Find the right tool
Thirty-five focused tools for code, data and everyday tasks. Choose a category or search by name. Every tool runs in your browser. See also the AI & LLM developer tools.
35 tools
JSON Formatter & Validator
Format and validate JSON with readable indentation.
Open tool Developer ToolsJSON Minifier
Remove unnecessary whitespace from valid JSON.
Open tool Encoding & ConversionBase64 Encoder & Decoder
Encode and decode UTF-8 text without losing Unicode.
Open tool Encoding & ConversionURL Encoder & Decoder
Encode or decode a URL component safely.
Open tool Developer ToolsUnix Timestamp Converter
Convert Unix seconds, milliseconds and local dates.
Open tool Security & GeneratorsUUID Generator
Generate random version 4 UUIDs using browser cryptography.
Open tool Developer ToolsRegex Tester
Test JavaScript regular expressions and inspect matches.
Open tool Security & GeneratorsJWT Decoder
Inspect JWT headers and payloads locally.
Open tool Security & GeneratorsPassword Generator
Create random passwords with configurable character sets.
Open tool Text ToolsWord & Character Counter
Count words, characters, sentences and reading time.
Open tool Utility ToolsQR Code Generator
Create QR codes locally and download PNG images.
Open tool Encoding & ConversionColor Converter
Convert HEX, RGB and HSL colors with a live preview.
Open tool Flutter & Dart ToolsFlutter Color Converter
Convert HEX and RGB to Flutter ARGB color literals.
Open tool Flutter & Dart ToolsJSON to Dart Converter
Generate null-safe Dart models from a JSON object.
Open tool Flutter & Dart ToolsDart / Flutter Package Name Generator
Turn project names into valid Dart package names.
Open tool Developer ToolsYAML to JSON Converter
Convert YAML maps and sequences to indented JSON with local syntax checks.
Open tool Developer ToolsJSON to YAML Converter
Convert valid JSON into readable YAML configuration without uploading data.
Open tool Developer ToolsXML Formatter
Pretty-print XML with basic validation and readable nested elements.
Open tool Developer ToolsHTML Formatter
Format HTML source as inert text with two- or four-space indentation.
Open tool Developer ToolsCSS Minifier
Minify CSS with a local parser while preserving strings and important comments.
Open tool Developer ToolsJavaScript Minifier
Minify JavaScript locally with Terser without evaluating the supplied code.
Open tool Security & GeneratorsSHA Hash Generator
Generate SHA-256, SHA-384 or SHA-512 hex digests from UTF-8 text locally.
Open tool Security & GeneratorsRandom String Generator
Generate configurable random strings for test data and development identifiers.
Open tool Flutter & Dart ToolsFlutter EdgeInsets Generator
Generate Flutter EdgeInsets.all, symmetric, only and fromLTRB expressions.
Open tool Flutter & Dart ToolsFlutter BorderRadius Generator
Generate circular or per-corner Flutter BorderRadius expressions.
Open tool Flutter & Dart ToolsFlutter BoxShadow Generator
Generate Flutter BoxShadow code from color, opacity, blur, spread and offset.
Open tool Flutter & Dart ToolsDart DateTime Converter
Convert ISO dates or Unix timestamps to Dart DateTime code and epoch values.
Open tool AI & LLM ToolsLLM Token Counter
Estimate prompt tokens, words and characters locally to plan context-window use before sending text to a language model.
Open tool AI & LLM ToolsAI API Cost Calculator
Turn input and output token counts and per-million prices you enter into per-request and multi-request cost estimates.
Open tool AI & LLM ToolsJSON to JSON Schema Generator
Generate a draft JSON Schema from a sample JSON document, with nested objects, arrays and an optional required-fields toggle.
Open tool AI & LLM ToolsLLM JSON Repair
Fix common invalid JSON from language models: Markdown fences, surrounding prose, trailing commas and smart quotes, without guessing.
Open tool AI & LLM ToolsPrompt Template Builder
Write a prompt with {{variables}}, fill the detected fields or paste JSON values, and copy the finished prompt. Plain replacement only.
Open tool AI & LLM ToolsRAG Text Chunker
Split text into overlapping chunks by characters, words or estimated tokens for retrieval-augmented generation, and copy any chunk.
Open tool AI & LLM ToolsAI Prompt Redactor
Mask emails, phone numbers, IP addresses, tokens, API-key-like strings and card-like numbers in a prompt before sharing it.
Open tool AI & LLM ToolsMCP Config Generator
Generate a basic mcpServers JSON configuration for a Model Context Protocol server with command, args, environment placeholders or a URL.
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