fluttersSmall tools. Less friction.
Your everyday developer toolkit

Free Online Developer
& Utility Tools

Fast, private and easy-to-use tools for developers, programmers and everyday tasks.

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JSON, with a little breathing room.{ }
{
  "name": "Flutters",
  "tools": 35,
  "cost": "free",
  "processing": "in your browser"
}
Valid JSON · Ready to build something.
✓ Free to use✓ No account required✓ Local browser processing✓ No installation

Popular tools

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Developer Tools

JSON Formatter & Validator

Format and validate JSON with readable indentation.

Open tool Encoding & Conversion

Base64 Encoder & Decoder

Encode and decode UTF-8 text without losing Unicode.

Open tool Developer Tools

Unix Timestamp Converter

Convert Unix seconds, milliseconds and local dates.

Open tool Security & Generators

UUID Generator

Generate random version 4 UUIDs using browser cryptography.

Open tool Developer Tools

Regex Tester

Test JavaScript regular expressions and inspect matches.

Open tool Security & Generators

Password Generator

Create random passwords with configurable character sets.

Open tool Flutter & Dart Tools

Flutter Color Converter

Convert HEX and RGB to Flutter ARGB color literals.

Open tool Flutter & Dart Tools

JSON to Dart Converter

Generate null-safe Dart models from a JSON object.

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Find your toolkit

AI & LLM developer tools

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AI & LLM Tools

LLM 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 Tools

AI 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 Tools

LLM JSON Repair

Fix common invalid JSON from language models: Markdown fences, surrounding prose, trailing commas and smart quotes, without guessing.

Open tool AI & LLM Tools

JSON 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 Tools

RAG Text Chunker

Split text into overlapping chunks by characters, words or estimated tokens for retrieval-augmented generation, and copy any chunk.

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Why Flutters?

Less setup.
More getting things done.

Keep your input local

Tool calculations run directly in your browser.

Open and use

No accounts, subscriptions or installation.

Built to stay lightweight

Focused pages without a heavy app shell.

Works on your phone

Useful controls and readable output on smaller screens.

Recently added

Explore Flutter & Dart →
Flutter & Dart Tools

Flutter EdgeInsets Generator

Generate Flutter EdgeInsets.all, symmetric, only and fromLTRB expressions.

Open tool Flutter & Dart Tools

Flutter BorderRadius Generator

Generate circular or per-corner Flutter BorderRadius expressions.

Open tool Flutter & Dart Tools

Flutter BoxShadow Generator

Generate Flutter BoxShadow code from color, opacity, blur, spread and offset.

Open tool Flutter & Dart Tools

Dart DateTime Converter

Convert ISO dates or Unix timestamps to Dart DateTime code and epoch values.

Open tool

Useful guides

Practical notes on JSON, Unix time and Flutter color values are planned. Each tool already includes examples, limitations and instructions.

Visit the guide library →

A small toolkit for the work between the work

Inspect an API response, turn a timestamp into a readable date, or convert a design color into a Flutter literal. Flutters brings these everyday tasks together in focused browser tools, with examples that explain what the output means.

Start with the developer collection for JSON, encoding and debugging. The Flutter & Dart collection covers model generation, colors and package naming, while utility tools help with text and QR codes. All tools process input locally; optional advertising and analytics are described in our privacy policy.