Calculator
What the Image to Favicon does
Image to Favicon: centre-crops the image to a square and renders every size a site needs: a multi-resolution favicon.ico (16, 32 and 48 px), PNGs from 16 to 512 px, the Apple touch icon and Android icons, plus the HTML link tags and a web manifest to paste in. Everything runs in your browser and the file is never uploaded.
The Image to Favicon works on a file you choose, without sending it anywhere. Everything runs on your own device, which means no waiting and no copy left on a server.
Typical users are people preparing images for the web. A smaller file that still looks right is usually only a few settings away.
No sign-up, no data collection, no processing queue, just code running locally.
The meaning of each field, the formula in use, and a worked example that starts from the default inputs are all further down.
What do the Image to Favicon fields mean?
The Image to Favicon uses 3 inputs. You can work from the defaults, or clear them and start fresh, both work.
| Field | What to enter | Default |
|---|---|---|
| Image file | stays on your device | none |
| Shape | choose from Square (as is), Rounded corners or Circle | Square (as is) |
| Background for transparent areas | choose from Keep transparent, White or Black | Keep transparent |
How does the Image to Favicon work?
Each output is derived from the inputs above in a single pass; there is no hidden state carried between runs, so the same inputs always give the same conversion.
The guard clauses run before the formula does, which is why mistakes surface next to the field.
What a typical run looks like
You provide: Image file, Shape and Background for transparent areas
What happens: the file is read into memory by your browser, processed locally, and offered back as a download. It is never uploaded.
You get back: a processed file plus a short status summary in the tool panel.
The tab does the processing, so speed tracks your hardware and very large files fail on memory rather than on a quota.
How to use it
- Choose your file under Image file, or drag it onto the drop area.
- Pick a value for Shape: the options are Square (as is), Rounded corners or Circle.
- Pick a value for Background for transparent areas: the options are Keep transparent, White or Black.
- Press Generate Favicons.
- You get Status, HTML for <head> and site.webmanifest back.
- Copy Link is the quickest way to send the exact scenario to someone else.
What this tool does not do
- EXIF metadata may be dropped during processing, which is usually desirable but is worth knowing.
- Re-encoding a lossy format such as JPEG always loses some detail, even at maximum quality.
- The method is fixed. There is no option to substitute your own formula.
- Performance scales with your own hardware, since no server does the work.
Frequently asked questions
Image file, Shape and Background for transparent areas. That is the whole form. Nothing starts empty, meaning you can explore the calculation before committing to real figures.
It is not uploaded. Everything happens on your device, so no copy of your file exists on any server.
Nothing at all. There is no registration, no paywall and no per-use quota.
Reliable for the case described. Where more than one convention exists, the method section says which one is used.