Can someone help with favicon

Why one favicon can appear differently across devices

The Reddit author reports that an icon loaded on a computer but not on iOS or One UI. That is a useful symptom report, not proof of its cause. A page can offer a browser icon while omitting a platform-specific touch icon or web app manifest entry. A platform may also crop an icon to fit its display shape. Check the declarations, fetched assets, and decoded pixels before deciding which part failed. In this local cross-device study, I kept the artwork constant and changed only the output route. That makes the three file measurements easier to compare, while keeping the limits clear: one synthetic source cannot diagnose the Reddit author’s devices.

For someone searching convert a png to an icon, the conversion is only the file-making step. It does not create HTML link elements, write a web app manifest, or guarantee that every client chooses the same image. Keep the file output and the page configuration in the same troubleshooting checklist.

Can someone help me with favicons like I can load it on computer but it just won't load on iOS or One UI

Local file measurements from one source image

I made a synthetic 512 × 512 transparent PNG, exported a multi-entry ICO, an 180 × 180 PNG touch-icon test file, and a full-bleed 512 × 512 PWA maskable test file. I reopened each saved output and decoded it with Pillow 12.3.0. The source art includes corner details so the mask experiment can count what falls outside its chosen circle.

The table reports actual bytes, dimensions, and pixel counts read from those files. Fully transparent means alpha equals zero; alpha below 255 includes both transparent and partially transparent pixels. The four ICO rows are entries inside one 10,871-byte file, not four separate downloads.

The mask test is a model, not a device result

Chrome's maskable icon guide describes a safe area using a circle whose diameter is 80% of the image. Applying that circle to this synthetic sample left 30,826 foreground pixels inside it and clipped 10,348 of the 41,174 foreground pixels. This is a count for the test artwork and the stated circle geometry. It does not predict the exact crop made by every Android launcher or prove how a particular phone displayed the icon.

The practical check is to keep important details within the intended safe zone, inspect the manifest entry, and then test on the destination devices you care about. The mask preview below is a crop calculation from the source PNG, not a screenshot from a phone.

What this experiment does and does not establish

It establishes that this generated ICO contains 16, 32, 48, and 256 pixel entries and that the saved touch-icon PNG contains transparent pixels. It also establishes that the test maskable PNG is fully opaque and that the defined circular mask excludes some corner artwork. The values matter as a file-level baseline: if a future run using the same script produces different entries or alpha counts, the output changed before it ever reached a phone. Compare hashes, byte counts, dimensions, and decoded alpha to locate that change. These values are not acceptance thresholds for all icon files.

It does not establish that those exact sizes are required for every browser, that an ICO is the only browser icon format, or that the sample reproduces a specific user's device failure. For an individual site, inspect its HTML, manifest, network requests, and downloaded files, then verify on the affected browser and device.

Decoded files from the local cross-device icon experiment

Generated locally on September 28, 2026 from one synthetic 512 × 512 transparent PNG. Files were reopened and decoded with Pillow 12.3.0. Fully transparent counts use alpha = 0; alpha-below-255 counts include partial transparency.

One synthetic source; Pillow 12.3.0; local decode only. The mask model used a circle diameter of 80% of the canvas: foreground before 41,174 pixels, clipped 10,348, retained 30,826. No physical phone or launcher screenshot is included.

• Download the decoded measurements CSV
• Download the reproduction script
• Download the synthetic source PNG
• Download the decoded ICO output
• Download the iOS touch-icon test PNG
• Download the PWA maskable test PNG

Check the three routes separately

1. 01
   Browser tab: inspect the page declaration

   Use a page icon declaration such as rel="icon" for the browser favicon route. A converter only creates an image file; it does not add the declaration to your page. Inspect the output file and the page's icon link separately.

2. 02
   iOS Home Screen: provide a touch icon

   Apple's archived Safari Web Content Guide documents PNG icons linked with rel="apple-touch-icon" for Web Clips. It shows a 180 × 180 example. Treat that as the size in the cited example, not a promise that every current destination requires only that size.

3. 03
   Installed PWA: check the manifest purpose

   A PWA manifest can identify an icon with purpose="maskable". Chrome's maskable guidance uses an 80%-diameter circle as a safe-zone guide. Artwork outside a destination's mask may be clipped, so leave important details inside a tested safe area.

4. 04
   Decode what you actually saved

   For every downloaded file, read its dimensions and decode its pixels. For ICO, enumerate each embedded image entry. For PNG, count fully transparent and partially transparent pixels separately. A filename or page preview does not prove that the export contains the intended layers or alpha.