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Meta Business Partner
100% Official API
Instagram Post Mockup for Desktop
This tool builds an Instagram post mockup for desktop: the lightbox that opens on instagram.com, with the photo on the left, caption and comment thread on the right, dark backdrop behind. Write your own comments, flip the theme, and download the whole modal as one PNG. Nothing leaves your browser.
Customize the Modal
Verified
Dark mode
Profile photo
Post image
Add Comments
Live Preview
Upload your post image
8,742 likes
March 14
Add a comment… Post
Downloads the full lightbox at 2x resolution. Works best in Chrome or Edge.
How the Desktop Post Mockup Works
1
Set up the post
Username, verified badge, profile photo, post image, caption, likes, timestamp. The whole desktop layout updates live as you type.
2
Write the comments
Add unlimited comments with custom usernames, text, like counts, and times. Each commenter gets a colored avatar automatically.
3
Pick the theme
Switch between Instagram's light and dark desktop themes. The dark lightbox backdrop stays, just like the real site.
4
Download the PNG
Export the entire modal, backdrop included, at 2x resolution. It drops straight into a slide or tutorial screenshot.
Desktop Modal vs Mobile Feed
Instagram renders the same post very differently on desktop and in the app. If you searched for an Instagram web post generator, this page makes the desktop version; here is how the two layouts differ and when each one fits.
The desktop lightbox
On instagram.com, clicking a post opens a modal over a dark backdrop: media on the left, and a right-hand panel where the caption appears as the first "comment", followed by the comment thread, action row, like count, and comment box.
The mobile feed card
In the app, the post is a vertical card: header, full-width media, action row, likes, then caption. Comments live on a separate screen. Use our fake Instagram post generator for that layout.
When to use this mockup
The desktop modal is ideal for client decks, comment-strategy examples, tutorials, and courses. The wide comment panel makes conversations easy to read on a slide.
Comments are the conversion
Comment sections are where buying intent shows up. Brands that reply fast (or automatically, with a tool like InstantDM) turn commenters into DM conversations and customers.
Worth saying once: this is a mockup for decks, tutorials, and design work, not a way to fabricate a conversation and present it as a real screenshot of an actual person's post.
Reply to Every Comment, Automatically
Comment threads like the one you just mocked up are where buyers raise their hands. InstantDM replies to comments and follows up in DMs from your real account. Meta Business Partner, free plan with 500 DMs/month, paid plans from $9.99/month.
More Free Instagram Tools
Fake Instagram Post Generator
The mobile feed version of this mockup, with its own likes and caption.
Fake Instagram Profile Generator
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Instagram Comment Sticker Generator
Turn one comment into a transparent PNG sticker for Reels.
Instagram Post Preview
See a real post, reel, or story exactly as it will appear before publishing.
Frequently Asked Questions
The post modal is the desktop lightbox that opens when you click a post on instagram.com: the image sits on the left and a panel with the caption, comments, likes, and comment box sits on the right, over a dark backdrop.
Yes. Completely free, no sign-up, no watermark. Everything runs in your browser and nothing is uploaded to a server.
Yes. Add as many fake comments as you want, each with its own username, text, like count, and time. Each commenter gets an automatically colored avatar, and you can remove any comment with one click.
Click Download PNG under the preview. The whole lightbox, dark backdrop included, is rendered at 2x resolution. The download works best in Chrome or Edge.
This tool intentionally recreates the desktop web lightbox, which is what people see when they browse instagram.com on a computer. If you need the mobile feed look instead, use our Fake Instagram Post Generator.
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