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Instructions for Use

First, click "Open Image File" in the main menu to load an image file.
Open Image File
You can also open a file by dropping the image directly onto the canvas.
Drop Image File

Make a Color Transparent

Once your image has been opened, use the mouse to left-click the portion of the image that you want to make transparent.
When you do so, all parts of the image that are the color that you clicked will become transparent.
Make a Color Transparent


Target color
You can set this tool to make either the color that you clicked transparent or every color other than the one you clicked.
You can set the opacity between 0 and 100.
The "0" setting is for complete transparency; as this value increases, the opacity increases, so that "100" is completely opaque.
By adjusting this value, you can create a semitransparent image.
Set the opacity of all colors
Adjust the image so that it is entirely semitransparent.
Set the opacity of all colors
Adjust opacity by color brightness
Set opacity based on the brightness of each pixel in the image.
The darker a color is, the more transparent it becomes, while the lighter it is, the more opaque it will be.
Before Image Arrow After Image
Copy opacity from another image
Copy opacity from another image
Click the "Add Image file" button to load an image file to copy opacity from.
load image
Once you adjust the position of the image you have loaded, click "Paste" in the main menu.
paste image
Doing this will copy the opacity as-is into the image you are editing from the image you have pasted.
copy image

Saving Images

When you finish editing, save your image.
Please save the image that is displayed on the canvas directly from the menu of your web browser.
save image as
You can also save your work using "Save Image" in the main menu, but this may not function in some browsers.
save image

Handling of images

This app performs the image processing on the user's device, and does not transmit any imported images externally.
Accordingly, there is no worry of the content of the image being recorded on servers, nor of any leakage to outside parties.
Free Online Image Editor

Make the background of an image or photo transparent / translucent

This is a free image editor that runs in your web browser.
It allows you to edit images easily on a PC or smartphone without installing anything.
Using this tool, you can easily make a color you select in an image transparent or semitransparent.