NEW48 Audit & Developer Tools • 100% Free

Audit what matters before you ship

Check Core Web Vitals, structured data, AMP, on-page SEO, HTTP/3, JWT decoding, CSP policies, and responsive viewports — powered by real Google Lighthouse engine with zero signups.

Run a Free Audit Explore 48 Tools

Free Tools

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vitalsaudit.com/core-web-vitals

Mobile

Lighthouse Live Audit

LIVE ENGINE

Performance

100

Accessibility

100

Best Practices

100

SEO

LCP1.2s✔ Good

INP38ms✔ Good

CLS0.01✔ Good

FCP0.7s✔ Good

Built on the same engine Google uses

No fabricated scores or estimates — every audit here runs a real Google Lighthouse instance server-side, the same tool behind PageSpeed Insights and Chrome DevTools.

100% Free, unlimited audits

No credit card, no account, no catch

Toolkit Directory

48 tools, one dashboard

Explore all auditing, developer, and design utilities or search by keyword below.

Showing 48 of 48 tools

Core Engine

Lighthouse Viewer

Run a live Lighthouse audit or upload a report to explore performance, accessibility, SEO and best-practice scores with real Core Web Vitals.

Structured Data

Schema Validator

Check a page's JSON-LD structured data for validity and preview rich snippets exactly as search engines parse them.

Mobile Speed

AMP Validator

Paste AMP markup or point at a live AMP page to catch validation errors and mobile format warnings before Google does.

On-Page Audit

SEO Analyzer

Audit a page's meta tags, headings, images, links, and OpenGraph social markup in one comprehensive scannable dashboard.

Core SEO

Google Index Checker

Check single or bulk URLs to verify search indexability, meta noindex tags, X-Robots headers, and robots.txt disallow status.

Core SEO

XML Sitemap Inspector

Parse and validate sitemap.xml files to extract listed URLs, lastmod dates, change frequencies, and XML health.

Core SEO

Keyword Density Checker

Analyze word count, n-gram phrase frequency distribution, and targeted keyword placement across title, headers, meta tags, and body content.

Core SEO

Long-Tail Keyword Generator

Expand seed keywords into high-intent long-tail phrases categorized by search intent, estimated difficulty score, and CPC.

Core SEO

Bulk Google Index Checker

Paste up to 50 URLs/domains to verify index status, HTTP response status, SSL certificate, and latency in a single batch report.

Security & DNS

Spam Score Checker

Audit domain spam risk percentage, toxic link patterns, missing trust signals, and outbound link ratios to protect search engine rankings.

Security & DNS

Domain Age Checker

Check domain creation date, total age in years/months/days, WHOIS expiry date, and registrar details for any domain.

Security & DNS

SSL Certificate Checker

Inspect a site's SSL/TLS certificate — issuer, expiry date, and trust chain — via a real TLS handshake.

Security & DNS

Redirect Checker

Follow a URL through every redirect hop and see each status code, destination, and any loops or downgrades.

Security & DNS

DNS Lookup

Look up A, AAAA, MX, TXT, CNAME, NS and SOA DNS records for any domain.

Security & DNS

Security Headers Checker

Check whether a site sends the HTTP response headers that protect against XSS, clickjacking and MIME-sniffing.

Security & DNS

Technology Lookup

Find out what CMS, JavaScript framework, analytics, CDN and other technologies a website uses.

Security & DNS

Share Debugger

See exactly how a URL will look when shared on Facebook, X (Twitter) or LinkedIn.

Security & DNS

HTTP/3 Checker

Check whether a site advertises HTTP/3 support via the Alt-Svc header, ALPN negotiation and DNS HTTPS records.

Design & Media

Robots.txt Generator

Generate valid robots.txt files with custom crawler directives, sitemap links, and AI bot blocking presets (GPTBot, ClaudeBot).

Design & Media

SERP Snippet Simulator

Preview how your page title and meta description appear on Google Search Desktop & Mobile results with live pixel meters.

Design & Media

Image Compressor

Compress, resize and convert images to JPEG, PNG or WebP — entirely in your browser, files never uploaded.

Design & Media

Favicon Generator

Generate every favicon size a site needs — 16×16 through 512×512 — from one image, entirely in your browser.

