38 free tools in 7 categories
Tools
Free tools for developers and VPS owners: test ports, DNS, SSL, email and blacklists from Cloudhim’s server, or encode and calculate privately in your browser.
Developer Tools
Format, encode, decode and generate the small things developers handle every day. Everything runs in your browser.
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JSON Formatter & Validator
Pretty-print, minify and validate JSON, with clear error messages that point to the line and column. -
Base64 Encoder & Decoder
Encode text to Base64 and decode it back, with full UTF-8 support and the URL-safe alphabet. -
URL Encoder & Decoder
Percent-encode text for URLs and decode encoded strings, with a breakdown of a URL’s parts and query parameters. -
UUID Generator
Generate random version 4 or time-ordered version 7 UUIDs with your browser’s secure random generator, and inspect any UUID. -
Unix Timestamp Converter
Convert Unix timestamps in seconds, milliseconds, microseconds or nanoseconds to dates in UTC and your time zone, and back. -
Cron Expression Generator
Build a cron schedule from simple choices or check one you have, with a plain-English explanation and the next run times.
Website Diagnostics
Check a website’s DNS records, HTTP and security headers, redirects and SSL certificate.
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DNS Lookup
Look up a domain’s DNS records: A, AAAA, CNAME, MX, NS, TXT, SOA, CAA, SRV and DMARC, or the name behind an IP address. -
HTTP Headers Checker
See the status code and every response header a web address returns, hop by hop, with timings and what each header does. -
Security Headers Checker
Check a site’s HTTPS and security headers (HSTS, Content-Security-Policy, X-Frame-Options and more) and its cookies, with advice on each. -
Redirect Checker
Trace every redirect from a web address to its final page: status codes, where each hop goes, loops and slow chains. -
SSL Certificate Checker
Check a server’s SSL/TLS certificate: who issued it, the names it covers, when it expires, the chain and the TLS version in use.
Network & Email Tools
Check open ports, DNS propagation, email authentication (SPF, DKIM, DMARC), IP blacklists, whether a site is down, and TLS versions.
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Open Port Checker
Check whether a port on your server is reachable from the internet, or scan for databases and admin services that should not be public. -
DNS Propagation Checker
See whether a DNS change has reached 18 public resolvers worldwide, compared with what your domain’s own name servers say. -
Email Deliverability Checker
Check a domain’s mail setup in one go: MX, SPF, DKIM, DMARC, MTA-STS, reverse DNS of the mail servers and a live SMTP test with STARTTLS. -
IP Blacklist Checker
Check whether a server’s IP address is on 15 email and abuse blacklists, with its reverse DNS, network owner and how to get delisted. -
Website Down Checker
Is a site down for everyone or just you? Check it from Cloudhim’s server: DNS, connection, status code, response time and what went wrong. -
TLS Version Checker
See which TLS versions a server accepts (1.0, 1.1, 1.2, 1.3), the cipher for each, and whether it offers HTTP/2, HTTP/3 and HSTS. -
What Is My IP Address
See your public IP address as servers see it, with its reverse DNS name, network (ASN), provider and country.
Infrastructure Tools
Plan networks, servers and storage: subnets, file permissions, uptime targets, bandwidth, RAID and data sizes. Everything runs in your browser.
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Subnet Calculator (IPv4 & IPv6)
Work out the network, broadcast, mask, host range and size of any IPv4 or IPv6 subnet, and split it into smaller ones. -
Chmod Calculator
Convert Linux file permissions between octal (755), symbolic (rwxr-xr-x) and chmod’s u=,g=,o= form, with special bits explained. -
Uptime & SLA Calculator
See how much downtime an availability target allows per day, month and year, turn an outage into a percentage, and combine components. -
Bandwidth & Transfer Time Calculator
Estimate how long a file takes to transfer at a given speed, and convert between monthly traffic and average bandwidth. -
RAID Calculator
Compare usable capacity, fault tolerance and speed for RAID 0, 1, 5, 6, 10, 50 and 60 with any number of disks. -
Data Size Converter
Convert between bytes, KB, MB, GB, TB and KiB, MiB, GiB, TiB, and bits, and see why a 1 TB drive shows as 931 GB.
Website Files
Create the files every website needs at its root: robots.txt, an XML sitemap, llms.txt for AI tools, and favicons with a web app manifest.
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robots.txt Generator
Build a robots.txt file: block admin and search pages, choose which AI crawlers may read your site, add sitemaps, and test any URL against the rules. -
XML Sitemap Generator
Crawl your site and get a sitemap.xml with only the pages search engines should index, plus a list of pages left out and why. Or paste a list of URLs. -
llms.txt Generator
Write an llms.txt file that tells AI assistants what your site is and where its best pages are. Import pages from your site or add them by hand. -
Favicon & Web App Manifest Generator
Turn an image or a letter into favicon.ico, Apple touch and Android icons, a maskable icon and site.webmanifest, with the HTML tags. Made in your browser.
Config Generators
Write server configs without starting from a blank file: Nginx sites, Docker Compose stacks, Supervisor and systemd services, Apache .htaccess files, and .htaccess rules converted to Nginx. Everything runs in your browser.
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Nginx Config Generator
Build a complete Nginx server block for Laravel, WordPress, any PHP app, a static site or a reverse proxy, with HTTPS, redirects and security headers. -
Docker Compose Generator
Generate compose.yaml for a Laravel, WordPress, Node.js or static stack, with MySQL, MariaDB or PostgreSQL, Redis, healthchecks and Caddy HTTPS. -
Supervisor & systemd Generator
Create a Supervisor program or a systemd service for Laravel queue workers, Horizon, Reverb, Node.js or Python apps, with the commands to start it. -
.htaccess to Nginx Converter
Paste an .htaccess file and get the Nginx equivalent: rewrite rules, redirects, HTTPS and www rules, access rules, headers and caching. -
.htaccess Generator
Build an Apache .htaccess file: HTTPS and www redirects, moved pages, WordPress and Laravel rules, security, caching, compression, error pages and password protection.
Server Security Tools
Harden a server step by step: check your SSH config, build firewall rules, write a Content Security Policy, protect a folder with a password and publish a security contact. Everything runs in your browser.
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SSH Config Checker
Paste sshd_config or sshd -T output to find password logins, root login, weak ciphers and other risky settings, with a ready-made fix. -
UFW Firewall Rule Builder
Tick the services your server runs and get ufw commands in a safe order, with SSH first, private databases locked to one IP and no lockouts. -
Content Security Policy Generator
Build a Content-Security-Policy header from the services your site uses, check it for weaknesses and copy it for Nginx, Apache or a meta tag. -
htpasswd Generator
Create password lines for Nginx and Apache basic authentication with bcrypt or APR1, hashed in your browser. -
security.txt Generator
Write a valid /.well-known/security.txt so researchers know how to report a vulnerability, or check an existing one against RFC 9116.
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