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Online diagnostics in your browser

Network tools
for developers.

32 fast, accurate utilities for IP lookup, DNS diagnostics, security checks and data conversion. Free to use, no signup required.

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45 Free tools
8 Languages
0 Signups required
EU GDPR-aligned

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Every tool you need, grouped by job.

Forty-five focused utilities across IP & network, DNS & domain, security and developer workflows. Free, instant, in-browser.

IP & Network 14 tools

Diagnose connections, trace routes, look up ownership and reachability of any IP or host.

IP Whois Popular
Owner, ASN, and allocation details for IPv4 or IPv6.
Ping
Measure round-trip latency to any host or IP, live.
Traceroute New
Trace the network path to any host, hop by hop.
Port Checker
Test TCP port availability for any host, single or batch.
IP Geolocation
Look up city, country, ASN, and coordinates for any IP address.
Privacy Check
Detect VPN, proxy or Tor exit nodes for any IP address.
Spam DB Check
Scan IP against 15+ DNSBL blacklists in parallel.
MAC Vendor Lookup
Identify hardware manufacturer from a MAC address prefix.
See all 14 →

Domain & DNS 7 tools

Inspect domains, records, and propagation. Everything you need before and after a DNS change.

DNS Lookup Popular
Query A, AAAA, MX, TXT, NS, CNAME and SOA records.
DNS Propagation
Check record status across 15 DNS servers worldwide.
DNS Response Time
Benchmark resolver speed across multiple providers.
Domain Whois
Registration details, nameservers, and expiry.
Domain Availability
Check if a domain name is registered or free.
Hosting Provider
Identify the hosting or cloud provider of any site.
Site Info
Title, description, stack, and tech used on any site.

Security checks 4 tools

Audit TLS, headers, and origin info — the basics you want to verify before shipping.

SSL Checker New
Inspect certificate chain, expiry and algorithm for any site.
HTTP Headers New
View response headers and audit security policies.
Password Generator
Generate strong passwords with configurable rules.
Text Encryption
AES encryption plus classic ciphers (Caesar, Vigenère).

Encoders & utilities 20 tools

Converters, calculators, and code utilities used every day by developers.

Base64 Encoder Popular
Encode and decode text or binary data to Base64.
JSON Formatter Popular
Validate, format, and minify JSON with syntax highlighting.
JWT Decoder New
Decode JWT header and payload safely in-browser.
QR Code Generator New
Create QR codes with custom size, color, and error correction.
Chmod Calculator
Convert between numeric and symbolic UNIX permissions.
Punycode Converter
Convert internationalized domain names (IDN ↔ ASCII).
Case Converter
Convert between UPPER, lower, Title, camelCase, snake_case.
Download Time
Estimate download duration at any connection speed.
See all 20 →

Common questions

Are all the tools really free?
Yes — every tool on checkbox.tools is free with no paid tier. We cover hosting from non-intrusive Google AdSense ads on a few pages. No signups, no trial limits, no upsells.

Do you store my queries or my IP address?
We log a hashed (salted SHA-256) IP plus the tool slug and timestamp for rate-limiting and abuse defence — never the raw IP, never the queried domain or IP. Aggregated logs are deleted after 30 days.

Why pick checkbox.tools over 2ip.ua or MX Toolbox?
We combine 45 tools in eight languages on one tab, with a privacy-first stance (no signup, no third-party trackers beyond AdSense), modern UI, and copy-pastable raw output. Try a tool side-by-side — you will feel the speed difference.

Where do the network probes run from?
Live network checks (ping, traceroute, port checker, DNS lookups, SSL inspection) run from our Hetzner server in Frankfurt, Germany. Geolocation latency therefore reflects "from European data centre", not from your home connection.

How accurate is the IP geolocation?
City accuracy varies from 50% to 80% depending on country; country accuracy is > 99%. We use a local geolocation database refreshed monthly, with no live external API calls. For mobile IPs the city is often the carrier hub, not the device.

Can I use these tools in my own commercial workflow?
Yes — there is no separate commercial licence required. Use them in your day job, in client work, or in your own SaaS investigations. We only ask that you do not automate scraping at machine speeds (rate limits apply per IP).

Is there an API or a command-line version?
Not today. checkbox.tools is a browser-first project — the goal is one tab, no setup. If you need an API, ping us with your use case via the Contact page; we are tracking demand and may open one for popular tools later.

Why no user accounts?
Accounts add complexity, attract spam and create a data-protection liability — none of which improves the tools. Everything you need is one click away without signing up. If you want to save results, just copy or download them.