Admin Tools by Cloud Captains

130+ developer and admin utilities in your browser, with AI Assistant powered by Chrome Gemini Nano. Offline and private.

Admin Tools is a free Chrome extension with more than 130 developer and system administration utilities, plus Chrome's built-in AI powered by Gemini Nano for fully offline and private text processing. No account, no cloud, no tracking. Built in Europe by Cloud Captains a Dutch Google Workspace partner. Whether you work as a developer, system administrator, DevOps engineer, IT consultant, security analyst or technical content creator, Admin Tools puts every tool you need each day, from regex testers and JSON formatters to encryption, WHOIS and AI text generation, one click away inside your browser. — Why install Admin Tools — - One extension replacing dozens of single-purpose Chrome extensions - 100 percent free, no in-app purchases, no premium tier, no upsell - Chrome built-in AI runs locally on your device, no API key, no usage limits - Privacy first by design: no account, no telemetry, no tracking, no data collection - Built in Europe by a Dutch Google Workspace partner - Almost every tool works fully offline, your data stays on your machine — AI assistant powered by Chrome Gemini Nano — Conversational AI chat with on-device Gemini Nano. Summarisation with TL;DR, key points, headline or teaser. Translation across 13 languages with offline detection. Drafting in any tone and length. Rewriting to rephrase, shorten or expand. Proofreading for grammar and spelling with correction types. Regex generation from plain English with live match preview. Regex explanation in plain language. Cron generation from a natural-language schedule. Cron explanation with the next three runs. SQL generation with optional schema. Conventional Commits messages with body. Branch name suggestions in kebab-case with type prefix. JSON Schema draft-07 generation from example JSON. JSON to TypeScript interfaces. cURL generation from an HTTP description. Stack-aware .gitignore generation. Code explanation in under 250 words. Professional email drafts in any tone. — Text and content tools — Case converter, text statistics, slugify, text sorter and line operations, find and replace with regex, text diff, list processor, column extractor, base64 encoder and decoder, character encoder, hash generator (MD5, SHA-1, SHA-256, SHA-512), markdown to HTML, lorem ipsum, morse code, binary text, upside-down text, text obfuscator, tokenizer, text to ASCII table, word cloud generator, readability score (Flesch, Flesch-Kincaid, Gunning Fog), keyword density analyser with n-gram and stopword filter. — Web and URL utilities — URL encoder and decoder, URL parser, website tech detector, meta tag analyser, robots.txt and sitemap viewer, favicon extractor, Open Graph generator, HTTP status code reference, user information, cookie editor, local storage manager, DOM inspector, Wayback Machine lookup, domain age checker, subdomain enumeration, accessibility scanner, bulk email validator, domain reputation checker, mobile compatibility tester, media URL extractor, page to Markdown converter, SPF record generator, DMARC record generator, page transparency inspector covering cookies, third-party hosts, trackers and scripts. — Security, encryption and forensics — Text encryption and decryption with AES-256-GCM, file encryption and decryption with AES-256-GCM and PBKDF2, advanced password generator with live strength meter, password strength analyser, cryptographic hash generator, file checksum calculator, JWT decoder, JWT generator and signer, 2FA backup code generator, HMAC generator, credit card validator, Content Security Policy generator, PGP key generator with sign and verify, secure note shredder, steganography for text and image, security question generator, X.509 certificate viewer, OTP generator (TOTP and HOTP), security headers analyser, entropy calculator, BIP39 mnemonic generator, Vigenere cipher, Enigma emulator, magic bytes checker, strings extractor, file hash verifier, XSS payload generator, Google Dork builder, Shodan query helper, CVE quick lookup, Have I Been Pwned password check using k-anonymity, RSA key generator (2048, 3072, 4096), ECDSA digital signature (P-256, P-384, P-521). — Network and infrastructure — IPv4 subnet calculator, IPv4 address converter, IPv4 range expander, MAC address lookup, MAC address generator, IPv6 ULA generator, DNS lookup, connection diagnostics with public IP, ASN, reverse