Does Alpha Hex8 upload my file or text to Tool-You servers?

No. Alpha Hex8 runs in this browser tab. Files stay on the device. Limit note: Hex and alpha 0–1.

Should I use CSS Opacity instead of Alpha Hex8?

Use Alpha Hex8 when you need Append alpha to a hex color. Use CSS Opacity when you need Build an opacity: 0–1 rule. They share a category (Design) but not the same job.

Alpha Hex8

Append alpha to a hex color.

Builds #rrggbbaa from hex + alpha 0–1. Unlike CSS Opacity this returns hex8. Bad hex/alpha fails.

What Alpha Hex8 does

Builds #rrggbbaa from hex + alpha 0–1. Unlike CSS Opacity this returns hex8. Bad hex/alpha fails.

Alpha Hex8 sits in the Design group on purpose. It is not CSS Opacity (Build an opacity: 0–1 rule.) and not Color Picker (Hex, RGB, and HSL from a color.). Choose this page when you need Append alpha to a hex color. If you stretch Alpha Hex8 into a neighbor’s job, the result will look wrong even though the site chrome looks the same.

How to use Alpha Hex8

Use Alpha Hex8 for this design job (design · alpha hex8). CSS Opacity is adjacent (Build an opacity: 0–1 rule.) but not the same.
Add the file type Alpha Hex8 accepts. Hint from the path: design · alpha hex8. Append alpha to a hex color.
Set only the options that match Alpha Hex8. Neighbor Color Picker does something else (Hex, RGB, and HSL from a color.). Tool note: Builds #rrggbbaa from hex + alpha 0–1. Unlike CSS Opacity this returns hex8. Bad hex/alpha fails.
Run Alpha Hex8 in this tab. Browser memory still applies: Hex and alpha 0–1.
Download or copy the result from Alpha Hex8. If it is the wrong job, open CSS Opacity instead.

When not to use Alpha Hex8

Skip Alpha Hex8 when a neighbor tool matches better — start with CSS Opacity or Color Picker — or when the description already warns the job will fail. In the tool’s own words: Builds #rrggbbaa from hex + alpha 0–1. Unlike CSS Opacity this returns hex8. Bad hex/alpha fails.

Questions about Alpha Hex8

What does Alpha Hex8 do that other Design pages on this site do not?: Builds #rrggbbaa from hex + alpha 0–1. Unlike CSS Opacity this returns hex8. Bad hex/alpha fails. Short version: Append alpha to a hex color.
Does Alpha Hex8 upload my file or text to Tool-You servers?: No. Alpha Hex8 runs in this browser tab. Files stay on the device. Limit note: Hex and alpha 0–1.
Should I use CSS Opacity instead of Alpha Hex8?: Use Alpha Hex8 when you need Append alpha to a hex color. Use CSS Opacity when you need Build an opacity: 0–1 rule. They share a category (Design) but not the same job.
What are the limits of Alpha Hex8?: Hex and alpha 0–1. Also: Builds #rrggbbaa from hex + alpha 0–1. Unlike CSS Opacity this returns hex8. Bad hex/alpha fails.