A Lookup
Checks which IPv4 addresses domains or hostnames resolve to, with multiple entries supported in one lookup.
DNS Records
Core DNS records for domains and hostnames.
Open DNS Records hubAAAA Lookup
Checks which IPv6 addresses domains or hostnames resolve to, useful for reviewing dual-stack DNS setup.
CNAME Lookup
Shows which canonical name a hostname aliases to, helping verify subdomains or third-party service setup.
NS Lookup
Shows the nameservers for a domain and resolves each nameserver IP for DNS infrastructure checks.
TXT Lookup
Reads TXT records used for domain verification, SPF, DKIM, and service configuration stored in DNS.
SOA Lookup
Shows zone authority details such as primary nameserver, serial, refresh, retry, and expire values.
SRV Lookup
Checks service endpoints, ports, priority, and weight values declared through SRV records.
CAA Lookup
Shows which certificate authorities are allowed to issue SSL/TLS certificates for a domain.
All Records
Collects common DNS records in one check so you can quickly review a domain overall configuration.
DNS Propagation Checker
Compares DNS answers from multiple public resolvers to see whether record changes are consistent.
DNSSEC Checker
Checks DS, DNSKEY, and RRSIG records to confirm whether a domain exposes DNSSEC validation data.
Email Security
MX, SPF, DKIM, and DMARC for email operations.
Open Email Security hubMX Lookup
Shows the mail servers receiving email for a domain and resolves each MX target IP for mail routing checks.
SPF Lookup
Extracts SPF records from TXT records to identify which sources may send mail for a domain.
DKIM Lookup
Looks up a DKIM public key by selector to help verify email signing configuration for a domain.
DMARC Lookup
Looks up the DMARC record at _dmarc to review how a domain handles spoofed or unauthenticated mail.
SPF Analyzer
Analyzes SPF mechanisms, counts DNS lookups, and highlights settings that may cause SPF failures.
DMARC Analyzer
Reads DMARC policy, SPF/DKIM alignment, pct, rua/ruf, and key settings for anti-spoofing reviews.
Email DNS Health Check
Reviews MX, SPF, DKIM, DMARC, MTA-STS, and TLS-RPT for a domain in one consolidated table.
MTA-STS / TLS-RPT Checker
Checks MTA-STS and TLS-RPT records to review TLS protection for SMTP delivery.
DKIM Record Analyzer
Parses DKIM TXT records, splits tags, and checks key type, public key length, and related warnings.
DKIM Generator
Generates a DKIM RSA key pair and matching TXT record in memory for email signing setup.
DMARC Record Generator
Generates a DMARC TXT record from policy, reporting URIs, alignment, and pct rollout settings.
SPF Record Generator
Generates an SPF TXT record from sending sources such as MX, A, include, ip4, ip6, and all policy.
Email Header Analyzer
Analyzes raw email headers to show Received paths, SPF/DKIM/DMARC results, and related sending IPs.
SMTP TLS Checker
Checks whether an SMTP server supports STARTTLS, including protocol, cipher, and certificate verification.
Blacklist / RBL Checker
Checks whether an IP address or domain appears on common DNSBL/RBL blacklist zones.
Mail Server Banner Checker
Reads an SMTP banner and EHLO capabilities from a mail server without sending a test message.
Autodiscover / Autoconfig Checker
Checks Autodiscover and Autoconfig records and endpoints for Outlook, Thunderbird, and mail clients.
ARC Header Analyzer
Analyzes ARC headers in email, including ARC-Seal, ARC-Message-Signature, and ARC-Authentication-Results.
Gmail Dot Trick
Generates Gmail dot-address variants for testing forms, sign-up flows, or email handling.
Email Signature Generator
Creates a simple HTML email signature with personal details, contact information, and social links.
Network / IP
IP lookup, reverse DNS, and network information.
Open Network / IP hubIP Lookup
Looks up IP, ASN, ISP, organization, geolocation, timezone, and PTR for log and traffic source checks.
PTR Lookup
Performs reverse DNS from an IP address to hostname, useful for mail server, log, and host identity checks.
What is my IP?
Shows the current public IP seen by the server and selected connection headers from the browser request.
Subnet Calculator
Calculates network, broadcast, subnet mask, wildcard, and usable host count from IPv4/CIDR.
IP Subnet Planner
Splits a base IPv4/CIDR range into VLSM subnets based on required host counts.
