Diagnose domains and sites
Check DNS, email health and web status before setting up monitoring.
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Search practical tools for IP, DNS, PDFs, QR codes, JSON, images, invoices, time zones and website checks. Open the free tool directly, no account required.
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Start with a direct tool page. The cards below filter as you type or choose a category.
What is my IP
See the public IP observed by the service without signing in.
Open toolDNS Propagation
Check DNS values and compare them with an expected answer.
Open toolLoan Payment
Estimate a payment, total interest and scenario range in the browser.
Open toolJSON Formatter
Format, validate and inspect structured data locally.
Open toolTime Zone Converter
Translate a meeting time across cities and zones.
Open toolStatic QR
Create a static QR code preview for a public-safe payload.
Open toolInvoice Builder
Draft a basic invoice and prepare a browser-side document.
Open toolSPF Checker
Inspect a domain SPF record and understand the next fix.
Open toolWebsite Status
Check whether a site is reachable and see the first status details.
Open toolImage Compressor
Compress an image locally and compare output basics.
Open toolPDF Merge
Combine PDFs with a simple browser-first tool.
Open toolChoose by task
Create client documents
Draft invoices, quotes, receipts and PDFs with browser-first tools.
Prepare launch assets
Generate QR links, optimize images and keep conversion assets tidy.
Plan operations
Model business numbers, schedule across time zones and inspect developer snippets.
Original guidance
Understand the result and choose the next step
Reviewed guides connect diagnosis, limitations, primary sources and free tools so you can verify your own case.
DNS and domains
DNS propagation troubleshooting: a decision-first workflow
Learn how to separate a real DNS change from cache, delegation and local resolver problems without repeatedly changing records.
Read the guideEmail authentication
SPF, DKIM and DMARC: a rollout checklist that protects legitimate mail
Map senders, align SPF and DKIM, read DMARC reports and move to enforcement without guessing or breaking valid email.
Read the guideWeb operations
Website launch checklist: verify the public path, not just the homepage
A practical pre-launch sequence for DNS, HTTPS, redirects, crawl controls, sitemaps, metadata, errors and mobile usability.
Read the guideFiles and privacy
Private file processing: decide what should stay in your browser
A practical framework for images and PDFs: classify the file, verify where processing happens, remove metadata and inspect the output.
Read the guideWeb reliability
HTTP redirects and security headers: diagnose the response before changing it
A step-by-step guide to status codes, redirect chains, canonical destinations and browser security headers without guesswork.
Read the guideDeveloper diagnostics
JSON, Base64 and JWT troubleshooting without exposing secrets
Separate syntax, encoding and token problems, inspect data locally and build a safe reproduction before sharing an API failure.
Read the guideQR codes and campaigns
QR code campaign checklist: destination, readability and measurement
Plan a QR code that remains scannable, opens a trustworthy destination and uses campaign parameters without damaging the URL.
Read the guideFiles and performance
Optimize images and PDFs for the web without losing usability
Choose format, dimensions and compression by purpose, then verify quality, accessibility, metadata and download behavior.
Read the guideNetwork sites
Explore focused tool suites
Browse each focused site when you want a fuller tool set around one task family.
Network diagnostics
NetProbe Atlas
IP, DNS, domain and SSL diagnostics for public troubleshooting.
Calculators
CalcHarbor
Financial and business calculators with formulas users can inspect.
Developer utilities
DevUtility Lab
Developer utilities designed to process sensitive snippets locally first.
Time and dates
TimeNexus
Time, date and unit helpers for everyday global coordination.
QR and links
QRRoute
QR, barcode, UTM and link tools with clear abuse controls.
Documents
InvoiceCraft
Invoices, quotes and receipts that work before account creation.
Email deliverability
MailHealth
Email authentication and deliverability checks for safer domains.
Website monitoring
SitePulse Lab
Website status, headers and performance checks for first response.
Images
PixelBatch
Image optimization tools for web and commerce images.
Documents
DocShift
PDF and document utilities with privacy-first processing rules.
Product principles
Free must work
The basic user need is solved without mandatory signup.
Privacy by default
Browser-side processing is preferred when it reduces collection.
Respectful growth
Advanced options stay separate from the free answer and never interrupt the core task.
Community support
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The best support today is practical: share useful tools, report corrections and bookmark the pages you use most.
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