DNS, DNS resolvers and TCP probes, WHOIS lookup, URL connectivity tester, network speed test with multiple mirrors and jitter, ASN lookup, subnet to wildcard mask converter, ICMP ping. — Developer and system helpers — Code formatter and minifier, YAML to JSON converter, CSV to JSON converter, config file validator, SQL formatter, regex tester and extractor, REST API client, JWT signer, base64 file encoder and decoder, Mermaid diagram renderer, code template copier, shell script escaper, GUID and UUID generator, MIME type lookup, chmod calculator, crontab generator, Docker run to compose converter, environment variable helper, keycode info, random port generator, CSS unit converter, HTML tag generator, basic code linter, Git cheatsheet, webhook inspector, cURL to Fetch and Axios converter, jq playground, CSS clamp generator, glassmorphism generator, APCA contrast checker, CSS animation builder. — Time and date — Date-time converter, unix timestamp converter, chronometer, date and time difference, relative time, timezone converter, world clock, leap year checker, date arithmetic, meeting time coordinator, internet time, ICS calendar event generator, business days calculator, age calculator. — Numbers, math and science — Integer base converter, Roman numeral converter, ETA calculator, percentage calculator, physical unit converter, base-N and bitwise calculator, advanced random generator, financial calculators for loan, compound interest and tax, statistical calculator, prime number generator, ratio calculator, BMI and health calculators, number sequence generator, scientific notation converter, tip calculator, logarithm calculator, matrix calculator, resistor color code, Ohm's law calculator, molar mass calculator, radiation unit converter. — Image and QR — QR code generator with custom colors, centre logo, quiet zone, dot styles, PNG and SVG export with live preview. WiFi QR generator. SVG placeholder generator. Color picker with tonal palette and harmonies. Image to base64 converter. Advanced placeholder generator. Image palette extractor. Favicon generator with presets for web favicons, Chrome Web Store icons (16, 32, 48, 128) and PWA manifest. Image file info. QR code reader. Image resizer and compressor. Image metadata viewer (EXIF). Color contrast checker. Image difference detector. ASCII art generator. Meme generator. CSS filter generator. Image splitter. Image watermarker. Color palette generator. Alpha extractor (Transparify) that recovers transparency from AI-generated images by comparing white and black background renders. — Utilities, productivity and privacy — Device information, email normalizer, JSON diff, URL unshortener, phone parser and formatter, IBAN validator and parser, clipboard history, emoji picker, currency converter, special character copier, batch file renamer, fake data generator, decision maker, recipe scaler, team generator, dice and coin tools, KBD tag generator, NATO phonetic alphabet, braille translator, canvas fingerprint test, user agent analyser, BPM tapper, timer and stopwatch, Outlook safelink decoder. — Privacy is the foundation, not a feature — Privacy is not an afterthought in Admin Tools, it is the reason this extension exists in this form. Almost every tool runs entirely in your browser. Chrome's built-in AI processes text on your device using Gemini Nano, so your text never leaves your machine. The few tools that cannot work in a browser (such as WHOIS, subdomain enumeration, bulk email validation, ASN lookup and ping) use a small relay protected by a rotating HMAC-SHA256 token, strict per-IP rate limiting and an SSRF guard that blocks private and reserved ranges. Query content is never stored. No analytics, no telemetry, no third-party scripts. — Built in Europe by Cloud Captains — Admin Tools is built and maintained by Cloud Captains, a Google Workspace partner based in the Netherlands and active across Europe. We are an independent European company, easy to reach, with real people behind the product. We specialise in workflow automation, custom Google Workspace integrations, internal admin tooling and AI-driven productivity solutions for businesses, schools and public organisations. If you need help streamlining processes, integrating Google Workspace with your existing stack or building tailored internal tools, we are happy to talk. Visit cloud-captains.com to learn more about our services and get in touch. Made with care by Cloud Captains, more info https://cloud-captains.com/