DNS / DKIM Inspector
Fetch A, MX, TXT, and CNAME records live. Validate SPF, DKIM, and DMARC syntax instantly.
- SPF / DMARC validation
- Live DNS-over-HTTPS lookup
- DKIM key parse
Subdomain Takeover Checker
Find subdomains that still point to deleted or decommissioned services — a common way attackers hijack forgotten subdomains.
- Scans common subdomain names
- Detects stale service pointers
- No server required
CSRF Token Generator
Generate cryptographically-secure anti-CSRF tokens with configurable length in hex or Base64URL.
- Cryptographically secure (browser-native)
- Hex & Base64URL output
- Usage code examples
SPF Record Creator
Build a valid SPF DNS TXT record by adding sending sources and choosing a policy.
- 15+ provider presets
- Policy selector
- DNS setup instructions
DKIM Key Generator
Generate an RSA-2048 DKIM key pair in your browser. Get the DNS TXT record and PEM private key.
- RSA-2048 / 1024-bit
- DNS record ready
- Private key download
Password Strength Visualizer
See how long a modern GPU cluster takes to crack your password. Entropy, patterns, suggestions.
- GPU crack-time estimate
- Entropy analysis
- Pattern warnings
SSL/TLS Certificate Checker
Inspect SSL/TLS configuration via DNS. Checks CAA records, TLSA/DANE, DNSSEC, HTTPS redirect, and links to full grading reports.
- CAA & TLSA/DANE records
- DNSSEC + HTTPS redirect
- Link to full SSL Labs report
Hash Generator
Generate MD5, SHA-1, SHA-256, SHA-384, SHA-512 hashes from text or any file. HMAC support. Hex, Base64, Base64URL.
- Text & file modes
- HMAC support
- Hex / Base64 / Base64URL
Resume Anonymizer
Strip name, email, phone, address, LinkedIn, and GitHub from resume text for bias-free hiring reviews. For HR teams and recruiters.
- 10 redaction types
- Redaction log
- Side-by-side preview
JWT Decoder
Decode JSON Web Tokens instantly — inspect header, payload, expiry status, issuer, and audience. All client-side.
- Header & payload decode
- Expiry status & claims
- Signature section
Password Generator
Generate cryptographically secure passwords using window.crypto. Configure length, charset, and strength. Bulk mode included.
- CSPRNG-backed
- Length 4–256
- Bulk generate + download
Is It Down for Everyone?
Check if a website is down for everyone or just you. Tests DNS, TCP ports, and HTTP response from our servers in seconds.
- DNS + TCP + HTTP check
- Redirect chain trace
- Local vs global diagnosis
Email Address Validator
Validate email addresses for format, MX records, and disposable domains. Bulk-check up to 100 emails at once.
- Format + MX record check
- Disposable domain detection
- Bulk 100 emails
WHOIS & Domain Age Checker
Look up domain registration, registrar, creation date, expiry countdown, name servers, DNSSEC, and live DNS records via RDAP.
- RDAP + live DNS lookup
- Expiry countdown alert
- DNSSEC + registrar info
HTTP Headers Inspector
Inspect HTTP response headers from any URL. Check security headers, cache policy, redirect chain, and get a security score.
- Security header score
- Redirect chain trace
- Cache & performance headers
SSL Certificate Decoder
Paste a PEM certificate to decode Subject, Issuer, validity dates, SANs, key algorithm, and all extensions — parsed entirely in your browser.
- Full X.509 field decode
- SANs & extensions
- Days-remaining countdown
CORS Policy Tester
Test real CORS behaviour for any URL. Sends a simple request and an OPTIONS preflight, then shows every CORS header returned and a plain-English verdict.
- Simple + preflight test
- Allowed / blocked / open verdict
- Full header dump
CVSS Score Calculator
Calculate a CVSS v3.1 Base Score by selecting the 8 metric values — Attack Vector, Complexity, Privileges, Scope, CIA Impact. Severity badge and vector string included.
- All 8 CVSS v3.1 metrics
- Severity badge (None → Critical)
- Copy vector string
Bcrypt Hash Generator
Generate bcrypt hashes with configurable cost factors (4–14), or verify a plaintext string against an existing hash. All computation runs in your browser.
