generate random strings, numbers, passwords, hex, RGB, colors, Base64, and bytes.

Generate placeholder lorem ipsum by words, sentences, or paragraphs.

Build a cron expression with a simple field builder, common presets, and a plain-English explanation.

Generate a .gitignore from rule groups for common languages, editors and operating systems.

Generate an MD5 hash from text or a file, instantly in your browser.

Generate a SHA-1 hash from text or a file using the Web Crypto API.

Generate a SHA-256 hash from text or a file using the Web Crypto API.

Generate a SHA-384 hash from text or a file using the Web Crypto API.

Generate a SHA-512 hash from text or a file using the Web Crypto API.

Generate keyed HMAC signatures (SHA-1/256/384/512) from a message and secret key.

Compute a CRC32 checksum from text or a file in your browser.

Hash one or more files with MD5, SHA-1, SHA-256, SHA-384, and SHA-512 at once.

Generate strong, customizable, or pronounceable passwords with a secure random source.

Analyze password strength, entropy, and estimated crack time, entirely in your browser.

Decode a JSON Web Token into its header, payload, and signature without verification.

Inspect a JWT with decoded claims, timestamps, and expiry warnings.

View a JWT as pretty-printed header and payload JSON, side by side.

Generate bcrypt password hashes in your browser with a custom cost factor and execution-time display. Nothing is uploaded.

Generate random alphabetic, numeric, alphanumeric, hex, Base64, or custom-charset strings with a secure random source. In-browser.

Generate cryptographically secure random numbers with min/max, integer or decimal, unique values, and multiple results. In-browser.

Generate cryptographically secure tokens — 16/32/64/128 bytes as hex, Base64, or URL-safe, plus JWT-secret and API-key presets. In-browser.

Measure password entropy, strength score, estimated crack time, and character pool, with suggestions to improve it. In-browser.

Identify likely hash algorithms from a hash string — bcrypt, MD5, SHA family, Argon2, and more — with confidence levels. In-browser.

Generate memorable secure passphrases of 3–10 words with separators, capitalization, numbers, symbols, and an entropy readout. In-browser.

Generate custom-length hexadecimal strings from a cryptographically secure random source. In your browser.

Generate secure random bytes and view them as hex, binary, Base64, or decimal. Copy or download. In your browser.

Generate secure 4, 6, 8-digit or custom-length PINs, with an option for no repeated digits. In your browser.

Break a URL into protocol, host, port, path, query, hash, and parameters.

Detect the MIME type and category of a file from its content signature.

View camera, exposure, date, and GPS metadata embedded in a JPEG photo.

Remove EXIF and other metadata from an image by re-encoding it locally.

Generate SEO meta tags — title, description, keywords, robots, author, charset, viewport, and theme color — with a live search-result preview. Copy or download the HTML.

Generate Open Graph meta tags — og:title, og:description, og:image, og:url, og:type, og:locale, og:site_name — with a live social-card preview. Copy or download.

Generate Twitter Card meta tags for summary, summary large image, player, and app cards, with a live preview. Copy or download the HTML.

Generate hreflang link tags for multiple languages and regional variants, including x-default, with validation. Copy or download the HTML.

Capture a screenshot of your own HTML or same-origin content in the browser, with an honest explanation of cross-origin limits. No external services.

Paste raw HTTP headers to parse them into name/value pairs with duplicate and invalid-line detection.

Parse a User-Agent string into browser, version, engine, OS, device, and mobile/desktop.

Pick a color and read its HEX, RGB, HSL, and CMYK values instantly.

Convert colors between HEX and RGB in both directions.

Convert colors between HEX and HSL in both directions.

Convert colors between HEX and CMYK in both directions.

Build CSS linear and radial gradients with a live preview and copyable code.

Generate random colors with HEX, RGB, and HSL values.

Generate harmonious color palettes from a base color.

Check WCAG color contrast ratios for accessible text and backgrounds.

