# Transparency disappears after converting

> JPG has no alpha channel, so transparency cannot survive that conversion — it is a limitation of the format, not a bug in the converter.

Source: https://jpg-heic.com/fix/heic-transparency-lost | Section: Troubleshooting | Updated: 2026-08-31

## Why the background turned white

JPEG was designed in the early 1990s for photographs, and photographs have no transparent regions.
 The format has no mechanism for storing per-pixel opacity. When a converter writes JPG from an image
 with an alpha channel, it must composite the transparent areas onto something, and that something is
 conventionally white.

This is not recoverable afterwards. Once the transparency has been flattened, the file contains white
 pixels rather than absent ones, and no amount of editing restores the original alpha.

## Which formats keep transparency

| Format | Alpha channel | Notes |
|---|---|---|
| PNG | Yes, 8-bit | The safe choice; large files for photographs |
| WebP | Yes, lossy and lossless | Best size-to-compatibility ratio |
| AVIF | Yes | Smallest files; needs a recent browser |
| HEIC | Yes | Supported by the format, patchily by viewers |
| JPG | No | Flattens onto white, permanently |

For a transparent HEIC the answer is [PNG](https://jpg-heic.com/heic-to-png) if it must open anywhere, or
 [WebP](https://jpg-heic.com/heic-to-webp) if the destination is modern and file size matters.

## If PNG still came out with a white background

 - **The source may not have had transparency**
 Photographs from a phone camera are fully opaque. If the image looks like it should be
 transparent because it has a white area, that is a white area, not an empty one. Check in the
 [inspector](https://jpg-heic.com/heic-metadata-viewer), or open it in an editor over a coloured layer.

 - **The transparency was lost earlier in the chain**
 If the file passed through a messaging app, an email client or a social platform before reaching
 you, it has probably already been converted to JPG and back. The alpha was gone before you
 started.

 - **The editor flattened on export**
 Photoshop's Save for Web has a Transparency checkbox that must be ticked. Preview on macOS
 preserves alpha only in formats that support it — exporting to JPEG discards it silently.

 **When you actually want it flattened.** Print services, some upload forms and many document
 workflows require an opaque image, and a transparent PNG can print as an unexpected black or white
 block depending on the renderer. In those cases converting to JPG is the correct move — just do it
 knowingly, and keep the transparent original.

## Frequently asked questions

**Why does my transparent image have a white background after converting to JPG?**

JPEG has no alpha channel, so transparent regions must be composited onto a solid colour when the file is written. White is the conventional choice. The change is permanent.

**Which format should I use to keep transparency?**

PNG for maximum compatibility, WebP for a much smaller file with near-universal modern support, or AVIF for the smallest files if your destination is recent enough to read it.

**Can I restore transparency after converting to JPG?**

Not automatically. The transparent pixels were replaced with white ones. You can manually remove a solid background in an editor, but hair, glass and soft edges will not come back cleanly.

**Do iPhone photos have transparency?**

Camera photos do not — they are fully opaque. Transparency in HEIC appears in exported graphics, some screenshots and stickers or cut-outs created in the Photos app.