Networking
What Is My IP Address
See your public IP address, IP version, browser network details, and optional device location without third-party lookup services.
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Popular utilities
Networking
Subnet Calculator
Calculate IPv4 network, broadcast, mask, and host ranges.
Developer
Cron Builder
Build standard five-field cron expressions with readable explanations.
Testing & QA
Playwright Locator Builder
Build resilient Playwright role, label, text, test-id, CSS, and XPath locators.
Security
JWT Decoder
Decode JWT headers and claims locally without verifying signatures.
Finance
Currency Converter
Convert currencies using clearly labelled static reference rates.
Productivity
General Calculator
Evaluate safe arithmetic expressions with parentheses.
Networking
CIDR ↔ Subnet Mask
Convert contiguous IPv4 subnet masks and CIDR prefixes.
Developer
YAML Validator
Validate and format a safe, practical YAML subset locally.
Testing & QA
Playwright Assertion Builder
Generate readable Playwright web-first assertions from a locator and expectation.
Security
HMAC Generator
Generate HMAC-SHA256/384/512 values using Web Crypto locally.
Finance
EMI / Loan Calculator
Estimate reducing-balance monthly loan payments and interest.
Productivity
Age & Date Difference
Calculate date-only years, months, days, and total days.
Finance
Percentage Calculator
Calculate percentages, changes, and proportions.
Networking
IPv6 Subnet Calculator
Inspect IPv6 prefixes without enumerating their address space.
Developer
JSON → YAML
Convert valid JSON objects and arrays into readable YAML.
Testing & QA
Text & Code Diff Checker
Compare bounded text or source-code inputs with readable unified and side-by-side line diffs.
Security
Password Strength
Estimate password strength and patterns without storing the password.
Finance
SIP Calculator
Estimate recurring monthly investment growth illustratively.
Productivity
Business Days Calculator
Count weekdays with configurable weekends and exclusions.
Converters
Unit Converter
Convert length, mass, temperature, and digital storage.
Security
Password Generator
Generate secure random passwords with configurable character sets.
Converters
Timezone Converter
Convert date/time values between IANA timezones with DST support.
Developer
JSON Formatter
Validate, pretty-print, and minify JSON locally.
Security
Hash Generator
Generate SHA-256, SHA-384, or SHA-512 digests locally.
Productivity
Text Counter
Count characters, words, lines, and deterministic sentences locally.
Security
Base64 Encoder / Decoder
Encode and decode UTF-8 text without uploading it.
Networking
Port Reference
Search a curated reference of common TCP and UDP ports.
Developer
UUID Generator
Generate secure RFC 4122-compatible UUID v4 values.
Networking
DNS Record Builder
Build safe DNS zone-file record text without making changes.
Developer
Unix Timestamp Converter
Convert Unix seconds or milliseconds to local date and time.
Cloud & DevOps
Linux chmod Calculator
Build octal and symbolic chmod permissions safely.
Testing & QA
XPath Tester / Builder
Validate XPath expressions against detached sample markup in the browser.
Testing & QA
CSS Selector Builder
Compose and validate CSS selectors against detached sample markup.
Security
Key Pair Command Builder
Build safe copy-ready SSH and OpenSSL key-generation commands without executing them.
Testing & QA
Boundary Value Generator
Generate equivalence and edge values around numeric and length boundaries.
Testing & QA
Pairwise Test Case Generator
Generate a bounded deterministic 2-way pairwise covering array from parameter values.
Testing & QA
Test Data Generator
Generate bounded synthetic names, emails, identifiers, and records locally.
Testing & QA
API Assertion Builder
Build generic, Playwright, or Postman-style API assertions without sending requests.
Testing & QA
JSON Schema Validator
Validate common JSON Schema constraints locally without a remote service.
Testing & QA
JMeter Load Calculator
Estimate request volume, concurrency, and throughput for a load-test plan.
Testing & QA
Response Time Percentile Calculator
Calculate p50, p75, p90, p95, and p99 from bounded response-time samples.
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⌁NetworkingPractical IPv4, IPv6, DNS, ports, and bandwidth helpers.</>DeveloperFormat, convert, and inspect developer data.◇SecurityBrowser-local helpers for safer technical work.◈Cloud & DevOpsHelpers for infrastructure and operations.⇄ConvertersReliable everyday format and unit conversions.¤FinanceClear calculators for everyday planning.✓ProductivitySmall tools that keep work moving.✓Testing & QABrowser-local helpers for test automation, selectors, test design, test data, APIs, and performance planning.
Catalog
All utilities
Networking
What Is My IP Address
See your public IP address, IP version, browser network details, and optional device location without third-party lookup services.
