Check a Markdown draft before you paste it into a publishing editor.

One draft, five destination-specific handoffs. Every change and every loss is named, with a link to the dated live test it came from. Your draft never leaves this browser.

Open the checker

Destinations tested

• WordPress - Gutenberg paste. Tested in WordPress.com desktop Block Editor on 2026-08-24.
• Substack - Rich HTML clipboard. Tested in Substack web post editor on 2026-08-24.
• Beehiiv - Clean Markdown paste. Tested in Beehiiv web Visual Editor on 2026-08-24.
• X - Plain text. Tested in X web post and thread composer on 2026-08-24.
• LinkedIn - Plain text. Tested in LinkedIn desktop web Create post composer on 2026-08-24.

Evidence

• All five destinations compared, construct by construct
• How these tests are run, and what they cannot tell you
• Substack vs Beehiiv for a Markdown workflow
• What happens to your draft