免費線上工具
268+ free online tools for PDF, images, SEO, developers, color, and productivity. Fast, browser-based, and private — no signup, no installs, no limits. Search above or browse by category below.
Total tools26810.8K total uses
Categories13Active categories
Most usedJSON Formatter4.1K uses
Recently addedExperiment RandomizerNewest tool
CIDR Calculator
Analyze CIDR blocks, convert prefix lengths to subnet masks, split networks, and check whether an IP belongs to a range.
Used 0 times•Updated never
MX Record Lookup
Look up mail exchange (MX) DNS records for a domain, sorted by priority with mail host IP resolution.
Used 0 times•Updated never
SPF Record Checker
Look up and validate SPF TXT records for a domain. Parse mechanisms, count DNS lookups, and review policy strength.
Used 0 times•Updated never
Port Scanner
Scan common TCP ports on a public host — check which services are reachable from the server.
Used 0 times•Updated never
Traceroute Tool
Trace the network path to a hostname or IP. Shows each hop, round-trip times, and whether the route completed.
Used 0 times•Updated never
Website Uptime Checker
Check if a website is online from the server. See HTTP status, response time, redirects, and key response headers.
Used 0 times•Updated never
HTTP Header Checker
Inspect HTTP response headers for any URL. Review security headers, caching directives, CORS, and server metadata.
Used 0 times•Updated never
User Agent Parser
Parse user agent strings to identify browser, engine, operating system, device type, and bot detection.
Used 0 times•Updated never
Diff Checker
Compare two texts and highlight added, removed, and changed lines or words instantly in your browser.
Used 0 times•Updated never
JWT Decoder
Decode JSON Web Tokens to inspect the header, payload, and claims instantly in your browser — no data leaves your device.
Used 0 times•Updated never
JSON Beautifier
Beautify and explore JSON with adjustable indentation, key sorting, a collapsible tree view, and structure stats.
Used 0 times•Updated never