Merge images and hit a file size limit in one step
Most tools do one job or the other: they join pictures together, or they shrink a file. Combinor does both in a single pass — it lays your images out on one canvas, then encodes that canvas as large as it can while staying under the size limit you set. That is the usual reason for merging images in the first place: an upload form that refuses anything over 2 MB, an email attachment limit, a classified ad that accepts a single photo.
What people use it for
Getting under an upload limit
Job applications, insurance claims and government portals often cap uploads at 2 MB and accept one file. Combining several photos and compressing to the cap solves both constraints at once.
Before-and-after and comparison shots
Two images side by side in a single file are far easier to send and to read than two separate attachments.
Screenshots for a report or a bug ticket
Stack a sequence of screenshots vertically to keep them in order and in context, instead of attaching six separate files.
Photo grids for listings
Marketplace and rental listings that allow a single photo still let you show a whole room — or a whole item — with a grid collage.
How it works
Add your images
Drop them anywhere on the page or pick them from your device. JPEG, PNG, WebP, GIF, TIFF and AVIF are all accepted, and photos shot on a phone keep the right orientation because EXIF rotation is applied.
Choose a layout and an order
Horizontal puts the images side by side at a common height, vertical stacks them at a common width, and grid arranges them in even columns. Every layout scales proportionally, so nothing is ever stretched or distorted. Drag the thumbnails, or use the arrow buttons, to set the order.
Set your size limit and combine
Enter the maximum file size you need — 2 MB by default. Combinor first lowers the encoding quality step by step, and only if that is not enough does it reduce the dimensions, searching for the largest image that still fits under your limit.
Limits and supported formats
| Input formats | JPEG, PNG, WebP, GIF, TIFF, AVIF |
|---|---|
| Output formats | JPEG, WebP |
| Images per combine | Up to 200 |
| Maximum per file | 80 MB |
| Maximum per request | 256 MB |
| Maximum per image | 100 megapixels |
| Default size limit | 2 MB (adjustable from 0.1 to 100 MB) |
| Spacing between images | 0 to 200 pixels |
| Layouts | Horizontal, vertical, grid |
| Account required | No |
| Images stored on the server | No — processed in memory only |
| Price | Free |
How the compression works
Reaching a target file size is a search problem, because the size of an encoded image cannot be predicted from its dimensions alone. Combinor walks the encoding quality down from 92 to 60 and stops as soon as the result fits your limit. If even quality 60 is too heavy, it keeps quality at a readable 75 and shrinks the dimensions instead, narrowing in on the scale factor by bisection so the final image is as large as it can be while still landing under the limit. The result tells you the final size, the dimensions and the quality that were used.
What happens to your images
Your images are sent to the server, combined in memory and sent straight back. Nothing is written to disk, nothing is stored, and there is no account to create. The output is re-encoded from raw pixels, which means the metadata of the source files — including any GPS coordinates recorded by a phone — does not survive into the combined image.
Frequently asked questions
How do I combine several images into one file?
Add your images to the tool above, pick a horizontal, vertical or grid layout, then press Combine & Compress. You get a single JPEG or WebP file back, ready to download.
Will combining images reduce their quality?
Only as much as your size limit requires. If the combined image already fits under the limit at high quality, nothing is degraded. The tighter the limit relative to the content, the more quality or resolution has to be given up — the result panel always shows which quality was used.
Are my images stored on the server?
No. Images are processed in memory and returned immediately. They are never written to disk and never stored, and no account is required.
Which image formats can I upload?
JPEG, PNG, WebP, GIF, TIFF and AVIF. Files are validated by their actual content rather than their extension, and the combined result is produced as JPEG or WebP.
Should I choose JPEG or WebP?
Choose JPEG when the file has to be accepted anywhere, including older software and upload forms that only take JPEG. Choose WebP when you want the smallest file at equal quality, which usually means more detail is retained under the same size limit.
Are the images distorted to fit together?
Never. Every layout resizes images proportionally to a shared width or height, so aspect ratios are always preserved. Empty space in a grid is filled with the background color you choose.
Is Combinor free?
Yes. The tool is free to use, with no signup, no account and no payment details to hand over. There is no trial period and no feature held back behind a paywall.