Website and SEO health
Check status, crawl visibility, and discovery files when a page fails or is not indexed.
Chakan
Image editing, PDF merging, JSON validation, website checks, and everyday calculations.
Start with a task
Solve the task first, then go deeper
Website diagnostics, data validation, and traffic analysis.
Data and developer cleanup
Review JSON, CSV, and URL data before imports, integrations, and debugging handoffs.
Traffic and monetization
Use logs, search sources, and ad metrics to separate real use from noise and plan growth.
Featured
Muscle group explorer
Pick a muscle area to find useful exercises, or select an exercise to see its primary and secondary muscle activation.
Open toolMuscle mapHeat zonesExercise picksTraining notes
Recommended tools
Developer utilities, file processing, website checks, and everyday calculations.
JSON formatter
Use this json formatter tool to inspect, convert, or generate a clear result directly in your browser.
LookupToolChakanImage compressor
Compress an image locally with max-width and quality settings and inspect the size reduction.
LookupToolChakanPDF file merger
Merge multiple local PDF files in browser order and download a combined PDF without uploading the source files.
LookupToolChakanWorkday calculator
Count workdays, weekends, natural days, and manually excluded holidays between two dates.
LookupToolChakanDNS propagation checker
Compare DNS records across multiple public resolvers and check whether a target value has propagated.
LookupToolChakanInternal link analyzer
Inspect one page's internal links, anchor-text quality, repeated targets, nofollow usage, and navigation versus main-content link mix for search and AI crawler discovery.
LookupToolChakanCSV template validator
Compare CSV headers with an import template to find missing required headers, extra columns, duplicate headers, and uneven rows in the browser.
LookupToolChakanSQLite database table and schema viewer
Open SQLite, SQLite3, or DB files locally inside an isolated browser frame. Inspect tables, schema, and up to 100 preview rows without uploading the file or exposing its contents to the parent page, URL, or analytics.
SQLite viewerdatabase schematable previewJSON Schema validator
Use this json schema validator tool to inspect, convert, or generate a clear result directly in your browser.
LookupToolChakanTimestamp converter
Use this timestamp converter tool to inspect, convert, or generate a clear result directly in your browser.
LookupToolChakanURL encode and decode
Use this url encode and decode tool to inspect, convert, or generate a clear result directly in your browser.
LookupToolChakanQR code generator
Use this qr code generator tool to inspect, convert, or generate a clear result directly in your browser.
LookupToolChakanImage resizer
Resize an image locally to a target width and height and export PNG, JPEG, or WebP output.
LookupToolChakanHTTP status checker
Check one public URL for final HTTP status, redirect chain, key response headers, Baidu verification file readiness, release troubleshooting, and sitemap.xml.gz canonical redirect diagnostics.
LookupToolChakanMuscle group explorer
Find exercises by muscle area, or select an exercise to inspect the main and secondary muscle groups.
LookupToolChakanTroubleshooting guides
Causes, checks, and solutions for common problems.
Unified social credit code format and check-digit guide
A local-first guide to the 18-character unified social credit code structure, GB 32100-2015 check digit, authority/category segments, and safe validation boundaries.
TDEE, BMR, sleep-cycle, and daily water-intake planning
A local-first planning topic that connects TDEE, BMR, BMI, healthy-weight range, sleep-cycle timing, and daily water-intake estimates without medical claims.
Stock profit, dividend yield, savings-goal, compound interest, and inflation planning
A safe formula-based topic for stock profit, dividend yield, savings-goal backsolving, monthly compounding, retirement gaps, inflation-adjusted purchasing power, ROI, CAGR, and target-price planning.
China AI search answer-source and citation readiness checklist
A public-page readiness checklist for China AI search and answer systems: source visibility, title alignment, structured data, FAQ, internal links, keyword coverage, robots, sitemap, llms.txt, and log evidence without citation guarantees.
China search engine sitemap submission and crawl-readiness checklist
A practical checklist for China search readiness: verify robots, sitemap, ownership files, canonical rules, direct-answer content, log evidence, and the difference between automated and manual webmaster submissions.
Search Verification File Header and Cache Checklist
A release checklist for Baidu verification files, BingSiteAuth.xml, and IndexNow key files: status, content type, cache headers, validators, security headers, CSP, and China/global origin parity.
2026 World Cup time, countdown, watch, and travel planning tools
Use the official FIFA schedule as the source of truth, then convert kickoff times into your local time, count down to match day, write a clean viewing reminder, and share a safe link or QR code.
2026 World Cup viewing reminder copy and share-message templates
Write a World Cup viewing reminder that people can trust: verify the official fixture, convert it to local time, add a countdown, include the official fixture link, and share a QR code or tool link without copying a full schedule.
Mortgage, loan, tax, salary, and retirement planning calculators
A formula-first workflow for mortgage payments, provident-fund loans, early repayment, loan APR, simple interest, amortization, credit card payoff, salary/hourly conversion, China annual IIT reconciliation estimates, debt-to-income checks, uppercase RMB wording, fixed-asset depreciation, investment payback period, compound growth, ROI, CAGR, and retirement planning.
Browse by scenario
Tools are grouped around real lookup jobs instead of a long flat list.
Network and domain lookup
Inspect IP, DNS, WHOIS, HTTP headers, SSL certificates, and connectivity.
IP, domains and DNSSubnets, addresses and routingWeb protocols and certificatesSEO and GEO lookup
Inspect metadata, robots, sitemaps, structured data, and AI search visibility.
Page crawling and indexingAd monetization readinessLaunch rules and trackingText and developer tools
Format JSON, convert encodings, inspect timestamps, hashes, and developer text.
JSON and schemaMarkup, config and SQLURL and web codecsPrompts and keyword tools
Explore AI prompts, keyword ideas, long-tail terms, and dictionary-style tools.
AI prompts and keywordsDemand terms and search intentFinance and tax tools
Estimate loans, taxes, returns, market data, and precious metal decision checks.
Mortgages and loansTaxes, discounts and marginsInterest, savings and planningEveryday lookup tools
Common life, date, calendar, body, and public information utilities.
Date basicsDate ranges and calendarsTime, countdown and work hoursMath calculators
Inspect factorials, Fibonacci, prime factors, fractions, percentages, statistics, and common math formulas.
Number patterns and theoryFractions, ratios and statisticsAlgebra, equations and matricesChart builders
Generate local SVG previews for line, bar, pie, scatter, radar, funnel, and gauge charts.
Common chartsDiagrams and flowsImage tools
Inspect, resize, convert, compress, crop, rotate, and watermark images locally in the browser.
SVG and vector imagesImage dimensions and densityImage colors and site assetsFile tools
Inspect, package, preview, and organize common files locally in the browser without uploads.
ZIP archivesFile chunks and mergeLocal PDF tools