A minimalist, permanent URL shortener that runs entirely on Cloudflare's edge network.
No servers to maintain, no cron jobs, no expiration dates.

• Turns long URLs into short, memorable aliases such as 4ev.link/github

• Lets every account reserve custom slugs

• Serves redirects from Cloudflare's global edge—usually under 50 ms

• Costs nothing on the free tier (1 M requests + 1 GB KV reads / month)

  

• Cloudflare Workers – serve requests at the edge
• D1 (SQLite) – store user hashes and slug lists
• KV – key/value lookups for lightning-fast redirects
• reCAPTCHA v2 – stop bots from burning your quota

1. Clone the repo
2. Create a D1 database named D1_EV and a KV namespace named KV_EV
3. Add the secret RECAPCHA_KEY (Google reCAPTCHA v2 secret)
4. npx wrangler deploy

That's it—your own instance is live.

npm install -g wrangler   # if you don't have it
wrangler dev              # serves on localhost:8787

Create:

curl -X POST 127.0.0.1:8787/api/links/create \
  -H 'content-type: application/json' \
  -d '{"username":"bob","pass_hash":"<scrypt-hash>","destination_url":"https://example.com/very/long","slug":"ex","g-recaptcha-response":"<token>"}'

List:

curl -X POST 127.0.0.1:8787/api/links/list \
  -H 'content-type: application/json' \
  -d '{"username":"bob","pass_hash":"<scrypt-hash>"}'

• Client-side scrypt stretching (N=16384, r=8, p=1, 32 B) before the request ever leaves the browser
• All write endpoints require a fresh reCAPTCHA token
• Reserved-word blacklist prevents hijacking of paths such as api, dash, admin, etc

• 100 000 Worker requests/day
• 1 GB KV reads/day
• 1 GB KV writes/month
• 1 GB D1 storage

For personal or small-team usage this is effectively unlimited.

MIT – do whatever you want, just don't blame us.

Issues and pull requests are welcome. Open a private security advisory first if you find anything sensitive.