Does converting JPG to PNG improve image quality?

No, it does not. PNG is a lossless format, but that does not mean it restores information your file has already lost. Detail discarded during JPG compression is gone permanently; when you convert to PNG, the image is preserved exactly as it looks at that moment, and existing flaws such as blocking and ringing come along with it. The benefit PNG gives you is that no new quality loss occurs every time you save the file from that point on.

Why did the file size grow so much after conversion?

JPG uses lossy compression; it shrinks the file by throwing away detail the eye struggles to notice. PNG discards no pixel information at all, it simply packs repeating patterns in a lossless way. In content like photographs, where nearly every pixel differs from its neighbour, there is little repetition to pack, so the PNG output can end up several times larger than the original JPG. This is expected behaviour, not a bug.

Does converting JPG to PNG make the background transparent?

Not on its own. The PNG format supports transparency, but conversion only changes the format; if the image has a white background, it stays white in the PNG too. To get transparency you have to remove the background separately, meaning you apply a background removal step. Format conversion prepares the container that makes this possible, it does not perform the operation itself.

When should I not convert JPG to PNG?

If you are going to publish the image on a website as-is and you do not need transparency, leaving it as JPG is usually the better call; converting to PNG inflates page weight for nothing. The same goes for sending a photo as an email attachment, where the conversion costs you space without any gain. Choose PNG for working files you intend to edit or add transparency to.

How to Convert a JPG File to PNG: Step by Step, With Realistic Expectations

Why do we convert JPG to PNG?

JPG to PNG conversion is one of the most searched image tasks online, but the reason behind it is usually misunderstood. People often convert because they heard that "PNG is a higher-quality format," then wonder why the file never got any sharper. In reality this conversion has three legitimate use cases: turning an image into a working file you will edit, preparing it so its background can be made transparent, and handing a file to a system or piece of software that only accepts PNG.

In this article we walk through the conversion step by step, but more importantly we clarify when it actually serves you and when it just bloats your files for no reason.

What technically happens during conversion?

When a JPG file is opened, the compressed data is decoded into a raw array of pixels. That raw array is exactly the image you see on screen. Saving to PNG means repacking that raw array with a lossless compression algorithm (DEFLATE). Lossless means that when you reopen the file, you get bit-for-bit identical pixels.

Here is the critical point: PNG's losslessness preserves the image as it exists at the moment of conversion — it does not bring back information JPG compression discarded earlier. If your photo has 8x8 blocking or halos around sharp edges, PNG will faithfully preserve them. In other words, PNG is not a repair tool, it is a freezer.

Step-by-step conversion

1. Pick the right source file. If you have several copies of the same photo, use the least processed, highest-resolution one. A JPG that came through WhatsApp or has been re-saved a few times carries far more compression traces than the original, and you will carry those straight into the PNG.

2. Open the JPG to PNG converter and drag and drop your file. For a single image the process takes a few seconds.

3. Check the output at 100% zoom. Open the PNG file and inspect it at its native size. What you should see: an image identical to the original. If you notice a difference, something is wrong with the source file.

4. Be ready for the file size. An 800 KB photo JPG can grow to 4–6 MB as a PNG. That is normal. If the size is a problem for you, this is exactly the moment to reconsider whether the conversion is really necessary.

5. Do your subsequent edits on the PNG. This is where the real payoff of conversion appears: crop the PNG, add text, correct colour and save again — no new quality loss occurs with each save. Had you repeated the same operations on the JPG, every save would have stacked a fresh round of compression artefacts on top of the last.

When this conversion genuinely adds value

When you have multi-stage editing ahead. If you are going to edit an image across several sessions, it makes sense to convert to PNG in the first step and keep your working file as PNG. Only at the very end do you export the publish-ready version as JPG or WEBP. This is the standard approach in professional workflows.

When you are going to remove the background. A transparent background can only be stored in PNG, WEBP and similar formats that support an alpha channel. There is no such thing as transparency in JPG. If you are cutting out a product photo's background to use it on different surfaces, the output must be PNG.

When a system requires PNG. Some document management systems, e-signature platforms, prepress tools or corporate templates accept nothing but PNG. In that case it is not a matter of preference but of compatibility.

With screenshots, graphics or images containing text. If the content is not a photograph but a screenshot, table, diagram or hard-edged graphic, PNG both looks cleaner and can sometimes even be smaller than JPG. That is because this kind of content has large areas of flat colour, and lossless compression packs them efficiently.

A common mistake to avoid

The most frequent mistake is converting an image to PNG and then back to JPG in an attempt to "clean it up." This cycle fixes nothing; on the contrary, the second JPG save adds another round of compression and the image degrades a little further. Bouncing between formats does not improve quality — at best it holds it steady.

The second common mistake is converting every photo on a website to PNG "so it looks better quality." That multiplies page size several times over, lengthens load times and delivers no visible gain to the visitor. The right web format for photographs is JPG or WEBP.

In summary

JPG to PNG conversion takes seconds with the right tool, but it only makes sense when it is the right decision. This conversion does not bring quality back — it stops future losses. Do it if you are going to add transparency, edit in multiple steps, or if the other party wants PNG. If you are publishing the image as-is, leaving it as JPG is both faster and visually identical.