Web & Utility
SEO tools, email utilities, social media helpers, browser info, and more
Web and utility tools are the odd jobs of the internet — quick lookups, generators, validators, and previewers that fall between the cracks of the main categories. Favtoo gathers them here so they have a stable home and a stable URL, instead of being buried under the tenth ad of a Google result.
Each tool runs in your browser, so you can paste private URLs, internal email lists, or campaign copy without it landing on someone else's server. Generated assets (QR codes, slugs, JSON-LD snippets) are produced client-side and downloaded directly from your tab.
Where a tool relies on a public dataset (browser info, IP-style lookups), the data source and refresh cadence is described in the tool's FAQ. Pair these with the developer and text categories for a full pipeline of inspect → clean → publish workflows.
JSON to CSV
Convert a JSON array to CSV format.
Excel to CSV
Convert Excel spreadsheets (.xlsx) to CSV format.
Hash Generator
Generate MD5, SHA-1, SHA-256, and SHA-512 hashes.
JWT Decoder
Decode and inspect JSON Web Tokens.
Password Strength Checker
Check how strong your password is with detailed feedback.
CSS Minifier
Minify CSS to reduce file size.
Meta Tag Generator
Generate HTML meta tags for SEO and social sharing.
Robots.txt Generator
Generate a robots.txt file for your website.
.htaccess Generator
Generate Apache .htaccess files for redirects, caching, and security.
Open Graph Preview
Preview how your page looks when shared on social media.
Browser Info
Browser Info Detector
Generate a JavaScript snippet that detects browser, platform, language, hardware, and connection info.
User-Agent Generator
Generate realistic User-Agent strings for Chrome, Firefox, Safari, Edge, Opera, and Googlebot on any OS.
Screen Resolution Checker
Generate a JavaScript snippet to detect screen resolution, available area, DPI, and display category.
Viewport Size Checker
Generate a JavaScript snippet to detect viewport dimensions, scroll position, and Tailwind CSS breakpoint.
Device Pixel Ratio Checker
Generate a JavaScript snippet to detect device pixel ratio, physical vs CSS pixels, and image scale recommendations.
Color Depth Checker
Generate a JavaScript snippet to detect color depth, HDR support, color gamut, and contrast preferences.
Browser Feature Detector
Generate a JavaScript snippet that checks 30+ browser API features including WebGL, Workers, WebRTC, and more.
Geolocation Tester
Generate a JavaScript snippet that requests and displays browser geolocation data with coordinates and accuracy.
Microphone Tester
Generate a JavaScript snippet to test microphone access, audio track details, and settings in the browser.
Camera Tester
Generate a JavaScript snippet to test camera access with resolution, frame rate, and facing mode detection.
Battery Status
Generate a JavaScript snippet to check battery level, charging status, and estimated time remaining.
Network Status Checker
Generate a JavaScript snippet to check online/offline status, connection type, downlink speed, and RTT.
WebGL Detector
Generate a JavaScript snippet to detect WebGL 1 & 2 support, GPU vendor, renderer, and capabilities.
Canvas Fingerprint Viewer
Generate a JavaScript snippet to view your browser canvas fingerprint hash for privacy research.
Do Not Track Checker
Generate a JavaScript snippet to check if Do Not Track (DNT) and Global Privacy Control (GPC) are enabled.
Ad Blocker Detector
Generate a JavaScript snippet to detect if an ad blocker is active using bait element and fetch methods.
Browser Storage
Cookie Viewer
Parse and inspect cookie data from JSON or key=value format with value decoding and size analysis.
localStorage Viewer
Parse and inspect localStorage data exported as JSON with type detection and storage quota analysis.
sessionStorage Viewer
Parse and inspect sessionStorage data exported as JSON with type detection and size analysis.
IndexedDB Viewer
Parse and display IndexedDB data exported as JSON with object store listing and record preview.
Browser Support
Web Font Detector
Generate a JavaScript snippet that detects installed system fonts and loaded web fonts on the current page.
CSS Support Checker
Generate a JavaScript snippet that tests 30 CSS features using CSS.supports() including Grid, Container Queries, and more.
JS Support Checker
Generate a JavaScript snippet that tests 30 JavaScript features from ES6 to latest proposals.
Css Generators
Design Generators
Glassmorphism Generator
Generate CSS glassmorphism effects with customizable blur, opacity, border, and shadow properties.
Neumorphism Generator
Generate CSS neumorphism (soft UI) effects with flat, concave, convex, and pressed shapes.
