About IsThisValid.com

IsThisValid.com is a free verification hub. Whether you've received a suspicious text, want to check a sketchy link before clicking it, need to validate an email address, or want to know if a photo is AI-generated, we have a tool for it — no account, no sign-up, no personal data stored.

All six tools are accessible directly in your browser; submitted data is processed server-side and never permanently stored. The QR code scanner runs entirely client-side and never uploads images or camera frames anywhere.

1. Phone Number Checker — validates any phone number against ITU-T rules using libphonenumber-js, identifies the country, line type (mobile, landline, VoIP, toll-free, etc.), and (optionally) enriches results with live carrier and line-status data via the AbstractAPI. Try it →
2. Text / SMS Scam Detector — paste any suspicious message and our AI (powered by Anthropic Claude) analyses it for scam, smishing, spam, and social-engineering patterns. It flags specific phrases and explains its reasoning. Try it →
3. Email Validator — checks whether an email address passes RFC 5322 syntax rules, belongs to a known disposable-email provider (57,000+ domains), has valid DNS MX records, and (optionally) whether the mailbox actually exists. Results are scored 0–100. Try it →
4. URL Safety Checker — checks URLs for phishing signals, suspicious keywords, brand-squatting, punycode tricks, IP addresses masquerading as domains, URL shorteners, and known malware/phishing lists via the Google Safe Browsing API. Try it →
5. Image Authenticity Checker — upload a photo or screenshot and our AI vision model (via the SightEngine API) estimates the likelihood it's AI-generated or synthetic. Try it →
6. QR Code Scanner — decode a QR code from an uploaded image or your camera, entirely in your browser. If it points to a URL, we run it through the URL Safety Checker before you scan it; other content (Wi-Fi, phone numbers, email addresses) is shown to you safely without auto-connecting. Try it →

Scams are getting harder to spot. Smishing texts impersonate banks and couriers convincingly. Phishing URLs differ from the real thing by a single character. Disposable email addresses pollute sign-up flows. None of these problems require expensive software to catch — they just need a quick, reliable check.

IsThisValid.com is deliberately simple. No logins, no dashboards, no plans to upsell you into a SaaS tier. Just paste, check, done.

Phone Number Checker — validation runs locally first using libphonenumber-js (no network calls). If an AbstractAPI key is configured, we enrich the result with live carrier name, line type, ported status, and line-active confirmation. Phone numbers are never stored — only their SHA-256 hash is cached for up to 30 days as a cache key.

Text / SMS Scam Detector — your message is sent to our server and forwarded to Anthropic's Claude API with a strict system prompt that instructs the model to classify the message and extract specific red flags. The output is validated against a schema before being returned to you. Results are cached for 24 hours (by a one-way hash of the message) to avoid redundant AI calls for the same viral scam text.

Email Validator — validation runs in two layers: local checks (syntax, TLD, disposable domain list, MX DNS) happen in milliseconds with no third-party calls. If a ZeroBounce or Emailable API key is configured, we also perform an SMTP-level handshake to verify mailbox reachability.

URL Safety Checker — nine local heuristics run first (no network calls, instant). If the URL passes, we make a HEAD request to check reachability, then query the Google Safe Browsing API against its threat database.

Image Authenticity Checker — the image you upload is sent to our server and forwarded to the SightEngine API, which returns a probability that the image is AI-generated. We never store the image itself — only a SHA-256 hash of the bytes is cached for up to 24 hours to avoid redundant calls for identical images.

QR Code Scanner — the image or camera frame is decoded entirely in your browser using client-side JavaScript; nothing is uploaded to our server. If the decoded content is a URL, that URL text (not the image) is sent to our URL Safety Checker as described above.

None of the content you submit — email addresses, URLs, text messages, phone numbers, or images — is permanently stored on our servers. Text messages submitted to the scam detector are forwarded to Anthropic for analysis, and images are forwarded to SightEngine for analysis; a one-way cryptographic hash may be cached briefly to avoid duplicate calls. QR content is decoded entirely in your browser and never uploaded. For full details, see our Privacy Policy.

IsThisValid.com is completely free to use — no account, no limits, no catch. Running AI analysis and third-party API calls costs real money, so if you find the tools useful, a ☕ via Ko-fi goes a long way. We may also display contextual advertisements in the future to help cover costs. Advertising never affects our results — we have no commercial relationship with any service we check against, and no financial incentive to report a result as safe or unsafe.

IsThisValid.com was designed and built by Mike Sywensky, a full-stack developer and engineering manager with over 10 years of experience in Pharma and over six in Finance. If you're looking for a contractor for your next project, feel free to reach out.

Questions, feedback, or bug reports about the tools? Reach us at [email protected].