Generate QR codes for text, URLs, email, phone, SMS, WiFi, and vCard. Download PNG or SVG.

Decode a QR code from an uploaded or pasted image, entirely in your browser.

Generate Code 128, EAN-13, and UPC-A barcodes and download them.

Decode EAN-13 and UPC-A barcodes from an uploaded image, in your browser.

Combine images (PNG, JPG, WebP, and more) into a single PDF with page size, orientation, and margins. Client-side, no uploads.

Merge multiple PDF files into one, reorder them first, and download. Entirely in your browser.

Split a PDF by every page, a custom range, or selected pages, and download as a ZIP. Client-side.

Rotate all or selected pages of a PDF by 90, 180, or 270 degrees, then download. In your browser.

Extract embedded images from a PDF at original quality, preview them, and download individually or as a ZIP.

Remove pages from a PDF using a thumbnail view, undo before export, and download the new PDF. Client-side.

Reorder PDF pages by dragging thumbnails, reverse or sort, preview, and download. In your browser.

View a PDF with zoom, fit, rotate, page navigation, a thumbnail sidebar, and fullscreen. Private, client-side.

Optimize and shrink a PDF in your browser, with size and saving estimates. Honest about browser limits.

Rotate, delete, and reorder pages in one place, then export the final PDF. A full page workspace, client-side.

Convert PDF pages to high-quality JPG images with page ranges, quality and resolution. One JPG or a ZIP, client-side.

Convert PDF pages to sharp PNG images with page ranges, resolution and a white or transparent background. In your browser.

Add page numbers to a PDF with six positions, custom font size, color, margin, start number and format. Preview, then download.

Add a text or image watermark to PDF pages with opacity, rotation, size and position. Preview and download, client-side.

Extract selectable text from a PDF page by page, edit it, copy it, or download a .txt file. Runs in your browser.

Crop PDF margins on all or selected pages with presets or exact values in millimetres. Vector content stays sharp.

Count the pages in one or many PDF files, with PDF version, page sizes, orientation and a combined total.

Render PDF pages as PNG or JPG thumbnails at a chosen width, with page ranges and a ZIP download.

View PDF title, author, subject, keywords, creator, producer, dates, version, page count and file size.

List every PDF page size in points, inches and millimetres with orientation, rotation and paper size.

Convert all or selected PDF pages to grayscale in your browser with Standard or High quality.

Convert PDF pages to pure black and white with an adjustable threshold and live preview.

Add a typed or drawn visual signature stamp with an optional date to chosen PDF pages.

Resize and crop any image to a perfect Instagram post (square or portrait) with guides, background, and filters. Client-side.

Resize images to the 1080×1920 Instagram Story and Reel size with safe-area guides. In your browser.

Make a 1080×1920 Instagram Reel cover with framing, background, and text-safe guides. Client-side.

Create a Facebook cover photo at the recommended size with safe-area guides and background. In your browser.

Resize images for Facebook posts (square and landscape) with crop, background, and filters. Client-side.

Make an X (Twitter) header at 1500×500 with safe-area guides, background, and framing. In your browser.

Create a LinkedIn profile banner at 1584×396 with safe-area guides and background. Client-side.

Resize images for LinkedIn posts (square and landscape) with crop, background, and filters. In your browser.

Make a 1000×1500 Pinterest pin (2:3) with framing, background, and filters. Client-side.

Create a 1280×720 YouTube thumbnail with safe-area guides, background, border, and filters. In your browser.

Make a circular WhatsApp profile photo (DP) at 640×640 with framing and background. Client-side.

Make a circular Telegram profile photo at 512×512 with framing and background. In your browser.

Design Instagram posts (square, portrait, landscape or custom) with backgrounds, photos, text layers and a logo. PNG/JPG export, in your browser.

Design 1080×1920 Instagram Stories with backgrounds, photos, text and stickers, plus a preview-only safe-area guide. PNG/JPG export.