Clip Path Generator
Generate CSS clip-path shapes including polygons, circles, ellipses, and inset with copy-ready code.
SVG Divider Generator
Generate SVG section dividers with wave, triangle, curve, tilt, zigzag, and arrow styles.
CSS Pattern Generator
Generate CSS background patterns — dots, stripes, diagonals, grids, checkerboards, zigzags, and crosses.
Noise Texture Generator
Generate SVG noise textures using feTurbulence for subtle grain effects on backgrounds.
Logo Placeholder Generator
Generate SVG logo placeholders with initials in circle, square, or rounded shapes with custom colors.
Wireframe Grid Generator
Generate CSS Grid or Tailwind grid layouts with customizable columns, gutters, and max width.
Skeleton Loader Generator
Generate HTML/CSS skeleton loading screens for cards, lists, profiles, articles, tables, and galleries.
Developer Tools
Document Generators
Label Generator
Generate formatted address, shipping, or product labels ready for printing.
Badge Generator
Generate name badges for events, conferences, or meetings with customizable layout.
Certificate Generator
Generate formatted certificates of completion, achievement, or appreciation with custom text.
ID Card Generator
Generate formatted ID card layouts with name, title, department, and ID number fields.
Voucher Generator
Generate gift vouchers and discount coupons with custom amount, code, and expiry date.
Ticket Generator
Generate event tickets with name, date, venue, seat, and barcode placeholder.
Letterhead Generator
Generate professional letterhead templates with company name, address, and contact info.
Business Letter Template
Generate properly formatted business letters with sender, recipient, date, and body sections.
Report Template Generator
Generate structured report templates with title page, sections, and formatting for various report types.
Table of Contents Generator
Generate a formatted table of contents from headings with page numbers and dot leaders.
Page Number Adder
Generate page number formatting strings for headers or footers in various positions and styles.
Watermark Generator (Document)
Generate CSS-based text watermarks for documents — DRAFT, CONFIDENTIAL, or custom text.
Email Validator
Validate email address format against RFC 5322 with local part and domain analysis.
Disposable Email Checker
Check if an email address uses a known disposable or temporary email service from a list of 100+ providers.
Email Header Analyzer
Parse raw email headers and explain each field including routing, authentication, and spam indicators.
Email Subject Line Tester
Score an email subject line based on length, spam triggers, capitalization, emoji usage, and engagement signals.
Email Preview Generator
Preview how an email appears in an inbox with sender name, subject, and preview text on desktop and mobile.
SPF Record Generator
Generate an SPF DNS TXT record with IPv4, IPv6, include, and MX directives and policy selection.
DKIM Record Generator
Generate a DKIM DNS TXT record with selector, domain, key type, and public key configuration.
DMARC Record Generator
Generate a DMARC DNS TXT record with policy, subdomain policy, report URIs, and percentage settings.
Email Template Generator
Generate responsive HTML email templates for welcome, newsletter, receipt, password reset, and notification emails.
Mailto Link Generator
Generate a properly encoded mailto: URL with to, CC, BCC, subject, and body fields.
Email Extractor
Extract all email addresses from any text with deduplication and domain statistics.
Email Analytics
Bounce Rate Calculator
Calculate email bounce rate from sent, bounced, hard bounce, and soft bounce counts with delivery analysis.
Email Open Rate Calculator
Calculate email open rate from delivered and opened counts with engagement rating and opens-per-opener metric.
Email Click Rate Calculator
Calculate email click-through rate (CTR) and click-to-open rate (CTOR) with engagement rating.
Email Marketing
Email Signature Generator
Generate a professional HTML email signature with name, title, company, contact details, and accent color.
Newsletter Preview
Render markdown-style newsletter content as formatted HTML with headings, links, lists, and emphasis.
Unsubscribe Header Generator
Generate List-Unsubscribe and List-Unsubscribe-Post headers for RFC 8058 one-click unsubscribe compliance.
File Tools
File Type Detector
Detect file types from hex bytes or base64 content by matching file signature (magic bytes).
File Metadata Viewer
View file metadata including MIME type, size, extension, and content type from filename and properties.
JSON File Viewer
Format, validate, and inspect JSON with customizable indentation and structure analysis.
CSV File Viewer
View CSV files as formatted tables with support for comma, tab, semicolon, and pipe delimiters.
XML File Viewer
Format and indent XML with proper nesting visualization and tag counting.
Diff Compare Two Files
Compare two texts side by side with line-by-line diff showing additions, removals, and changes.