- Cost factor 4–14
- Hash + verify modes
- Hash anatomy explainer
Security Headers Grader
Grade any site's HTTP security headers from A+ to F. Tests HSTS, CSP, X-Frame-Options, Referrer-Policy, Permissions-Policy, COOP, and CORP with per-header recommendations.
- A+–F grade with score
- Per-header recommendations
- All response headers dump
Code Formatter
Beautify or minify JSON, HTML, JavaScript, CSS, SQL, XML, and PHP. Syntax errors highlighted.
- 7 languages supported
- Beautify & minify
- Syntax validation
Line Break Converter
Detect and convert line endings between LF (Unix), CRLF (Windows), and CR (legacy Mac).
- Auto-detects mixed endings
- LF / CRLF / CR output
- Copy or download
Secure .env Generator
Generate cryptographically secure secrets for .env files with configurable length and encoding.
- CSPRNG secrets
- Hex / Base64 / alphanumeric
- Download .env
Regex Tester
Test regular expressions against text with live match highlighting, group extraction, and flags.
- Live match highlighting
- Capture groups
- Global / multiline flags
Live HTML Viewer
Write HTML and preview it in Desktop and Mobile simultaneously with proportional scroll sync.
- Dual-pane preview
- Desktop + mobile
- Scroll sync
Cron Expression Builder
Build and validate cron expressions visually. Presets, per-field editor, human-readable description, and next-10-runs preview.
- Presets & field editor
- Human-readable description
- Next 10 run times
JSON Schema Validator
Validate JSON documents against a JSON Schema. Supports Draft-07 — not Draft-2020-12. Path-specific error messages, sample schemas, runs in browser.
- Draft-07 (not 2020-12)
- Path-specific errors
- Sample schema & data
Text Diff Checker
Compare two text blocks line by line. Added, removed, and unchanged lines highlighted. Myers diff algorithm. Download .diff.
- Myers diff algorithm
- Ignore case / whitespace
- Download .diff
Base64 Encoder / Decoder
Encode text or files to Base64, or decode Base64 back. Standard and URL-safe variants. File mode supports any file type.
- Text & file modes
- Standard & URL-safe
- Copy data URI
URL Encoder / Decoder
Encode and decode URLs and URL components. Handles percent-encoding, query strings, full URLs, and includes a character reference table.
- Component / Full URL / Query modes
- Percent-encoding reference
- Swap & copy
HTTP Status Reference
Searchable, filterable reference for all HTTP 1xx–5xx status codes with plain-English descriptions, RFC links, and use-case notes.
- All 1xx–5xx codes
- Search by code / name
- RFC reference
Webhook Inspector
Paste a raw webhook payload to format, inspect and debug it. HMAC-SHA256 signature verifier, dot-path field extractor (e.g. data.user.email), and cURL builder.
- HMAC-SHA256 signature verify
- Extract any field (data.user.email)
- Copy cURL command
UUID Generator
Generate UUID v4, v7, and v1-style identifiers in your browser. Bulk-generate up to 1000 UUIDs, copy or download. Includes structure diagrams.
- v4 / v7 / v1-style
- Bulk up to 1000
- Copy or download .txt
IP Address Lookup
Look up geolocation, ISP, timezone, and network details for any IP address — or auto-detect your own public IP.
- Auto-detect my IP
- City / region / ASN
- Open in Google Maps
Binary / Hex Converter
Convert numbers and text between binary, hex, decimal, and octal instantly. See binary digit breakdown per byte, ASCII table, and hex-to-text decoder.
- Binary/Hex/Dec/Oct
- See binary breakdown per byte
- ASCII reference table
Robots.txt Generator
Build a valid robots.txt visually. Add user-agent rules, Disallow/Allow paths, crawl-delay, and sitemap URL. Includes AI-bot blocking preset.
- Block AI crawlers preset
- Sitemap support
- Download robots.txt
.htaccess Builder
Generate Apache .htaccess directives with toggles. Force HTTPS, GZIP, browser caching, CORS, hotlink protection, custom 404, and security headers.
