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Calculators, converters, PDF, text, images and much more — each with its own page. Type your data and get the result right here, with no sign-up and without your data leaving your device. Need them in your own app? The same tools are available by API.
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🕸️ Web Scraping & MonitoringFree
Barcode check digit calculator for EAN-13, UPC-A and Code 128
Get the missing check digit of a barcode: for the EAN-13 digits 400638133393 it is 1, giving the complete 4006381333931.
K
Runs in your browser
🕸️ Web Scraping & MonitoringFree
Base32 Encode and Decode Online
Encode text to Base32 or decode it back with the standard alphabet of A to Z and 2 to 7: «Hello, Base32!» becomes JBSWY3DPFQQEEYLTMUZTEII=.
K
Runs in your browser
🕸️ Web Scraping & MonitoringFree
Generate a CSS border-radius value
Turn one to four corner radii into a ready-to-paste CSS border-radius declaration: 8px 16px 24px 32px rounds the corners clockwise from the top left.
K
Runs in your browser
🕸️ Web Scraping & MonitoringFree
Generate a CSS box-shadow value
Set the shift, blur, spread and color of a shadow and get a CSS box-shadow ready to paste: 4, 8, 16 and 0 become 4px 8px 16px 0px followed by your color.
K
Runs in your browser
🕸️ Web Scraping & MonitoringFree
Breadcrumb Schema Generator
List your pages from the home page to the current one and get breadcrumb structured data ready to paste: Home, Guides and Technical SEO become positions 1, 2…
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Runs in your browser
🕸️ Web Scraping & MonitoringFree
Generate a canonical link tag from any valid HTTP URL
Paste the address you want search engines to treat as the original and get a ready-made canonical link tag: Example.COM in capitals comes back as example.com…
R
Runs in your browser
🕸️ Web Scraping & MonitoringFree
Check color contrast ratio
Compare a text color with its background and see the contrast ratio plus four separate verdicts for WCAG AA and AAA, normal and large text: black on white gives…
K
Runs in your browser
🕸️ Web Scraping & MonitoringFree
Convert CSS color formats
Convert one color between HEX, RGB, HSL and CMYK and get a value ready to copy: #ff8800 becomes hsl(32, 100%, 50%).
K
Runs in your browser
🕸️ Web Scraping & MonitoringFree
Compute next cron run times from any schedule
See exactly when a cron schedule will fire next, in UTC: 30 9 * * 1-5 counted from noon on 24 July 2026 gives 9:30 on 27, 28, 29 and 30 July, since Friday's run…
K
Runs in your browser
🕸️ Web Scraping & MonitoringFree
Generate a CSS linear or radial gradient
Pick linear or radial, set a direction or shape and list your color stops to get one CSS gradient ready to paste: 135deg with three stops at 0%, 45% and 100%…
K
Runs in your browser
🕸️ Web Scraping & MonitoringFree
CSS Selector Specificity Calculator
Paste one CSS selector and see its specificity as four counts (inline, ID, class, type): an article with an ID, a class, an attribute, :hover and an h2::before…
K
Runs in your browser
🕸️ Web Scraping & MonitoringFree
Sort CSS selectors by specificity
Paste a list of CSS selectors and get them ranked from easiest to hardest to override: button scores 0-0-1, while #app .toolbar button scores 1-1-1 and lands…
M
Runs in your browser
🕸️ Web Scraping & MonitoringFree
CSS unit converter
Convert a CSS length between px, em, rem and pt using your own base font size: with a 16 px base, 24px becomes 1.5rem and 2rem becomes 32px.
K
Runs in your browser
🕸️ Web Scraping & MonitoringFree
Convert CSV to JSON
Paste CSV with a header row and get one record per row, named after the headers: in Ada, "Compiler, pioneer", true the quoted comma stays inside the same value.
K
Runs in your browser
🕸️ Web Scraping & MonitoringFree
Generate FAQ JSON-LD
Turn your approved questions and answers into FAQPage structured data ready to paste: the delivery-time and order-change questions become one script block, kept…
R
Runs in your browser
🕸️ Web Scraping & MonitoringFree
Generate favicon HTML tags for browsers and Apple touch icons
List your icon sizes and file paths and get the link tags for your page head: 16x16, 32x32 and 180x180 come back sorted from smallest to largest, plus an Apple…
K
Runs in your browser
🕸️ Web Scraping & MonitoringFree
Generate a .gitignore template for your development stack
Pick Node, Python and macOS and get one .gitignore with 41 unique rules, each kept in its original order.
K
Runs in your browser
🕸️ Web Scraping & MonitoringFree
Generate a text hash
Type “Hello, world!”, choose SHA-256 and get a 64-character fingerprint of exactly that text. Every space, capital letter and line break counts, so two values…
K
Runs in your browser
🕸️ Web Scraping & MonitoringFree
Generate hreflang tags for multilingual pages
Enter each language version of a page with its address and get alternate link tags ready to paste: en-us is written as en-US, duplicates are refused and an…
F
Runs in your browser
🕸️ Web Scraping & MonitoringFree
Generate .htaccess redirect rules for 301 and 302 redirects
List old and new paths, such as /old-page and /new-page, choose 301 for a permanent move or 302 for a temporary one, and get exact rules that match only those…
K
Runs in your browser
🕸️ Web Scraping & MonitoringFree
HTML Entity Encoder and Decoder
Encode “Tom & Jerry <3 © 2026” and get “Tom & Jerry <3 © 2026”, ready to place in a page’s source.
