Developer tools
Formatters, encoders, JWT, cron, hashes, and more for everyday engineering tasks.
- Unix timestamp converterUnix epoch seconds / milliseconds, readable dates, timezone-aware conversion - fast and 100% local.
- YAML / JSON converterYAML <-> JSON conversion, pretty-print, copy-ready output - 100% in-browser.
- JSON formatterJSON validation, pretty-print, minify, configurable indent, copy-friendly output - 100% local.
- JSON diffJSON comparison, line-level highlights, parse-error feedback, pretty-printed diff - in-browser.
- JWT decoderJWT header and claims decode, UTC exp / nbf / iat, optional HS256 / HS384 / HS512 verify - no upload.
- Base64 encoderUTF-8 text and binary files up to 60 MB, Base64 encode / decode, local processing, no upload.
- Hash generatorSHA-256, SHA-384, SHA-512, SHA-1 hashes, Web Crypto support, lowercase hex output - 100% local.
- Color converterHEX, RGB, HSL, alpha support, native color picker, live preview, one-click CSS copy.
- Regex testerJavaScript regex testing, match indices, capture groups, inline highlights, standard flags - local engine.
- URL encoder & decoderURL encode / decode, query string parser, URL parts breakdown, UTF-8 safe - 100% local.
- Word counterWord, line, paragraph, character, grapheme cluster, UTF-8 byte counts - live and local.
- Cron expression parserCron expression preview, next 5 run times, plain-English explanation, local parsing.
- Markdown table generatorSpreadsheet rows to GitHub-flavored Markdown tables, live preview, copy-ready output - in-browser.
- Case convertercamelCase, PascalCase, snake_case, kebab-case, CONSTANT_CASE conversion - instant and fully local.
- .env parser.env validation, key listing, duplicate detection, normalized export copy - in-browser.
- Markdown to HTMLMarkdown to HTML, headings, emphasis, code blocks, links, local rendering.
- HTML minifierHTML minify and beautify, production snippets, review-friendly formatting - stays on-device.
- Text diffText comparison, line-by-line added / removed highlights, private local diff.
- Age calculatorAge in years, months, days, total days, birth date to target date - 100% local.
- BMI calculatorBMI calculator, metric and imperial units, category band, instant local result.
- Unit converterLength and temperature conversions, metric and imperial units, instant local results.
- TOML converterTOML <-> JSON conversion, direction toggle, pretty-print output - 100% in-browser.
- JSON to CSV converterJSON arrays to Excel-ready CSV, nested field flattening, UTF-8 BOM, private browser processing.
- Log sanitizerIP, email, phone, API key and token redaction, preview counts, clean logs for safe sharing.
- AES text encryptorAES-GCM text encryption, PBKDF2 password keys, decrypt locally, copy encrypted JSON safely.
- Key format converterRSA PEM to JWK, JWK to PEM, auto-detect key format, Web Crypto local conversion.