Browser-local utilities
Privacy-first developer tools for time, data, APIs, DevOps, and trading calculators.
Fast static tools with React islands only where interaction is needed. Your input stays in the browser.
Tool categories
Time Tools
Timestamp, UTC, timezone, and trading session converters for developers and operators.
Data Tools
Format, validate, encode, decode, and transform structured data locally in your browser.
API Tools
Small browser-side utilities for API debugging, request conversion, and token inspection.
DevOps Tools
Cron, regex, UUID, hashing, and operational helpers for everyday engineering work.
Trading Developer Tools
Crypto, API, and trading bot development calculators and formatters for educational use.
SEO guides and tool hubs
Timestamp Conversion Tools
Convert Unix seconds, milliseconds, ISO 8601, UTC, and local time without uploading values.
JSON Debugging Tools
Format, validate, and transform JSON payloads locally for API debugging and documentation.
Cron Expression Tools
Read and inspect cron expressions used by scheduled jobs, runbooks, and automation.
JWT Debugging Tools
Decode JWT payloads and inspect related Base64 and JSON data safely in the browser.
Trading Calculator Tools
Educational calculators for position sizing, futures PnL, and trading session time zones. Not financial advice.
Trading Developer Tools
Crypto, exchange API, and trading bot development tools for candle timing, precision formatting, alert parsing, and educational risk math.
All tools
Unix Timestamp
Convert Unix seconds or milliseconds to ISO, UTC, local time, and back.
timeMilliseconds Timestamp
Convert JavaScript millisecond timestamps to ISO and Unix seconds.
timeISO 8601
Convert ISO 8601 dates into UTC strings and Unix timestamps.
timeUTC Time
Convert a date or current time to UTC and local time.
timeTimezone
Convert a date to a selected IANA timezone.
timeTrading Sessions
Compare one timestamp across major trading centers.
dataJSON Formatter
Format minified JSON into readable two-space indentation.
dataJSON Validator
Validate JSON syntax locally and get parse errors.
dataJSON to TypeScript
Generate a simple TypeScript interface from a JSON object.
apiJWT Decoder
Decode JWT header and payload locally without verifying the signature.
dataBase64
Encode and decode Base64 strings locally.
apiURL Encode
Encode and decode URL components.
apiQuery Parser
Parse a URL query string into JSON.
apicURL to Fetch
Convert simple cURL commands into JavaScript fetch snippets.
devopsCron Parser
Explain standard 5-field cron expressions.
devopsRegex Tester
Test a JavaScript regular expression against sample text.
devopsUUID
Generate random UUID v4 values in your browser.
devopsSHA256
Generate a SHA-256 hash for text locally.
tradingPosition Size
Estimate trading position size from account, risk, entry, and stop values.
tradingFutures PnL
Estimate futures profit and loss from entry, exit, contracts, multiplier, and side.
tradingCandle Close Time
Calculate the close time for a crypto kline or candlestick from open time and interval.
tradingKline Interval
Convert crypto kline intervals such as 1m, 15m, 1h, 1d, and 1w into milliseconds and seconds.
tradingFunding Fee
Estimate perpetual futures funding fees from notional size and funding rate.
tradingLiquidation Price
Estimate a simplified liquidation price from entry, leverage, side, and maintenance margin.
tradingRisk Reward
Calculate risk per unit, reward per unit, and risk/reward ratio from entry, stop, target, and side.
tradingKelly Criterion
Calculate a simple Kelly fraction from assumed win rate and reward/risk ratio.
tradingATR Position Size
Estimate position size using account risk, ATR, ATR multiplier, and unit value.
tradingTick Size
Round a price to an exchange tick size using down, up, or nearest mode.
tradingStep Size
Round an order quantity to an exchange step size using down, up, or nearest mode.
tradingTradingView Alert
Parse TradingView webhook alert JSON or key=value content into formatted JSON.