Zero Width Shortener (abbreviated as ZWS) is a URL shortener that shortens URLs using spaces that have zero width, making them invisible to humans.
We've done a bit of research on what characters work on different platforms
Character | In use | Twitter | iMessage* | Discord | Slack | Telegram | Notes |
| ✔️ | ❌ | ❌ | ✔️ | ❌ | ✔️ | Used in URLs since initial release, blacklisted space character on Twitter |
| ✔️ | ❌ | | ✔️ | | ✔️ | Discord prompts you with a "spoopy URL" popup when clicked |
| ❌ | ❌ | | ✔️ | | ❌ | Blacklisted space on Twitter, discontinued (previously used, replaced with |
| ❌ | ❌ | ❌ | ✔️ | | ❌ | Visible on iOS, discontinued in b39897e (previously used, replaced with |
| ❌ | ❌ | | ✔️ | | ✔️ | |
iMessage note: Tested on latest beta of iOS