ops@toolbox:~$ ls -la /usr/local/tools

Free tools for sysadmins & DevOps

49 everyday utilities: subnet calculator, VLSM planner, AD LDAP query builder, DB connection strings, cron visualizer, platform references and more. Every one runs entirely in your browser. No accounts, no uploads: your secrets and configs never leave your machine.

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security/
Password Generator
Cryptographically secure passwords and passphrases, generated locally in your browser.
Hash Generator
MD5, SHA-1, SHA-256, SHA-384 and SHA-512 checksums of any text, computed locally.
JWT Decoder
Decode JSON Web Tokens locally: header, payload, expiry check and human-readable claims.
htpasswd Generator
Generate bcrypt htpasswd entries for Apache and nginx basic auth, locally.
TOTP Code Generator
Generate 2FA codes from a Base32 secret, with live countdown, fully client-side.
SSL Certificate Decoder
Paste a PEM certificate and see subject, SANs, validity, issuer and key details.
TLS Cipher Reference
Searchable cipher suite table with RECOMMENDED / SAFE / WEAK / INSECURE security grades.
AD LDAP Query Builder
Build complex LDAP search filters visually for users, groups, computers and lockouts.
encoding/
Base64 Encoder / Decoder
Encode and decode Base64 and URL-safe Base64, with full UTF-8 support.
Hex Converter
Convert between text, hexadecimal, decimal and binary, plus number base conversion.
JSON Formatter & Validator
Pretty-print, minify and validate JSON with precise error locations.
URL Encoder / Decoder & Parser
Percent-encode or decode text, and split any URL into its parts.
YAML ↔ JSON Converter
Convert YAML to JSON and back, with validation, built for Kubernetes and Ansible files.
String Escape / Unescape
Escape and unescape strings for JSON, HTML, shell single-quoting and regex.
scheduling/
Cron Expression Generator
Build crontab expressions with dropdowns and translate existing ones to plain English.
Cron → systemd Timer Converter
Convert crontab expressions into systemd OnCalendar syntax and ready-to-use unit files.
Cron Schedule Visualizer
Visualize next 50 execution times and active windows for any crontab expression.
networking/
Subnet Calculator
IPv4 CIDR calculator with subnet split, find-prefix, visual bar and RFC annotations.
VLSM Subnet Planner
Plan subnets of varying sizes using Variable Length Subnet Masking (VLSM) dynamically.
Common Ports Reference
Searchable table of the network ports sysadmins actually meet, with notes.
HTTP Status Codes
Searchable HTTP status code reference with debugging notes for each code.
IPv6 Calculator
Expand, compress and subnet IPv6 addresses: network, range and address count.
IP Range → CIDR Converter
Convert an IPv4 address range into the minimal list of CIDR blocks.
Transfer Time Calculator
How long will it take to move X gigabytes at Y megabits per second?
Firewall Rule Builder
Build iptables, nftables and ufw rules with a GUI and get copy-ready commands instantly.
Network Troubleshooting Reference
Copy-ready ping, traceroute, mtr, nmap, ss, dig and tcpdump one-liners with notes.
virtual platforms/
VMware ESXi Reference
esxcli, PowerCLI and govc commands for VM management, storage, networking and host ops.
Hyper-V Reference
PowerShell Hyper-V cmdlets for VMs, checkpoints, networking and live migration.
Citrix Reference
CVAD PowerShell and Citrix ADC (NetScaler) CLI commands for admins and troubleshooters.
network hardware/
Switch CLI Reference
Cisco IOS, Cisco NX-OS and Dell OS10 command reference: show, interface, VLAN, STP, routing and more.
linux/
Chmod Calculator
Convert between numeric (755) and symbolic (rwxr-xr-x) Unix permissions.
generators/
UUID Generator
Generate UUID v4 identifiers in bulk, with uppercase and no-hyphen options.
Database Connection String Builder
Build secure database connection strings for ADO.NET, JDBC, Python, Node, PHP and Go.
time/
Unix Timestamp Converter
Convert Unix epoch timestamps to human-readable dates and back, with live clock.
text/
Diff Checker
Compare two texts line-by-line and see additions and removals highlighted.
User-Agent Parser
Decode user-agent strings: browser, engine, OS and bot detection.
Regex Tester
Test JavaScript regular expressions with live match highlighting and capture groups.
Case Converter & Slugify
Convert text between camelCase, snake_case, kebab-case, Title Case and URL slugs.
Line Sorter & Deduplicator
Sort, dedupe, trim, reverse and shuffle lines of text: IP lists, hostnames, logs.
Text & Byte Counter
Live character, word, line and UTF-8 byte counts for any text.
storage/
Byte Size Converter
Convert between B, KB, MB, GB, TB and their binary siblings KiB, MiB, GiB, TiB.
RAID Capacity Calculator
Usable capacity and fault tolerance for RAID 0, 1, 5, 6 and 10 arrays.
containers/
Docker Run → Compose Converter
Paste a docker run command and get an equivalent docker-compose.yml.
reference/
DNS Record Types
Searchable reference of DNS record types with practical notes.
HTTP Headers Reference
Searchable reference of the HTTP request and response headers that matter in operations.
Linux Signals Reference
kill -9 and friends: every signal a sysadmin meets, with default actions and notes.
tar Command Examples
The tar invocations you actually need: create, extract, list, compress, exclude.
rsync Command Examples
The rsync invocations that matter: mirror, dry-run, delete, resume, bandwidth limits.
find Command Examples
find one-liners for real work: by name, size, age, permissions, and safe bulk actions.

Why client-side tools matter for this job

The strings a sysadmin pastes into utility websites are, more often than not, sensitive: live bearer tokens, database connection strings, internal hostnames, fragments of production configs. Most online tool sites process those on a server you know nothing about. Everything on OpsToolbox is plain JavaScript executed in your tab. Open your browser's network panel while using any tool and watch: no request carries your input anywhere. The pages are also dependency-free static files, which is why they load fast and work fine on a flaky hotel connection during an on-call incident.

What's here

Generators (passwords, passphrases, UUIDs), encoders and decoders (Base64, hex, JWT), calculators (IPv4 subnets with split and find-prefix, chmod modes), converters (Unix timestamps, number bases), a cron expression builder with plain-English explanations, a JSON formatter with precise error locations, a line-by-line diff checker, a user-agent parser, a firewall rule builder for iptables/nftables/ufw, a network troubleshooting reference, and searchable references for network ports, HTTP status codes, and TLS cipher suites. Each tool page includes a short, practical write-up of the concepts and the gotchas that generate real tickets.