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New capabilities

Fresh in the kit — just landed.

New✅ ValidationCosta Rica ID number validatorEnter 1-0234-0567 and you learn it is a valid personal cédula, stored as 102340567 and shown in its usual hyphenated…NNitroRuns in your browserFreeOpen →New💰 Finance & moneyCosta Rica severance calculatorThirty months on an average ₡600,000, then a dismissal without just cause: the settlement comes to ₡2,040,000 in notice…NNitroRuns in your browserFreeOpen →New💰 Finance & moneyCosta Rica employer payroll charges 2026A ₡1,000,000 monthly salary costs a Costa Rican employer ₡1,268,300 in 2026, because ₡268,300 in social charges, the…NNitroRuns in your browserFreeOpen →New💰 Finance & moneyCosta Rica net salary calculator 2026On ₡1,000,000 gross a month, an employee in Costa Rica takes home ₡883,500 in 2026: ₡108,300 goes to the CCSS and ₡8,200…NNitroRuns in your browserFreeOpen →New💰 Finance & moneyCosta Rica aguinaldo calculatorYour aguinaldo is one twelfth of everything earned from 1 December to 30 November: twelve months at ₡600,000 come to an…NNitroRuns in your browserFreeOpen →New➗ MathNull space calculatorThe rows (1, 2, 3) and (2, 4, 6) have rank 1, so their null space needs two basis vectors: (−2, 1, 0) and (−3, 0, 1).SsamuraiRuns in your browserFreeOpen →New➗ MathLogical NOR calculatorFalse NOR false is true, and every other pair gives false. Enter two true-or-false values and get the NOR result with…PPavilionRuns in your browserFreeOpen →New➗ MathMultiply complex numbersMultiply two complex numbers in rectangular form: (1 + 2i)(3 + 4i) gives −5 + 10i, using (ac − bd) + (ad + bc)i with i²…AabuelaRuns in your browserFreeOpen →New➗ MathMöbius strip calculatorGive the band width and the centreline radius and get the Möbius strip's area and its single edge: a band 1 wide on a…SsamuraiRuns in your browserFreeOpen →New➗ MathLong multiplication calculatorMultiply two whole numbers the schoolbook way and see every partial product: 123 times 45 gives the rows 615 and 4920…AabuelaRuns in your browserFreeOpen →New➗ MathMean calculatorAdd up a list and divide by how many numbers it holds: 2, 4, 6, 8 and 10 sum to 30, so the mean is 6.PPavilionRuns in your browserFreeOpen →New➗ MathLog2 calculatorEnter a positive number and get its base-2 logarithm, the power of two that produces it: log2 of 8 is 3, of one half is…SsamuraiRuns in your browserFreeOpen →

Popular capabilities

Most viewed first; free tools win ties.

#1📈 SEOValidate a redirect mapCatch redirect mistakes while the map is still a file: in /a → /b → /c → /d, the route from /a takes three hops and is…GGalaRuns in your browserFreeOpen →#2📄 Documents & PDFConvert HTML to PDFTurn an invoice template or a rendered report written in HTML into a PDF that looks exactly like the page a modern…NNitroAPI$0.040Open →#3📄 Documents & PDFJPG to PDFThree photos of a damaged part, or several receipts snapped on a phone, become one PDF with one page per image, in the…NNitroAPI$0.002Open →#4📄 Documents & PDFURL to PDFKeep a competitor's advertised claims, a government notice or a partner's terms exactly as they appeared on a given…NNitroAPI$0.040Open →#5🌐 TranslationSort a list alphabeticallyWith Spanish rules, “nandu” comes before “ñandú” and “Ñoño”, and “Ángel” sits right after “angel” instead of at the end…GGalaRuns in your browserFreeOpen →#6✅ ValidationValidate a phone numberType +34 600 11 12 22 and you get +34600111222, confirmed as a valid Spanish number of 11 digits, ready for your contact…NNitroRuns in your browserFreeOpen →#7✅ ValidationColor contrast checkerKnow whether text will stay readable for everyone, whatever your own screen shows: dark gray #111827 on white has a…GGalaRuns in your browserFreeOpen →#8🖼️ ImagesAdd a logo to a QR codeAdd your logo to the center of a QR code without breaking it: the error-correction level, the logo's size and the blank…NNitroRuns in your browserFreeOpen →#9🕸️ Web Scraping & MonitoringRemove tracking parameters from a URLTwo UTM tags gone, the id parameter kept and nothing else in the link touched: paste a link to strip known tracking…GGalaRuns in your browserFreeOpen →#10📄 Documents & PDFSplit a PDFCut a three-page PDF every two pages and you get two files: pages 1 and 2, then page 3.NNitroAPI$0.002Open →#11📄 Documents & PDFExtract text from a PDFGet the words a native PDF already contains as plain text in reading order, without fonts, columns or coordinates…NNitroAPI$0.002Open →#12✍️ Text & AISummarize a textNobody on your team has to skim a 4,000-word document again to find the three sentences that matter: paste it in and get…NNitroAPI$0.003Open →

Find your tool

Search in your own words or filter by category.

