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.

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.

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 JPG, PNG, WebP or GIF images in your browser, one or many at once, and compare before downloading.

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

Turn one image or SVG into a complete favicon set, including a real multi-size favicon.ico, a maskable Android icon and the matching <head> markup.

Enter a URL for weighted SEO and GEO diagnostics covering search, crawler access, and AI-readable structure.

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