How to convert PNG to JPG and choose what fills the transparent parts

Open Convert image, drop in the PNG files, keep JPG under Convert to, choose a colour for Transparent areas if the PNG has any, and download. A PNG photo usually becomes several times smaller as a JPG with no visible change. The PNG to JPG page opens the same tool ready for this job.

Steps

1. Open Convert image and drop your PNG files on the box. You can add a batch.
2. Under Convert to, keep JPG.
3. Under Quality, tap a preset: 60%, 80%, 92% (the starting value) or 100%, or drag the slider between 10% and 100%.
4. Under Transparent areas, pick White or Black, or any other colour, for the see-through parts.
5. Tap a thumbnail to compare that image with its JPG, then download each file or all of them as one zip.

What changes when a PNG becomes a JPG

PNG stores every pixel exactly. That is ideal for screenshots, diagrams and logos, but a photo saved as PNG carries a huge amount of detail that a JPG can drop without anyone noticing. Converting re-encodes the picture as a JPG at the quality you choose, so the file gets much smaller.

Two things do not survive the trip:

• Transparency. JPG cannot store see-through pixels, so the tool paints them with the colour under Transparent areas. White suits documents and most web pages; black suits dark designs. If the picture has no transparent parts, this setting changes nothing.
• Hidden metadata. Most EXIF details, such as GPS location, are dropped when the image is re-saved.

Which quality to choose

The hint under the slider says it plainly: lower makes a smaller file, and 90% and above usually looks the same as the original.

When to keep the PNG

JPG works by smoothing small areas of colour, which shows up as faint smudges around sharp edges, such as letters in a screenshot or the lines of a chart. If your PNG is mostly flat colour and text, the JPG may come out larger and look worse. Keep those as PNG, or choose WebP under Convert to, which keeps transparency and is usually smaller.

Need an exact file size?

Convert sets the quality, not the size in KB. If a form asks for "JPG under 100 KB", convert to JPG first, then open the JPG in Compress image and tap 100 KB. Or skip a step: Compress image takes PNG directly and can save as JPG while it hits the target. Our guide to reducing a photo to 100 KB covers that route.

Troubleshooting

• The logo got a white box behind it. That is JPG filling the transparency. Convert to PNG or WebP instead.
• The JPG is bigger than the PNG. The image is probably a flat graphic. Keep the PNG.
• Colours look slightly different. Re-encoding can shift very saturated colours a little. Try 100%, or keep PNG for brand graphics.

Questions

Is JPG or JPEG the right choice?

They are the same format. Files from this tool end in .jpg, which every site that wants "JPEG" accepts.

Can I convert many PNG files at once?

Yes. Drop in a batch; every file uses the same format and quality, and you can download them together as one zip.

Are my images uploaded?

No. Each file is decoded and re-saved in your browser, on your device.

Can I go back from JPG to PNG?

You can convert a JPG to PNG, but it will not bring back detail or transparency the JPG dropped. Keep your original PNG if you might need it.