free, no sign-up
Anto's Tools
Small, free tools for the jobs that come up when you run your own servers. No sign-up, no tracking of what you type: everything runs in your browser. Each tool links to the guides that explain the why.
Security
CVSS 3.1 Base Score Calculator
Work out a CVSS 3.1 base score and severity from the eight base metrics, and copy the vector string for your report or ticket.
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SSH Legacy Host Config Generator
Fix "no matching host key type found" and similar SSH errors for one old device, safely. Paste the error, get the exact ~/.ssh/config lines.
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Password and htpasswd Generator
Generate strong random passwords or EFF passphrases in your browser, with an entropy meter, and make a bcrypt htpasswd line for Nginx, Apache or Traefik.
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Networking
Subnet Calculator (IPv4 CIDR)
Work out the network, broadcast, usable host range, netmask and wildcard for any IPv4 CIDR, and split it into smaller subnets for VLANs.
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DNS Lookup
Look up A, AAAA, CNAME, MX, TXT, NS, SOA and CAA records for any domain, straight from your browser over secure DNS.
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File Transfer Time Calculator
Estimate how long a file or backup will take to copy over a given connection speed, with a realistic efficiency allowance.
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Common Ports Lookup
Search a reference list of common TCP and UDP ports for self-hosting and home labs, with the service and a short note for each.
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Servers & self-hosting
RAID and NAS Capacity Calculator
Work out usable capacity, storage efficiency and fault tolerance for RAID 0, 1, 5, 6, 10 and Synology SHR before you buy disks.
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docker run to Compose Converter
Paste a docker run command and get a clean compose.yaml, with ports, volumes, environment variables, restart policy and more mapped across.
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Cron Expression Builder and Explainer
Build a crontab line from a schedule, or paste one to see what it means in plain English and when it will run next.
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systemd Service and Timer Generator
Generate a systemd .service unit, and optionally a .timer, to run your own app or script as a managed service on Linux, with sensible hardening defaults.
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chmod Calculator (Linux File Permissions)
Convert Linux file permissions between numbers (755, 640) and rwx, tick boxes to build them, and get the chmod command, with warnings for risky settings.
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Reverse Proxy Config Generator
Generate an Nginx server block, a Caddyfile or Traefik docker-compose labels to put a domain and HTTPS in front of a self-hosted app.
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Developer utilities
Unix Timestamp Converter
Convert a Unix timestamp to a human date in UTC and your local zone, and back again. Handles seconds and milliseconds.
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Base64 and URL Encoder / Decoder
Encode or decode text with Base64, URL-safe Base64 or URL percent-encoding, in your browser, with full UTF-8 support.
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JWT Decoder
Decode a JSON Web Token to read its header and payload, with issued and expiry times shown as readable dates. Decoding only, no signature check.
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Regex Tester
Test a JavaScript regular expression against your own text, with live match highlighting and capture groups, safely sandboxed against runaway patterns.
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YAML and JSON Converter
Convert between YAML and JSON in your browser, with clear error messages. Handy for Docker Compose, Kubernetes, Ansible and CI config.
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