🕸️ Web Scraping & MonitoringAPI
Check security headers
Check which security headers a site really sends, such as Content-Security-Policy, Strict-Transport-Security and X-Frame-Options, and see for each one whether…
NNitro
$0.002
🕸️ Web Scraping & MonitoringAPI
Check redirects
See every stop a link makes before it lands: each hop with its redirect code, target address and response time, up to the final page.
NNitro
$0.002
🕸️ Web Scraping & MonitoringAPI
Check HTTP status
Give it one address or a whole list and see the code each one answers with and how long it took: a 200 in 180 milliseconds next to a 404 or a slow 500, in one…
NNitro
$0.002
🕸️ Web Scraping & MonitoringAPI
Find broken links
Enter a page address and get every link on it with its result: a clean 200, a 404, a server error, a timeout or a redirect chain.
NNitro
$0.002
🕸️ Web Scraping & MonitoringAPI
Detect a site's technology
Enter a site's address and see its CMS, JavaScript framework, analytics, payment processor and CDN, detected from clues such as a meta generator tag, a…
NNitro
$0.040
🕸️ Web Scraping & MonitoringAPI
Audit cookies
Enter a page address and get every cookie it sets, with its name, domain, expiry and category (strictly necessary, functional, analytics or marketing), plus the…
NNitro
$0.040
🕸️ Web Scraping & MonitoringAPI
Accessibility audit
Find out exactly which element breaks accessibility: each problem, such as an image without alt text or a form field without a label, comes with its WCAG…
NNitro
$0.040
🕸️ Web Scraping & MonitoringAPI
Measure Core Web Vitals
Test a staging or live URL and get its Largest Contentful Paint, Cumulative Layout Shift and Interaction to Next Paint, measured under repeatable conditions.
NNitro
$0.040
🕸️ Web Scraping & MonitoringAPI
Prerender for bots
Send a page built with client-side JavaScript and get back the final HTML a visitor would see, with meta tags, structured data and late-loading content in…
NNitro
$0.040
📈 SEOAPI
Generate meta tags
Get a title of about 60 characters and a description of about 155, written from what the page actually says, so the snippet reads as a complete thought instead…
NNitro
$0.003
📈 SEOAPI
Audit a page for SEO
Point it at a page and get its SEO findings ranked by real cost: a broken canonical on a top landing page ranks above a missing alt on a footer icon.
NNitro
$0.040
📈 SEOAPI
Audit internal links
Find the pages your site forgot: a page listed in your sitemap that receives zero internal links is reported as an orphan.
NNitro
$0.002
📈 SEOAPI
Analyze robots.txt
Know exactly what your robots.txt blocks: one leftover Disallow: / from staging can wall off a whole live site.
NNitro
$0.002
📈 SEOAPI
Generate a sitemap
Build a sitemap from the site as it really is: the crawl follows internal links, honours robots.txt and noindex, and stays on your own domain.
NNitro
$0.002
📈 SEOAPI
Generate JSON-LD
Get a page's structured data without writing it by hand: a product page's title, price and availability land in the Product type, required properties filled and…
NNitro
$0.003
📈 SEOAPI
Audit alt text
Give it a list of pages and every image is sorted into missing, empty, decorative or adequate alt text.
NNitro
$0.066
📈 SEOAPI
SEO content brief
Send a topic and its keywords and get a writer-ready skeleton: keywords grouped into sections in a logical order, an h2 or h3 heading for each and its likely…
NNitro
$0.003
📈 SEOAPI
Write click-worthy titles
Give it a page topic and target keyword and get several title tags back: keyword-first, benefit-led, a question and a number-led version, each built to survive…
NNitro
$0.003
📈 SEOAPI
Cluster keywords by intent
Turn a keyword export into a page plan: 'best hiking boots' and 'top hiking boots 2026' share a group because they mean the same.
NNitro
$0.002
📈 SEOAPI
YouTube description
Get the text that decides whether a video is found: a title option, a full description, a tag list and timestamped chapters, so a 40-minute video no longer…
NNitro
$0.003
📈 SEOSoon
Optimize images for SEO
A photo straight off a camera is often three to ten times heavier than the web needs. This tool resizes and re-encodes it so it looks the same, strips unneeded…
NNitro
$0.002
🗂️ Data & FilesAPI
Excel to JSON
