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Complete ToolPatch tools directory
ToolPatch is a growing collection of focused utilities and practical workflow toolkits. Each page handles one task with clear inputs, fast results, and usable outputs.
Toolkits for common workflows
Start with a workflow when the job spans several small tools, assumptions, or handoff steps.
Startup Unit Economics Toolkit
Build, stress-test, and communicate your core economics in one workflow.
Network Troubleshooting Toolkit
Diagnose addressing, DNS, and transport bottlenecks quickly.
Lab and Chemistry Calculations Toolkit
Plan solution preparation, dilution, gas-law, reaction-yield, and pH checks with visible chemistry assumptions.
Project Delivery Planning Toolkit
Forecast schedule and delivery risk using practical PM metrics.
Engineering Field Calcs Toolkit
Fast first-pass engineering calculations for site and workshop decisions.
Chart Generators Toolkit
Choose the right chart generator for radar, spider, radial, Gantt, Sankey, bubble, Pareto, funnel, waterfall, trend, comparison, and distribution views.
Marine Navigation Calculators Toolkit
Use practical marine navigation calculators for CPA/TCPA, under-keel clearance, tide windows, route distance, set and drift, fuel range, ETA, anchoring, COLREGs encounter checks, and vessel turning estimates.
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Developer & Network
Featured
JSON Diff Viewer
Compare two JSON objects and highlight differences.
Side-by-side JSON comparison with color-coded additions, deletions, and modifications.
Developer & Network
Featured
Subnet Calculator
Calculate network, broadcast, host range, and mask details from CIDR.
Analyze IPv4 subnets quickly for network planning, lab setup, and infrastructure troubleshooting.
Developer & Network
AI Prompt Optimizer
Analyze and improve AI prompts for clarity and effectiveness.
Evaluate your AI prompts across clarity, specificity, and structure dimensions. Get real-time scores, identify vague language, and receive suggestions for improvement. This tool helps craft prompts that yield better, more consistent results from language models without requiring external APIs. Enter any prompt and receive instant analysis with actionable improvement suggestions. Works for ChatGPT, Claude, Gemini, and any LLM. Use this before sending important prompts to catch clarity issues and optimize for response quality.
Developer & Network
API Response Formatter
Beautify and syntax highlight JSON/XML responses.
Format API responses with syntax highlighting, size stats, and copy functionality.
Developer & Network
Barcode Generator
Generate CODE39 and EAN-13 barcodes as SVG output.
Barcode Generator creates scan-ready SVG barcodes for CODE39 and EAN-13 directly in the browser workflow. It is useful for inventory labels, internal IDs, packaging mockups, and test fixtures where you need deterministic machine-readable output. The tool validates format-specific input, auto-calculates EAN-13 check digits for 12-digit payloads, and surfaces clear errors when content is invalid. You can control module width and bar height to tune readability for printers and scanners. Use this for practical operational output; confirm print quality and scanner compatibility before production rollouts.
Developer & Network
Base64 Encoder Decoder
Encode and decode Base64 text directly in browser.
Quick utility for API payload prep, debugging, and data transport checks.
Developer & Network
CIDR Aggregator
Compute a covering supernet for multiple CIDR blocks.
Summarize multiple routes into a single supernet to simplify route tables and policy logic.
Developer & Network
Cron Builder
Build cron expressions and ready-to-paste crontab lines from schedule fields.
Set minute/hour/day fields and generate cron expressions with command output for scheduling jobs.
Developer & Network
CSS Minifier/Beautifier
Minify or beautify CSS code.
Minify CSS for production or beautify for readability with size comparison and copy functionality.
Developer & Network
DNS Lookup
Query DNS records by type for a host.
Lookup A, AAAA, CNAME, MX, TXT, and NS records from one page for fast diagnostics.
Developer & Network
DNS Propagation Checker
Check DNS record propagation across major public resolvers.
DNS Propagation Checker queries multiple public resolvers and shows what each one currently returns for a given record type. It helps you verify whether DNS changes are fully visible worldwide or still inconsistent across recursive DNS providers. You can optionally provide an expected value (for example an A record IP or TXT token) to measure match rate directly. This is useful during domain cutovers, mail authentication setup, and outage triage where stale resolver data causes mixed behavior. Results reflect resolver caches and query timing at the moment you run the check.
Developer & Network
DNS Record Builder
Generate valid DNS zone record lines for common record types.
Build A, AAAA, CNAME, MX, TXT, and SRV records quickly with syntax guidance and defaults.
Developer & Network
EBCDIC Converter
Convert text to EBCDIC hex and vice-versa.
Translate strings between UTF-8 and EBCDIC (IBM037) encoding. Useful for mainframe data analysis and legacy system integration.
Developer & Network
Environment Variable Manager
Convert between .env formats and validate variables.
Convert environment variables between .env, Docker, Kubernetes, and JSON formats.
Developer & Network
Git Diff Stat Calculator
Calculate lines added/removed from git diff output.
Analyze git diffs with file-by-file breakdown of additions and deletions.
Developer & Network
Hash Generator
Generate MD5, SHA1, and SHA256 hashes from input text.
Instantly create common cryptographic hash outputs for strings and payload snippets. Useful for development workflows, debugging, and quick integrity checks.
Developer & Network
HTTP Headers Checker
Fetch response headers for a URL using HEAD requests.
