Tool Nexus
121 tools for the MacSimTech tech team — lookups, calculators, generators and live service status.
Suggested
Featured
CVE Lookup
Search the NIST NVD for vulnerability details by CVE ID or keyword.
Windows Error Codes
Decode HRESULT, NTSTATUS, Win32 and BSOD stop codes.
Windows Event Lookup
Look up Windows Event IDs with source, severity and common causes.
M365 SKU Decoder
Translate Microsoft 365 license SKU / service plan strings to product names.
Azure Tenant Lookup
Find the Microsoft Entra tenant behind an Azure subscription ID, tenant ID, or domain.
Email Analyzer
Paste headers or drop a .eml: MHA-style hop/anti-spam decode, auth & sender checks, links, attachment hashes, and Sublime detections.
Subnet Calculator
Calculate network, broadcast, host range and mask for an IPv4 CIDR.
Domain Lookup
Live DNS records (A, MX, TXT, NS) plus SPF/DMARC inspection for a domain.
OneTimeSecret
Create a one-time, self-destructing link to share a secret securely.
Password Generator
Generate strong password, Diceware-style.
TOTP Generator
Create a TOTP secret with QR code for enrolling authenticator apps.
SafeLink Decoder
Unwrap Microsoft Defender, Proofpoint and Mimecast URL-defense links to the original URL.
Merge PDF
Combine multiple PDF files into one, reordering them however you like.
Image to PDF
Combine JPG and PNG images into a PDF with a chosen page size and orientation.
PDF to Image
Render each page of a PDF to a downloadable PNG image, entirely in your browser.
MSP & Windows
Lookups and references for day-to-day managed-services work.
CVE Lookup
Search the NIST NVD for vulnerability details by CVE ID or keyword.
Windows Error Codes
Decode HRESULT, NTSTATUS, Win32 and BSOD stop codes.
Windows Event Lookup
Look up Windows Event IDs with source, severity and common causes.
M365 SKU Decoder
Translate Microsoft 365 license SKU / service plan strings to product names.
Port & Protocol Reference
Search common TCP/UDP ports with service and security notes.
Azure Tenant Lookup
Find the Microsoft Entra tenant behind an Azure subscription ID, tenant ID, or domain.
Email Analyzer
Paste headers or drop a .eml: MHA-style hop/anti-spam decode, auth & sender checks, links, attachment hashes, and Sublime detections.
Exchange NDR Lookup
Translate Exchange / Microsoft 365 NDR bounce codes into causes and fixes.
Group Policy Reference
Search common GPO settings by name, path or registry key.
PowerShell Builder
Build common PowerShell one-liners for M365, AD and Windows admin.
SafeLink Decoder
Unwrap Microsoft Defender, Proofpoint and Mimecast URL-defense links to the original URL.
Network & Email
IP, DNS, subnets, mail-flow and address tooling.
My IP Info
Show your public IP, reverse DNS hostname and user agent.
Subnet Calculator
Calculate network, broadcast, host range and mask for an IPv4 CIDR.
MAC Address Lookup
Resolve a MAC / OUI prefix to its hardware vendor.
Domain Lookup
Live DNS records (A, MX, TXT, NS) plus SPF/DMARC inspection for a domain.
Malicious IP Report
Report a suspicious IP address to the security team.
IPv4 Address Converter
Convert an IPv4 address between decimal, integer, hex and binary.
IPv4 Range Expander
Expand a CIDR or start-end range into covering CIDR blocks.
IPv6 ULA Generator
Generate an RFC 4193 Unique Local Address prefix (fd00::/8).
URL Parser
Parse a URL into its components and list query parameters.
URL Encoder / Decoder
Percent-encode and decode URLs, live both ways.
User-Agent Parser
Parse a User-Agent string into browser, OS, device and engine.
Phone Parser & Formatter
Parse and validate a phone number into E.164 and other formats.
MAC Address Generator
Generate random MAC addresses with separator, case and OUI options.
WiFi QR Code Generator
Generate a scannable WiFi join QR code from SSID, password and encryption type.
Email Normalizer
Normalize email addresses (Gmail dots, +tags) and find duplicate aliases.
