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Merge JPG images online

Combine two JPG files into one JPG. Horizontal or vertical layout with optional border.

What is a JPG Merger?

A JPG merger is an online tool that combines two or more JPG images into a single image file. Unlike desktop software that requires installation and file uploads, this tool runs entirely in your browser using HTML5 Canvas technology. It reads your JPG images locally, stitches them together vertically or horizontally, and outputs a single merged JPG file — all without sending your images to any server. The result is a combined image that preserves the original quality while giving you a single, convenient file to download, share, or embed.

Merge JPG Features

Combine, join, and stitch JPG images together with these powerful yet simple features.

  • Vertical & Horizontal Merge

    Combine JPGs vertically (top to bottom) or horizontally (side by side) with a single click.

  • JPG Output Format

    Download merged images as high-quality JPG files — ideal for photos, documents, and web publishing.

  • 100% Client-Side

    All merging runs locally in your browser. Your images are never uploaded to any external server.

  • Auto Image Adjustment

    Images are automatically scaled to fit within maximum dimensions, ensuring the merged output is not oversized.

  • Instant Preview

    See the merged result in real-time as soon as both images are uploaded. No waiting for server processing.

How to Merge JPG Files Online

Three simple steps to combine your JPG images into one file.

  1. 1. Upload Your JPG Images

    Drag and drop your first JPG into the top upload area, and your second JPG into the bottom upload area.

  2. 2. Choose Merge Direction

    Select vertical to stack images top-to-bottom, or horizontal to place them side-by-side. The preview updates instantly.

  3. 3. Download the Merged JPG

    Click the Download JPG button to save your combined image. The result is a single, high-quality JPG file.

Tips for Merging JPG Images

Best practices for getting the best merged results.
  • 01

    Use Similar Image Sizes

    For the cleanest merged result, use images with similar dimensions. If they differ, the smaller image is centered against the larger one.

  • 02

    Match Orientation to Content

    Use vertical merge for portrait photos or stacks; use horizontal merge for landscape photos, side-by-side comparisons, or banners.

  • 03

    Optimize Before Merging

    If your source images are very large, consider resizing them first. This keeps the merged output at a manageable file size.

  • 04

    Preview Before Downloading

    Always check the live preview before downloading to make sure the merge direction and alignment look correct.

  • 05

    Use for Web-Optimized Output

    The JPG output format provides good compression for photos, making merged files ideal for websites, emails, and social media.

  • 06

    Combine with Other Tools

    After merging, use other image tools to crop, resize, or add text to your combined image for the perfect final result.

Image Merge Tools Compared — Which One Fits Your Workflow

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

  1. PineTools.com

    Merge JPG images with direction choice. Simple but no real-time preview.

  2. Imagy.app

    Merge images supporting JPG format. More control options but complex interface.

  3. OnlineConvert.com

    JPG merger with server uploads. Free tier has file size limits.

  4. ILoveIMG.com

    Popular image merger with batch support. Clean interface but requires account for full features.

  5. Merge JPG

    Merge two JPG images vertically or horizontally. Real-time preview. 100% client-side processing.

Perfect for These Use Cases

Common scenarios where merging JPG files is useful.

  • Combine Before & After Photos

    Merge before and after images side by side for comparisons, transformations, or renovation showcases.

  • Create Photo Collages

    Stitch multiple photos together into a single image for social media posts, galleries, or presentations.

  • Document Scanning

    Combine multiple scanned document pages into one image — perfect for forms, receipts, or multi-page files.

  • Product Listings

    Merge multiple product photos into a single listing image for e-commerce platforms and marketplaces.

  • Social Media Banners

    Combine multiple images horizontally to create banner-style images for Facebook, Twitter, or LinkedIn profiles.

  • Design Mockups

    Quickly merge UI screenshots, design variations, or layout options for client presentations and feedback.

Why Use This JPG Merger

Advantages of merging JPG files with this online tool.

  • No Software Required

    Completely browser-based — no Photoshop, no GIMP, no app downloads. Just open and merge.

  • Privacy Protected

    Client-side processing means your photos and images never leave your computer. Total privacy guaranteed.

  • Works Everywhere

    Compatible with Windows, Mac, Linux, iPhone, Android, and iPad. Any device with a modern browser.

  • Completely Free

    No limits, no watermarks, no premium versions. Merge unlimited JPG files at zero cost.

  • Fast & Efficient

    Instant preview and download. No waiting for uploads or server-side processing queues.

  • High Quality Output

    Merged JPG files maintain excellent image quality with high-quality canvas-to-JPG conversion.

Technical Details

How the JPG merger works under the hood.
Canvas-Based Merging
Uses HTML5 Canvas API to composite two images onto a single canvas with precise positioning and alignment.
Client-Side Processing
All image reading, merging, and JPG encoding happens locally in your browser. Zero server communication.
Supported Input Formats
JPG, JPEG, PNG, WebP, GIF. Files up to 15 MB each. Images are automatically downsampled if they exceed the maximum dimensions.
Output Format
Merged output as a single JPG file with 92% quality encoding for an optimal balance of quality and file size.
Maximum Dimensions
Each input image is limited to 8192 pixels on its longest edge. Merged output is constrained to 8192 pixels maximum.
Alignment
When images differ in size, the smaller image is centered along the perpendicular axis for a balanced composition.

Sources & References

Authoritative references on the JPEG compression standard, the Canvas rendering technology this tool uses, and the PNG output format.
  • “JPEG is a commonly used method of lossy compression for digital images, particularly for those images produced by digital photography.”
    — Wikipedia — JPEG

    JPEG image compression standard: This tool merges JPG images and outputs a JPG file — working within the JPEG format that is the most widely used lossy compression standard for photographic images on the web. en.wikipedia.org/wiki/JPEG

  • “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 image compositing): This tool uses Canvas 2D to composite JPG images onto a shared canvas and exports via toDataURL with JPG encoding — all running locally in your browser. 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: While this tool outputs JPG, the PNG specification documents lossless compression principles that contrast with JPEG's lossy approach — helping users understand format trade-offs. w3.org/TR/PNG/

  • “Lossy compression is a class of data encoding methods that uses inexact approximations and partial data discarding to represent the content.”
    — Wikipedia — Lossy compression

    Lossy compression for photographs: JPEG uses lossy compression to achieve smaller file sizes by discarding imperceptible image detail — this tool merges multiple JPG images into a single JPG while optimizing file size. en.wikipedia.org/wiki/Lossy_compression

Frequently Asked Questions

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