Free online tools to simplify
your everyday tasks.
Convert, generate, calculate and format — hundreds of fast, private little tools that run right in your browser. No installs, no accounts, no cost.
Most popular tools
Browse by category
Small tools, done right
100% free, forever
Every tool. No paywalls, no trials, no “premium” tier hiding the good stuff.
No sign-up needed
Open a tool and start working in seconds. No account, no email, no friction.
Private by design
Most tools run in your browser. Your files and text never leave your device.
Lightning fast
Lightweight, single-purpose tools built to give you results instantly.
Every tool, everywhere
Call tools over REST, plug them into agents through MCP, or keep them a keyboard shortcut away with the browser extension.
Developer API
One REST endpoint per tool with request and response schemas derived automatically — plus a full OpenAPI 3.1 spec.
POST /v1/tools/caesar-cipher
{ "inputs": { "ioInputText": "Hello", "ioShift": "13" } }
→ { "outputs": { "ioOutput": "Uryyb" } }MCP server
Plug every tool into Claude, agents and MCP-compatible clients as native tool calls — same logic, zero glue code.
"mcpServers": {
"iotools": { "url": "https://mcp.iotools.cloud" }
}
→ 500+ tools available to your agentEmbeddable widgets
Drop any tool into your site with one line of HTML. It's fully responsive, auto-resizes to fit its container, and stays up to date.
<iframe
src="https://iotools.cloud/embed/json-formatter/"
width="100%" height="520"
></iframe>Browser extension
Search every tool from any tab — no trip back to iotools.cloud first.
