Developer Tools Calculators
16 calculatorsPractical tools for developers and IT professionals: formatting, encoding, parsing, regex, API debugging, and AI/LLM cost estimation.
16 calculators available
Developer Utilities(8)↑ top
Bandwidth Calculator
Calculate required network bandwidth based on number of user…
Cron Expression Parser
Parse cron expressions and calculate next run times. Support…
IP Subnet Calculator
Calculate subnet ranges, broadcast addresses, and CIDR notat…
JWT Decoder
Decode JWT tokens to inspect header and payload. View the al…
Password Generator
Generate cryptographically strong random passwords with conf…
Regex Tester
Test regular expressions against text. Match and replace pat…
Timestamp Converter
Convert between Unix timestamps and human-readable dates. Su…
UUID Generator
Generate UUIDs (v4 and v7) instantly in your browser. Suppor…
Formatting & Encoding(5)↑ top
Base64 Encode / Decode
Convert text or binary data to Base64 encoding and decode Ba…
Case Converter
Convert text between camelCase, PascalCase, snake_case, keba…
Color Converter
Convert colors between Hex, RGB, HSL, and HSV color formats …
JSON Formatter & Validator
Format, validate, and minify JSON data instantly. Supports p…
URL Encode / Decode
Encode or decode text using URL percent-encoding (RFC 3986).…
AI & LLM Tools(3)↑ top
Context Window Calculator
Compare context window sizes across GPT-5.6, Claude Opus 5, …
LLM API Cost Calculator
Calculate API costs for GPT-5.6, Claude Opus 5, Gemini 3.6, …
Token Counter Calculator
Estimate token counts and API costs across GPT-5.6, Claude O…
Frequently Asked Questions
- ❓ How do I format JSON for readability?
- ✅ Paste raw JSON into our JSON formatter and it will indent, sort, and validate the structure. It also flags syntax errors so you can catch malformed responses before shipping them.
- ❓ What is a UUID and how is it generated?
- ✅ A UUID (Universally Unique Identifier) is a 128-bit identifier used to tag records, sessions, and objects. Our UUID generator produces version 4 random UUIDs with a full 122 bits of randomness, so collisions are practically impossible.
- ❓ How do I estimate LLM API costs?
- ✅ Enter the token count, pricing per 1K input/output tokens, and expected traffic. The calculator accounts for the input/output price split and caching multipliers to project your monthly spend.