CIDR Checker
Checks whether an IPv4 address belongs to one or more CIDR ranges, allowlists, or firewall rules.
IP Range to CIDR
Converts a start-end IPv4 range into the smallest practical list of CIDR blocks.
CIDR to IP Range
Expands CIDR blocks into network, broadcast, and usable IP ranges for network configuration checks.
Port Checker
Checks whether TCP ports on a host or IP are open, closed, or not responding from the server side.
RDAP Lookup
Looks up domain registration or IP/ASN allocation data through RDAP from the relevant registry.
IPv4 Converter
Converts IPv4 between dotted decimal, integer, hex, and binary formats for network debugging.
IPv6 Formatter
Expands, compresses, and creates reverse DNS notation for IPv6 addresses.
HTTP Header Checker
Shows status code, redirect chain, response headers, response IP, and basic security headers for a URL.
Bulk HTTP Status Checker
Checks multiple URLs at once, showing status code, final URL, response IP, and response time.
Security Headers Checker
Reviews HTTP security headers such as HSTS, CSP, X-Frame-Options, and Referrer-Policy.
Redirect Chain Checker
Traces every redirect step for a URL to detect loops, long chains, or incorrect canonical redirects.
SSL / TLS
Generate, decode, and verify certificates, CSRs, private keys, and chains.
Open SSL / TLS hubSSL Certificate Checker
Reads the live SSL/TLS certificate from a server, showing expiry, issuer, subject, SANs, and fingerprints.
SSL Expiry Monitor
Checks SSL/TLS expiry for multiple domains or endpoints and highlights certificates nearing expiration.
Private Key Generator
Generates RSA or ECDSA private keys in memory for CSR preparation or SSL/TLS configuration.
CSR Generator
Generates a CSR with private key, supporting subject, SAN, RSA, and ECDSA certificate requests.
CSR Decoder
Decodes a CSR to verify subject, SANs, public key, and signature algorithm before sending it to a CA.
SSL Certificate Decoder
Decodes PEM/CRT certificates to show issuer, subject, SANs, serial, validity period, and fingerprints.
SSL Converter
Converts PEM, DER, and PFX formats, creates PFX files, or extracts PFX contents in memory.
SSL Match Checker
Checks whether a private key matches a CSR or certificate before SSL/TLS installation.
Certificate Chain Checker
Checks fullchain order, issuer-subject links, and signatures between certificates in the chain.
TLS Cipher / Protocol Checker
Checks the TLS protocol and cipher negotiated by a server, with quick TLS 1.2 and 1.3 tests.
PEM Bundle Splitter
Splits a PEM bundle, identifies leaf/intermediate/root certificates, and rebuilds an ordered fullchain.
Generators
Quickly generate passwords, UUIDs, QR codes, fake data, and small snippets.
Open Generators hubPassword Generator
Generates strong passwords in the browser with options for length, uppercase, lowercase, numbers, and symbols.
UUID Generator
Generates random UUID v4 values for testing, temporary identifiers, or sample data.
Random Number Generator
Generates one or more random numbers in a custom range for draws, sampling, or quick tests.
SSH Key Generator
Generates an SSH RSA key pair in memory, with public and private keys ready to copy or download.
htpasswd Generator
Generates a .htpasswd line for Basic Auth using bcrypt, apr1, or SHA-1 hashing.
Robots.txt Generator
Generates robots.txt with User-agent, Allow, Disallow, Crawl-delay, and Sitemap directives.
Sitemap XML Generator
Generates XML sitemaps from URL lists, lastmod, changefreq, and priority values for crawlers.
Nginx Server Block Generator
Generates a basic Nginx server block for PHP or static sites, including domain, root, and SSL options.
Apache VirtualHost Generator
Generates Apache VirtualHost configuration for local domains, XAMPP, or small websites.
Docker Compose Generator
Generates a basic docker-compose.yml for Nginx, PHP-FPM, MySQL, and Redis in development setups.
Cron Expression Generator
Generates cron expressions from presets or individual time fields for scheduled task configuration.
Regex Generator / Tester
Generates common regex patterns and tests them directly against sample input.
Lorem Ipsum Generator
Generates Vietnamese or English placeholder text for layouts, mockups, and sample content.
Slug Generator
Converts Vietnamese or English titles into clean slugs for URLs and SEO-friendly paths.
UUID v7 Generator
Generates timestamp-based UUID v7 values for random IDs that remain sortable by time.
