How do I merge PNG files online?

Upload your two PNG images, choose vertical or horizontal merge direction, and download the combined PNG. Everything happens instantly in your browser.

Will my PNG images keep their transparency?

Yes, the merged PNG output preserves transparency from both source images. This is ideal for combining transparent PNGs like logos, icons, and overlays.

Can I merge more than two PNG images?

This tool merges two PNG files at a time. For more than two, merge the first pair, then use the result as the first image and merge with the next file.

Are my images uploaded to a server?

No. All merging runs entirely in your browser. Your images are never uploaded or transmitted to any server, ensuring complete privacy.

Is this PNG merger free?

Yes, completely free with no limits. No sign-ups, no watermarks, and no restrictions on how many merges you can do.

What is the difference between vertical and horizontal merge?

Vertical merge stacks images top-to-bottom. Horizontal merge places images side-by-side left-to-right. Choose based on your layout needs.

What happens if my images are different sizes?

When merging images of different dimensions, the smaller image is centered along the perpendicular axis. For the most balanced result, use images of similar sizes.

Can I use this on mobile devices?

Yes. The PNG merger works on iPhone, Android, iPad, and any device with a modern browser. No app installation needed.

What file size is supported?

Each image can be up to 15 MB. Images larger than 8192 pixels on the longest edge are automatically downsampled.

Is the output quality good?

Yes. The merged PNG output uses lossless PNG encoding, so there is no compression quality loss — perfect for graphics, logos, and images that need sharp output.

Add two images to merge them.

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Merge direction

Vertical

Horizontal

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Merge PNG images online

Combine two PNG files and keep transparency where possible. Layout, preview, PNG download.

What is a PNG Merger?

A PNG merger is an online tool that combines two PNG images into a single, lossless PNG file. Unlike JPG merging that compresses images with quality loss, PNG merging preserves the full transparency channel and produces perfectly sharp output. All processing happens using HTML5 Canvas in your browser — your images are never uploaded to any server. The tool supports vertical merging (images stacked top-to-bottom) and horizontal merging (side-by-side), automatically centering images of different sizes for a clean, balanced composition.

Merge PNG Features

Combine, join, and merge PNG images with these powerful features.

Preserves Transparency
Merged PNG output keeps alpha channel transparency from both images — ideal for logos, icons, and graphic design assets.
Vertical & Horizontal Merge
Combine PNGs vertically (top to bottom) or horizontally (side by side) with instant preview.
Lossless PNG Output
Download merged images as high-quality, lossless PNG files with no compression artifacts.
100% Client-Side
All processing happens locally. Your images never leave your browser for complete privacy.
Instant Preview
See the merged result immediately as soon as both images are uploaded. No waiting required.

How to Merge PNG Files Online

Three quick steps to combine your PNG images into one file.

1. Upload Your PNG Images
Drag and drop your first PNG into the top upload zone, and the second PNG into the bottom zone.
2. Choose Merge Direction
Select vertical to stack images or horizontal to place them side by side. Preview updates in real-time.
3. Download the Merged PNG
Click Download PNG to save your combined image as a single, lossless PNG file.

Tips for Merging PNG Images

Best practices for getting clean merged PNG results.

01
Match Image Sizes for Best Alignment
Using images with the same dimensions produces the cleanest merge. Different sizes are centered but may leave gaps.
02
Choose Direction Based on Content
Vertical works best for portrait-oriented images; horizontal for landscape or side-by-side comparisons.
03
Use for Transparent Assets
PNG merging is ideal for transparent logos, icons, and graphics that need the alpha channel preserved in the output.
04
Check the Preview First
Always review the live preview before downloading to confirm the alignment and layout look correct.
05
Resize Large Images First
If your input images are very large, resize them first to keep the merged PNG at a manageable file size.
06
Consider Canvas Color
Transparent areas between merged images show the checkerboard background in the preview. This is accurate — the actual PNG download will be transparent.

Image Merge Tools Compared — Which One Fits Your Workflow

How this free PNG merge tool stacks up against other popular options.