Design Facebook post images (1200×630, square, portrait or custom) with backgrounds, text layers and a logo. PNG/JPG export, client-side.

Design images for X posts (1600×900, square, portrait or custom) with backgrounds, text layers and a logo. PNG/JPG export in your browser.

Design a 2560×1440 YouTube channel banner with the 1546×423 safe area marked and out-of-area warnings. PNG/JPG export, client-side.

Design 1080×1920 WhatsApp Status images with backgrounds, text and stickers, with touch-friendly dragging. PNG/JPG export in your browser.

Make a passport photo to country specs (India, USA, UK, and more) with background, guides, and a printable sheet. Client-side.

Make a visa photo to common standards with background selection, head-size guides, and a print sheet. In your browser.

Resize a photo to Aadhaar enrolment requirements while keeping quality. Preview and download. Client-side.

Resize a photo to PAN card application requirements. Preview and download. In your browser.

Resize and clean a signature with white or transparent background, ink enhancement, and crop. Client-side.

Compress a photo to a target file size — 20KB, 50KB, 100KB, or custom — at the best possible quality. In your browser.

Compress a signature to 20KB (or a custom size) with crop and ink colour options. Client-side.

Compress a photo or signature to common exam/recruitment sizes (20–200KB) while staying readable. In your browser.

Calculate exact age in years, months, and days from a birth date, with leap-year accuracy.

Work out percentages, percentage of a number, and what percent one value is of another.

Calculate percentage increase or decrease between an old and a new value.

Simplify ratios and solve proportions to find a missing value in A:B = C:D.

Find the mean, median, mode, sum, and range of a list of numbers.

A full scientific calculator with trig, logarithms, powers, roots, and operator precedence.

Calculate Body Mass Index in metric or imperial units, with a WHO category.

Estimate basal metabolic rate and daily calorie needs using the Mifflin-St Jeor equation.

Calculate monthly loan EMI, total interest, and total payment from principal, rate, and tenure.

Calculate simple interest and maturity amount from principal, rate, and time.

Calculate compound interest and future value with adjustable compounding frequency.

Add or remove GST/VAT with inclusive, exclusive, and reverse calculation modes.

Calculate the sale price and amount saved from an original price and discount percentage.

Calculate profit or loss and margin percentage from cost price and selling price.

Convert between metres, kilometres, miles, feet, inches, yards, and more.

Convert between kilograms, grams, pounds, ounces, stones, and tonnes.

Convert between Celsius, Fahrenheit, and Kelvin with exact formulas.

Convert between square metres, square feet, acres, hectares, and more.

Convert between litres, millilitres, gallons, cups, pints, and cubic metres.

Convert between km/h, mph, m/s, knots, and feet per second.

Convert between bytes, KB, MB, GB, TB using binary or decimal units.

Convert between seconds, minutes, hours, days, weeks, and years.

Estimate months to pay off a credit card balance, total interest and a monthly schedule, or the payment for a target date.

Find the least common multiple and greatest common factor of two or more integers, with prime factorisations and steps.

Find the symmetric percentage difference between two values, with the absolute difference and average magnitude.

Add, subtract, multiply and divide fractions and mixed numbers, simplified exactly, with steps and a decimal value.

Find the radius, diameter, circumference and area of a circle from any one of them, with formulas and a diagram.

Calculate population or sample standard deviation, variance, mean, median, range and sum for a list of numbers.

Count the days between two dates, with weeks, calendar years, months and days, and total hours, minutes and seconds.

Work out the tip, tax, total and each person’s share of a bill, with rounding options and a fair split.

Estimate fuel used and trip cost from distance, fuel efficiency and price, in km/L, L/100 km or US and Imperial mpg.

Calculate a credit-weighted GPA on a 4.0 or 10-point scale, or with your own grade points, course by course.

Find your current weighted course grade from assessment scores and weights, and the score you need to reach a target.

