FastImageToolsFastImageTools

Merge Images Online into One Clean Layout

Combine multiple images into one file for social posts, documents, and web use.

Free - no watermarksBatch + ZIP download

Drag & drop your images

or click below to browse your files

JPEGPNGWebPGIFBMP
⌘VPaste from clipboard
•Drag from Finder or Photos

Free users: up to 15 images at once • Premium: unlimited batch processing

Images are processed locally in your browser whenever possible. If local processing isn't supported or fails, we automatically complete the job on our servers - no action required. Supports JPG, PNG, WebP, AVIF, GIF, and HEIC. Merge single sets or batches, then download final outputs instantly.

Why Use FastImageTools for Image Merging

Local-first processing

Most merges run in your browser for speed and privacy.

Instant stitched output

See layout preview and generate final images in seconds.

Completely free

No signup, no watermark, no hidden restrictions.

Smart layout modes

Vertical, horizontal, grid, and before/after merge presets.

How to Merge Images

  1. 1

    Upload JPG, PNG, WebP, AVIF, GIF, or HEIC files

    Add two or more images from your device to start the merge workflow.

  2. 2

    Choose merge mode and output settings

    Select layout direction, spacing, order, labels, and output format.

  3. 3

    Download the merged image

    Export the final stitched result immediately and continue to related tools.

Browser-Based Merging vs Cloud Tools

FastImageTools (local-first)

  • Files stay on your device whenever local processing is available.
  • Merging starts without mandatory upload delay.
  • Best for standard creative and web image sets.
  • Core merging workflow is free and watermark-free.
  • Can work with unstable internet when local runtime is available.

Typical cloud tools

  • —Usually requires uploading files to remote servers first.
  • —Processing begins only after upload is complete.
  • —Often limited by plan quotas or queue time.
  • —Advanced layout options are frequently paid.
  • —Needs active internet for full processing flow.

Example Merge Result

Source images total

9.1 MB (4 files)

product-showcase-merged.png

-4 images -> 1 layoutPNG -> PNG

Merged output

8.7 MB

Visually identical

Supported Image Formats

JPG

Great for photos and marketing visuals.

PNG

Best for clean graphics and transparency.

WebP

Efficient modern format for web delivery.

AVIF

High compression with modern-browser focus.

GIF

Useful for simple animated and legacy assets.

HEIC

Common format from iPhone camera exports.

FAQ About Image Merging

Does merging images reduce quality?+
Merging itself does not reduce quality. Quality changes only if you choose a lossy output format or lower export quality.
Is it safe to merge images here?+
Yes. Processing is local-first. If local execution is unavailable, secure server fallback completes the merge automatically.
What is the maximum file size I can merge?+
Limits depend on your browser and available memory. Very large jobs may use server fallback to finish reliably.
Can I merge multiple image sets in batch?+
Yes. Batch workflows are supported, and results can be downloaded quickly after processing.
What is lossy vs lossless output for merging?+
Lossless preserves image data with larger files. Lossy reduces size with possible visual tradeoffs.
Which output format is best for web?+
WebP is a strong default for web. JPG gives broad compatibility, and PNG is ideal when transparency is needed.
How is local-first merging different from cloud tools?+
Local-first begins directly in your browser. Cloud tools usually require full upload before any merge starts.
Are my images uploaded to your servers?+
Only when local processing is not supported or fails. In that case, server fallback runs automatically to complete the task.

Related Image Tools

After merging, continue your workflow with these tools.

Resize Image

Fit merged output to exact dimensions.

Compress Image

Reduce merged file size for sharing.

Convert to WebP

Create a lighter format for web pages.

Image Splitter

Split merged layouts back into tiles.

Optimize for Web

Apply complete web-ready optimization.

Batch Rename Images

Rename merged outputs consistently.

We value your privacy

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