Technical utilities, without the bullshit
Fast technical tools. Real results.
Paste something, get an answer. DNS, HTTP, SSL, email and developer utilities built to be fast, accurate and free of signup friction.
No accounts for basic lookups. No AI where a parser will do.
Principles
How FKINFAST is built
Built for speed
Server-rendered pages, minimal JavaScript and no third-party bloat on the critical path.
Deterministic by default
DNS, HTTP and TLS checks use real protocol clients and parsers, never an LLM in the execution path.
Results you can trust
Findings are PASS, WARNING, FAIL or UNKNOWN, with plain explanations instead of false confidence.
The toolkit
Free tools, online now
Browser-local utilities run entirely on your device and never send your input to a server. Remote diagnostics send only the domain or URL you enter.
DNS Lookup
LiveResolve A, AAAA, CAA, CNAME, MX, NS, SOA and TXT records.
Open toolMX Lookup
LiveFind the mail servers responsible for a domain.
Open toolSPF Checker
LiveValidate SPF records and spot common mistakes.
Open toolDMARC Checker
LiveCheck DMARC policy and alignment configuration.
Open toolSSL Checker
LiveInspect certificate validity, issuer and expiry.
Open toolHTTP Status Checker
LiveCheck status codes, redirects and response time.
Open toolRedirect Checker
LiveFollow redirect chains and find loops.
Open toolRobots.txt Checker
LiveFetch and validate robots.txt rules.
Open toolSitemap Checker
LiveVerify sitemap availability and structure.
Open toolJSON Formatter & Validator
LiveFormat, validate and minify JSON locally in the browser.
Open toolBase64 Encoder & Decoder
LiveEncode text to Base64 or decode Base64 back to text, including base64url.
Open toolURL Encoder & Decoder
LivePercent-encode or decode URLs, query values and form data.
Open toolUUID Generator (v4)
LiveGenerate cryptographically random version 4 UUIDs, one or in batches.
Open toolUnix Timestamp Converter
LiveConvert Unix timestamps to dates and dates back to epoch seconds or milliseconds.
Open tool
Support the project
The FKINFAST tools are free and ad-free. If they saved you time, a one-off tip covers servers, domains and the time spent building new tools.