How to Join Images Together
Merging two photos sounds trivial until you try it with images that aren't the same size, which in practice is nearly always. Place a portrait next to a landscape without adjusting anything and you get a lopsided result with an obvious step along the seam. That's what the sizing modes here are for. The default, match along the join, scales each image so the edges that meet are exactly equal — same height when they sit side by side, same width when they're stacked — while leaving every aspect ratio untouched. Force identical cells goes further and makes every image the same dimensions, which is what you want for a strictly regular grid but will stretch anything that doesn't share the same proportions. Keep original sizes does no scaling at all and centres smaller images in their cell. Beyond that, the gap and padding sliders control the space between images and around the outside independently, and the background can be any colour or fully transparent in the PNG output. The order is yours to change at any point with the up and down buttons, and the preview rebuilds immediately after every adjustment. Everything is composited in your browser and nothing is uploaded.
Add your images
Drag and drop, paste, or click to browse — as many as you like.
Choose the layout
Row, column or grid, then set spacing and background.
Download
Save the combined image as PNG or JPG.
Joining vs Collage
Joining is structural
Images sit in a strict row, column or grid with even spacing. Every picture keeps its own rectangle and nothing overlaps, which makes it right for comparisons, panoramas and contact sheets.
A collage is freeform
Photos can overlap, rotate and sit at different scales for a scrapbook feel. It's more expressive but less predictable — if you need clean alignment, joining is the tool you want.
Common Use Cases
Before and after
Place two versions side by side so the difference is immediate.
Product variations
Show colourways or angles in one listing image.
Screenshot sequences
Stack steps vertically for a tutorial or bug report.
Photo grid for social
Combine several shots into one square post.
Simple panorama
Join overlapping shots edge to edge into a wide image.
Design comparisons
Put two mockups next to each other for client feedback.
Contact sheet
Lay out a whole shoot as a grid for review.
Email-friendly composite
One attachment instead of six separate files.
Tips & Best Practices
Leave size matching on
It's the difference between a clean seam and an obviously mismatched join. Only turn it off when exact pixels matter.
Use a small gap for comparisons
A few pixels of separation makes it clear these are two images rather than one continuous scene.
Use zero gap for panoramas
If the shots are meant to read as one wide image, any gap breaks the illusion.
Match the background to your page
White gaps on a dark website look like a mistake. Set the colour, or use transparent PNG.
Crop to the same ratio first
For a perfectly regular grid, crop each image to a shared aspect ratio before joining.
Compress afterwards
A combined image can be large. Run it through our compressor before publishing.
Troubleshooting
The images look stretched
Force identical cells is selected, which distorts anything that doesn't share an aspect ratio. Switch to match along the join.
There are gaps around some images
Keep original sizes centres smaller images in their cell. Use match or uniform to fill the space.
The result is too large to save
The combined dimensions exceeded the limit. Resize the source images down first, or join fewer at a time.
The background is white, not transparent
Transparency needs PNG output. JPEG has no alpha channel, so gaps are filled with white.
Frequently Asked Questions
How do I join images together for free?
Drop your images above, choose a row, column or grid layout, adjust the spacing and download — free, no signup and no watermark.
Are my images uploaded to a server?
No. Merging happens entirely in your browser, so your images never leave your device.
Can I join images of different sizes?
Yes. The default mode scales each one so the joined edges match, without distorting any aspect ratio.
How many images can I combine?
There's no fixed limit — only your device's memory and a maximum combined dimension.
Can I change the order?
Yes. Use the up and down buttons on each image, and the preview rebuilds instantly.
Can I make a grid?
Yes. Choose the grid layout and set how many columns you want.
Can I add space between images?
Yes. The gap slider controls spacing between images, and padding controls the border around the whole thing.
Can the background be transparent?
Yes, with PNG output. JPEG has no alpha channel, so gaps are filled with white.
Will it distort my images?
Not in match mode. Force identical cells will stretch images that don't share an aspect ratio — that's the trade-off for a perfectly regular grid.
Can I make a panorama?
You can join overlapping shots edge to edge with zero gap, though true stitching with blending is a different kind of tool.
Which format should I choose?
PNG for lossless quality and transparency, JPG for a smaller photographic file.
Is there a file size limit?
No. Nothing is uploaded, so the only constraint is your device's memory.
Can I remove an image after adding it?
Yes. Each entry has a remove button and the result rebuilds without it.
How do I split an image instead?
Use our split image tool, which divides a picture into a grid of separate files.
Does it add a watermark?
No. The output contains only your images.
Does it work offline?
Once the page has loaded it runs entirely in your browser, so it keeps working without a connection.
Does it work on phones?
Yes, in any modern browser on Windows, Mac, Android or iPhone with nothing to install.
Is this tool really free?
Completely free, forever — no account, no ads and no premium wall.
100% free · No signup · Processed in your browser · Never uploaded
Last updated: August 2026 · FlipMyFormat Join Images
Written and maintained by the FlipMyFormat team · Runs entirely in your browser