Inspect status code and HTTP response headers to validate caching, security, and delivery setup.
Developer & Network
IP Classifier
Classify IPv4/IPv6 addresses by private, loopback, multicast, and more.
Instantly classify addresses for troubleshooting, security reviews, and docs validation.
Developer & Network
IP Lookup
Inspect IP type and reverse DNS details.
Look up IPv4/IPv6 properties including private/public class, loopback, multicast, and reverse DNS.
Developer & Network
IPv4 to Integer Converter
Convert IPv4 addresses to 32-bit integers and back.
Useful for database indexing, scripting, firewall rule systems, and low-level networking work.
Developer & Network
IPv6 Compressor Expander
Compress or fully expand IPv6 notation.
Normalize IPv6 addresses for documentation, automation pipelines, and compliance checks.
Developer & Network
JWT Decoder
Decode JWT header and payload claims for debugging.
Paste a JWT token to decode Base64URL header and payload, inspect registered claims, and check timestamp fields quickly.
Developer & Network
Latency Budget Calculator
Allocate and track end-to-end latency budget across system components.
Break down response-time targets into frontend, backend, DB, network, and external dependency budgets.
Developer & Network
Markdown Preview
Live markdown editor with real-time preview.
Write and preview markdown with GitHub Flavored Markdown support.
Developer & Network
MTU MSS Calculator
Calculate effective payload and TCP MSS from MTU and tunnel overhead.
Model encapsulation overhead across IPv4/IPv6 and common tunnels to prevent fragmentation issues.
Developer & Network
Packet Loss Impact Estimator
Estimate throughput degradation from loss and RTT assumptions.
Use a practical TCP-oriented rule-of-thumb model to quantify packet loss impact on effective throughput.
Developer & Network
Password Generator
Generate secure random passwords with customizable rules.
Create strong passwords with configurable length and character sets.
Developer & Network
Password Strength Checker
Evaluate password strength with score, entropy estimate, and improvement tips.
Check password quality using length, character classes, and common-pattern heuristics to quickly identify weak credentials.
Developer & Network
Port Range Planner
Plan port ranges against concurrent session requirements.
Estimate whether a configured port interval can handle projected concurrency safely.
Developer & Network
Random String Generator
Generate random strings with configurable length and character sets.
Create random tokens for IDs, test data, and temporary secrets with optional uppercase, digits, and symbols.
Developer & Network
Regex Tester
Test regular expressions with flags, matches, and capture groups.
Run regex patterns against text input and inspect match positions and captures quickly.
Developer & Network
SHA256 Generator
Generate SHA256 hashes from plain text input.
Create deterministic SHA256 digests for checksums, signatures, and debugging workflows.
Developer & Network
SQL Formatter
Beautify and format SQL queries.
Format SQL queries with proper indentation and keyword highlighting for better readability.
Developer & Network
SQL Prettifier
Format SQL queries into readable or compact output.
Paste SQL and convert between pretty-printed and compact forms for debugging, reviews, and docs.
Developer & Network
SSL Certificate Validator
Check SSL/TLS certificate validity and details.
Paste an SSL certificate or enter a domain to validate certificate chain, expiration date, key strength, and issuer details. Identifies warnings like upcoming expiration or weak cryptography. Supports PEM-formatted certificates and automatic domain lookups. Essential for DevOps teams managing certificate lifecycles and security compliance. Use this before deploying to catch certificate issues early and ensure uninterrupted HTTPS availability.
Developer & Network
Supernet Calculator
Find the smallest covering CIDR for an IPv4 start/end range.
Compute the minimal supernet that covers an address interval for route and ACL simplification.
Developer & Network
Throughput Unit Converter
Convert bps/Kbps/Mbps/Gbps and estimate transfer time.
Translate bandwidth units and estimate file transfer durations for operations and capacity planning.
Developer & Network
Unix Timestamp Converter
Convert unix timestamps to UTC datetime and back.
Translate epoch seconds and parseable datetime strings for logs, APIs, and debugging workflows.
Developer & Network
Uptime SLA Calculator
Translate SLA percentage targets into allowed downtime windows.
Compute maximum allowable downtime for day, week, month, or year across common uptime targets.
Developer & Network
URL Encoder Decoder
Encode and decode URL strings for safe query and path handling.
Convert text to URL-encoded form and decode encoded strings for debugging links, query params, and integrations.
Developer & Network
User Agent Parser
Parse browser, OS, and device from user-agent strings.
Analyze a user-agent string and detect browser family, operating system, and device class.
Developer & Network
VLSM Planner
Plan variable-length subnet allocations from a base CIDR.
Allocate host requirements into efficiently sized subnets and verify whether all requests fit in the parent block.
Developer & Network
What's My IP
Show the client IP address seen by the server.
Display the current request IP along with forwarded header hints for quick troubleshooting.
Developer & Network
WHOIS Lookup
Fetch WHOIS registration data for domains.
Retrieve raw WHOIS output for domain ownership and registrar metadata checks.
Developer & Network
Wildcard Mask Calculator
Convert subnet masks into wildcard masks for ACL rules.
Generate wildcard masks and binary mask views for router and firewall ACL configuration.
Developer & Network
XML Formatter
Pretty-print, compact, and validate XML quickly.
Format XML into readable indented output or compact form, and catch parse errors for faster debugging.