gettoolbox.dev
The tools you need,
ready to use.
A growing collection of open developer tools. No sign-up. No rate limits (at the moment).
Tools
11 availableWebhook Inspector
Inspect, debug and forward incoming webhooks in real time. Get a unique endpoint, stream events via SSE, define custom responses and forward to your local server.
ShowMyIP
Instantly reveal your public IP address with full geolocation, ISP, ASN, hostname and network details. Available as a clean JSON API — no auth, no limits.
Password Generator
Generate cryptographically secure passwords. Customize character sets, exclude confusable chars, measure entropy. Open JSON API included.
Base64 Encoder / Decoder
Encode or decode Base64 in the browser with URL-safe, MIME wrap and per-line options. Output stays editable and copy-ready.
JSON Formatter
Paste raw JSON and get it back pretty-printed with configurable indentation. Runs entirely in the browser. Open JSON API included.
YAML Formatter
Paste raw YAML and get it back properly indented and normalized. Runs entirely in the browser. Open JSON API included.
JWT Decoder
Decode and inspect JWT tokens in the browser. View header, payload and standard claims. Verify HMAC, RSA and EC signatures client-side.
IP Subnet Calculator
Calculate network address, broadcast, host range, and subnet details for any IPv4 CIDR.
SSL Certificate Inspector
Inspect TLS certificates — validity, issuer, SANs, fingerprint and more.
Email Configuration Checker
Verify SPF, DKIM, DMARC, MX, BIMI, MTA-STS, DANE and PTR records for any domain. Get a deliverability grade and actionable fix suggestions.
Blacklist / RBL Checker
Check if an IP address or domain is listed on 27 public email blacklists (Spamhaus, SpamCop, SORBS, URIBL and more). Instant lookup with delisting links.
Developer friendly
Every tool has a JSON API
No SDK, no wrapper. Just a GET request away.