Tools for troubleshooting, networking, encoding and developer work. They run on this site. Further down, a few larger services are linked externally because they need their own infrastructure.
Encode or decode Base64 text (UTF-8 safe). Runs entirely in your browser.
Open tool →Generate SHA-1, SHA-256, SHA-384 or SHA-512 hashes of text. Computed locally in your browser.
Open tool →Generate random version 4 UUIDs, one or many at a time.
Open tool →Convert Unix timestamps (seconds or milliseconds) to dates, or a date to a timestamp. Leave blank for now.
Open tool →Decode a JSON Web Token to see its header and payload, and whether it has expired. The signature is not verified. Avoid pasting live production tokens into any online tool.
Open tool →IPv4 subnet calculator: network, broadcast, mask, wildcard and usable host range from CIDR notation.
Open tool →Validate, pretty-print or minify JSON.
Open tool →Generate strong random passwords or passphrases using the browser's cryptographic random number generator. Nothing is sent anywhere.
Open tool →Test a regular expression against sample text and list every match with its position and capture groups.
Open tool →Percent-encode or decode URL components.
Open tool →Look up DNS records for a domain using Cloudflare's public DNS-over-HTTPS resolver, queried directly from your browser.
Open tool →Shows the public IP address your browser connects from, using the ipify API.
Open tool →DNS, MX, SMTP, blacklist and DMARC checks.
Open →DNS propagation across many global resolvers.
Open →IP, ASN and routing lookups.
Open →Dig, MX checks and email header analysis.
Open →Test Exchange, Outlook and Microsoft 365 connectivity.
Open →Grades a site's TLS configuration.
Open →Checks which HTTP security headers a website sends.
Open →Broader website security scan with a graded report.
Open →Check whether an email address appears in known data breaches.
Open →Run Microsoft Graph calls against your own tenant.
Open →Internet traffic, trends and outage data.
Open →Explains cron schedules in plain English.
Open →Measure download, upload and latency.
Open →Quick, minimal download speed test.
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