How to Format Telegram Posts Without Errors
- Type or Paste Message: Compose your message in the editor or paste drafts from notes.
- Apply Formatting: Select text and use toolbar buttons for bold, italic, spoilers, or code blocks.
- Click Auto-Escape: If using MarkdownV2, click "⚡ Auto-Escape" to automatically prepend backslashes before reserved characters like periods (
\.), dashes (\-), and brackets. - Copy Bot Code: Switch to the API Code tab to copy tested code for Python (aiogram) or Node.js (grammY).
Why Telegram MarkdownV2 Fails (and How to Fix It)
In Telegram's Bot API, MarkdownV2 requires 18 specific ASCII characters to be escaped with a preceding backslash (\) inside regular text:_ * [ ] ( ) ~ ` > # + - = | { } . !
If any of these characters appear unescaped in your message, Telegram returns HTTP 400 with:Bad Request: can't parse entities: Character '_' is reserved and must be escaped with the preceding '\'Our tool automatically sanitizes your text with one click so your bot dispatches reliably every time.
Frequently Asked Questions
How does the Telegram Post Previewer format message entities?▼
The tool accurately emulates Telegram's native client parser. It renders bold (*text*), italic (_text_), underline (__text__), strikethrough (~text~), interactive spoiler text (||spoiler||), inline code (`code`), preformatted code blocks, and markdown links [label](url) with exact pixel font sizing.
Why does Telegram Bot API throw 'can't parse entities: Character ... is reserved'?▼
Telegram's MarkdownV2 requires escaping 18 reserved punctuation characters (_, *, [, ], (, ), ~, `, >, #, +, -, =, |, {, }, ., !) with a backslash whenever they appear outside code blocks. Our tool has a 1-click 'Auto-Escape MarkdownV2' feature that sanitizes all reserved characters automatically.
Can I simulate Telegram inline keyboard buttons and copy Bot API code?▼
Yes! You can add URL and Callback inline keyboard buttons and see how they render below the message bubble. You can also switch to the Code Studio tab to get ready-to-use snippets for Python aiogram, Node.js Grammy / Telegraf, and raw cURL.
Does the previewer support Dark and Light Telegram themes?▼
Yes. You can toggle between Telegram Dark Mode (#18222d bubble on #0e1621) and Light Mode (#eeffde bubble on #8fa6ba) to test visual readability and contrast before broadcasting.