K
Runs in your browser
🕸️ Web Scraping & MonitoringFree
HTTP status code lookup
Type 404 and see Not Found in the client error group, or 503 for Service Unavailable on the server side.
K
Runs in your browser
🕸️ Web Scraping & MonitoringFree
Convert JSON to CSV
Paste a list of records and get a spreadsheet-ready CSV: Ada and Grace become two rows under the same four columns, and “Compiler, pioneer” stays in one cell.
K
Runs in your browser
🕸️ Web Scraping & MonitoringFree
Convert JSON to YAML Online
Paste data written with braces and brackets and get the same content as indented YAML: a service with ports 8080 and 8443 becomes a readable list, and true…
K
Runs in your browser
🕸️ Web Scraping & MonitoringFree
Validate JSON syntax
Paste a data document and learn at once whether it can be read: a record for Ada with her roles passes, while a missing comma is reported with its line, column…
K
Runs in your browser
🕸️ Web Scraping & MonitoringFree
Generate HTML meta tags from a title and description
Enter a title such as “Coffee & Tea for Home Brewers” and a description, and get tags ready for the page head, with the ampersand escaped and repeated keywords…
K
Runs in your browser
🕸️ Web Scraping & MonitoringFree
MIME type lookup by extension
Type .json and get application/json, or png for image/png, with or without the dot and in any letter case.
K
Runs in your browser
🕸️ Web Scraping & MonitoringFree
Generate Open Graph tags for social sharing
Enter a title, a description, an image address and a type such as website or article, and get the four Open Graph tags that shape how your link looks when…
K
Runs in your browser
🕸️ Web Scraping & MonitoringFree
Generate a deterministic random password from a seed
Enter the seed release-2026, ask for 20 characters with all four character sets, and get the same password every time, with at least one capital, small letter…
K
Runs in your browser
🕸️ Web Scraping & MonitoringFree
Build a QR code payload string for URL, WiFi, vCard, SMS or email
Fill in a WiFi name like Studio;Guest and a password like tea:coffee, and get the text a scanner understands, with the semicolon and colon protected so they…
K
Runs in your browser
🕸️ Web Scraping & MonitoringFree
Parse URL query string into a key-value object
Paste a link and read what it carries: San+Jos%C3%A9 becomes San José, red+shoes becomes red shoes, and a name that repeats, such as two tags, is kept as a list…
K
Runs in your browser
🕸️ Web Scraping & MonitoringFree
Test regex against samples and inspect captured groups
Run one regular expression over a list of sample lines and see which match and what each group captured: of three samples, two match, and Gadget: 7 yields…
K
Runs in your browser
🕸️ Web Scraping & MonitoringFree
Generate robots.txt from crawler rules and a sitemap URL
List each crawler with the paths it may or may not visit, add your sitemap address, and get a ready-to-publish robots.txt: three rules for two crawlers become…
K
Runs in your browser
🕸️ Web Scraping & MonitoringFree
Generate sitemap XML from a URL list
Turn a list of full page addresses into a ready sitemap.xml: the sample's two pages, with an update date, a weekly or monthly rhythm and a priority, become one…
K
Runs in your browser
🕸️ Web Scraping & MonitoringFree
Check slug uniqueness and format
Check a proposed URL slug before you publish: summer-sale-2026 is valid and unique against spring-sale-2026, clearance and summer-sale-2025.
B
Runs in your browser
🕸️ Web Scraping & MonitoringFree
Format SQL and Pretty-Print Queries Online
Paste a one-line query and get it back readable: select … from users left join orders becomes SELECT, FROM, LEFT JOIN, WHERE, GROUP BY and ORDER BY on their own…
K
Runs in your browser
🕸️ Web Scraping & MonitoringFree
Convert SVG to data URI for CSS
Paste SVG markup and get a data URI that starts with data:image/svg+xml, ready for a CSS url() or an image source.
F
Runs in your browser
🕸️ Web Scraping & MonitoringFree
Twitter Card meta tag generator
Type a title such as Build & Ship and get Twitter Card tags ready to paste into your page's head, the ampersand safely written as &.
K
Runs in your browser
🕸️ Web Scraping & MonitoringFree
URL encode and decode
Encode text for a URL or decode it back: hello world/café becomes hello%20world%2Fcaf%C3%A9, with spaces as %20 and every reserved sign escaped.
K
Runs in your browser
🕸️ Web Scraping & MonitoringFree
Parse a User-Agent string into browser, OS, and device
Paste a User-Agent line and get it in plain words: the example reads as Chrome 126.0.0.0 on Windows 10 or 11, on a desktop.