Networking
Subnet Calculator
Calculate IPv4 network, broadcast, mask, and host ranges.
Developer
Cron Builder
Build standard five-field cron expressions with readable explanations.
Testing & QA
Playwright Locator Builder
Build resilient Playwright role, label, text, test-id, CSS, and XPath locators.
Security
JWT Decoder
Decode JWT headers and claims locally without verifying signatures.
Finance
Currency Converter
Convert currencies using clearly labelled static reference rates.
Productivity
General Calculator
Evaluate safe arithmetic expressions with parentheses.
Networking
CIDR ↔ Subnet Mask
Convert contiguous IPv4 subnet masks and CIDR prefixes.
Developer
YAML Validator
Validate and format a safe, practical YAML subset locally.
Testing & QA
Playwright Assertion Builder
Generate readable Playwright web-first assertions from a locator and expectation.
Security
HMAC Generator
Generate HMAC-SHA256/384/512 values using Web Crypto locally.
Finance
EMI / Loan Calculator
Estimate reducing-balance monthly loan payments and interest.
Productivity
Age & Date Difference
Calculate date-only years, months, days, and total days.
Finance
Percentage Calculator
Calculate percentages, changes, and proportions.
Networking
IPv6 Subnet Calculator
Inspect IPv6 prefixes without enumerating their address space.
Developer
JSON → YAML
Convert valid JSON objects and arrays into readable YAML.
Testing & QA
Text & Code Diff Checker
Compare bounded text or source-code inputs with readable unified and side-by-side line diffs.
Security
Password Strength
Estimate password strength and patterns without storing the password.
Finance
SIP Calculator
Estimate recurring monthly investment growth illustratively.
Productivity
Business Days Calculator
Count weekdays with configurable weekends and exclusions.
Converters
Unit Converter
Convert length, mass, temperature, and digital storage.
Networking
VLSM Calculator
Allocate non-overlapping variable-length IPv4 subnets.
Developer
Regex Tester
Test JavaScript regular expressions with bounded local input.
Testing & QA
Playwright Test Skeleton Generator
Create a copy-ready, local Playwright test skeleton without executing a browser.
Security
Password Generator
Generate secure random passwords with configurable character sets.
Finance
GST Calculator
Add or remove Indian GST from an amount.
Productivity
Working Days Calculator
Count working days between two dates without global holiday assumptions.
Converters
Timezone Converter
Convert date/time values between IANA timezones with DST support.
Developer
JSON Formatter
Validate, pretty-print, and minify JSON locally.
Networking
IP Range → CIDR
Summarize an inclusive IPv4 range into exact CIDR blocks.
Developer
URL Encoder / Decoder
Encode and decode URL components without uploading input.
Testing & QA
Playwright Wait / Timeout Helper
Build explicit Playwright wait snippets and timeout guidance.
Security
Hash Generator
Generate SHA-256, SHA-384, or SHA-512 digests locally.
Finance
Compound Interest Calculator
Calculate future value across common compounding frequencies.
Productivity
Text Counter
Count characters, words, lines, and deterministic sentences locally.
Converters
SLA Downtime Calculator
Calculate allowed downtime from availability targets and periods.
Security
Base64 Encoder / Decoder
Encode and decode UTF-8 text without uploading it.
Networking
Port Reference
Search a curated reference of common TCP and UDP ports.
Developer
Query String Parser
Inspect repeated query-string keys as a table and JSON.
Testing & QA
Playwright Network Mock Builder
Build local route.fulfill mock snippets with bounded response data.
Security
Random Token Generator
Generate bounded cryptographically secure tokens in common encodings.
Finance
Simple Interest Calculator
Calculate simple interest and total amount.
Productivity
Duplicate Line Remover
Remove repeated lines with case and ordering controls.
Converters
Number Base Converter
Convert binary, octal, decimal, and hexadecimal values with BigInt.
Developer
UUID Generator
Generate secure RFC 4122-compatible UUID v4 values.
Networking
DNS Record Builder
Build safe DNS zone-file record text without making changes.
Developer
XML Formatter / Validator
Validate, pretty-print, and minify XML with browser-safe parsing.
Testing & QA
Playwright Route Intercept Builder
Generate route interception snippets for continue, abort, inspect, or mock behavior.
Security
Password Entropy Calculator
Estimate theoretical entropy from length and character pool.
Finance
Loan Amortization Calculator
Generate a bounded month-by-month principal and interest schedule.
Productivity
Whitespace Cleaner
Trim lines, normalize endings, and clean repeated spaces explicitly.
Converters
Color Converter
Convert HEX, RGB, and HSL values with textual output and preview.
