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.
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A request is failing and the error message isn't telling you why. These eleven tools take you from rebuilding the call by hand to reading the response, decoding the token and reproducing the whole thing — all in your browser, nothing uploaded.
Fourteen tools covering the whole lifecycle — get things into a PDF, rearrange and clean up the pages, lock or unlock it, then get the content back out into Word, Excel, PowerPoint or images. All processed in your browser, so contracts and statements never leave your machine.
Eighteen tools for the things people mix up daily — encoding versus encryption, which hash belongs on a password, and what an HMAC is actually for. Everything runs in your browser, so nothing you paste is uploaded.
Eleven tools for the two-minute tasks that break your focus — scheduling across time zones, sharing a link as a QR code, working out a date, splitting a bill, writing down something you'll need in ten minutes. No account, no app to install.
You've been handed a blob of JSON — an API response, a config file, a sample payload — and you need to trust its shape. These twelve tools take you from making it readable, through finding what's actually inside it and giving it real types, to reshaping it into whatever comes next. Everything runs in your browser, so nothing you paste is uploaded.
A QR code for a menu, a business card, a flyer or a product has to survive being branded and being printed small — two things that quietly break scanning. These six tools take you from getting the payload right, through adding a logo without exceeding the error-correction budget, to proving the finished code still reads at its real physical size.
You have a raw image — a phone photo, a screenshot, a design export — and it isn't ready to ship: wrong format, far too heavy, carrying metadata that shouldn't be public, and served as one giant file to every device. These eight tools take it from that state to a responsive, privacy-clean asset, all in your browser.
Thirteen tools for the mess in pasted text — line endings from the wrong OS, an unknown encoding, two versions you can't tell apart, inconsistent casing, and lengths that don't match where the text is going. Everything runs in your browser, so nothing you paste is uploaded.
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.