File Encoding Detector
Detect text file encoding — UTF-8, ASCII, UTF-16, ISO-8859-1, and BOM presence.
Text File Encoding Converter
Convert text between Unicode escapes, hex bytes, HTML entities, and back with encoding/decoding.
Line Ending Converter
Detect and convert line endings between LF (Unix), CRLF (Windows), and CR (Classic Mac).
BOM Detector & Remover
Detect, remove, or add UTF-8 Byte Order Mark (BOM) in text content.
File Splitter
Split text content into multiple parts by line count, character count, or custom delimiter.
File Merger
Combine multiple plain text files with optional separators, headers, and custom ordering.
ZIP File Inspector
Upload a ZIP archive and list every entry with compressed size, uncompressed size, and path.
Base64 File Encoder
Encode any small file to Base64 or a data URL for embedding in HTML, CSS, or JSON.
Base64 File Decoder
Decode Base64 or data URL text back into a downloadable file with the correct MIME type.
File to Data URL
Convert an uploaded file into a data URL string ready for HTML, Markdown, or configuration snippets.
Data URL to File
Turn a pasted data URL into a real downloadable file with MIME detection and custom naming.
Jwt
Legal
Terms of Service Generator
Generate terms of service templates with placeholders for jurisdiction, liability caps, and acceptable use sections.
Privacy Policy Generator
Generate privacy policy templates with data categories, retention, subprocessors, and rights request placeholders.
Cookie Policy Generator
Generate cookie policy templates with essential, analytics, and marketing categories plus consent banner notes.
GDPR Consent Form Generator
Generate GDPR-style consent form templates with lawful basis notes, withdrawal instructions, and DPO placeholders.
Disclaimer Generator
Generate disclaimer templates for informational sites, tools, health content, and affiliate link disclosures.
NDA Generator
Generate mutual and one-way NDA templates with definitions, exclusions, term, and injunctive relief placeholders.
Bill of Sale Generator
Generate bill of sale templates for vehicles, electronics, or general goods with as-is and witness placeholders.
Number Tools
Number Formatter
Format integers and decimals with grouping, locales, currency style, and significant figures.
Large Number Calculator
Add, subtract, multiply, and divide very large integers using arbitrary-precision decimal strings.
Fibonacci Generator
Generate Fibonacci numbers or the sequence up to N terms with copy-friendly plaintext output.
Prime Number Generator
List primes in a numeric range using efficient sieving with progress for medium-sized bounds.
Number Sorter
Paste a list of numbers and sort them ascending or descending with flexible separators and blank-line handling.
Number Deduplicator
Remove duplicate numbers from pasted lists while preserving first-seen order or sorting for review.
Average Calculator
Calculate mean, median, and mode for pasted numbers with counts, frequency tables, and outlier notes.
Print CSS Generator
Generate @media print CSS rules for margins, page breaks, hidden elements, and print-friendly styling.
A4/Letter Size Reference
Quick reference for A4, Letter, Legal, and other paper sizes in mm, inches, and points.
Paper Size Converter
Convert between paper size units: millimeters, inches, points, and pixels at any DPI.
Bleed & Safe Zone Calculator
Calculate bleed, trim, and safe-zone dimensions for print-ready artwork.
Print Cost Estimator
Estimate printing costs based on page count, color mode, paper type, quantity, and binding.
Productivity
To-Do List Generator
Generate reusable to-do list templates with sections for priorities, due hints, and daily check-ins.
Meeting Agenda Generator
Generate meeting agenda templates with goals, timeboxed topics, owners, and pre-read links placeholders.
Meeting Notes Template
Generate meeting notes templates with attendees, decisions, action items, and link-back sections.
Resume Template Generator
Generate resume templates with summary, skills, experience, and education blocks ready to personalize.
Cover Letter Generator
Generate cover letter templates with hook, value proof, and closing paragraphs you can personalize per role.
Business Card Generator
Generate business card layout templates with safe margins, bleed notes, and front-back placeholders.
QR Code Business Card
Generate QR-ready vCard strings and compact contact payloads for digital business cards and NFC tags.
Barcode Label Generator
Generate barcode label templates with Code 128 placeholders, human-readable text, and quantity tables.
Name Badge Generator
Generate name badge layouts with titles, pronouns, QR check-in placeholders, and event branding notes.
Poll & Survey Generator
Generate poll and survey HTML snippets with radio groups, scales, and consent text placeholders.
Feedback Form Generator
Generate feedback form HTML with ratings, free-text prompts, and optional anonymous submission reminders.
