When the form says "maximum 2 MB, one file"
Upload limits are the reason most people go looking for a tool like this. A portal asks for a single document under 2 MB, you have four photos from your phone at 4 MB each, and resizing them by hand is guesswork. Combinor takes the whole set, lays it out as one image and then searches for the encoding that lands just under your limit — so you get the largest, sharpest file that the form will actually accept, rather than an over-compressed one.
Why not just resize the images yourself
Because file size does not follow dimensions in any predictable way: halving the width does not halve the bytes, and the relationship depends on the content of the photo. Guessing means either overshooting the limit and retrying, or shrinking far too much and losing detail you did not have to lose. The tool tries the quality ladder first, only reduces the dimensions if that is not enough, and stops as close under your target as it can get. If the target turns out to be unreachable without destroying the image, it says so instead of silently returning something unusable.
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 make an image smaller than 2 MB?
Add your images above and press Combine & Compress. The limit is already set to 2 MB; the result panel confirms the final size, and you can lower or raise the limit at any time.
Can I target a limit other than 2 MB?
Yes. The max file size field accepts anything from 0.1 to 100 MB, so 1 MB, 5 MB or 500 KB all work.
Does hitting the size limit ruin the image?
Not usually. Quality is reduced step by step from 92 down to 60 and stops as soon as the file fits — many images reach 2 MB with no visible change. Only when that is not enough are the dimensions reduced.
What if the size limit cannot be reached?
The result is still returned, with a warning that the target could not be met without destroying quality. In practice this only happens with extreme targets, such as hundreds of megapixels under a few hundred kilobytes.
Which format should I choose for an upload form?
JPEG, which is preselected here. Many forms accept only JPEG or PNG. Choose WebP only when you know the destination accepts it — it gives a smaller file, so more detail survives under the same limit.
Does compressing remove the EXIF data from my photos?
Yes. The output is re-encoded from raw pixels, so metadata from the source files — including GPS coordinates recorded by a phone — is not carried into the combined image.