CoShareX Paste vs Pastebin: Which Is Better for Sharing Code and Notes?

Introduction

For over two decades, developers have relied on Pastebin to share logs, code snippets, and configuration variables. However, legacy pastebins store all inputs as plain text in centralized databases. CoShareX Paste redefines text sharing by combining markdown rendering with client-side cryptographic keys.

Symmetric Encryption vs Public Database Records

Pastebin saves plain text records to public database clusters, making them indexed by search engines and scraping bots. CoShareX Paste generates local 256-bit AES-GCM keys. The raw text is encrypted inside the browser tab before transmission. The key is appended to the sharing URL as a hash fragment (#) that is never sent to the server. Only users with the complete URL can decrypt and read the paste.

When password protection is enabled, CoShareX utilizes a client-side Key Derivation Function. It runs PBKDF2 using SHA-256 with 100,000 iterations and a local salt, deriving a secure key. This process runs entirely in the browser sandbox, protecting your passwords from server interception.

Encryption Code Snippet

Below is the actual Web Cryptography API sequence used to encrypt text payloads client-side before transmission:

// Derive encryption key from password and salt
async function deriveKey(password: string, salt: Uint8Array) {
  const baseKey = await crypto.subtle.importKey(
    "raw",
    new TextEncoder().encode(password),
    "PBKDF2",
    false,
    ["deriveKey"]
  );

  return crypto.subtle.deriveKey(
    {
      name: "PBKDF2",
      salt: salt,
      iterations: 100000,
      hash: "SHA-256"
    },
    baseKey,
    { name: "AES-GCM", length: 256 },
    true,
    ["encrypt", "decrypt"]
  );
}

Markdown & Syntax Highlighting

Legacy pastebins output raw text or basic, unformatted blocks. CoShareX Paste compiles markdown directly in the browser, rendering markdown text, lists, alerts, tables, and multi-language syntax highlighting automatically. This makes it an ideal sandbox for code reviews and documentation handoffs.

Feature Analysis

Expiration & Sharing Workflows

CoShareX Paste is designed for ephemeral sharing. Pastes can be configured to self-destruct after the first read or expire after a set time. Combined with browser-native crypto keys, this prevents sensitive keys, configuration environments, or logs from lingering online indefinitely.

This client-side model also protects the system from SQL injection attacks. Since the backend database only receives and stores encrypted, base64-encoded strings without parsing them, SQL injection is physically impossible.