- JSON Formatter & Validator | Pretty-print and check errors | CalcBE
Pretty-print, minify, and validate JSON in your browser. Highlight errors and copy formatted results without sending data to a server.
- UUID Generator (v4/v7) – bulk, format, validate, and parse | CalcBE
Generate UUID v4 or UUID v7 in bulk, format them (canonical/URN/braces), copy or download, and validate UUIDs with v7 timestamp decoding—runs locally in your browser.
- IPv4 subnet & CIDR calculator – network address, host range and usable IPs | CalcBE
Convert any IPv4 address and prefix length into its network address, broadcast address, usable host range, and total capacity.
- Pattern String Generator — business IDs & sequences | CalcBE
Generate business-style IDs from a pattern (date, sequence, random). Runs locally in your browser — no uploads; share settings-only URLs.
- Random JSON Generator (Test Data) — array & NDJSON | CalcBE
Generate JSON test data from a schema. Export as JSON array or NDJSON. Runs locally in your browser — no uploads; share settings-only URLs.
- Random SQL INSERT Generator — Postgres, MySQL, SQLite | CalcBE
Generate SQL INSERT statements from a schema for Postgres, MySQL, or SQLite. Runs locally in your browser — no uploads; share settings-only URLs.
- Random Log Generator — Nginx, Apache & JSON logs | CalcBE
Generate fake access logs (Nginx/Apache) or JSONL logs with controllable distributions. Runs locally — no uploads; share settings-only URLs.
- Synthetic Time Series Generator — trend, seasonality & noise | CalcBE
Generate synthetic time series data with trend, seasonality, noise, missing values, and outliers. Runs locally — no uploads; share settings-only URLs.
- Random CSV generator – test data & schema JSON | CalcBE
Generate random CSV test data in your browser. Define columns, preview rows, then download CSV and schema JSON — no uploads and share settings-only URLs.
- Token generator – secure random strings (base64url, hex) | CalcBE
Generate secure random tokens and random strings locally in your browser. Choose base64url, hex, or a custom charset. Copy, download, and share settings (no tokens in URLs).
- Embed Builder — share links & iframe code | CalcBE
Create CalcBE share links and responsive iframe embeds. Supports presets, UTM tags, base64url cfg, optional hash mode, and an auto-height snippet.
- Text Case Converter — upper/lower/title, snake/camel/kebab | CalcBE
Convert text between upper, lower, title, sentence, snake_case, camelCase, and kebab-case instantly in your browser.
- Zenkaku/Hankaku Converter – kana, fullwidth/halfwidth | CalcBE
Convert Japanese text between fullwidth/halfwidth and Hiragana/Katakana in your browser. Your text never leaves your device.