K
Runs in your browser
🕸️ Web Scraping & MonitoringFree
Build a UTM tracking link with encoded campaign parameters
Enter a full address and the labels you track, such as source summer newsletter, medium email and campaign July launch, and get one ready-to-share link with…
K
Runs in your browser
🕸️ Web Scraping & MonitoringFree
Viewport meta tag generator for responsive web pages
Choose device-width or a fixed number such as 375 and an initial scale of 1, and get the complete viewport meta tag ready for your page's head.
M
Runs in your browser
🕸️ Web Scraping & MonitoringFree
Format XML online
Paste one long line of XML, such as a catalog of books, and get a tree indented two spaces per level, with attributes quoted consistently.
K
Runs in your browser
🕸️ Web Scraping & MonitoringFree
Convert YAML to JSON Online
Paste a YAML configuration and get the same data as structured objects and lists: in the example, ports 8080 and 8443 arrive as real numbers and true and false…
K
Runs in your browser
📅 Dates & timeFree
Calculate exact age
Someone born on 17 May 1990 is 36 years, 2 months and 8 days old on 25 July 2026, counted with real month lengths and leap years.
R
Runs in your browser
❤️ Health & fitnessFree
Calculate body mass index
Someone weighing 70 kg at 175 cm has a BMI of 22.86, in the normal range. Enter kilograms and centimeters, or pounds and inches, and get the value rounded to…
R
Runs in your browser
📅 Dates & timeFree
Count business days between dates
From 1 to 10 July 2026 there are 8 weekdays; take out the 3 July holiday and 7 business days remain.
R
Runs in your browser
💰 Finance & moneyFree
Compound interest calculator
A principal of 1000 at 5% a year, compounded 12 times a year for 10 years, earns more than half its value in interest.
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Runs in your browser
💰 Finance & moneyFree
Convert currency with a given exchange rate
If one unit of your source currency buys 0.92 units of the target, enter 0.92 and your amount is multiplied by exactly that rate, with no fee, spread or…
G
Runs in your browser
📅 Dates & timeFree
Calculate days between dates
From 15 January 2024 to 10 March 2025 there are 420 days, exactly 60 weeks, or 13 calendar months and 23 days.
R
Runs in your browser
📅 Dates & timeFree
Get the day of the week from a date
25 July 2026 falls on a Saturday, ISO weekday 6. Type any real date up to the year 9999 and get its weekday, checked against the full Gregorian leap-year rule…
R
Runs in your browser
💰 Finance & moneyFree
Calculate discounted price, final cost, and total savings
An item priced 120 with 25% off costs 90, a saving of 30. Enter one discount or an ordered list of them and see the final price, each percentage applied and the…
F
Runs in your browser
🧭 Travel & geographyFree
Calculate trip fuel cost from distance, efficiency and fuel price
A 420-mile trip in a car doing 35 miles per gallon uses 12 gallons, and at 3.75 per gallon the fuel costs 45.
B
Runs in your browser
🎓 EducationFree
Calculate GPA from grades and credit hours
Courses worth 4 grade points over 3 credits, 3.3 over 4 credits and 2.7 over 2 credits give 30.6 quality points across 9 credits: a weighted GPA of 3.4.
F
Runs in your browser
❤️ Health & fitnessFree
Calculate target heart rate zones with the Karvonen method
At 40 with a resting pulse of 60, the Karvonen method gives an estimated maximum of 180 bpm and five zones, from 120–132 bpm for easy aerobic work up to 168–180…
B
Runs in your browser
❤️ Health & fitnessFree
Ideal weight range calculator
For a man 175 cm tall, the Robinson formula gives 68.91 kg and the Devine formula 70.46 kg, so the reference range is 68.91 to 70.46 kg.
R
Runs in your browser
📅 Dates & timeFree
Check if a year is a leap year
The year 2024 is a leap year because it splits evenly by 4 but not by 100. Enter any positive year to get a yes or no plus the three checks behind it, including…
R
Runs in your browser
🎓 EducationFree
Convert percentage to letter grade
On the standard US scale, 87.5% is a B because it clears the 80% cutoff but not 90%. Use the A–F scale or enter your own table of grades and minimums, with…
R
Runs in your browser
💰 Finance & moneyFree
Calculate a loan amortization schedule row
Jump straight to one payment of a fixed-rate loan: on 250,000 at 6.5% over 360 months, payment 12 is 1,580.17, of which 1,340.33 is interest, leaving 247,205.69…
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Runs in your browser
💰 Finance & moneyFree
Calculate loan monthly payment with interest
Know the equal amount you will pay every month: borrowing 250,000 at 6.5% for 360 months means a payment of 1,580.17 in principal and interest, with taxes…
F
Runs in your browser
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Get your key
Create an account with your email and add balance when you need it. No subscription, no sales call.
2
Call the endpoint
One authenticated POST. The API returns a task_id immediately — copy-paste snippets in five languages on every page.
3
Collect the result
Receive a signed webhook the moment it's ready, or fetch a signed link. A failed task is never charged.
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On-device utilities — hash, QR, JSON, Text→PDF and more — run in your browser. No account, no limits.
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The full API — 7800+ capabilities — billed only for what you run, from $0.002 per call. No monthly fee.
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