Free Online Tools — fast and private.

Generate and decode UUID v4, UUID v7, and ULIDs instantly in your browser.

Build cron expressions, parse them into human-readable text, and calculate next execution dates.

Calculate chmod octal/symbolic permissions instantly with an interactive matrix.

Convert cURL commands to Fetch, Axios, Python Requests, Go, and more.

Format, validate, and encode/decode JSON with Monaco editor — lenient parsing, local save, all client-side.

Generate Kotlin data classes from a JSON object, complete with @SerialName annotations.

Generate Swift Codable structs with CodingKeys from a JSON sample.

Generate Rust structs with serde attributes from a JSON sample.

Parse SQL INSERT statements and convert them into structured JSON arrays.

Compare two JSON objects side-by-side to highlight missing or changed parameters.

Convert a JSON object to a Dart class with fromJson, toJson, and null-safe fields.

Convert a JSON object to TypeScript interfaces — nested types, optional fields, all client-side.

Convert a JSON object to Python dataclasses with from_dict, to_dict, and Optional typing.

Convert JSON to YAML or YAML to JSON instantly — bidirectional, lenient parser, swap button.

Convert JSON to XML or XML to JSON instantly — bidirectional, configurable root tag.

Convert JSON to TOML or TOML to JSON — bidirectional, client-side, instant.

Convert JSON to TOON format — compact, LLM-optimised notation that cuts token costs by 30–60%.

Convert TOON format back to JSON — bidirectional, client-side, instant.

Generate a Zod schema from a JSON sample — nested objects, arrays, and optional fields.

Generate Python Pydantic BaseModel classes from a JSON sample — nested objects, arrays, and aliases.

Convert a Zod schema to TypeScript interfaces — supports z.object, z.union, z.enum, z.array and more.

Generate a JSON Schema (Draft-07) from a JSON sample — properties, types, and required fields.

Convert .env files to JSON or JSON back to .env format — bidirectional, comments stripped.

Generate Go structs with json tags from a JSON object — nested types and arrays included.

Convert CSV to a JSON array — auto-detect delimiter, optional headers, dynamic typing.

Flatten a JSON array of objects into CSV — choose your delimiter, headers auto-generated.

Calculate subnet mask, network address, broadcast address, and usable IP range.

See your public IPv4 and IPv6 address along with location metadata.

Test regular expressions with real-time highlighting and capture group extraction.

Estimate prompt tokens for GPT-4o, Claude 3.5, and Gemini API.

Remove all spaces, extra spaces, tabs, or line breaks from any text — seven modes, instant results.

Count words, characters, sentences, and paragraphs in real time.

Write or paste Markdown and see a live rendered preview — supports GFM tables, code blocks, and more.

Convert text between UPPER, lower, Title, camelCase, snake_case, and more.

Generate placeholder Latin text — words, sentences, or paragraphs.

Encode or decode Base64 strings instantly — client-side, no data sent to any server.

Percent-encode or decode full URLs and individual query-string components — live, client-side.

Convert special characters to HTML entities and back.

Convert text to hexadecimal and back — great for debugging binary data.

Decode any JWT instantly — header, payload, standard claims, expiry status, and algorithm. No secret needed.

Generate MD5, SHA-1, SHA-256, or SHA-512 hashes from any text.

Convert colors between HEX, RGB, HSL, and HSV instantly.

Generate harmonious color palettes from a seed color.