API Key / Token Generator
Generates random API keys or tokens with Web Crypto, optional prefixes, and copy-ready formatting.
SQL Insert Generator
Converts small JSON or CSV data into SQL INSERT statements for quick testing or seeding.
JSON Schema Generator
Generates a basic JSON Schema from sample JSON to describe data types and API structure.
QR Code Generator
Generates QR codes from URLs or text for quick sharing on phones or documents.
Calculators
Small calculators for dates, percentages, BMI, ratios, and currency.
Open Calculators hubBMI Calculator
Calculates BMI from weight and height, with a basic reference category for body status.
Sleep Calculator
Suggests bedtime or wake-up time based on approximate 90-minute sleep cycles.
Date Calculator
Calculates the difference between two dates or adds and subtracts days from a date.
Workday Calculator
Adds, subtracts, or counts business days while excluding weekends and custom holidays.
Percentage Calculator
Calculates percent of a number, ratios between values, and percentage increase or decrease.
Currency Converter
Converts currencies using a public exchange-rate API for quick value estimates.
Aspect Ratio Calculator
Calculates aspect ratios and matching dimensions for images, videos, or layouts.
Data Transfer Calculator
Estimates download or upload time from data size, network speed, and overhead.
Bandwidth Calculator
Estimates average bandwidth, active-hour bandwidth, and daily or monthly traffic volume.
Uptime / SLA Calculator
Calculates allowed downtime from an SLA and compares it with actual outage duration.
Loan / Mortgage Calculator
Estimates installment payments, total interest, and early principal/interest schedule for a loan.
Compound Interest Calculator
Calculates compound growth from initial amount, recurring contributions, annual return, and duration.
Unit Converter
Converts common units such as length, weight, temperature, and data size.
Salary Calculator
Estimates net salary from gross salary with insurance, deductions, and a basic personal income tax model.
Age Calculator
Calculates age in years, months, and days, plus days remaining until the next birthday.
Time Zone Converter
Converts a time between common time zones and provides the matching UTC or Unix timestamp.
Calorie / TDEE Calculator
Estimates BMR, TDEE, target calories, and reference protein needs from basic body data.
Tip / Split Bill Calculator
Calculates tip, tax or fees, total payment, and per-person amount when splitting a bill.
Text / Data
Tools for text, Markdown, CSV, and JSON.
Open Text / Data hubWord Counter
Counts words, characters, lines, and paragraphs for writing, editing, or length-limit checks.
CSV to JSON/Excel Converter
Converts simple CSV into JSON or TSV for reading, copying, or spreadsheet workflows.
JSON Editor
Formats, minifies, and validates JSON while debugging APIs or editing configuration data.
Markdown Editor
Writes Markdown with a quick preview before using it in README files, docs, or posts.
Text Diff / Compare
Compares two text blocks and highlights added, removed, or changed lines.
Base64 Converter
Encodes or decodes Base64 for UTF-8 text used in tokens, headers, or small configuration values.
URL Encoder & Decoder
Encodes, decodes, and inspects URL query parameters for links, API endpoints, or tracking URLs.
Text Cleaner
Cleans text by removing extra spacing, blank lines, and normalizing line endings.
Sort / Deduplicate Lines
Sorts line-based lists, removes duplicates, and counts repeated values.
Case Converter
Converts text between lowercase, uppercase, Title Case, camelCase, snake_case, and other common styles.
HTML Entity Encoder / Decoder
Encodes or decodes HTML entities when special characters need safe HTML display.
Regex Tester
Tests regular expressions, showing matches, capture groups, and replacement output on sample data.
YAML ↔ JSON Converter
Converts basic YAML to JSON and JSON to YAML directly in the browser.
XML Formatter / XML to JSON
Formats, minifies XML, and converts XML into readable JSON for integration data checks.
JSON Formatter / Minifier
Beautifies, minifies, validates JSON, and optionally sorts keys for API data.
Markdown Table Generator
Converts CSV, TSV, or column lists into Markdown tables ready for documentation.
List Converter
Converts line-based lists into JSON arrays, CSV, quoted lists, or SQL IN clauses.
Text Extractor
Extracts emails, URLs, domains, IP addresses, and phone numbers from text or logs.
Data Masker
Masks emails, phone numbers, IPs, and tokens before sharing logs or sensitive data.
Escape / Unescape Tool
Escapes or unescapes strings for JSON, JavaScript, HTML, SQL, and regex contexts.