- Force HTTPS + www
- GZIP & caching
- Security headers
JSONPath Tester
Test JSONPath expressions against any JSON document live. Supports wildcards, recursive descent, array slices, and filter expressions. Highlights matched paths.
- Wildcard, filter & recursive queries
- Live match highlighting
- 3 sample datasets
XML Sitemap Generator
Build a valid XML sitemap from a list of URLs. Set priority and change-frequency globally or per URL, add a lastmod date, and download sitemap.xml.
- URL validation
- Homepage priority boost
- Download sitemap.xml
Number Formatter
Format numbers for any locale and use case. 25+ locale presets, decimal / currency / percent / scientific / compact / accounting styles. Includes JS code snippet.
- 25+ locale presets
- 6 format styles
- JS Intl.NumberFormat snippet
Schema Markup Generator
Generate JSON-LD structured data for Article, FAQ, Product, Local Business, Breadcrumb, How-To, Event, and Person schema types. Copy ready-to-paste markup.
- 8 schema types
- Copy with <script> tag
- Google Rich Results link
Incident Response Writer
Generate a professional incident report from structured inputs. Fill in details, timeline, impact, and follow-up actions — export as Markdown instantly.
- MTTD / MTTR auto-calculated
- Event timeline builder
- Markdown + .md download
RCA Generator
Build a structured Root Cause Analysis with 5-Why chain, contributing factors (People/Process/Tech/Environment), corrective actions, and lessons learned.
- 5-Why analysis chain
- P/P/T/E contributing factors
- Blameless RCA report
Viewport & Screen Inspector
Instantly see your viewport size, DPR, screen resolution, orientation, touch points, CPU cores, and more — all detected automatically on page load.
- Live resize updates
- Device pixel ratio + physical px
- Connection, memory & CPU info
Uptime SLA Calculator
Convert any SLA percentage into real downtime — per day, week, month, and year. Instant tier badge (two nines through five nines) and a reference table.
- Day/week/month/year downtime
- Tier badge (2 nines → 5 nines)
- SLA reference table
API Rate Limit Calculator
Check whether your API traffic fits within a rate limit. Normalises any limit and traffic window to RPS and shows usage %, headroom, and an alert threshold.
- Any time-window normalisation
- Usage % + headroom
- Alert at 80/85/90%
Website Speed Test
Test any URL for Core Web Vitals — LCP, FCP, CLS, TBT — with desktop and mobile Lighthouse scores plus actionable insights. Powered by Google PageSpeed Insights.
- Desktop & mobile scores
- LCP, FCP, CLS, TBT metrics
- Actionable insights
Docker Image Size Estimator
Estimate your Docker image's compressed and uncompressed size. Pick a base image, add layers, and see a per-layer breakdown with a size-tier assessment.
- 20+ base image presets
- Per-layer breakdown
- Compressed vs uncompressed
AI Token Counter
Count tokens for GPT-4o, Claude, Gemini, Llama, and Mistral using model-specific heuristics. See context window usage, tokens remaining, and estimated API cost.
- 9 model presets
- Context window bar
- Cost estimate
LLM API Cost Estimator
Compare API costs for 17 LLMs side by side. Enter input/output tokens per call and daily volume for a monthly cost projection sorted cheapest-first.
- 17 model pricing table
- Monthly cost projection
- Best-value callout
AI Prompt Length Checker
Check if your prompt fits within a model's context window. Set reserved output tokens and get a clear green/amber/red status with a stacked usage bar.
- All major models
- Reserved-output slider
- Green/amber/red status
AI Model Context Reference
Searchable, sortable table of context windows, pricing, and notes for 35+ LLMs — GPT-4, Claude, Gemini, Llama, Mistral, Grok, and more. Data updated May 2025.
- 35+ models
- Sort by price or context
- Provider filter
📊 Data & Files
5 toolsJSON to CSV Converter
Convert any JSON array to a clean CSV file. Auto-detects keys as headers. Preview before download.
- Auto-detect headers
- Preview table
- Download CSV
Bulk CSV Anonymizer
Replace names, emails, and phones in CSV files with safe placeholders. Same name always gets the same placeholder — preserving relational consistency.
