FastImageToolsFastImageTools

Merge Images Online into One Clean Layout

Combine one set of images into a single static file for social posts, documents, and web use.

Free - no watermarksSingle merged image download

Drag & drop your images

or click below to browse your files

JPEGPNGWebPGIFBMPHEICHEIF
⌘VPaste from clipboard
•Drag from Finder or Photos

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

Popular ways to use this tool

Side-by-Side Photos

Put two or more photos side by side in one image. Align heights, set spacing, reorder files, and download the result.

Photo Collage Maker

Create a simple photo grid from multiple images. Choose rows, columns, gaps, fit behavior, background, and output format.

Before & After Maker

Place two photos side by side with Before and After labels. Adjust spacing, background, label visibility, and output format.

Screenshot Stitcher

Stack screenshots vertically into one long PNG. Reorder captures, align widths, remove spacing, and download one image.

Merge JPG Files

Combine two or more JPG images into one JPG. Reorder files, choose vertical or horizontal layout, adjust spacing, and download.

Merge PNG Files

Combine two or more PNG images into one PNG. Reorder files, choose a layout, adjust alignment and spacing, then download.

Eligible merges run locally in your browser. Jobs outside local limits may use the configured server fallback. Supports JPG, PNG, WebP, AVIF, GIF, and HEIC inputs. GIF animation is flattened, and each run creates one merged output.

Why Use FastImageTools for Image Merging

Local-first processing

Most merges run in your browser for speed and privacy.

Instant stitched output

Preview the selected layout, then encode one merged output.

Watermark-free core workflow

No watermark; file-count and processing limits depend on your account or execution tier.

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. Animated inputs are merged as static decoded frames.

  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 single static merged result and continue to a related tool.

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.
  • Subject to file-count, file-size, and output-dimension limits.
  • 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

Input set

4 source files

product-showcase-merged.png

-4 images -> 1 layoutPNG inputs → PNG output

Single merged output

One output file

Re-encoded output

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

Accepted as a decoded static frame; animation is not preserved.

HEIC

Common format from iPhone camera exports.

FAQ About Image Merging

Does merging images reduce quality?+
The output is newly encoded. Resizing, cover cropping, alignment, and lossy quality settings can change pixels or framing.
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 tier. Local output is capped at 16,384 pixels per side and 100 megapixels; larger jobs may route to remote processing when available.
Can I merge multiple image sets in batch?+
No. Each run merges one selected image set into one output file; it does not process multiple sets or create a ZIP.
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?+
Local jobs stay in your browser. A job routed to the configured remote fallback uploads its inputs for processing.

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 the merged layout into tiles or parts.

Optimize for Web

Apply complete web-ready optimization.

Batch Rename Images

Rename merged outputs consistently.

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