- Base64 Encode / Decode Tool
Encode text to Base64, decode Base64 to text, and convert files to Base64 or data URI locally in your browser.
- JSON Formatter & Validator
Pretty-print, minify, and validate JSON in your browser. Highlight errors and copy formatted results without sending data to a server.
- Query String Parser
Parse raw query strings or full URLs, inspect repeated keys, decode values, and copy a normalized query locally in your browser.
- Hash Generator Tool
Generate SHA-1, SHA-256, and SHA-512 hashes for text or files in your browser.
- URL Encoder / Decoder Tool
Percent-encode text, decode strings, and parse full URLs with an editable query parameter list in your browser.
- Float Inspector Tool
Inspect IEEE 754 bit layouts for float16, bfloat16, float32, and float64.
- Regex Tester Tool
Test JavaScript regular expressions online with pattern, flags, match preview, capture groups, and replace output.
- JSON Diff Tool
Compare two JSON documents online by structure. See added keys, removed keys, changed values, and parse errors locally in your browser.
- Text Diff Tool
Compare two plain text blocks online line by line. Review added lines, removed lines, unchanged lines, and optional trailing-whitespace handling locally in your browser.
- UUID Generator (v4/v7) – bulk, format, validate
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
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
Generate business-style IDs from a pattern (date, sequence, random).
- Random JSON Generator (Test Data) — array & NDJSON
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
Generate SQL INSERT statements from a schema for Postgres, MySQL, or SQLite.
- Random Log Generator — Nginx, Apache & JSON logs
Generate fake access logs (Nginx/Apache) or JSONL logs with controllable distributions.
- Synthetic Time Series Generator — trend, seasonality
Generate synthetic time series data with trend, seasonality, noise, missing values, and outliers.
- Random CSV generator – test data & schema JSON
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.
- CSV Column Profiler
Paste CSV or TSV data to inspect column types, missing values, unique counts, and next chart or stats options.
- Token generator – secure random strings (base64url, hex)
Generate secure random tokens and random strings locally in your browser.
- Embed Builder — share links & iframe code
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
Convert text between upper, lower, title, sentence, snake_case, camelCase, and kebab-case instantly in your browser.
- Fullwidth/Halfwidth Katakana Converter (Zenkaku/Hankaku)
Convert Japanese text between fullwidth/halfwidth and Hiragana/Katakana in your browser.