Free online tools
Email, social media, network, developer and security utilities from HstockPlus Tools.
Popular tools
Frequently used utilities with direct links.
SMTP Tester
Test SMTP connectivity, banner response and STARTTLS support.
Instagram Account Checker
Check Instagram username status and basic public profile details.
Facebook Account Checker
Check whether public Facebook profiles appear available by UID.
DNS Lookup
Look up common DNS records for a public domain.
Gmail Email Validator
Check Gmail address status in small batches.
Password Generator
Generate strong random passwords with configurable options.
All tools
Browse by category or filter the complete list.
Validate addresses, inspect mail routing, test SMTP connectivity and analyze headers with focused email utilities.
Gmail Email Validator
Free
Check Gmail address status in small batches.
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Microsoft Outlook Mail Reader
Free
Read Microsoft mailbox messages with OAuth credentials you provide.
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SMTP Tester
Free
Test SMTP connectivity, banner response and STARTTLS support.
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MX Lookup
Free
Find the mail exchange servers configured for a domain.
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Email Header Analyzer
Free
Inspect routing and authentication details in raw email headers.
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Network
Check domains, public IPs, TCP connectivity, HTTP response headers and SSL certificates.
DNS Lookup
Free
Look up common DNS records for a public domain.
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What Is My IP
Free
Show your public IP address.
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IP Lookup
Free
Resolve hostnames and inspect basic information for public IPs.
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Port Checker
Free
Check whether a public TCP port appears reachable.
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HTTP Header Checker
Free
Inspect HTTP response headers for a public URL.
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SSL Certificate Checker
Free
Check public SSL/TLS certificate issuer and expiration details.
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Developer
Format, convert, parse and clean common web and text data directly in the browser.
JSON Formatter & Validator
Free
Format, minify and validate JSON locally in your browser.
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URL Encoder / Decoder
Free
Encode and decode URL-safe strings locally in your browser.
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Unix Timestamp Converter
Free
Convert between Unix epoch time and readable dates.
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User-Agent Parser
Free
Parse browser, OS and device hints from a User-Agent string.
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Cookie Converter
Free
Convert cookie data between common header, JSON and Netscape formats.
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Text Processor
Free
Clean, sort, deduplicate and transform text locally.
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Text to Table Converter
Free
Convert delimited text into a table, CSV or TSV.
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Private Browser Notes
Free
Keep lightweight notes locally in your browser.
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Security
Generate passwords and random strings, check password strength, create hashes and generate TOTP codes locally.
Password Generator
Free
Generate strong random passwords with configurable options.
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Password Strength Checker
Free
Estimate password strength locally in your browser.
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SHA Hash Generator
Free
Generate SHA-1, SHA-256 and SHA-512 hashes locally.
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Random String Generator
Free
Generate configurable random strings locally in your browser.
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Online 2FA Code Generator
Free
Generate 2FA verification codes locally from secrets.
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Social Media
Free public-profile checkers and clearly labeled Premium research workflows for Instagram, Facebook, TikTok, Threads and X.