Start with the destination, not the syntax
A person pasting into Telegram's normal composer is not doing the same thing as a bot sending a message with a parse mode. The app composer uses native formatting entities and its own formatting menu. Regular Bot API messages can use MarkdownV2 or HTML, while Telegram's newer rich messages support much deeper document structure.
Copying bot syntax into the normal composer can leave escapes and marker characters visible. Copying generic Markdown into a MarkdownV2 API request can fail because reserved characters were not escaped.
Telegram: styled text and message entities · Telegram Bot API · Open Markdown to Telegram
Normal app paste
For an ordinary message, use semantic rich clipboard content with a plain-text fallback. Keep headings short, flatten tables into labelled rows and avoid manufacturing mention entities. Telegram may detect a visible @username, URL or hashtag, but identity-bound entities belong to the client or API.
After pasting, check nested emphasis, code and links in the composer. The preview is a guide; the current Telegram client is the final test.
Regular Bot API messages
Telegram documents MarkdownV2 and HTML for lightweight bot messages. These formats require exact escaping and message-length handling. A generic Markdown document is not automatically valid MarkdownV2.
Use a dedicated API renderer that knows the selected parse mode. Do not run a broad character replacement after generating entities, because offsets and escapes can then disagree.
Rich bot messages
Telegram's rich-message format now covers headings, lists, tables, quotations, formulas and nested inline styles. It is closer to a document renderer than a chat paste. That makes it a strong future export target, but it needs a typed payload and API integration rather than clipboard text.
Pasteful's current Telegram preset targets the normal composer. Keeping that boundary explicit avoids presenting a convenient preview as an API-valid payload.
Paste it into Pasteful. It stays in this tab.