Free tools for IT, networks and everyday tech.

Share text, passwords, screenshots and files between two computers with a private link. Encrypted, and wiped after 48 hours.

See the 100+ details your browser gives away, and test whether websites can recognise you across private windows and VPNs without cookies.

How long would your password take to crack today, and with future GPUs, AI data centres and quantum computers? See what gives it away and check it against data breaches, privately.

Check a website or mail server's certificate: expiry, issuer, names covered, chain and trust, key strength, TLS 1.0 to 1.3 support and CAA records.

MD5, SHA-1, SHA-2, SHA-3 and CRC32 hashes of text or files, checksum verification, HMAC signatures, and bcrypt password hashes for PHP and .htpasswd.

Work through the 2026 Danzell question set, see exactly which answers would fail (including the new automatic fails), and keep an evidence log book you can save, share and print.

Get ready for the Cyber Essentials Plus audit: every self-assessment question plus the seven technical tests the assessor runs, with what to check before they arrive.

A 27-area audit well beyond Cyber Essentials: AI tools and agents, Microsoft 365 and Google integrations, deepfake and phishing-kit attacks, cloud servers with weekly testing, pen testing, backups and incident response.

Test everyday computer, Microsoft 365, Word, Excel, Outlook and online safety skills. Marked instantly with explanations and a printable, verifiable result.

Check a domain's SPF, DKIM and DMARC setup, plus MTA-STS, TLS reporting and BIMI, against Google, Microsoft and NCSC requirements, with the records to fix it.

Paste an email's headers to trace the servers it passed through, check SPF, DKIM and DMARC, decode spam filter verdicts and spot spoofed or hijacked senders.

Look up any DNS record, compare answers across six public resolvers and the authoritative servers, trace a lookup from the root and check DNSSEC.

Who a domain is registered with, when it was registered and when it expires, its status locks, nameservers and where it's hosted. Works for .com, .co.uk and most other endings.

Your real download and upload speed, plus how much lag builds up when the line is busy and what that does to video calls, gaming and phone calls.

Watch your connection for 1 to 10 minutes to catch lag spikes, jitter and dropouts, then see whether it's good enough for gaming, calls and streaming.

Your public IP address, who your internet provider is, your reverse DNS and what your browser reveals about you.

Check whether your internet provider or VPN is leaking your real IP through WebRTC, or blocking websites on your connection.

See which DNS servers really answer your lookups, so you can tell if your VPN or private DNS is leaking.

Ping any website, server or IP from our UK server to check it's up and measure latency, jitter and loss, or test a TCP port when ping is blocked.

See every router between our UK server and any website or IP, who runs each network and where delay builds up. Trace back to your own connection too.

IPv4 and IPv6 subnets: network, usable range, broadcast and masks with a binary view, plus a subnet splitter, VLSM planner and route summariser.

See any website's redirect chain and response headers, with a security header grade, cookie and caching checks, certificate expiry and HTTP/2 support.

Will a cable run carry the speed and PoE power you need? Check Cat5e to Cat8 against 1 to 40 Gbps, work out voltage drop and power loss, and find the longest run that works.

The right power cable for AC, DC, 12V, solar and three-phase runs: voltage drop rated from excellent to unacceptable, current capacity, cable temperature and fuse size.

Convert between AWG, mm², SWG and kcmil, and measure a cable with calipers, solid or stranded, to find its true size and spot undersized cable.

Random v4 and time-ordered v7 UUIDs (GUIDs), plus v1, v6, v3 and v5, one at a time or up to 10,000 at once. Decode any UUID to see its version and time.

API keys, JWT and session secrets, Laravel, Django and WordPress keys, AES keys, 2FA secrets with QR codes, recovery codes, and SSH, WireGuard and signing key pairs.

Format, minify and validate JSON with exact error locations and plain-English fixes, one-click repair, sorted keys, a tree view and big numbers kept exact.

Encode text and files to Base64, or decode Base64 back to text, images or files. URL-safe, MIME and data URIs, with file type detection and JWT decoding.

Convert Unix timestamps in seconds, milliseconds or nanoseconds to dates in any time zone and back, plus Excel, Windows and .NET times and whole log files.

Strong random passwords, easy-to-type passphrases, pronounceable passwords and PINs, made in your browser, with their strength and crack time.

QR codes for links, Wi-Fi, contacts and more, in your own colours, as PNG or SVG.

Create a Bitcoin address and private key offline in your browser and print them as a paper wallet with QR codes.

How big a proper 3-2-1 backup with versions really is, the NAS and drives to hold it, cloud storage costs, and whether your internet can upload, keep up and restore in time.

How long a file, game, film or backup takes to download or upload at your speed, compared across UK connections, and the speed you need to hit a deadline.