- Auto-detects PII columns
- Same name → same placeholder ID
- Download clean CSV
Universal Unit Converter
Convert length, area, weight, temperature, digital storage, speed, time, pressure, and energy.
- 10 unit categories
- 1024 vs 1000 digital base
- Quick-pick shortcuts
QR Code Generator
Create QR codes for URLs, WiFi, vCards, and UPI. 4 styles, custom colours, branded PNG download.
- URL / WiFi / vCard / UPI
- 4 visual styles
- Custom colour + download
Privacy Metadata Stripper
Remove GPS, camera model, timestamps, and all EXIF metadata from images. Batch-process multiple files.
- GPS & EXIF removal
- Batch file support
- Runs in browser only
Email Readability Analyser
Score your email copy for Flesch reading ease, spam triggers, and subject-line length.
- Flesch reading score
- Spam keyword check
- Subject line analysis
Markdown Preview
Live split-pane Markdown editor with real-time preview. Supports GFM — tables, task lists, fenced code, strikethrough.
- GitHub Flavored Markdown
- Toggle dark/light preview
- Copy HTML / Download .md
Markdown → LinkedIn Post
Convert Markdown to LinkedIn's vertical plain-text format. Unicode bold, bullets, hashtags.
- Unicode bold headings
- Emoji bullets
- 3,000 char limit check
Citation Builder
Generate APA, MLA, Chicago, and IEEE citations for books, journals, websites, and videos.
- APA / MLA / Chicago / IEEE
- Copy HTML with italics
- 5 source types
Table → WhatsApp Formatter
Paste a table from Excel or Google Sheets and get a clean text table for WhatsApp, Telegram, or Slack. Output styles: plain, markdown, monospaced, or bullets.
- Plain / Markdown / Mono / Bullets
- Excel & Google Sheets paste
- Code-block wrapper
Email Warmup Plan Generator
Generate a day-by-day cold email warmup schedule. Ramp up sending volume safely to build domain reputation and avoid the spam folder.
- Conservative / Moderate / Aggressive ramp
- CSV export
- Cold email best practices
Word Counter
Count words, characters, sentences, paragraphs, and reading time as you type. Keyword density, top-word frequency, and Flesch readability score.
- Reading & speak time
- Keyword density
- Limit checker
Lorem Ipsum Generator
Generate classic Latin, developer slang, corporate buzzword, or emoji placeholder text by paragraphs, sentences, or word count. Copy HTML or plain text.
- 4 text variants
- Copy plain or HTML
- Stats: words, chars
Text Case Converter
Convert text between 12 formats simultaneously — camelCase, PascalCase, snake_case, kebab-case, UPPER_SNAKE, Title Case, dot.case, and more. Hover to copy any.
- 12 formats at once
- Auto-detects separators
- Hover-to-copy any result
Privacy Policy Generator
Generate a free, customisable privacy policy for your website. Covers GDPR, CCPA, cookies, Google Analytics, and third-party services. Download instantly.
- GDPR + CCPA sections
- Third-party service clauses
- Download .txt
Terms & Conditions Generator
Generate free terms and conditions for your website, SaaS, or online store. Covers acceptable use, IP, liability, governing law, and more.
- SaaS / e-commerce / blog types
- Refund + subscription clauses
- Download .txt
Google SERP Preview
Preview how your page looks in Google search results. Check title pixel length, meta description truncation, and URL breadcrumb — desktop and mobile views.
- Live desktop + mobile preview
- Title & description length check
- Click-worthy snippet tips
Reading Time Estimator
Estimate reading time and speaking time for any text. Adjustable WPM slider, Flesch Reading Ease score, grade level, and readability improvement tips.
- Adjustable reading speed
- Flesch reading ease
- Grade level & tips
Open Graph Tag Generator
Generate complete Open Graph and Twitter Card meta tags. Fill in title, description, image URL, page type, and copy the ready-to-paste HTML markup instantly.
- OG + Twitter Card tags
- Social card preview
- Validation hints
Loan Payoff Visualizer
Calculate monthly payments, total interest, and amortization schedule for any loan. See the impact of extra payments.
