Utility tools for humans and agents

Small, deterministic tools — each with a human UI, REST API, OpenAPI schema, and MCP server entry. Free to use. Agent-native from day one.

Browse all tools

Featured tools

encoding
JWT Decoder
Decode and verify JSON Web Tokens — header, payload, claims, and signature.
formatting
JSON Formatter
Pretty-print or minify JSON — with syntax validation.
conversion
Image Converter
Convert images between PNG, JPEG, WebP, AVIF, TIFF, GIF, and SVG formats
conversion
Background Remover
Remove image backgrounds instantly with AI — returns a transparent PNG
validation
LCOV Coverage Viewer
Parse and visualize LCOV code coverage reports — line, function, and branch coverage per file.
conversion
Image Resizer & Cropper
Resize, crop, rotate, and flip images online — free, runs in your browser, no upload required.
encoding
Base64 Encoder / Decoder
Encode text or data to Base64, or decode Base64 back to plain text.
cryptography
Hash Generator
Generate MD5, SHA-1, SHA-256, SHA-384, or SHA-512 hashes from any text input.
encoding
URL Encoder / Decoder
Encode or decode URLs and query string components using percent-encoding (RFC 3986).
datetime
Unix Timestamp Converter
Convert Unix timestamps to human-readable dates and ISO 8601, or convert dates back to epoch seconds.
generation
UUID Generator
Generate one or more cryptographically random UUID v4 identifiers instantly.
text
Text Case Converter
Convert text between camelCase, snake_case, kebab-case, PascalCase, and 7 other naming conventions.
formatting
JSON to CSV Converter
Convert a JSON array of objects to CSV, or parse CSV back to JSON.
conversion
Color Converter
Convert colors between HEX, RGB, HSL, and HSV — instantly and in any direction.
encoding
Number Base Converter
Convert numbers between binary, octal, decimal, and hexadecimal.

For AI agents

  • GET /openapi.json — OpenAPI 3.1 for all tools
  • GET /llms.txt — llms.txt discovery surface
  • POST /api/<slug> — REST API, JSON in/out
  • MCP — same registry, stdio or HTTP
OpenAPI specllms.txt

What is quickhelp.dev?

quickhelp.dev is a collection of small, focused developer tools that do exactly one thing well. Each tool is free to use — no account, no rate limit for normal use. You can use any tool through its web interface, call it directly as a REST API, discover it through an OpenAPI 3.1 schema, or register it as an MCP tool inside Claude, Cursor, or any MCP-compatible agent.

The tools are deterministic: given the same input, they always produce the same output. There are no black-box AI models deciding the result — just well-defined transformations like decoding a JWT, formatting JSON, converting an image, or removing a background. That predictability makes them reliable for automated workflows, CI pipelines, and AI agents that need a tool they can trust.

Three ways to use every tool

Human UI

Visit the tool page, fill in the form, click Run. Results appear instantly and can be copied with one click. No sign-up, no tutorial.

REST API

Every tool has a POST /api/<slug> endpoint that accepts JSON and returns JSON. No API key required for standard use. Integrate it into any script, workflow, or application.

MCP server

Add quickhelp.dev to Claude Desktop or any MCP-compatible agent. All tools are registered automatically — the agent can discover and call them without extra configuration.

Why deterministic tools?

AI agents work best with tools that are predictable. A tool that decodes a JWT should always return the same header and payload — not a summary, not a paraphrase, not a hallucination. quickhelp.dev tools are built with that contract in mind: strict JSON schemas for inputs and outputs, no side effects, no state between calls.

Every tool exposes its input and output shapes via OpenAPI 3.1, which means agents using the OpenAPI spec can validate inputs before calling and parse outputs without guesswork. The llms.txt file at the root of the domain gives language models a structured overview of what each tool does, how to call it, and what to expect back.

From the blog

In-depth guides on the formats and techniques these tools are built around.

All articles →

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