Developer
Unix Timestamp Converter
Convert Unix seconds or milliseconds to local date and time.
Networking
Transfer Time Calculator
Estimate transfer duration from data size and bandwidth.
Developer
CSV ↔ JSON
Convert bounded CSV data and flat JSON records locally.
Testing & QA
Playwright Config Helper
Build a bounded Playwright configuration starter for local test projects.
Security
PEM / Certificate Decoder
Inspect safe certificate metadata from local PEM input.
Finance
Savings Goal Calculator
Project savings progress and estimate a required monthly contribution.
Productivity
Random Picker
Choose one or more items from a bounded local list.
Converters
Roman Numeral Converter
Convert canonical Roman numerals and integers from 1 to 3999.
Cloud & DevOps
Linux chmod Calculator
Build octal and symbolic chmod permissions safely.
Networking
IP Address Converter
Convert IPv4 addresses between decimal, integer, binary, and hex.
Developer
JSON ↔ XML
Convert common JSON objects and XML without external services.
Testing & QA
XPath Tester / Builder
Validate XPath expressions against detached sample markup in the browser.
Security
CSR Decoder
Inspect locally supplied PKCS#10 CSR metadata where available.
Productivity
Lorem Ipsum Generator
Generate bounded placeholder words, sentences, or paragraphs locally.
Networking
IPv4 Binary Converter
Learn and convert between dotted IPv4 and grouped binary.
Developer
YAML ↔ JSON
Convert safe YAML configuration data to and from JSON.
Testing & QA
CSS Selector Builder
Compose and validate CSS selectors against detached sample markup.
Security
Public Key Fingerprint
Fingerprint public-key material locally using SHA-256.
Productivity
QR Code Generator
Generate a local QR payload preview without tracking or uploads.
Networking
CIDR Aggregator / Summarizer
Normalize and merge adjacent IPv4 CIDR blocks safely.
Developer
Markdown Preview
Preview common Markdown with sanitized local HTML output.
Testing & QA
Test Case Template Generator
Generate traceable manual or automated test-case templates.
Security
Key Pair Command Builder
Build safe copy-ready SSH and OpenSSL key-generation commands without executing them.
Networking
Subnet Splitter
Split an IPv4 parent network into bounded equal subnets.
Testing & QA
Boundary Value Generator
Generate equivalence and edge values around numeric and length boundaries.
Security
CSR Generator
Validate certificate subject fields and build a local OpenSSL CSR command.
Networking
IPv6 Compressor / Expander
Validate and convert IPv6 addresses to canonical forms.
Testing & QA
Pairwise Test Case Generator
Generate a bounded deterministic 2-way pairwise covering array from parameter values.
Developer
Text Case Converter
Convert text into common developer and editorial cases.
Networking
MAC Address Formatter
Normalize valid 48-bit MAC addresses into common formats.
Testing & QA
Gherkin / BDD Scenario Builder
Build readable Feature, Scenario, and Given/When/Then specifications.
Developer
Line Sort / Deduplicate
Sort, trim, and deduplicate bounded line-oriented text.
Networking
MTU / MSS Calculator
Estimate TCP MSS for common IPv4 and IPv6 MTUs.
Testing & QA
Test Data Generator
Generate bounded synthetic names, emails, identifiers, and records locally.
Developer
Slug Generator
Create URL-friendly slugs with predictable separators.
Networking
Bandwidth Converter
Convert bits and bytes per second with explicit units.
Testing & QA
Date Edge-Case Generator
List month-end, leap-year, DST, timezone, and offset date cases.
Developer
Hex ↔ Text
Convert UTF-8 text to hexadecimal bytes and back.
Networking
URL / Host Parser
Inspect URL parts while masking any supplied password.
Testing & QA
API Assertion Builder
Build generic, Playwright, or Postman-style API assertions without sending requests.
Developer
Base32 Encoder / Decoder
Encode and decode UTF-8 text using RFC 4648 Base32.
Testing & QA
JSON Schema Validator
Validate common JSON Schema constraints locally without a remote service.
Developer
Semantic Version Comparator
Compare SemVer major, minor, patch, and prerelease values.
Testing & QA
HTTP Test Payload Builder
Build a masked request preview and curl payload without executing it.
Testing & QA
JMeter Load Calculator
Estimate request volume, concurrency, and throughput for a load-test plan.
Testing & QA
Response Time Percentile Calculator
Calculate p50, p75, p90, p95, and p99 from bounded response-time samples.
Testing & QA
Guidewire Test Scenario Builder
Create generic insurance-domain test scenarios without proprietary content or system connections.
No utilities found. Try another keyword or browse categories.