Random Port Generator
Generate random TCP ports in the ephemeral range, avoiding well-known ports.
Crypto & Encoding
Hashing, tokens, secrets and encoding helpers.
OneTimeSecret
Create a one-time, self-destructing link to share a secret securely.
Password Generator
Generate strong password, Diceware-style.
TOTP Generator
Create a TOTP secret with QR code for enrolling authenticator apps.
Hash Text
Hash text with MD5, SHA-1, SHA-256 and SHA-512.
HMAC Generator
Compute an HMAC of a message with a secret key (SHA-1/256/512).
Bcrypt Hash & Compare
Generate a bcrypt hash with adjustable cost and compare a string against a hash.
JWT Parser
Decode a JWT's header and payload with human-readable dates (decode only).
UUID Generator
Generate v4 UUIDs in bulk with uppercase toggle and NIL UUID.
ULID Generator
Generate sortable ULIDs and see each embedded timestamp.
Basic Auth Generator
Turn a username and password into an HTTP Basic header and curl example.
Password Strength Analyser
Estimate password entropy and crack time with tips. Fully offline.
Token Generator
Generate cryptographically random tokens with charset toggles.
Text Encryption
Encrypt and decrypt text with a passphrase using AES-GCM (PBKDF2 key).
RSA Key Pair Generator
Generate an RSA key pair and export public/private keys as PEM.
BIP39 Mnemonic Generator
Generate and validate BIP39 recovery phrases with entropy output.
Base64 String Converter
Encode and decode text to and from Base64, with a URL-safe variant.
Base64 File Converter
Convert a file to Base64 / data URL, or decode Base64 into a file.
Data & Formats
Convert, format and inspect structured data.
UniFi Backup Explorer
Decrypt and browse UniFi Network .unf backups locally in your browser.
Integer Base Converter
Convert an integer between binary, octal, decimal, hex and any base 2-36.
JSON Prettify
Format and validate JSON with indentation, key sorting and minify.
JSON Minify
Compress JSON to one line and see the bytes saved.
JSON to CSV
Convert a JSON array of objects to CSV with copy and download.
JSON Diff
Deep structural diff of two JSON documents.
YAML Converter
Convert between YAML and JSON in either direction.
XML Formatter
Pretty-print or minify XML with validation.
SQL Prettify
Format SQL queries with a selectable dialect.
TOML Converter
Convert between TOML and JSON in either direction.
MIME Types
Look up MIME / content types by file extension.
CSV to JSON
Parse CSV with quoted fields into a JSON array of objects using the header row as keys.
XML to JSON
Convert XML into pretty JSON with attributes preserved.
Text & Generators
Transform text and generate test data.
Text to Binary
Convert text to space-separated 8-bit binary and back (UTF-8 aware).
Text to Unicode
Convert text to Unicode code points (U+XXXX / \uXXXX) and back.
Text to NATO Alphabet
Spell text using the NATO phonetic alphabet.
Roman Numeral Converter
Convert integers (1-3999) to Roman numerals and back.
List Converter
Transform lines: sort, dedupe, trim, case, prefix/suffix, join.
Markdown to HTML
Render Markdown to HTML with a live preview and HTML source.
Text Statistics
Live counts of characters, words, lines, sentences and reading time.
Text Diff
Line-level diff of two texts, highlighting added and removed lines.
Lorem Ipsum Generator
Generate placeholder lorem ipsum text with adjustable structure.
Emoji Picker
Search a curated emoji set and click to copy, with code points.
String Obfuscator
Mask a sensitive string for safe sharing, keeping the ends visible.
Slugify String
Convert text into a clean URL-safe slug.
Case Converter
Convert text between camelCase, snake_case, kebab-case, Title, UPPER, lower and more, all at once.
Find & Replace
Find and replace text with case-insensitive, regex, and replace-all or first-only options.
Web & Dev
References and utilities for the web platform.
HTTP Status Codes
Reference for every HTTP status code and its meaning.
HTML Entities
Encode text to HTML entities and decode entities back.
Regex Tester
Test regular expressions with live highlighting and capture groups.
Crontab Generator
Describe a cron expression in plain English with presets.
Chmod Calculator
Convert between octal, symbolic and rwx permission checkboxes.
