NO CREDIT CARD REQUIRED
Free social media tools for people who post.
Each one runs entirely in your browser, on the same code that powers the editor in our platform. Check out how LetterBox will work for you without even signing up.
Post preview
See how your post is rendered on X, Bluesky, Threads and LinkedIn, each counted against its own char limit.
Open toolCharacter counter
Count one post against all six platform limits at once, and see which character makes X disagree with the rest.
Open toolLinkedIn above the fold checker
Find where "…see more" cuts your LinkedIn post, helping you optimize your hook.
Open toolWHEN YOU'RE READY
The same logic powers our platform. No surprises.
LetterBox writes, previews and schedules to X, Bluesky, Threads and LinkedIn from one place, so you only draft a post once.
Start writing free →No credit card · Free for your first 30 posts each month