Koaris Tools

Fast, free, no sign-up tools for everyday web and marketing work — each one runs right in your browser.

URL Encoder & Decoder

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

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

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

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

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

Turn any URL or text into a high-resolution QR code and download it as a PNG.

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

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

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

Shrink a JPG, PNG or GIF in your browser and compare the result side by side before downloading.

Cut the background out of a photo in your browser and download it as a transparent PNG.

Turn one square image into every favicon a site needs, with the matching <head> markup and web manifest.

Enter a URL to score its on-page SEO and how ready the page is to be cited by AI answer engines.

Missing something? Tell us what you need and we'll consider building it.