Contact Form Generator
Generate contact form HTML with name, email, message fields, honeypot notes, and consent checkboxes.
Random
Dice Roller
Roll standard polyhedral dice with modifiers, advantage/disadvantage, and roll history.
Coin Flipper
Flip a fair or weighted virtual coin with streak stats and optional best-of series.
Lottery Number Generator
Draw unique random numbers within a min/max range with ticket-style formatting.
Lucky Number Generator
Generate culturally lucky digits, sequences, or charm-style numbers for fun rituals.
Random Team Generator
Randomly split a pasted list of people into balanced teams with shuffle seeds and team name labels.
Random Group Maker
Randomly assign people to labeled groups with size targets, gender or role hints as plain text notes only.
Seating Chart Generator
Generate random seating charts for tables or grids with aisle notes, VIP spacing, and printable layouts.
Bracket Tournament Generator
Generate single-elimination tournament brackets from a list of team or player names.
Decision Maker Wheel
Spin a virtual wheel to randomly pick one option from your list of choices.
Yes/No Randomizer
Get a random Yes or No answer with optional probability weighting.
Magic 8-Ball
Ask a question and receive a random response from the classic Magic 8-Ball answer set.
Word of the Day
Get a random interesting word with its definition, pronunciation guide, and example sentence.
Quote Generator
Generate random inspirational, funny, or philosophical quotes from a curated collection.
Tip of the Day
Get a random productivity, coding, design, or life tip from a curated collection.
Readers
Reference
Security
CSP Header Validator
Parse and validate Content-Security-Policy headers with directive analysis and security warnings.
Cookie Analyzer
Parse a Set-Cookie or Cookie header and display all attributes with security recommendations.
Session Token Generator
Generate cryptographically random session tokens in hex, base64, URL-safe, or alphanumeric formats.
TOTP Generator
Generate time-based one-time passwords (TOTP) from a Base32 secret with configurable digits and period.
Certificate Decoder
Parse PEM-encoded X.509 certificates and display subject, issuer, validity, serial number, and signature algorithm.
OWASP Top 10 Checklist
Generate a comprehensive OWASP Top 10 (2021) security checklist with actionable items for each category.
Web Security Checklist
Generate a web application security checklist covering HTTPS, auth, headers, sessions, data protection, and monitoring.
Firewall Rule Generator
Generate firewall rules for iptables, nftables, and UFW from IP, port, protocol, and action inputs.
Seo
Meta Tag Analyzer
Analyze HTML meta tags for SEO completeness — checks title, description, Open Graph, Twitter Cards, and more.
Open Graph Tag Generator
Generate Open Graph meta tags for social media sharing with customizable title, description, image, and type.
Open Graph Tag Previewer
Preview how Open Graph tags will render in social media card previews and identify missing properties.
Twitter Card Generator
Generate Twitter Card meta tags with card type, title, description, image, and creator attribution.
Twitter Card Previewer
Preview Twitter Card rendering from pasted meta tags and verify card type, title, and image properties.
Robots.txt Validator
Validate robots.txt syntax including directives, User-agent rules, Sitemap references, and Crawl-delay.
Sitemap XML Validator
Validate XML sitemap structure including URLs, lastmod dates, priority values, and changefreq entries.
Canonical URL Generator
Generate a canonical link tag with proper URL normalization, trailing slash control, and tracking param removal.
Hreflang Tag Generator
Generate hreflang link tags for multi-language websites with x-default support.
Schema Markup Generator
Generate JSON-LD structured data for Articles, Products, Local Business, FAQ, Events, and more.
Schema Markup Validator
Validate JSON-LD schema markup for correct structure, required properties, and schema.org compliance.
Seo Analysis
TF-IDF Calculator
Analyze term frequency and TF-IDF scores across text to identify the most significant keywords.
Readability Score (SEO)
Compute Flesch Reading Ease, Flesch-Kincaid Grade, Gunning Fog, and Coleman-Liau readability scores.
Page Title Length Checker
Check page title lengths against SEO best practices (50–60 chars) with pixel width estimation.
Meta Description Length Checker
Check meta description lengths against the recommended 120–160 character range for search snippets.
URL Slug Generator (SEO)
Convert page titles to SEO-friendly URL slugs with accent normalization and stop word removal.
SEO Checklist Generator
Generate a tailored SEO checklist for landing pages, blog posts, product pages, homepages, or local businesses.
Heading Tag Extractor
Extract and visualize the heading tag hierarchy (H1–H6) from HTML with SEO checks for structure.