Turn an Excel workbook into clean records an application can use: in the example, three rows come out, with Ada Lovelace's age as the number 36 and an Arabic…
NNitro
$0.002
🗂️ Data & FilesAPI
JSON to Excel
Give business colleagues a workbook instead of a data file: the field names become the header row, every record becomes a row, and numbers are stored as real…
NNitro
$0.002
🗂️ Data & FilesAPI
Repair broken JSON
Turn almost-correct data into data a program accepts: in the example, a record with bare names, single quotes and two leftover commas comes back clean, with the…
NNitro
$0.003
🗂️ Data & FilesAPI
Fuzzy dedupe
Find duplicates that are not spelled the same: "Jon Smith, 4 Oak St" and "Jonathan Smith, 4 Oak Street" are recognised as one person, the way a careful reviewer…
NNitro
$0.002
🗂️ Data & FilesAPI
Normalize names & addresses
Turn «Robert Chen» and «CHEN, ROB» into records you can actually match: names get consistent capitalization and order, and street words like Apt or Apartment…
NNitro
$0.003
✅ ValidationAPI
Verify an email exists
Three checks in one before you send: the address is well formed, its domain exists, and that domain has mail servers ready to accept messages.
NNitro
$0.002
✅ ValidationAPI
Spot throwaway emails
Stop one person from opening dozens of accounts with throwaway inboxes: an address at mailinator.com is flagged as disposable the moment it is entered, because…
NNitro
$0.002
✅ ValidationAPI
Clean your email list
Find the dead addresses in your own list before a campaign bounces: check up to 500 at once and each one comes back as deliverable, undeliverable, risky or…
NNitro
$0.002
✅ ValidationAPI
Look up a phone carrier
Send +34600111222 and it comes back unchanged with a plain note: naming the carrier needs a licensed operator database, so no guessed carrier is returned.
NNitro
$0.002
✅ ValidationAPI
Check an EU VAT number
Enter ESB12345678 and it comes back well formed, with Spain read from its ES prefix. A missing digit, a wrong prefix or a made-up string is caught before your…
NNitro
$0.002
✅ ValidationAPI
Locate an IP address
Enter an IP and get the country its block is registered in, plus the network holding it, its address range and allocation type.
NNitro
$0.002
✅ ValidationAPI
Detect VPN and proxy
Check one IP and learn whether it sits in a datacenter or hosting range instead of a home or mobile connection, the infrastructure most commercial VPNs, proxies…
NNitro
$0.002
✅ ValidationAPI
Score bot traffic
Tell scripted traffic from real visitors without a puzzle for everyone: a request sent by the curl command-line tool scores 60 and is marked as likely…
NNitro
$0.002
✅ ValidationAPI
Screen a link for danger
Paste https://bit.ly/3xYz and it is flagged as suspicious, because a shortener hides where the link really goes.
NNitro
$0.002
✅ ValidationAPI
Detect phishing
Paste a message that says your account will close today unless you log in, and you get a risk score plus the exact signals found: urgency, a borrowed brand…
NNitro
$0.003
✅ ValidationAPI
Validate a postal address
A single missing apartment number is enough to send a package to the wrong door: this check splits a typed address into its parts, fixes common typos and…
NNitro
$0.003
⚙️ Developer UtilitiesAPI
Schedule a webhook
Have a URL of yours called on a cron schedule, for a nightly report, a renewal check or a cache warm-up, without keeping a server or container alive just to…
NNitro
$0.002
⚙️ Developer UtilitiesAPI
Schedule a delayed callback
Have your URL called after a wait you choose, from a few seconds up to 30 days: a reminder 24 hours before a trial ends, or an unpaid invoice cancelled after 30…
NNitro
$0.002
🕸️ Web Scraping & MonitoringAPI
Shorten a link
Turn a long address full of parameters into a short link that fits a flyer, a QR code or a referral email, and give each campaign channel its own link so you…
NNitro
$0.002
🕸️ Web Scraping & MonitoringAPI
Track link clicks
Find out whether a short link worked: you get its total clicks over the last 1 to 90 days, its creation date and its destination, without tracking who clicked.
NNitro
$0.002
🖼️ ImagesAPI
Edit a QR after printing
Print a QR code once and change where it leads as often as you need: the printed pattern never changes, only the destination behind it does.
NNitro
$0.002
