Tool directory
44 focused utilities for developers, IT admins and technical founders. Each one works instantly in the browser — no account required.
Developer & API
JWT Decoder & Verifier
Decode header and payload, inspect claims, check expiry.
/tools/jwt-decoder
Base64 Encoder & Decoder
Encode and decode Base64 with full Unicode support.
/tools/base64-encoder
Regex Tester & Builder
Live match highlighting, capture groups and flags.
/tools/regex-tester
Cron Expression Generator
Build cron syntax and preview the next run times.
/tools/cron-expression-generator
SQL Query Formatter
Turn one-line spaghetti SQL into readable, reviewable queries.
/tools/sql-formatter
URL Encoder & Decoder
Percent-encode or decode URLs and query parameters safely.
/tools/url-encoder
HTML Entity Encoder & Decoder
Escape and unescape HTML entities instantly.
/tools/html-entity-encoder
JSON Path Extractor
Query nested JSON with dot paths and wildcards.
/tools/json-path-extractor
JSON Schema Generator
Turn a sample payload into a validation schema.
/tools/json-schema-generator
UUID Generator
Bulk random v4 and sortable v7 identifiers.
/tools/uuid-generator
Unix Timestamp Converter
Epoch seconds and milliseconds to dates, both directions.
/tools/timestamp-converter
YAML to JSON Converter
YAML and JSON conversion with strict validation.
/tools/yaml-json-converter
cURL to Code Converter
Turn any cURL command into Python, JavaScript or Go.
/tools/curl-converter
Security & Infrastructure
Security Headers Checker
Grade a site's HTTP security headers in seconds.
/tools/security-headers-checker
Password Policy Generator
Generate an IT password policy your auditors will accept.
/tools/password-policy-generator
Hash Generator
SHA-1, SHA-256 and SHA-512 digests in your browser.
/tools/hash-generator
HMAC Generator
Sign payloads with HMAC to test webhook verification.
/tools/hmac-generator
Chmod Permission Calculator
Octal and symbolic Unix permissions, both directions.
/tools/chmod-calculator
IP Subnet Calculator
CIDR to network, broadcast, host range and mask.
/tools/subnet-calculator
Data Size Converter
Decimal and binary data size conversion side by side.
/tools/byte-converter
Secure API Key Generator
CSPRNG-backed keys, tokens and secrets with prefixes.
/tools/api-key-generator
Password Strength Checker
Entropy in bits and a realistic offline crack estimate.
/tools/password-strength-checker
DNS Lookup Tool
Live DNS record lookup with TTLs, over DoH.
/tools/dns-lookup
Uptime SLA Calculator
Turn nines into real downtime budgets.
/tools/sla-uptime-calculator
AI & Prompts
AI Cost Calculator
Project monthly LLM spend across models before you ship.
/tools/ai-cost-calculator
Prompt Generator & Optimizer
Turn a rough idea into a structured system prompt.
/tools/prompt-optimizer
LLM Token Counter
Estimate prompt tokens and what they cost per call.
/tools/token-counter
Prompt Template Builder
Assemble structured, reusable prompts section by section.
/tools/prompt-template-builder
Business & Ops
ROI Calculator
ROI, net profit, ROAS and payback period in one view.
/tools/roi-calculator
SaaS Churn & LTV Calculator
LTV, average lifetime and LTV:CAC from MRR and churn.
/tools/churn-ltv-calculator
Freelance Hourly Rate Calculator
The rate you actually need, after tax, expenses and time off.
/tools/freelance-rate-calculator
Word & Character Counter
Words, characters, reading time and SEO length checks.
/tools/word-counter
Profit Margin Calculator
Margin, markup and target-price maths in one place.
/tools/profit-margin-calculator
Break-Even Calculator
Units and revenue needed before you make a profit.
/tools/break-even-calculator
NPS Calculator
Score, breakdown and benchmark from raw survey counts.
/tools/nps-calculator
Utility & Formatting
JSON Formatter & Validator
Beautify, minify and validate JSON with precise error positions.
/tools/json-formatter
JSON to CSV Converter
Convert JSON arrays to CSV and CSV back to JSON.
/tools/json-csv-converter
Text Diff Checker
Line-by-line comparison of two text blocks.
/tools/diff-checker
QR Code Generator
Clean, trackable-free QR codes as downloadable PNGs.
/tools/qr-code-generator
URL Slug Generator
Clean, readable, SEO-friendly URL slugs from any title.
/tools/slug-generator
Case Converter
Switch identifiers between every common naming convention.
/tools/case-converter
Lorem Ipsum Generator
Placeholder copy for mockups, in plain text or HTML.
/tools/lorem-ipsum-generator
Color Converter
HEX, RGB, HSL and OKLCH conversions with live preview.
/tools/color-converter
Markdown to HTML Converter
Markdown in, clean semantic HTML out, with live preview.
/tools/markdown-to-html