Short.io allows you to create short links using your own domain (e.g www.longlonglonglong.com/morecharacters becomes www.yourdomain.com/euh4F)To make link shortener work you need to have an account in Short.io with any domain. After installing the Short.io Slack app, connect a domain in Settings → Integrations → Slack, and you can create short links by simply writing /shorten http://longlonglong.com/long and service will respond with a short URLThe app also turns a link into a QR code (/qr), collects several links into one shareable bundle page (/short-bundle) and publishes a Markdown post on your domain (/short-post)Short.io has a free plan that is enough for most of the projects, and paid plans for higher limits, more domains and team members — see https://short.io/pricing