Free Online Tools
Powerful, privacy-first tools for developers, marketers, and business owners. All tools run 100% in your browser — no signup, no data uploaded.
38 tools available — more coming soonDevelopment Tools
5 toolsHTML Minifier & Beautifier
Minify or beautify HTML with 10-step optimization. Remove comments, whitespace, optional tags, and more.
FreeCSS Minifier & Beautifier
Minify or beautify CSS. Shortens hex colors, compresses shorthand, removes vendor prefixes. 3 presets.
FreeJS Minifier & Beautifier
Minify or beautify JavaScript with a full tokenizer. Removes console logs, shortens booleans. 3 presets.
FreeJSON Formatter & Validator
Format, minify, and validate JSON. Interactive tree view, auto-repair, JSONC support.
FreeJSON Validator, Schema & Diff
Validate JSON with multi-error detection. Generate schemas, compare two JSON objects side-by-side.
FreeEncoders & Decoders
4 toolsServer & Network
4 tools.htaccess Generator
Generate Apache .htaccess with 8 modules: redirects, security headers, caching, CORS, URL rewriting. 6 presets.
FreeHTTP Header Checker
Analyze security, performance, and SEO headers with A+ to F grading. Fix code for Apache, Nginx, IIS, Cloudflare.
FreeIP Address Lookup
Find geolocation, ISP, timezone, ASN, and VPN/proxy status for any IP. Interactive map, bulk lookup, CSV export.
FreeDNS Lookup
Query 10 DNS record types. Check propagation across 8 global resolvers. SPF/DKIM/DMARC email security analysis.
FreeSEO & Marketing
16 toolsSERP Snippet Preview
Preview how your page appears in Google search results. Pixel-accurate title and description check with desktop and mobile views.
FreeMeta Tag Generator
Generate complete HTML meta tags for SEO, Open Graph, and Twitter Cards. Live Google, Facebook, and Twitter preview.
FreeOpen Graph Previewer
Preview how your page appears when shared on Facebook, LinkedIn, Discord, Slack, and Twitter/X. Check OG tags across 5 platforms.
FreeKeyword Density Checker
Analyze keyword frequency and density for 1, 2, and 3-word phrases. Over-optimization warnings, stop word filtering, CSV export.
FreeReadability Checker
Analyze content readability with 6 formulas: Flesch-Kincaid, Gunning Fog, SMOG, Coleman-Liau, and ARI. Grade level scores and improvement suggestions.
FreeRobots.txt Generator
Visual robots.txt builder with User-agent blocks, Allow/Disallow rules, Crawl-delay, Sitemap URLs. 5 presets including AI crawler blocking.
FreeSitemap Generator
Generate valid XML sitemaps with URLs, priority, change frequency, and last modified dates. Sitemap index mode for large sites. Download ready-to-upload sitemap.xml.
FreeSchema Markup Generator
Generate JSON-LD structured data for Google Rich Results. Support for Article, FAQ, HowTo, LocalBusiness, Product, and 7 more schema types.
FreeHeading Structure Checker
Analyze H1-H6 heading hierarchy with a visual tree view. Detect missing H1, skipped levels, empty headings, and SEO issues instantly.
FreeTitle & Description Length Checker
Check title tag and meta description length in characters and pixels. Desktop and mobile truncation preview. Bulk check up to 20 pages with CSV export.
FreeRedirect Chain Checker
Analyze HTTP redirect chains from cURL output. Detect loops, long chains, protocol mismatches, and 301/302 issues with a visual chain and automated issue detection.
FreeHreflang Tag Generator
Generate hreflang tags for multilingual SEO. Validates ISO 639-1 language and ISO 3166-1 region codes. Outputs HTML, XML sitemap, and HTTP header formats with x-default.
FreeUTM Link Builder
Build UTM-tagged tracking URLs for Google Analytics and ad platforms. Single and bulk CSV modes, platform presets, save templates, character counter, CSV export.
FreeCanonical URL Checker
Analyze canonical tags from HTML source. Detect missing, multiple, or malformed canonicals. Protocol, www, and trailing-slash validation, plus side-by-side URL comparison.
FreeSitemap Validator
Validate XML sitemaps against the sitemaps.org spec. Checks loc, lastmod, priority, changefreq, 50K-URL and 50MB limits. Line-numbered errors and downloadable cleaned XML.
FreeRobots.txt Validator & Tester
Validate robots.txt syntax against RFC 9309 and test URL blocking for any user-agent. Longest-match-wins resolution, 16 common crawlers, batch tester, line-numbered errors.
FreeMarketing & Ads
9 toolsROI Calculator
Calculate marketing ROI, net profit, and break-even for any campaign. Compare multiple campaigns side-by-side with a live bar chart, currency selector, CSV export.
FreeAd Spend Calculator
Plan ad budgets with daily, weekly, monthly, annual projections. Calculate clicks, conversions, CPA, and ROAS from CPC + CTR. Platform presets, what-if budget slider, CSV export.
FreeA/B Test Calculator
Calculate required sample size, test duration, and statistical significance for A/B tests. One/two-tailed support, feasibility verdict, recommendations, shareable URL.
FreeAd Copy Generator
Generate 6 ad copy variants per platform (Google, Facebook, Instagram, LinkedIn, Twitter/X) from product, benefits, audience, and CTA. Live character counts, mock ad preview, CSV export.
FreeHeadline Analyzer
Score any headline 0−100 on emotional impact, power words, readability, and length. Word-balance breakdown, suggestions, 3-variant compare mode.
FreeEmail Subject Line Tester
Score subject lines for spam triggers (3 tiers), mobile truncation, personalisation tokens, emoji density. Live Gmail desktop, Gmail mobile, and iPhone Mail previews.
FreeCTA Generator
Generate 20+ call-to-action variations for buttons, headlines, and inline links. Seven psychological trigger categories: urgency, scarcity, curiosity, benefit, social proof, risk reversal, action verb.
FreeYouTube Thumbnail Downloader
Extract and download any YouTube video's thumbnail in all 5 resolutions — default, medium, high, standard, and HD maxresdefault. Works with watch links, youtu.be, Shorts, embeds, and live URLs.
FreeYouTube Tag Extractor
Extract every tag and keyword from any YouTube video by pasting its page source. Pulls from meta keywords, og:video:tag, and ytInitialPlayerResponse JSON. Bulk copy and CSV export for competitor research.
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