Timestamp Converter
Converts Unix timestamps, milliseconds, and ISO dates into readable date-time formats.
Advanced Character Counter
Counts characters, UTF-8 bytes, words, lines, paragraphs, reading time, and frequent words.
Developer
Small utilities for debugging, metadata, JWT, and cron.
Open Developer hubJWT Debugger
Decodes JWT header and payload in the browser to inspect claims, expiry, and token structure.
Unix Time Converter
Converts Unix timestamps to local/UTC time and converts date-time values back to timestamps.
Hash Text (Crypto)
Generates SHA-1, SHA-256, SHA-384, and SHA-512 hashes for text comparison.
Meta Tag Generator
Generates SEO, Open Graph, and Twitter/X meta tags with image previews for websites.
Crontab Explainer
Explains the five basic fields of a cron expression and when the scheduled task runs.
JS Beautify
Formats JavaScript quickly so snippets are easier to read before debugging or sharing.
JS Obfuscator
Applies basic JavaScript obfuscation to small snippets when direct reading should be harder.
Curl to Code
Converts basic cURL commands into editable JavaScript, PHP, or Python snippets.
Fake Data Generator
Generates sample JSON data such as names, emails, phone numbers, and addresses for quick tests.
Campaign URL Builder
Builds campaign URLs with UTM source, medium, campaign, term, and content parameters.
API Request Builder
Builds and sends HTTP requests quickly to inspect methods, headers, bodies, status codes, and responses while debugging APIs.
Query String Parser
Splits URLs into host, path, fragment, and query parameters for inspection or URL rebuilding.
JSONPath Tester
Runs basic JSONPath expressions against sample JSON to quickly extract fields from API responses.
JWT Generator
Generates and signs HS256, HS384, or HS512 JWTs from header, payload, and secret in the browser.
Unix Time Range Helper
Creates timestamps for now, expiry moments, day boundaries, weeks, and months while testing systems.
Advanced Regex Tester
Tests regex patterns, flags, match positions, capture groups, and replacement output.
HTML CSS JS Minifier
Minifies HTML, CSS, or JavaScript snippets by removing comments and extra whitespace.
CSS Formatter
Formats CSS blocks and properties so stylesheets are easier to read during review or debugging.
SQL Formatter
Formats SELECT, JOIN, WHERE, GROUP BY, ORDER BY, and common SQL statements for readability.
.env Validator
Checks invalid lines, duplicate keys, and empty variables in .env files before deployment.
YAML TOML Validator
Checks basic YAML/TOML structure such as indentation, sections, key-value pairs, and common line errors.
Dockerfile Generator
Generates starter Dockerfiles for Node.js, PHP Apache, Python, Go, or static sites.
Nginx Rewrite Tester
Simulates simple Nginx regex rewrites to see whether a path matches and what it becomes.
Gitignore Generator
Composes .gitignore files for stacks such as Node.js, PHP, Python, Docker, Windows, macOS, and IDEs.
SemVer Comparator
Compares semantic versions and checks whether a version satisfies ranges such as ^, ~, >=, or <.
Images
Work with images, screenshots, QR codes, and browser-based image files.
Open Images hubQR Code Reader
Reads QR code content from an image directly in the browser.
Photo Booth
Takes quick snapshots from the browser camera and lets you download the result.
Image Compressor
Reduces image file size by changing quality, format, or maximum width before download.
Image Resizer
Resizes images by width and height, with an aspect-ratio option to avoid distortion.
Image Format Converter
Converts images to PNG, JPG, or WebP in the browser without uploading to a server.
Image Cropper
Crops images by custom area or common ratios such as 1:1, 4:3, 16:9, and 9:16.
Image Watermark
Adds a text watermark to images with position, color, font size, and opacity controls.
Image Metadata Remover
Re-exports images through canvas to remove EXIF, GPS, and embedded metadata from the original file.
Image Metadata Viewer
Shows file size, image dimensions, and common EXIF fields when the image contains metadata.
Placeholder Image Generator
Generates placeholder images with custom dimensions, background, and text for mockups or development.
Open Graph Image Generator
Generates 1200x630 Open Graph images for social sharing and link previews.
App Icon Generator
Generates common icon sizes such as 16, 32, 180, 192, and 512 pixels from an image or initials.
Rounded Image Generator
Rounds image corners and exports PNG with transparent or colored background.
