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Image Merger

Merge images locally in your browser into vertical stacks, side-by-side comparisons, or grid collages with spacing, background color, transparent background, HEIC/HEIF input, PNG/JPEG/WebP output, and max export size controls.

Drag & drop images here or click to select

Supports PNG / JPEG / WebP / AVIF / HEIC / HEIF input; PNG / JPEG / WebP output

File count

0 / 10

Total size

0 bytes / 150 MB

Single-file limit

25 MB
Image Merger

Quick Start

1
Import images: Select PNG, JPEG, WebP, AVIF, HEIC, or HEIF files
2
Choose layout: Pick vertical stack, horizontal row, or grid collage
3
Adjust options: Reorder images, set spacing, background or transparency, alignment, auto-resize, and max size
4
Merge preview: Generate one PNG, JPEG, or WebP result with export limits applied
5
Download result: Save the merged PNG, JPEG, or WebP image

Common Scenarios

Simple vertical stack

Place screenshots or steps top to bottom when you do not need automatic stitch analysis

Comparison image

Side-by-side horizontal display for before/after comparison

Grid collage

Choose 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 12, or 16 cells, swap images, and drag dividers

Merge Options

Mode: Vertical (top-bottom)/Horizontal (left-right)/Grid (fixed cells)
Spacing: Pixel gap between images
Background color: Fill empty areas, or keep a transparent background when exporting PNG/WebP
Alignment: Alignment when sizes differ (left/center/right)
Auto-resize: Vertical matches width, Horizontal matches height, and Grid contains images proportionally inside cells; it is not smart crop or template fitting.
Grid layout: Choose 1–16 cells or split templates, drag dividers to adjust sizes, and note that extra images beyond the selected cells are not exported
Output format: PNG/JPEG/WebP; quality only applies to JPEG/WebP, HEIC/HEIF is input only, and JPEG fills the background instead of preserving transparency.
Max output size: With the ratio locked, width and height limits scale proportionally; when unlocked, both limits can scale the final export independently.

Usage Advice

Enable auto-resize when image sizes vary, but check the preview because it keeps proportions instead of detecting subjects
Vertical/horizontal mode: use move up/down to reorder; Grid mode: hold and drag images to swap
After selecting image, use Q/E to rotate, or drag rotation handle (Shift for 15° snap)
Space+left-click drag or right-click drag to pan canvas
Shortcuts: Ctrl/⌘+Z undo, Ctrl/⌘+Y redo, Del delete, ↑↓←→ nudge (Shift faster), Q/E rotate (Shift 5°), +/- zoom view, 0/F fit canvas, R relayout
For very large images or too many files, set a max export size or resize first

Limitations & Compatibility

Recommend latest Chrome/Edge/Firefox or Safari 16+
This is not a long screenshot stitcher; use the long screenshot tool for automatic continuous screenshot matching.
Handles PNG, JPEG, WebP, AVIF, and HEIC/HEIF image input. PDF, video, animated GIF, PSD, DICOM, RAW, and SVG are outside this merger.
No AI editor, background remover, panorama alignment, or smart crop is applied.
No metadata preservation guarantee; exported images are newly rendered from the browser canvas.

Privacy & Security

Image merging runs in your browser. Source images stay in page memory while this tool is open. Layout, spacing, background, transparency, alignment, grid, output format, quality, max size, and aspect-lock settings may stay in browser storage; if WebDAV sync is enabled, those settings may sync according to your settings. Image files are not synced by default; they only enter WebDAV attachment sync when you explicitly enable attachment sync. The merged PNG/JPEG/WebP file is generated for download and is not stored as a separate result. On shared devices, clear images, results, saved settings, and site data when needed.

FAQ

6

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All tool processing happens locally in your browser.