- Amortization chart
- Extra payment savings
- Full schedule table
Tax Quick-Slip 🇺🇸
Estimate US federal income tax, effective tax rate, and take-home pay using 2024 bracket data. US only — based on IRS brackets.
- 2024 IRS tax brackets
- Marginal vs effective rate
- 401(k) pre-tax deductions
Grade-Curve Simulator 🎓
Apply square-root, flat boost, or custom curve to exam scores. See grade distribution and download results as CSV. For teachers and instructors.
- 5 curve methods
- Letter grade distribution
- Download CSV
Timezone Converter
Convert any date and time across the world's timezones. Live world clock for 12 major cities. Uses Intl.DateTimeFormat.
- Live world clock
- Any-to-any conversion
- Day/night indicators
Pomodoro Timer
Focused work timer with configurable 25/5/15-minute Pomodoro cycles. Session counter, audio chime, desktop notifications, and streak tracking.
- Configurable durations
- Desktop notifications
- Session streak
Invoice Generator
Create professional invoices in your browser. Add line items, discounts, tax, and currencies. Download as PDF with one click — no account needed.
- PDF download (print-to-PDF)
- 8 currencies + tax + discount
- Sample data loader
VAT / GST Calculator
Add or remove VAT and GST from any amount in one click. Choose Add Tax or Remove Tax mode, pick a preset rate, and get net, tax, and gross total instantly.
- Add & remove (reverse) mode
- 5 rate presets
- Copy results to clipboard
Compound Interest Calculator
See how compound interest grows your savings or investment over time. Set compounding frequency, add regular contributions, and get a year-by-year growth chart.
- Daily to annual compounding
- Regular contribution support
- Year-by-year chart
SaaS MRR / ARR Calculator
Calculate MRR, ARR, ARPU, and churn impact across multiple pricing tiers. Model up to 8 plans, set a monthly churn rate, and see net revenue after attrition.
- Multi-tier plan builder
- Churn impact & net MRR
- ARPU & revenue mix table
CSS Button Generator
Design production-ready CSS buttons with gradients, shadows, and hover effects. Live preview.
- Gradient & shadow controls
- Hover animation
- Copy CSS
Color Palette Picker
Generate shades, complementary, analogous, and triadic palettes from any hex colour.
- Shades + tints
- Complementary / triadic
- HEX / RGB / HSL copy
Color Contrast Checker
Check foreground/background color pairs for WCAG 2.1 AA and AAA compliance. Get the contrast ratio with suggestions for fixing failures.
- WCAG AA & AAA
- Live preview
- Auto-fix suggestions
OpenGraph & Meta Inspector
Inspect any URL to see its live OG tags and social card previews — or build your own. Fetches real og:title, og:image, twitter:card, and all meta tags.
- Inspect any live URL
- 4 social card previews
- Full raw tags table
Favicon Generator
Create a favicon from text or emoji. Choose background colour, shape, and font weight. Download as PNG at 16–512 px.
- Text & emoji support
- Rounded / circle shapes
- Download all sizes
Image Format Converter
Convert images between JPG, PNG, WebP, BMP, and GIF. Resize, adjust quality, and download.
- JPG / PNG / WebP / BMP
- Quality slider
- Download + Share
SVG Optimizer
Remove Inkscape/Illustrator metadata, empty groups, comments, and whitespace from SVG files. Preview before download.
- 9 optimisation passes
- Before/after size
- Live preview
PDF Permission Unlocker
Remove owner-level printing, copying, and editing restrictions from PDFs without a password.
- No password needed
- Shows restriction flags
- Download unlocked
Aspect Ratio Calculator
Calculate missing width or height from an aspect ratio. Scale proportionally, pick from presets (16:9, 4:3, 9:16, 1.91:1), and preview the result visually.
- 16:9 / 4:3 / 9:16 presets
- Scale slider
- Megapixel count
CSS Gradient Generator
Build beautiful CSS gradients visually. Linear, radial, and conic types with unlimited colour stops, angle control, and position tuning. Copy the CSS or export.
- Linear / Radial / Conic
- Unlimited stops + presets
- Copy background: CSS