Is MergeFrame really free?

Yes, MergeFrame offers a free version with PNG + JPG 4000px export, 2 exports per day and 8 grid types. The Pro version ($7/month) unlocks unlimited exports, all import formats and customizable grids.

Are my images uploaded to a server?

No. MergeFrame processes your images exclusively in your browser via the Canvas API. No images are uploaded to a third-party server. MergeFrame cannot see, store or access your images.

What image formats are supported?

MergeFrame supports all common image formats: PNG, JPEG, WebP, SVG, GIF and BMP. Export is in high-resolution PNG at up to 4000px, on the free plan and on paid plans alike.

Can I use MergeFrame on mobile?

Yes, MergeFrame is responsive and works on all modern browsers (Chrome, Firefox, Safari, Edge) on desktop, tablet and mobile.

How-to Guide

Combine Screenshots Into One Image for Slack Messages

Slack threads with 5 separate screenshot attachments are chaos. One grid image replaces the clutter with a single, scannable visual that your team can understand in seconds: not minutes of scrolling.

Try MergeFrame (Free)

Slack is where work happens, but its image handling is frustrating: multiple attachments stack vertically, previews crop unpredictably on mobile, and threaded replies with images become impossible to follow. A merged screenshot grid solves all three problems.\n\nSlack-optimized grid formats: (1) Bug report: Strip of 3 showing expected → action → broken result, (2) Design review: 2×2 comparing desktop light, desktop dark, mobile light, mobile dark, (3) Daily standup: 2×2 showing yesterday's progress, today's plan, blockers, and metrics, (4) Async decision: 1×2 showing option A vs option B with a 'thumbs up for A, rocket for B' reaction prompt.\n\nExport at 1200px for sharp 2× Retina display. Use PNG for UI screenshots: Slack converts to JPEG for display but keeps your original for download. Add a brief description in your message: 'Grid: top-left = current, top-right = proposed, bottom = mobile.'

How to Do It: Step by Step

1
Capture all screenshots at same resolution
Same window size and zoom level for visual consistency in Slack's preview.
2
Open MergeFrame, select layout
Strip of 3 for bug reports, 2×2 for comparisons, 1×2 for async decisions.
3
Add thin cell borders
2px borders prevent adjacent screenshots from blending in Slack's compact preview.
4
Export at 1200px wide
2× Slack's display width for sharp Retina. Under Slack's file size limits.
5
Share in Slack with context
Drag into Slack. Add a one-liner: '3-cell grid: see description in thread.'

Ready to merge your images?

100% browser-based. No account. No upload. Free.

Open MergeFrame →

Frequently Asked Questions

Does Slack compress attached images?

Yes, Slack converts to JPEG for display. Export at 2× resolution (1200px+) and use PNG for best results.

Can I paste a grid directly into Slack from clipboard?

Yes. After exporting from MergeFrame, copy the image and paste directly into the Slack message field.

Will a grid image replace Slack's native gallery?

Slack shows one preview per attachment. A grid packs multiple screenshots into one attachment: cleaner threads.

Related Free Tools

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Free step-by-step guides from the same use case and from adjacent ones.

Optional: 10 social media grid templates you can import in one click, plus occasional MergeFrame tips. The tool stays 100% free and account-free: it is a bonus.

MergeFrame: Combine images into a grid. Free. No account. Browser-only.

Try MergeFrame Free →

Combine Images Into a Grid, Free Online Tool