Does Image Opacity upload my file or text to Tool-You servers?

No. Image Opacity runs in this browser tab. Files stay on the device. Limit note: Opacity 5–100%. PNG with alpha. First GIF frame only. Max 20 MB.

Should I use Adjust Image Brightness instead of Image Opacity?

Use Image Opacity when you need Make a PNG more transparent. Use Adjust Image Brightness when you need Brighten or darken a photo locally. They share a category (Images) but not the same job.

Image Opacity

Make a PNG more transparent.

Draws the picture with canvas globalAlpha 5–100%. Output is PNG with alpha. Unlike Brightness this does not lighten RGB. Unlike Saturate this does not change color. First GIF frame only.

What Image Opacity does

Draws the picture with canvas globalAlpha 5–100%. Output is PNG with alpha. Unlike Brightness this does not lighten RGB. Unlike Saturate this does not change color. First GIF frame only.

The interactive controls for Image Opacity load after this article so crawlers still read the instructions. Path /opacity-image is the canonical address. Work happens on this device; Tool-You does not take a copy of the file or pasted text for Image Opacity.

How to use Image Opacity

Stay on this Image Opacity page (/opacity-image). Do not switch to Adjust Image Brightness unless you actually want Brighten or darken a photo locally..
Add the file type Image Opacity accepts. Hint from the path: opacity image. Make a PNG more transparent.
Set only the options that match Image Opacity. Neighbor Saturate Image does something else (Raise or lower color saturation.). Tool note: Draws the picture with canvas globalAlpha 5–100%. Output is PNG with alpha. Unlike Brightness this does not lighten RGB. Unlike Saturate this does not change color. First GIF frame only.
Run Image Opacity in this tab. Browser memory still applies: Opacity 5–100%. PNG with alpha. First GIF frame only. Max 20 MB.
Download or copy the result from Image Opacity. If it is the wrong job, open Adjust Image Brightness instead.

When not to use Image Opacity

Skip Image Opacity when a neighbor tool matches better — start with Adjust Image Brightness or Saturate Image — or when the description already warns the job will fail. In the tool’s own words: Draws the picture with canvas globalAlpha 5–100%. Output is PNG with alpha. Unlike Brightness this does not lighten RGB. Unlike Saturate this does not change color. First GIF frame only.

Questions about Image Opacity

What does Image Opacity do that other Images pages on this site do not?: Draws the picture with canvas globalAlpha 5–100%. Output is PNG with alpha. Unlike Brightness this does not lighten RGB. Unlike Saturate this does not change color. First GIF frame only. Short version: Make a PNG more transparent.
Does Image Opacity upload my file or text to Tool-You servers?: No. Image Opacity runs in this browser tab. Files stay on the device. Limit note: Opacity 5–100%. PNG with alpha. First GIF frame only. Max 20 MB.
Should I use Adjust Image Brightness instead of Image Opacity?: Use Image Opacity when you need Make a PNG more transparent. Use Adjust Image Brightness when you need Brighten or darken a photo locally. They share a category (Images) but not the same job.
What are the limits of Image Opacity?: Opacity 5–100%. PNG with alpha. First GIF frame only. Max 20 MB. Also: Draws the picture with canvas globalAlpha 5–100%. Output is PNG with alpha. Unlike Brightness this does not lighten RGB. Unlike Saturate this does not change color. First GIF frame only.