Converting a JPG image to PNG changes the image's file format. It can be useful when a workflow specifically requires PNG, when you want a lossless raster representation of the current pixels, or when the destination handles PNG better. The important limitation is that converting a JPG to PNG cannot restore detail that was already lost in the original JPEG.
JPG and PNG are built for different jobs
JPEG commonly uses lossy compression and is often efficient for photographs. PNG uses lossless compression and is useful for screenshots, graphics, text-heavy images and transparency. The file produced by a JPG-to-PNG conversion may therefore be larger than the original JPG.
Convert JPG to PNG with Tervilo
- Open the Tervilo JPG to PNG Converter.
- Select the JPG or JPEG image.
- Start the conversion.
- Check the output dimensions and visual appearance.
- Compare the file size with the original.
- Use the PNG only when its format benefits your destination.
What conversion does not do
If the original JPG already contains compression artifacts, converting it to PNG does not reverse them. The PNG preserves the pixels it receives; it does not recreate the scene as it existed before JPEG compression.
When PNG is a good choice
PNG is useful for images with transparency, crisp interface screenshots, diagrams, logos and graphics where lossless representation of the current pixels matters. It is not automatically better for photographs simply because it is lossless; the resulting file can become much larger.
Does PNG improve image quality?
It can prevent additional JPEG-style losses during future PNG edits, but it cannot improve the existing source detail. A blurry or heavily compressed JPG stays blurry after conversion.
What happens to transparency?
A standard JPG does not contain transparency, so converting it to PNG does not create transparent areas from nowhere. If the source looks like it has a background that you want removed, that is a separate background-removal/editing task.
Example
A 1.2 MB JPG screenshot with small text may be converted to PNG for a workflow that requires a lossless graphic. The PNG could be larger than 1.2 MB. The choice is still reasonable if the destination prefers PNG or if repeated editing without further JPEG loss matters.
Check the result
Open the PNG and inspect text, edges, colors and dimensions. Compare it with the original JPG at the same display size. Also check whether the larger file size creates a problem for the site or upload service.
When should you keep the JPG?
Keep the JPG when the destination accepts JPEG, the image is already at a suitable size, and you do not need PNG-specific features. Converting formats just to make a file “higher quality” is not a useful reason by itself.
Think about the destination first
A website, design application, messaging service and document system can have different format requirements. Check the destination before converting a whole folder of images. A single compatible JPG may be more useful than a larger PNG when upload limits matter.
Common mistakes
- Expecting JPG-to-PNG to restore lost detail.
- Assuming PNG will always be smaller.
- Expecting conversion to remove a JPG background.
- Replacing the original JPG before checking the PNG.
Quick checklist
- □ I have a clear reason to use PNG.
- □ I kept the original JPG.
- □ I checked the converted image visually.
- □ I checked the new file size.
- □ I verified that the destination accepts PNG.
Quick answer
Convert JPG to PNG when the destination needs PNG or when a lossless raster format is useful. Do not expect the conversion to restore JPEG detail, and check the resulting file size because PNG can be substantially larger for photographs.