Solve ax² + bx + c = 0 for real, repeated or complex roots, with the discriminant, exact forms, steps and a graph.

Add or subtract days, weeks, months or years from a date and get the result date, weekday and ISO date.

Count working days between two dates, or add and subtract business days, with custom weekends and holidays.

Estimate adult ideal-weight ranges from height with the Devine, Robinson, Miller and Hamwi formulas, in kg and lb.

Estimate adult body-fat percentage with the US Navy circumference method from height, neck, waist and hip measurements.

Estimate your one-rep max with the Epley, Brzycki and Lander formulas, plus a training-load table from 95% to 50%.

Estimate maximum heart rate and moderate and vigorous exercise ranges by age, with optional Karvonen ranges from resting heart rate.

Work out total invested, net gain or loss and simple return on investment (ROI) from cost, final value and fees.

Calculate compound annual growth rate between a beginning and ending value over years and months.

Estimate how long it takes to reach a savings goal, or the monthly amount needed by a chosen date, with optional growth.

Estimate an emergency fund target from essential monthly expenses and the number of months you want to cover.

Calculate your debt-to-income ratio from gross monthly income and recurring monthly debt payments.

Total your assets and liabilities to calculate net worth, with editable rows for each item.

Estimate adult BMR (Mifflin–St Jeor), maintenance calories by activity level and general planning estimates, in metric or imperial.

Split a daily calorie figure into protein, carbohydrate and fat calories and grams from percentages totalling 100%.

Estimate adult lean body mass and fat mass with the Boer formula from sex, height and weight, in kg and lb.

Calculate adult waist-to-height ratio and percentage from height and waist in metric or imperial units, with reference ranges.

Estimate a due date from the last menstrual period and cycle length, with gestational age and days remaining.

Plan bedtimes or wake-up times with 90-minute sleep cycles and a fall-asleep allowance, in 12- or 24-hour time.

Generate validated JSON-LD for Organization, LocalBusiness, WebSite, Product, Article, FAQPage and BreadcrumbList. Copy or download.

Build a clean robots.txt with user-agent groups, Allow and Disallow paths, Crawl-delay and Sitemap lines. Copy or download.

Create sitemap.xml from URLs you paste, with de-duplication, lastmod, changefreq and priority. No crawling.

Build campaign URLs with utm_source, utm_medium, utm_campaign, term and content. Keeps existing parameters and fragments.

Generate an escaped rel="canonical" tag with optional hreflang alternates and x-default for your page head.

Generate 301, 302 and 308 redirects for Apache .htaccess, Nginx, Netlify and Vercel, with loop checks.

Test whether a URL is allowed or blocked by pasted robots.txt rules for a crawler, with the deciding group and rule.

Check canonical tags in pasted HTML for missing, multiple, relative, malformed, fragment or body-placed canonicals and self-references.

Validate hreflang tags in pasted HTML: language-region codes, duplicates, x-default, relative URLs and placement.

Generate meta robots tags and X-Robots-Tag headers with noindex, nofollow, snippet, image-preview and unavailable_after directives.

Build an escaped, grouped HTML sitemap page from URLs and titles, with paste import, reordering and duplicate checks.

Validate JSON-LD structured data locally with line/column syntax errors and checks for common schema.org types.

Cut MP3, WAV, FLAC, Ogg or Opus audio to an exact start and end time and save it in a tested format.

Join several MP3, WAV, FLAC, Ogg or Opus files into one track, in any order, with optional silence between them.

Convert audio between MP3, WAV, FLAC, Ogg Vorbis and Opus with bitrate, sample rate and channel options.

Speed up or slow down audio from 0.25× to 4× while keeping the pitch, and save it as MP3, WAV, FLAC, Ogg or Opus.

Trim MP4 or WebM videos without re-encoding at keyframes, or re-encode WebM clips for an exact cut.

Turn part of an MP4 or WebM video into an animated GIF with size, frame rate, colour and loop settings.