Is MergeFrame really free?

Yes, MergeFrame offers a free version with PNG + JPG 4000px export, 5 exports per day and 5 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 (up to 4000px in Pro version).

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 — 1×3 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\nSlack displays images at up to 600px wide in the message pane. Export 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
1×3 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.

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

Try MergeFrame Free →