Design & Media

URL to Domain Extractor

Parse messy text or log files containing hundreds of URLs into clean, deduplicated root domain lists with 1-click export.

Developer

CSS & JS Minifier

Minify CSS or JavaScript in your browser — paste code, get a smaller output, nothing uploaded.

Design & Media

Color Contrast Checker

Check whether a text and background color pair meets WCAG AA/AAA contrast requirements.

Developer

JSON Viewer

Explore JSON as a collapsible, syntax-highlighted tree — validated as you go, entirely in your browser.

Developer

JSON Compare

Compare two JSON blobs and see exactly what was added, removed, or changed.

Developer

GitHub README Generator & Markdown Viewer

Build professional GitHub README.md files visually or preview, edit, and inspect markdown with live formatting.

Developer

JWT Token Debugger & Inspector

Decode, inspect, and validate JSON Web Tokens (JWT) with real-time claim countdowns and token structure breakdown.

Design & Media

Meta Tag & OpenGraph Studio

Generate search-optimized HTML meta tags, Facebook OpenGraph, and Twitter Cards with real-time live visual previews.

Developer

URL Encoder & Query Param Studio

Encode/decode URLs, percent-encoded parameters, and Base64 strings — or visually edit query strings and UTM tags in an interactive table.

Developer

HTML Formatter & Beautifier Studio

Clean, indent, and format messy HTML markup or compress code into production-ready minified HTML with real-time live preview.

Security & DNS

Content Security Policy (CSP) Studio

Build, customize, and audit Content-Security-Policy (CSP) headers with real-time security evaluation and Nginx/Apache export.

Developer

Responsive Viewport & Device Simulator

Test any website across real device dimensions (iPhone, Galaxy, iPad, MacBook, Desktop) with rotation and multi-device grid testing.

Security & DNS

HTTP Status Codes & SEO Guide

A complete searchable reference for all HTTP/1.1 and HTTP/2 response codes and their real-world search indexing impacts.

Design & Media

SVG Optimizer & Viewer Studio

Minify SVG code, strip editor metadata from Figma/Illustrator, round precision coordinates, and preview vector graphics.

Design & Media

Cron Expression Visualizer & Generator

Generate, debug, and translate cron schedules into plain English with real-time execution timestamps and code snippets.

Design & Media

Live Regex Tester & Debugger

Test, debug, and validate regular expressions in real-time with capture groups breakdown, flag toggles, and multi-language snippets.

Design & Media

UUID, ULID & Hash Generator

Generate cryptographically secure UUIDs (v4/v1), sortable ULIDs, compact NanoIDs, and SHA hashes in bulk.

Design & Media

Markdown & HTML Converter Studio

Dual-direction conversion between GitHub Flavored Markdown (GFM) and HTML with live split-screen preview.

Design & Media

CSS Box Shadow & Glassmorphism Studio

Design multi-layered smooth box shadows, ambient glows, and modern glassmorphism backdrop filters with CSS export.

Design & Media

Case Converter & Text Statistics Studio

Convert text between standard headline Title Case, developer casing formats (camelCase, snake_case, kebab-case), and word counts.

Design & Media

QR Code Generator & Studio

Generate customized scannable QR codes for websites, WiFi networks, vCards, and plain text with 100% client privacy.

Design & Media

Text & Code Diff Checker

Compare two text documents or code files side-by-side with visual addition/deletion highlights and line inspection.

Design & Media

CSV to JSON & JSON to CSV Studio

Convert spreadsheet CSV data into clean JSON arrays or export structured JSON records back to tabular CSV files.

Design & Media

SQL Formatter & Query Beautifier

Clean, indent, and format messy SQL queries across MySQL, PostgreSQL, SQLite, and BigQuery with keyword capitalization.

Design & Media

Base64 Image & File Studio

Convert images, fonts, and assets into Base64 Data URIs for inline HTML/CSS embedding or decode Base64 strings back into files.

Design & Media

Lorem Ipsum & Mock Data Studio

Generate customizable placeholder copy, HTML-formatted lists, and mock user JSON records for UI prototyping.

Why Us

Why Vitals Audit

Everything you need for complete web performance, indexability, security, and developer utilities.

Real Headless Chrome Audits

Every run drives a real Google Lighthouse instance in a cloud function — giving you authentic PageSpeed Insights metrics.

