Koaris Tools

Free online tools for developers and marketers

Encode, format, generate and optimise in seconds. No sign-up, no installs — most tools run entirely in your browser, so your data stays on your device.

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  • 23 free tools
  • 0 sign-ups
  • English & Português

All tools

OG Preview Checker

Inspect a public URL’s sharing metadata and approximate Facebook, LinkedIn, X, and WhatsApp previews.

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URL Encoder & Decoder

Percent-encode text for safe URLs, or decode an encoded string back to readable text.

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Base64 Encoder & Decoder

Encode text and images to Base64, or decode a Base64 string back to its original form.

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HTML Text Encoder & Decoder

Turn special characters into HTML entities so they render literally — or decode entities back to text.

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HTML Beautifier

Reindent and tidy messy or minified HTML so it is readable again.

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Pomodoro Timer

Focus in 25-minute blocks with short breaks, and track how many you complete.

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QR Code Generator

Make a QR code for a link, text, Wi-Fi network, email, phone number, SMS or contact card, and download it as SVG or a high-resolution PNG.

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WhatsApp Link Generator

Build a wa.me link that opens a chat with your number and an optional pre-filled message.

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UTM Link Generator

Add consistent utm_source, utm_medium and utm_campaign tags to a link so analytics can attribute the traffic.

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Mailto Link Generator

Build a mailto: link with recipient, subject, body, CC and BCC already filled in.

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Koaris

Why Koaris

  • Private by design

    Most tools process everything locally in your browser. Nothing is uploaded unless a tool clearly needs a server.

  • Free, no strings

    No account, no trial, no usage cap. Open a tool and get the job done.

  • Fast and focused

    Each tool does one job well, loads quickly and works on desktop and mobile.

Browser extension

Your favourite tools, one click away

The Koaris Tools extension searches every tool from your toolbar and runs 8 of them offline, right in its popup:

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Questions

Are Koaris tools really free?
Yes. Every tool is free to use with no sign-up, no trial and no usage cap. The site is supported by a small ad at the bottom of each page.
Is my data uploaded anywhere?
Most tools run entirely in your browser, so your text, images and files never leave your device. The few that need a server, like the SEO & GEO Analyzer, say so on the page and process inputs transiently without intentionally storing them.
Do I need to install anything?
No. Every tool works in a modern browser on desktop or mobile. If you use some tools often, the optional Chrome extension runs them offline from your toolbar.
Can I suggest a new tool?
Yes — use the contact page to tell us what you need. Suggestions shape what we build next.

Need something built for your business?

We build custom systems and AI automations, and we take tool suggestions too. Tell us what you need.

Get in touch

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