Color Converter
Convert a color between HEX, RGB, HSL and HSV with a live swatch.
Date & Time Converter
Convert dates and unix timestamps to ISO, UTC, locale and relative.
Meta Tag Generator
Generate SEO, Open Graph and Twitter Card meta tags.
QR Code Generator
Turn text or a URL into a downloadable QR code.
SVG Placeholder Generator
Create placeholder image SVGs with custom size, colors and text.
Keycode Info
Press any key to inspect its key, code, keyCode and modifiers.
Device Information
Live client info: screen, viewport, UA, cores, memory and more.
Percentage Calculator
Percentage of, is-what-percent, and percentage-change modes.
Temperature Converter
Convert between Celsius, Fahrenheit, Kelvin and Rankine.
Math Evaluator
Evaluate math expressions safely with functions and constants.
docker run → compose
Convert a docker run command into an equivalent docker-compose.yml.
Git Cheatsheet
Searchable reference of common git commands by topic.
Regex Cheatsheet
Searchable reference of regex tokens, quantifiers, groups and lookarounds.
JSON to TypeScript
Infer TypeScript interfaces from a JSON sample, including nested objects and arrays.
CSS Minifier
Minify CSS by stripping comments and whitespace, with the size saved.
HTML Minifier
Minify HTML by removing comments and collapsing whitespace.
robots.txt Generator
Build a robots.txt with per-user-agent allow/disallow rules, crawl-delay and a sitemap URL.
Sitemap Generator
Turn a list of URLs into a valid XML sitemap with optional changefreq and priority.
HTTP Headers Reference
Searchable reference of common HTTP request and response headers with examples.
Text to Speech
Read text aloud using the browser's speech engine with selectable voice, rate and pitch.
Image Tools
Resize, convert, crop and optimise images — all in your browser.
Image Compressor
Compress an image to JPEG or WebP with an adjustable quality slider and see the bytes saved.
Image Resizer
Resize an image by pixels or percentage with an optional aspect-ratio lock.
Image Cropper
Crop an image to a precise X/Y/width/height region shown as a live overlay.
JPG to PNG
Convert a JPG/JPEG image to lossless PNG in your browser.
PNG to JPG
Convert a PNG to JPG with a background fill for transparency and a quality level.
SVG to PNG
Rasterize an SVG file or pasted markup to a PNG at a chosen scale or width.
Image Metadata Stripper
Re-encode an image to strip embedded EXIF, GPS and other metadata while keeping the pixels.
Blurred Placeholder
Generate a tiny blurred LQIP data URL from an image for lazy-loading placeholders.
Base64 to Image
Decode a Base64 string or data URL into a previewable, downloadable image.
PDF Tools
Merge, split, stamp and transform PDFs locally — nothing is uploaded.
Merge PDF
Combine multiple PDF files into one, reordering them however you like.
Split PDF
Split a PDF into separate files, one per page or one per page range.
Remove PDF Pages
Delete specific pages or page ranges from a PDF.
Extract PDF Pages
Keep only the pages you choose from a PDF, in any order.
Add PDF Page Numbers
Stamp configurable page numbers onto every page of a PDF.
Add Watermark to PDF
Stamp a diagonal, semi-transparent text watermark across every page of a PDF.
Image to PDF
Combine JPG and PNG images into a PDF with a chosen page size and orientation.
Crop PDF
Trim top, right, bottom and left margins from every page of a PDF.
PDF to Image
Render each page of a PDF to a downloadable PNG image, entirely in your browser.
Date & Time
Timestamps, time zones, durations and date arithmetic.
Date Difference
Calculate the gap between two dates in days, weeks, months, years and total hours.
Time Calculator
Add or subtract a duration from a datetime, or sum a list of HH:MM:SS durations.
Time Zone Converter
Convert a datetime from a source IANA time zone into several target zones with UTC offsets.
World Clock
Live ticking clocks for a custom list of IANA time zones with local time and UTC offset.
Working Days Calculator
Count business days between two dates, excluding weekends and optional holidays.
Countdown Timer
Count down to a target datetime or a set duration with start, pause and reset.
Stopwatch
High-resolution stopwatch with start, pause, reset and lap recording.