Check a page
What Google, social platforms and browsers read from one URL: snippet, tags, structured data, languages and speed.
Open Graph preview
See how your link will look when shared, generate the tags, and find what is missing.
Google SERP snippet preview
Title and description measured in pixels, the way Google truncates them, plus a review of the whole <head>.
Structured data validator
Reads the JSON-LD on a page and checks what each Google rich result requires.
hreflang checker
Reads the language alternates, visits each one and checks that they all point back to each other.
Core Web Vitals checker
LCP, INP and CLS measured on real Chrome visits, which is what Google uses for ranking.
HTML validator
The W3C validator’s errors and warnings, grouped and explained, for a URL or pasted code.
Crawling and migrations
Make sure Google finds what it should and nothing is lost when the site moves: sitemap, robots, links and redirects.
Redirect checker
The full chain of hops with their status codes, and the cache and security headers explained.
Sitemap checker
How many URLs it declares, whether they are well formed, and a sample of which ones actually respond.
Broken link checker
Every link on a page, checked one by one, with the ones that return 404 or redirect flagged.
robots.txt tester
Which URLs each crawler may fetch, AI bots included, under the actual rules in your file.
Old URLs finder
Every address Internet Archive has seen on your domain: the list you need before migrating.
IndexNow submitter
Tell Bing, Yandex and friends about new or changed pages, without waiting for the crawl.
Lead generation and QR
Links that convert: WhatsApp one tap away, campaigns measured without mistakes, and QR codes with your branding.
QR code generator
Links, Wi-Fi, contact or plain text. Your colours, style and logo, exported to PNG or SVG.
QR code reader
Bring an image or use the camera and we tell you what is inside, opening nothing on its own.
Coordinates from a Google Maps link
Paste the link and pull out latitude, longitude, name, identifiers and the embed code.
WhatsApp link generator
Your number and a ready message: the link, its QR code and the button to paste on your site.
UTM builder
Well-formed campaign links, and the reverse: take any URL apart and strip the tracking from it.
Domain, DNS and email
Whether your domain is about to expire, whether a DNS change has landed, whether your email reaches the inbox, and who runs a site.
SPF, DKIM and DMARC checker
The records that decide whether your email lands in the inbox or in spam, read and explained.
Website technology checker
The CMS, framework, hosting and CDN behind any site, read from its headers and its code.
Domain expiration checker
Expiry date, registrar, status and name servers of any domain, straight from RDAP.
DNS propagation checker
The same record queried on several public resolvers at once, to see who already has the change.
Subdomain finder
The subdomains that appear in public TLS certificates, including the ones nobody remembers.
Domain rank checker
Where a domain sits on the Tranco top one million list, with its recent trend.
Security
Headers that protect your visitors, Google’s blocklists, and passwords that are already out there.
Security headers checker
HSTS, CSP, X-Frame-Options and friends: which ones you have, which are missing and what each protects.
Safe Browsing checker
Query Google’s Safe Browsing list: malware, phishing and unwanted software.
Pwned password checker
Check whether a password appears in known breaches without it ever leaving your browser.
Image and design
Proportions, file weight, and contrast people can actually read.
Aspect ratio calculator
The exact ratio of any size, resizing without distortion, and the CSS ready to paste.
SVG optimizer
Cut an SVG down to size and verify, pixel by pixel, that it still looks the same.
WCAG contrast checker
Contrast ratio, AA and AAA levels, transparency included, and the closest colour that does pass.
Development
Dates, schedules, and what your device and connection tell every server.
What is my screen resolution
Your resolution, your window size, the pixel density and what your browser already knows about you.
Cron expression generator
Build the expression, read it in plain English and check when it will actually run.
Unix timestamp converter
Timestamp to date and back, in every format you will run into, across several time zones at once.
What is my IP
Your public IP address, your carrier, your country and what your connection tells every server.
No tool matches that search. If it is something you repeat by hand every week, tell us: several of these started that way.
Up next
Which tool would help you?
These utilities come out of chores we had to automate on real projects. If there is one you still do by hand every week, tell us.
They run in your browser
What you type never reaches a server of ours, except in the tools that say so: each one explains what leaves, to whom and why, and none of them stores it.
No sign-up, no watermark
No email, no account, no one else’s logo stamped on your material. The file you download is simply yours.
Built to the same standard
Same bar as the software we ship: fast, accessible and free of third-party dependencies.
These fit in a browser tab. The real work does not
A tool solves a one-minute chore. What we do on commission are the ones that eat a whole afternoon every week: two systems that do not talk to each other, a report someone consolidates by hand, a migration that cannot lose rankings, or the internal app that is currently a spreadsheet with fifteen tabs.
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