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.

Paste RGBA color codes to generate live color swatches, inspect opacity, and convert to HEX, HEX8, RGB, and HSLA.

Generate harmonious color palettes from a seed color.