Developer Utilities
Fast, private, no upload required. Everything below runs entirely in your browser.
OSINT & Lookup
Phone Lookup
Carrier, line type, VoIP detection for any number.
Email Lookup
MX, disposable detection, provider, risk score.
DNS Lookup
A, MX, TXT, CAA, DNSSEC — all record types.
What's My IP
Public IP, ISP, ASN, country. Never stored.
Encoding & Decoding
Base64 Encoder / Decoder
Encode or decode Base64. Auto-detects direction.
URL Encoder / Decoder
Percent-encode or decode URI components.
HTML Entity Encoder
Encode special chars or decode entities back to text.
Format & Validate
JSON Formatter
Pretty-print, minify, validate. Pinpoints errors.
Regex Tester
Live match highlighting, capture groups, replace mode.
Text Diff Checker
Compare two texts line by line. Additions and removals, color-coded.
Security & Crypto
JWT Decoder
Decode header + payload, with claim explanations.
Hash Generator
MD5, SHA-1, SHA-256, SHA-384, SHA-512 — all at once.
Hash Identifier
What algorithm made this hash? Paste it, find out.
Password Strength
Entropy + crack-time, computed entirely in your browser.
UUID Generator
Random v4 UUIDs. Bulk mode, copy or download.
HTTP & Network
HTTP Header Analyzer
Paste response headers, get a security grade plus per-header explanation.
HTTP Request Inspector
See what your browser is sending right now: headers, user agent, JS state.
User-Agent Parser
Break a UA string into browser, OS, device, and bot or automation signals.
How This Page Reached You
A live walk through DNS, TLS, and timing of your own connection to this site.
Browser & Device Benchmark
Lightweight: JS compute speed, frame rate, real server latency, and your network estimate. Nothing downloaded in bulk.
Subnet Calculator
CIDR to network, mask, host range. IPv4 + IPv6.
Date & Time
Guides