Online Tools
Free Online Tools
Converters, calculators, and developer utilities — open any tool below to get started.
All tools
42 free utilities — 4 per row on desktop.
Afghan Date ConverterConvert between Afghan Solar Hijri and Gregorian dates.Nepal Date ConverterConvert Nepali Bikram Sambat dates to Gregorian.Hebrew Date ConverterConvert Hebrew calendar dates to Gregorian.Hijri Date ConverterConvert Islamic Hijri dates to Gregorian.Swim Time ConverterConvert swimming times across distances and formats.Grams to Cups ConverterConvert grams into cups for baking ingredients.CIDR CalculatorCalculate IPv4 CIDR blocks, netmask, and host ranges.Subnet Mask CalculatorConvert CIDR to subnet mask and calculate usable hosts.IPv4 Subnet CalculatorSubnet IPv4 networks and list usable host ranges.Wildcard Mask CalculatorConvert subnet/CIDR to Cisco ACL wildcard masks.IP Range CalculatorFind first/last IP and address counts from CIDR.VLSM CalculatorVariable-length subnet planning for CCNA labs.Network Address CalculatorFind the network address from IP and mask/CIDR.Broadcast Address CalculatorCalculate the broadcast address for an IPv4 subnet.Bandwidth CalculatorEstimate bandwidth needs for users and apps.Data Transfer Time CalculatorEstimate download/upload time from size and speed.DNS LookupCheck A, AAAA, MX, NS, TXT, and more DNS records.MX Record LookupInspect mail exchanger priorities for any domain.Reverse DNS LookupFind PTR hostnames from public IP addresses.Port CheckerTest whether a public TCP port is open.HTTP Status Code CheckerCheck live HTTP status codes and redirects.SSL Certificate CheckerInspect HTTPS certificate details and SANs.SSL Expiry CheckerSee how many days remain before SSL expiry.HTTP Security Headers CheckerScan CSP, HSTS, and other hardening headers.Password Strength CheckerEstimate password strength privately in your browser.Hash GeneratorGenerate MD5, SHA-1, SHA-256, and SHA-512 hashes.Rotary Phase ConverterSize and estimate rotary phase converter setups.JWT DecodeDecode and inspect JSON Web Tokens instantly.Regex Cheat SheetQuick regex syntax reference with live tester.Regex TesterMatch, replace, and split with live regex testing.Cron Expression GeneratorBuild Unix, Quartz, AWS, and Azure cron schedules.JSON to YAMLConvert JSON ↔ YAML online with a clean dual-pane UI.JSON to CSVConvert JSON ↔ CSV for Excel and data workflows.JSON to XMLConvert JSON ↔ XML with pretty output and download.JSON to TOMLConvert JSON ↔ TOML for config files.Convert Timestamp to DateConvert Unix timestamps to human-readable dates.Expiration Date Code ConverterDecode product expiration date codes.Afghan Tax CalculatorEstimate Afghan tax amounts quickly.Currency ExchangeCheck currency exchange rates and convert amounts.Zakat CalculatorCalculate Zakat on wealth and assets.Online Tasbih CounterDigital tasbih / dhikr counter for daily use.Provinces, Districts & Villages DataBrowse Afghanistan provinces, districts, and villages.