Headless Chrome engine
Real LCP, CLS, and TBT metrics

Indexing & Crawler Protection

Audit Google indexability, validate XML sitemaps, preview SERP snippets, and block AI scraper bots in one click.

Google index status checks
AI crawler blocking presets

100% Client-Side Privacy

Client tools (JWT Debugger, HTML Beautifier, Image Compressor, Favicon Generator, JSON Viewer) process everything in your browser.

Zero server file uploads
Complete data privacy

48 Free Developer Utilities

Core Web Vitals, structured data, AMP, meta tags, CSP, URL params, JWTs, HTTP/3, TLS, DNS, and responsive viewports.

48 tools, single dashboard
100% free with zero signups

How It Works

Run audits in three simple steps

No setup, no accounts, and no configuration required.

Enter any URL

Type or paste any publicly accessible web page URL. Choose between Mobile and Desktop emulation mode.

Google Chrome Audits Live

Our backend runs a real headless Chrome browser instance to measure real-world performance, SEO, and accessibility.

Get Instant Insights

Explore Core Web Vitals diagnostics, LCP/CLS element fixes, security headers, and actionable optimization insights.

FAQ

Frequently Asked Questions

Everything you need to know about our free tools and audits.

01.Is Vitals Audit really 100% free with unlimited audits?

Yes — all 48 tools on Vitals Audit are completely free with no registration, no account creation, and no credit card required. There are no hidden paywalls, daily usage caps, or locked premium features.

02.How does the Core Web Vitals audit work behind the scenes?

When you test any URL, our cloud backend provisions a real, headless Google Chrome instance running the official Google Lighthouse engine. It emulates standard mobile and desktop environments to measure Largest Contentful Paint (LCP), Interaction to Next Paint (INP), and Cumulative Layout Shift (CLS) with authentic PageSpeed accuracy.

03.What is the difference between Vitals Audit and Google PageSpeed Insights?

While Google PageSpeed Insights provides a single performance test, Vitals Audit gives you a complete 34-tool developer suite including interactive element diagnostics, structured data validator, AMP checker, JWT debugger, CSP header builder, live multi-device responsive tester, and instant client utilities with zero rate-limits.

04.Are my sensitive tokens, private code, or files uploaded to your servers?

No. All client utilities (such as JWT Debugger, URL Encoder/Decoder, HTML Beautifier, Image Compressor, JSON Viewer, and CSS/JS Minifiers) execute 100% locally in your browser using standard JavaScript APIs. No tokens, code snippets, or images are ever transmitted to or stored on our servers.

05.How does the Live Responsive Viewport Tester work?

The Responsive Tester lets you simultaneously test and preview any website across mobile (iPhone, Galaxy, Pixel), tablet (iPad, Surface), and desktop viewport sizes in real-time. It features interactive zoom controls, device rotation (portrait/landscape), and instant viewport preset switching.

06.Can I validate structured data and rich snippets (Schema.org JSON-LD)?

Yes. The Schema Validator tool audits live URLs or raw code snippets for JSON-LD, Microdata, and RDFa formats. It validates your markup against Schema.org and Google Rich Results guidelines, highlighting missing required attributes and syntax errors.

07.How does the Content Security Policy (CSP) Generator help secure websites?

The CSP Generator allows you to visually configure strict security directives (such as default-src, script-src, style-src, and connect-src), test against Cross-Site Scripting (XSS) and clickjacking vulnerabilities, and generate production-ready HTTP response headers or HTML meta tags.

08.Can I audit staging environments or local development servers (localhost)?

Yes. Client-side tools and validators that support direct code pasting or iframe rendering (such as Responsive Tester, JWT Debugger, HTML Beautifier, URL Encoder, Schema Validator, and Minifiers) work directly with localhost, private staging environments, and local files.

09.How often should I audit my website's Core Web Vitals?

We recommend testing before and after every major deployment or theme update. Regularly monitoring LCP, CLS, and INP ensures optimal search engine rankings in Google Search and prevents performance regressions that impact user conversions.

10.What is INP (Interaction to Next Paint) and how is it measured?

INP is Google's official Core Web Vital metric that replaced First Input Delay (FID). It measures page responsiveness by tracking the latency of all user interactions (clicks, taps, key presses) throughout the entire visit, ensuring your website feels instantaneous and lag-free.