🖼️ ImagesAPI
Read a barcode from a photo
Read the number in an EAN, UPC or Code128 barcode from an ordinary phone photo, even of a dented can, and get its format too.
NNitro
$0.002
⚙️ Developer UtilitiesAPI
Generate a regex
Describe what you need to match, such as a phone number in three formats or a log line with a timestamp and a severity, and get the regular expression plus the…
NNitro
$0.003
⚙️ Developer UtilitiesAPI
Explain a regex
Paste a regular expression you inherited and get a plain-language walk-through of each piece: what every group captures, what each anchor requires and what each…
NNitro
$0.003
⚙️ Developer UtilitiesAPI
Explain code
Paste a function you did not write and read what it actually does today, not what its name suggests: the logic it follows, how it handles errors, its side…
NNitro
$0.003
⚙️ Developer UtilitiesAPI
Document your code
Send a source file and get it back with a docstring above every function, in a style your tools read, such as Google, NumPy, JSDoc or PHPDoc.
NNitro
$0.003
⚙️ Developer UtilitiesAPI
Turn a question into SQL
Ask which customers had two or more refunds this quarter and get a runnable query built only from the tables and columns you supply, plus a short note on what…
NNitro
$0.003
🗂️ Data & FilesAPI
Generate a JSON Schema
Turn real examples of your data into a ready set of validation rules: give two samples, one with an optional value and one without, and that value comes out…
NNitro
$0.003
⚙️ Developer UtilitiesAPI
Generate unit tests
A suite can reach 90% line coverage and still never try an empty list: send your function and its framework, such as Jest or PyTest, and get a runnable test…
NNitro
$0.003
⚙️ Developer UtilitiesAPI
Write a commit message
Paste a diff and get a commit message written from what actually changed, such as fix(auth): handle expired refresh tokens, with the type and scope picked for…
NNitro
$0.003
⚙️ Developer UtilitiesAPI
Generate a README
Get a README drafted from the code you actually shipped: the generator reads the folder layout, dependency files, build and test scripts and license, then…
NNitro
$0.003
🕸️ Web Scraping & MonitoringAPI
Run hundreds of HTTP requests
Hand over a list of up to 100 web calls, each with its own address, method, headers and body, and they run side by side with their own retries.
NNitro
$0.002
✍️ Text & AIAPI
Generate placeholder text
Get placeholder text that is about your topic instead of Latin: a mockup for a veterinary clinic reads like a veterinary clinic, from a single headline to a…
NNitro
$0.003
🔍 Semantic Search & RAGAPI
Get text embeddings
Turn text into numbers that capture its meaning, so 'cancel my plan' sits next to 'terminate subscription' even though they share no words.
NNitro
$0.002
🔍 Semantic Search & RAGAPI
Embed a whole corpus
Vectorize ten thousand product descriptions in one submission instead of ten thousand separate calls: you send the whole list, track one job and collect every…
NNitro
$0.002
🔍 Semantic Search & RAGAPI
Index your text
Skip the four decisions a vector database demands, from how to split text to where to host the index: send your wiki pages, help articles or notes and get an…
NNitro
$0.002
🔍 Semantic Search & RAGAPI
Index PDFs and scans
Find 'the clause about early termination' without knowing which contract holds it: your PDFs, scanned pages included, are read page by page and turned into an…
NNitro
$0.010
🔍 Semantic Search & RAGAPI
Index a website
Someone asking 'how do I change my billing cycle' should find the page titled 'subscription management': give one starting address, the crawl follows the links…
NNitro
$0.040
🔍 Semantic Search & RAGAPI
Search by meaning
Someone who types 'forgot my password' finds the article titled 'resetting your access credentials': results are ranked by closeness of meaning, not by shared…
NNitro
$0.002

How it works

1

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.

Pay only for what you use

No subscription. Free tools run in your browser; paid tasks draw from your balance, which never expires.

Free tools
$0.00

On-device utilities — hash, QR, JSON, Text→PDF and more — run in your browser. No account, no limits.

Balance
$10.00+

Top up your balance and spend it across web, API and the app. It never expires.