PineTools.com
Merge PNG images preserving transparency. Simple but no preview.
Imagy.app
Merge PNG with alignment options. More controls than basic users need.
OnlineConvert.com
PNG merger with server processing. Free with ads.
ILoveIMG.com
PNG merge and combine. Popular but account walls for some features.
Merge PNG
Merge two PNG images with transparency preserved. Vertical or horizontal. Real-time preview. All processing in browser.

Perfect for These Use Cases

Common reasons to merge PNG images together.

Combine Logo Variations
Merge horizontal and vertical logo versions, or combine logo mark with wordmark side by side.
Create Icon Sets
Combine multiple icon designs into a single sprite sheet or preview image for client presentations.
Merge UI Mockups
Combine multiple UI screenshots or design variations into one comparison image for sharing.
Social Media Graphics
Merge transparent PNG overlays with photos or create multi-element social media posts.
Combine Scanned Documents
Join multiple scanned document pages or receipts into a single, shareable PNG image.
Game Asset Sprite Sheets
Combine individual game sprites into a single spritesheet PNG for game development.

Why Use This PNG Merger

Advantages of this free, browser-based PNG merge tool.

No Software to Install
Works entirely in your browser. No Photoshop, no image editors, no downloads required.
Transparency Preserved
Unlike JPG mergers that produce opaque output, PNG merging keeps your alpha channels intact.
Lossless Quality
PNG uses lossless compression, ensuring no quality degradation when merging images.
Complete Privacy
Client-side processing means your images stay on your device — never uploaded to any server.
Works Everywhere
Compatible with all devices — Windows, Mac, Linux, iPhone, Android, and iPad.
100% Free, No Limits
No sign-ups, no watermarks, no usage caps. Merge as many PNG files as you need.

Technical Details

How the PNG merger works under the hood.

Canvas-Based Compositing: Uses HTML5 Canvas API to composite two images onto a single output canvas preserving alpha transparency.
Client-Side Only: All image processing and PNG encoding happens in your browser. No server communication whatsoever.
Supported Input Formats: PNG, JPG, JPEG, WebP, GIF. Files up to 15 MB each. Images auto-scale if exceeding 8192 pixels on the longest edge.
Output: Lossless PNG: Download as a single PNG with full alpha transparency support using canvas.toDataURL("image/png").
Maximum Dimensions: Each source image limited to 8192px on longest edge. Merged output constrained to 8192px maximum.
Auto-Center Alignment: Images of different sizes are automatically centered along the perpendicular axis for a balanced look.

Sources & References

Authoritative references on the PNG image format, the Canvas rendering technology this tool uses, and transparent image compositing.

“Portable Network Graphics is a raster-graphics file format that supports lossless compression, supporting a full RGBA color space with optional transparency.”
— Wikipedia — PNG
PNG image format specification: This tool is designed specifically for PNG merging — preserving the lossless compression and alpha transparency that make PNG the preferred format for graphics and logos. en.wikipedia.org/wiki/PNG
“The Canvas API provides a means for drawing graphics via JavaScript and the HTML canvas element.”
— MDN Web Docs — Canvas API
Canvas API (client-side compositing with alpha): This tool uses Canvas 2D to composite PNG images while preserving their alpha channels — ensuring transparent areas remain transparent in the merged output. developer.mozilla.org/en-US/docs/Web/API/Canvas_API
“PNG supports lossless data compression, making it useful for storing graphics that need to be edited repeatedly without losing quality.”
— W3C — PNG Specification (overview)
PNG image format (W3C specification): The W3C PNG specification documents the format's lossless compression and alpha channel support — the core features that make PNG the ideal output format for this tool. w3.org/TR/PNG/
“Lossless compression is a class of data compression algorithms that allows the original data to be perfectly reconstructed from the compressed data.”
— Wikipedia — Lossless compression
Lossless compression for graphics: PNG uses lossless compression, preserving every pixel exactly — this tool merges multiple PNG images into a single PNG output, maintaining full quality and transparency. en.wikipedia.org/wiki/Lossless_compression

Frequently Asked Questions

Quick answers about this tool—open a question to read more.