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.
- 22 free tools
- 0 sign-ups
- English & Português
Popular tools
- QR Code GeneratorLinks, text, Wi-Fi, email, phone, SMS and contact cards — the code updates as you type.
- Image CompressorDrop up to 50 JPG, PNG, WebP or GIF images and see each one's savings.
- Background RemoverA segmentation model finds the subject and removes everything else.
- JSON Formatter & ValidatorPretty-print with two-space indentation or compact JSON to a single line.
- Password GeneratorBuilt on crypto.getRandomValues, the browser's secure random generator.
- UTM Link GeneratorPick source and medium from common presets so your campaign reports stay clean.
All tools
URL Encoder & Decoder
Percent-encode text for safe URLs, or decode an encoded string back to readable text.
Open toolBase64 Encoder & Decoder
Encode text and images to Base64, or decode a Base64 string back to its original form.
Open toolHTML Text Encoder & Decoder
Turn special characters into HTML entities so they render literally — or decode entities back to text.
Open toolHTML Beautifier
Reindent and tidy messy or minified HTML so it is readable again.
Open toolPomodoro Timer
Focus in 25-minute blocks with short breaks, and track how many you complete.
Open toolQR 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.
Open toolWhatsApp Link Generator
Build a wa.me link that opens a chat with your number and an optional pre-filled message.
Open toolUTM Link Generator
Add consistent utm_source, utm_medium and utm_campaign tags to a link so analytics can attribute the traffic.
Open toolMailto Link Generator
Build a mailto: link with recipient, subject, body, CC and BCC already filled in.
Open toolImage Compressor
Shrink JPG, PNG, WebP or GIF images in your browser, one or many at once, and compare before downloading.
Open toolAdvertisement
KoarisWhy 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:
Questions
Are Koaris tools really free?
Is my data uploaded anywhere?
Do I need to install anything?
Can I suggest a new tool?
Free tools, professional results
Missing something? Tell us what you need and we'll consider building it.
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