CPYNET — Online Clipboard for Copy-Paste Sharing via curl

CPYNET
TREN
On Windows PowerShell, type curl.exe instead of the curl alias — otherwise long pastes get truncated in the console.
terminal
$

Set up a persistent alias (once)

curl -s https://llmtag.com/alias -o ~/.cpy.sh && bash -n ~/.cpy.sh && (grep -qxF 'source ~/.cpy.sh' ~/.bashrc || echo 'source ~/.cpy.sh' >> ~/.bashrc) && source ~/.cpy.sh || echo "install failed, try again"

Then just: command | cpy — prints the 6-digit code and a ready-to-run curl command on two lines. To protect it with a password: command | cpy -password=xxx

Send from the terminal

command | curl --data-binary @- https://llmtag.com/

The response is a bare, ready-to-use link.

Read from the terminal

curl "your-link"

Read once, then permanently deleted.

Protect with a password

Fill in the password box below — the link automatically comes with ?p=password.

Frequently Asked Questions

How many times can a code be used?

Just once. It's permanently deleted from the server the instant it's read.

What happens when the timer runs out?

Even if nobody reads it, the paste is automatically deleted - no trace left on the server.

How do I use it when my clipboard is disabled?

CPYNET never touches the clipboard at all - everything moves through curl from the terminal, so a disabled clipboard doesn't matter.

Does the server see or store what I paste?

The text is only kept in memory, never written to disk - it's permanently deleted the moment it's read or the timer runs out. If password-protected, it's kept encrypted with AES-256-GCM.

Does it work on Windows?

Yes - in PowerShell, type curl.exe instead of the curl alias, otherwise long text can get truncated in the console.

What's the max size and code length?

Up to 2 MB, a 6-digit code, auto-deletes within 2m (default settings).

Why CPYNET?

Built for environments where clipboard sharing isn't an option: remote servers over SSH, machines where clipboard access is locked down by policy, or separate machines/containers/virtual desktops with no shared clipboard between them. CPYNET never touches the OS clipboard at all - everything moves as plain text over curl - so it can be used confidently even where clipboard is fully disabled.

Features

  • One-time read: permanently deleted the moment it's read
  • Auto-deletes when the timer runs out, even if nobody reads it
  • Password-protected sharing: AES-256-GCM + PBKDF2, the server only ever holds plaintext momentarily
  • Live notification: your tab knows the instant it's read (SSE)
  • Per-IP rate limiting: guards against code-guessing and brute-force scans

Security

The server never executes, evaluates, or pipes what you paste into a shell - it only stores it and hands it back exactly as received. No third-party dependencies (pure Go standard library), no filesystem access with user data, no outbound requests.

⚠️ Disclaimer: this doesn't remove the risk of piping something into a shell (curl ... | bash) without reading it first - that's a universal risk for any sharing tool, not specific to this one. Never run a command you haven't inspected from a source you don't trust.

Limits

Max size: 2 MB · Code: 6 digits · Auto-delete: 2m

CPYNET v1.0 — single file, single Go binary — no external database or dependencies.

Made by Emin Buyuk