WebChecks

Free tools for IT pros.

56 web tools for domains, DNS, email, certificates, networking, and web design, plus Windows software.

no sign-up no upsells sensitive tools run locally

Or paste a domain, IP, email, or MAC address.

Passwords

02
Password Generator Strong random passwords, generated locally in your browser. runs locally
One-Time Secret Sharing Share a password or key that self-destructs after one view — encrypted in your browser.

Domains & DNS

04
Domain Check SPF, DKIM, DMARC, TLS, headers, WHOIS — a full health report for any domain. ai-assisted
Domain Footprint Inventory every third-party service attached to a domain via public DNS. ai-assisted
DNS Propagation Check See how a DNS change is resolving around the world right now.
Tech Stack Check See the web server, CMS, and language a site runs, and whether each is still supported.

Internet/WWW

04
What Is My IP? Your public IPv4 and IPv6 addresses, at a glance.
Speed Test Measure your download, upload, and latency.
IP Owner Lookup Find the network and organization behind any IP address.
Website Down Checker See if a site is down for everyone, or just you — checked from multiple regions.

Email

10

SPF/DKIM/DMARC

SPF Checker Mechanism breakdown, full resolution tree, and the 10-lookup limit.
DKIM Checker Look up a key by selector name: resolution path, tags, and revoked-vs-broken status.
DMARC Checker Full tag table, policy findings, and reporting guidance.
DMARC Report Viewer Turn raw DMARC XML reports into something readable. runs locally

Deliverability

Email Deliverability Test Find out whether your mail will land in the inbox — and why.
Email Header Analyzer Paste raw headers and trace a message's full delivery path. beta
SMTP Test Connect to a mail server and watch the live SMTP/STARTTLS handshake as it happens.
Why Did This Email Fail? Translate a bounce message into plain English and next steps. ai-assisted
Blacklist Check See if your domain or IP is listed on major spam blocklists.

Other

SafeLinks Decoder Turn a rewritten email link back into the URL it points at. beta runs locally

Microsoft 365 & Azure

09

Licensing & Lifecycle

365 License Lookup Which Microsoft 365 license includes a feature — and what you gain or lose switching.
Microsoft Lifecycle Lookup Support and servicing dates for the full Microsoft product catalog.
365 Roadmap Tracker What Microsoft changed on the roadmap — slipped dates, status moves, new and withdrawn items. beta

Azure

Azure VM Size Decoder Break down an Azure VM size name segment by segment, with live pricing. beta

Identity & Security

Graph Permissions Finder Least-privileged Microsoft Graph permissions for what you're actually trying to do. beta runs locally
Microsoft Tenant Lookup Identify the Microsoft 365 tenant behind a domain — ID, org name, cloud and sign-in mode. beta

Admin & Scripting

Microsoft Portals A filterable directory of every Microsoft admin, end-user and developer portal.
M365 PowerShell Setup Install PowerShell and the M365 admin modules, then connect to each service.
PowerShell Commands Search a module-grouped library of common Microsoft 365 admin and BEC-triage commands.

Certificates

03
Certificate Format Converter Convert between PEM, DER, PKCS#7/PKCS#12 (PFX) formats — your private key never leaves your browser. runs locally
CSR Generator & Decoder Generate a CSR and private key, or decode an existing one — the key never leaves your browser. runs locally
SSL Cert Check Inspect a site's certificate chain, expiry, trust status, and post-quantum readiness.

Networking

07

Physical/Logical

Subnet Calculator IPv4/IPv6 subnet math, splitting, range-to-CIDR, and aggregation.
MAC Address Lookup Identify the hardware vendor from a MAC address.
Port Number Lookup Look up what service a port number is registered to, or search by name.
Open Port Check Test whether a port on your network is reachable from outside.

Transmission

Data Storage Unit Converter Convert between bits, bytes, and transfer rates — decimal and binary. beta runs locally
File Transfer Time Calculator Estimate how long a transfer will take — or the speed you need to hit a deadline. beta runs locally

Other

User Agent Parser Decode a user-agent string into browser, OS, device, and engine — one or many at a time. runs locally

Security

04
Security Headers Check Grade a site's security headers and get specific fixes.
Security.txt Checker Validate a domain's RFC 9116 vulnerability disclosure file.
JWT Decoder Decode a JWT and read its claims — with Entra ID roles and app IDs resolved to names. beta runs locally
AAGUID Lookup Identify a passkey authenticator from its AAGUID.

Command Line

01
Cron Builder & Explainer Build or paste a cron expression and see a plain-English schedule, next 10 runs, and DST warnings. runs locally

AI

01
AI Access Check See which AI crawlers your robots.txt actually allows, blocks, or misses.

MSP

01
Vendor Status Dashboard Live status for the PSA/RMM, security, and backup vendors MSPs run every day. beta

Web Design

05
HTML Preview Paste HTML and see how it renders. runs locally
Visual HTML Editor Format text visually and copy the HTML. runs locally
SEO Basics Check Audit a page's titles, meta tags, and indexability.
Emoji Search Find the exact emoji, fast.
Hex Color Inspector Inspect any color's values, contrast, and variations.

File Tools

02
PDF Splitter Extract pages, split by range, or break a PDF into individual files, right in your browser. runs locally
PDF Merger Combine, reorder, and trim PDFs into one file, right in your browser. runs locally

Image Tools

01
Image Converter Convert images between formats, right in your browser. runs locally

Other Tools

02
QR Code Generator Turn text or a URL into a QR code, live, entirely in your browser. runs locally
Area Code Lookup Find where a North American area code is and read your clock beside theirs, live. beta runs locally