Image Padding & Background
Adds padding, background color, and centered framing before sharing or publishing product images.
Image Redactor
Blurs or pixelates part of an image to hide email addresses, phone numbers, IPs, or sensitive details.
Before/After Image Compare
Compares two images with a before/after slider for edited images or visual UI checks.
Dominant Color Analyzer
Finds dominant color, average color, prominent palette, and readable text color from an image.
Screenshot Beautifier
Adds background, padding, rounded corners, and shadow to screenshots before sharing.
Productivity
Small tools for focus, timing, and random choices.
Open Productivity hubTyping Speed Test
Measures typing speed in WPM, accuracy, and mistakes during a short typing test.
Lucky Wheel
Lets you enter options and spin for a random pick when drawing lots or making quick choices.
Pomodoro Timer
Runs Pomodoro sessions to track focus time and short breaks in cycles.
Stopwatch
Provides a stopwatch with pause and lap recording for activities that need timing.
CV Builder
Builds a one-page CV from personal details, experience, and skills, ready to print or save as PDF.
To-do List
Captures tasks, due dates, and completion states in a lightweight browser-based to-do list.
Mini Kanban Board
Manages work across To do, Doing, and Done columns without accounts or complex project software.
Eisenhower Matrix
Prioritizes tasks by urgency and importance to decide what should be done first.
Time Blocking Planner
Splits a workday into time blocks, organizes schedules, and copies the plan as text.
Focus Session Planner
Sets a focus goal, runs a timer, and records notes after each completed session.
Meeting Notes Generator
Generates Markdown meeting notes from participants, agenda, decisions, and action items.
Daily Planner
Prepares top priorities, daily schedule, notes, and a copy-ready daily plan.
Weekly Review
Reviews completed work, unfinished items, lessons learned, and priorities for the next week.
Habit Tracker
Tracks habits over seven days, marks progress, and stores the state in the browser.
Decision Matrix
Compares options with weighted criteria and total scores for clearer decisions.
Priority Score Calculator
Scores task priority by impact, urgency, confidence, and effort before scheduling work.
Task Time Estimator
Adds tasks, estimates minutes for each item, and totals workload in hours.
Break Reminder
Runs short break reminders using custom work cycles or the 20-20-20 eye-rest rule.
Reading Time Calculator
Calculates words, characters, and estimated reading time from a custom reading speed.
Quick Notes
Keeps temporary scratch notes in the browser with copy, clear, and txt download actions.
Design
Color and visual checking tools.
Open Design hubImage Color Palette Extractor
Extracts prominent colors from an image and provides color values for design reuse.
Color Converter
Converts colors between HEX, RGB, and HSL with a quick color preview.
Color Contrast Checker
Checks WCAG contrast ratio between text and background colors to review readability.
Scrollbar Customizer
Generates custom scrollbar CSS and previews it live before adding it to an interface.
CSS Gradient Generator
Creates linear or radial gradients with a visual preview and copyable CSS background output.
Box Shadow Generator
Creates soft shadows for cards, panels, or buttons with x, y, blur, spread, and opacity controls.
Border Radius Generator
Adjusts each corner radius with a shape preview and copyable border-radius CSS.
Glassmorphism Generator
Creates frosted glass UI effects with transparent backgrounds, blur, border, radius, and shadow.
Neumorphism Generator
Creates subtle raised or pressed neumorphic effects from base color, shadow distance, and blur.
CSS Clamp Font Generator
Generates responsive font-size clamp() formulas based on minimum and maximum viewport widths.
Fluid Spacing Generator
Generates responsive padding, margin, or gap values with clamp() for flexible layouts.
Color Scale Generator
Generates a 50-950 color scale from one base color for UI color tokens.
Accessible Palette Builder
Checks contrast ratios and suggests readable text colors for the selected background.
UI Color Token Generator
Generates CSS variables for primary, accent, surface, and text colors in light/dark themes.
SVG Optimizer
Cleans SVG by removing XML headers, comments, metadata, and unnecessary whitespace.
SVG to Data URI Converter
Converts SVG into a data URI for CSS background or HTML embedding.
Favicon Helper
Generates favicon, apple-touch-icon, manifest, and theme-color snippets.
CSS Grid Generator
Generates responsive CSS Grid layouts with columns, minmax, gap, and visual preview.
Flexbox Playground
Tests flex-direction, wrap, justify-content, align-items, and gap with a visual preview.
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