Reddit Drafts

Write a post here, then open it on Reddit with everything filled in. Check it and press Post. Nothing is sent anywhere; drafts stay in this browser.

Drafts

Nothing here.

Tips

Several accounts: switch to the right account on Reddit before you press Post. The "Post as" field on each draft reminds you which one.
Old vs new Reddit: "Open" uses old.reddit.com, which fills in title and body reliably. If you prefer the new site, use "New Reddit". If something doesn't fill in, use the Copy buttons.
Phone: if links open the Reddit app, long-press and choose "open in browser".