Why mockup a post before publishing?

Every platform wraps your content in its own chrome — avatar circle size, handle color, timestamp placement, image aspect crop, link card height, character truncation point. What looks tight in your drafting tool often breaks in the wild: a line that fits in Notes gets truncated on Twitter after 280 characters; a square image looks fine on Instagram but crops ugly on LinkedIn's 1.91:1 aspect; a thread preview on Threads hides content after two lines. A mockup shows the truth before you hit Post.

Are the mockups pixel-accurate?

The card chrome — avatar shape, name weight, handle color, timestamp format, icon row, padding, border radius — is reproduced from each platform's current post card design as of April 2026. X uses 15px body text with a 40px avatar; Instagram uses a 32px avatar above a square image; LinkedIn uses a 48px avatar with role line and timestamp with globe icon; Threads mimics X chrome with Meta's typography; Facebook uses a 40px avatar with 'shared a post' language.

Does it export as a real image file?

Yes. The Export PNG button renders the platform card to an HTML5 canvas using html2canvas and downloads a PNG file at native retina resolution (2x pixel density). There's also a Copy to Clipboard option that writes the PNG directly to your clipboard so you can paste into Slack, Figma, Keynote, or a chat without saving a file first.

Is my avatar uploaded anywhere?

No. Avatars are read into a browser File API object and rendered directly onto the mockup card. Nothing uploads to a server, nothing logs, nothing persists after you close the tab. Everything — avatar, handle, post text, attached image, exported PNG — stays on your machine.

What platforms are supported?

X (Twitter), Instagram (feed post with single image), LinkedIn (personal post), Threads (text + optional image), Facebook (personal post). Not yet supported: TikTok, YouTube Shorts, Pinterest, Mastodon / Bluesky, Discord. We cover the five platforms that marketers and designers most commonly pitch posts for.

Can I use real celebrity avatars or brand logos?

The tool allows any image upload — but uploading a brand logo or a real person's photo and publishing the resulting mockup can raise right-of-publicity, trademark, or defamation issues depending on context. For design comps, internal decks, and private critique, it's generally fine. For public posts — especially ones that attribute statements or opinions to a real person or brand — be cautious.

How to Mockup a Social Media Post (2026)

📱

Try Social Post Mockup

Free, no signup →