HEIC and PNG are both capable image formats, but they are usually chosen for different jobs. HEIC is closely associated with efficient camera photographs. PNG is a lossless format that is especially useful for screenshots, interface graphics, diagrams and images where transparency matters.
Photographs and screenshots behave differently
A camera photo contains many subtle color and texture changes. Efficient photographic compression is useful because it can reduce the amount of data substantially. A screenshot or logo often contains large flat areas, sharp edges and text; preserving those details exactly can be more important than minimizing the file size.
Why PNG can be much larger
PNG is lossless: decoding it reproduces the stored image data without the same type of lossy quality reduction used by JPG. That makes PNG valuable for graphics, but a lossless representation of a large photograph can be much bigger than a compressed photographic format. Converting a HEIC photo to PNG therefore should not be viewed as a guaranteed file-size reduction.
Transparency is a major reason to choose PNG
If a workflow needs transparent pixels, PNG is often a practical choice. Examples include logos placed over changing backgrounds, UI assets and certain illustrations. A typical phone photograph does not need transparency, so PNG may add file weight without solving a real problem.
Quick comparison
| Use case | HEIC | PNG |
|---|---|---|
| Camera photo storage | Strong fit | Often unnecessarily large |
| Screenshot with text | Not the usual choice | Strong fit |
| Transparency | Workflow-dependent | Strong fit |
| Maximum compatibility | Less predictable | Widely supported |
When HEIC to PNG makes sense
Conversion can be useful when a destination specifically requires PNG, when you need a broadly supported lossless file for editing, or when the image is going into a workflow that benefits from PNG characteristics. Before converting a large photo, check the resulting file size because PNG can be substantially larger.
When PNG is the wrong choice
If the only goal is to make a camera photo smaller, PNG is usually not the first format to try. Consider JPG or WebP instead, depending on compatibility and the destination. Format choice should follow the purpose of the image.