Core Web Vitals Reference
Reference guide for Core Web Vitals (LCP, INP, CLS) thresholds, measurement tools, and optimization tips.
Social Media
LinkedIn Post Previewer
Preview and analyze LinkedIn posts with character count, hashtag analysis, and engagement tips.
Facebook Post Previewer
Analyze Facebook posts with character counts, engagement tips, and "see more" truncation preview.
Instagram Bio Generator
Generate Instagram bio suggestions in professional, casual, minimal, or creative styles from keywords.
Instagram Hashtag Generator
Generate relevant Instagram hashtag sets from your post topic with niche and general tags.
YouTube Video ID Extractor
Extract video IDs from YouTube URLs with embed code and thumbnail URLs for any format.
Twitter Thread Generator
Split long text into a Twitter/X thread with character limits, numbering, and smart sentence breaks.
Social Media Character Counter
Count characters against all social media platform limits with visual progress bars.
Social Media Image Sizes
Complete reference of optimal image sizes for Instagram, Twitter, Facebook, LinkedIn, YouTube, TikTok, and Pinterest.
Social Media Planner
Generate a social media content plan with best posting times, content types, and weekly schedule.
Hashtag Generator
Generate platform-optimized hashtag sets for Instagram, Twitter, TikTok, and LinkedIn from any topic.
Social Share URL Builder
Build share URLs for Twitter, Facebook, LinkedIn, Reddit, WhatsApp, Telegram, Pinterest, and email.
Tweet to Image
Convert tweet text into a styled HTML card with light, dark, or dim themes for screenshots.
Social Media Audit Checklist
Generate a comprehensive social media audit checklist for Instagram, Twitter, LinkedIn, TikTok, and Facebook.
Time Tools
World Clock
Compare the current time across multiple cities and UTC with daylight-saving awareness.
Countdown Timer
Set a target duration or deadline and run a fullscreen-friendly countdown with alerts.
Stopwatch
Start, lap, and stop a high-resolution stopwatch with lap table export for workouts or QA tests.
Pomodoro Timer
Classic Pomodoro workflow with work sessions, short breaks, long breaks, and session counters.
Meeting Timezone Planner
Pick attendee time zones and highlight civilized meeting windows that overlap business hours.
Calendar Generator
Generate printable monthly or yearly calendars with week-start preference and ISO week numbers.
Holiday Calculator
Compute business days between dates while skipping weekends and a configurable holiday list.
Lunar Calendar
View moon phases, illumination, and approximate lunation dates for any month you select.
UTC Offset Reference
Look up common UTC offsets with example cities, abbreviations, and relationship to UTC time.
DST Checker
See whether daylight saving time is active now for a region and when the next transition occurs.
Timezone Overlap Finder
Highlight hourly overlap across several time zones on a 24-hour strip with drag-friendly selection.
Typography
Spacing Scale Generator
Generate a consistent spacing scale using multiplier, Fibonacci, or power-of-2 methods for design systems.
Typography Scale Generator
Generate a modular typography scale using musical ratios like Major Third, Perfect Fourth, or Golden Ratio.
Font Pairing Tool
Get curated Google Fonts pairings for modern, classic, playful, technical, editorial, and minimal styles.
Google Fonts Preview
Generate CSS @import, HTML link, and sample code for any Google Font with weight previews.
Url
URL Validator
Validate URLs and parse their components — protocol, host, port, path, query, and hash with security warnings.
Query String Remover
Remove all query parameters or only tracking parameters (UTM, fbclid, gclid) from URLs.
UTM Builder
Build campaign URLs with UTM parameters — source, medium, campaign, term, and content tracking tags.
UTM Parser
Parse and extract UTM parameters from campaign URLs with a clean breakdown of each tag.
URL Canonicalizer
Normalize URLs by lowercasing hosts, sorting query params, removing default ports and trailing slashes.
Relative to Absolute URL
Convert between relative and absolute URLs by resolving paths against a base URL.
URL Comparison Tool
Compare two URLs component-by-component — protocol, host, path, query, and hash with semantic matching.
URL to QR Code
Generate a real, scannable QR code PNG from any URL — runs entirely in your browser.
Punycode Encoder / Decoder
Encode Unicode domain names to Punycode (ACE) and decode Punycode back to Unicode.
IDN Domain Converter
Convert internationalized domain names (IDN) to ASCII-compatible form and back.
URL Slug Converter
Convert any text or title into a clean, URL-friendly slug with diacritics removal and normalization.