How to Convert PNG to JPG Without Losing Quality (and When Not)

Guide · 7 min read · updated 2026-10-16 · Leer en español

You want to upload an image to a form, an online store or an email, and you are told it has to be a JPG. But what you have is a PNG, maybe a screenshot or a logo, and it is heavier than allowed. Switching from PNG to JPG looks trivial, yet it hides some important decisions: what happens to transparency, how much quality you are willing to give up, and when the change simply makes the image worse. This guide explains all of that, with a direct step-by-step in Rayo PDF GO.

How to Convert PNG to JPG Without Losing Quality (and When Not)

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PNG vs. JPG: what really sets them apart

PNG stores every pixel exactly as it is, without discarding information. That is why screenshots, logos, graphics and text look sharp and clean, with perfect edges. PNG also supports transparency, so a logo can sit on any background without a box showing around it. The price is size: a photo saved as PNG can weigh several times more than the same photo as a JPG.

JPG works differently. It discards details the eye can barely tell apart in order to shrink the file a lot, and it does this especially well with photographs, where colors change smoothly. That loss is permanent: every time you save a JPG with compression, you lose a little more information. And it does not support transparency, so transparent areas get filled with a solid color.

Understanding this avoids the most common mistake: converting everything to JPG out of habit. A family photo, a product shot or a landscape benefits from the change. A logo with thin text or a screenshot of a spreadsheet does not: the edges turn slightly fuzzy and little smudges appear around the letters.

When it does make sense to go from PNG to JPG

The typical case is file size. Many job portals, universities, online stores and government systems set a cap, for example 1 MB or 2 MB per image, and reject anything larger. A PNG photo from a modern phone can easily blow past that cap, while the JPG version fits with no trouble and looks practically identical.

It also makes sense when you are sending lots of images by email or messaging apps. Twenty PNG photos can add up to hundreds of megabytes of attachments; as JPGs, the same set fits comfortably. And if you are building a web page or a catalog, lighter images mean pages that load faster, which your visitors will appreciate, especially on mobile data.

A third case is compatibility. Some older platforms, print programs or forms only accept JPG. If the platform requires it, there is no debate: convert, but always keep the original PNG in case you need to edit it later.

When it is better to leave it as PNG

If the image has text, thin lines or a few flat colors, such as a diagram, a chart or a screenshot of an app, PNG will look better and probably weigh little, because that kind of content compresses very well without loss. Converting it to JPG can increase the file size instead of reducing it, and also make it less sharp.

If you need transparency, there is no way around it either. A logo, a stamp or a product cutout on a transparent background will lose that property when it becomes a JPG, and the transparent area will be filled with white. If you later want to place it on a colored background, a visible box will remain and ruin the design.

And if you plan to keep editing the image, always work from the PNG or the original file and convert to JPG only at the end, as an export step. Editing and re-saving a JPG several times degrades quality cumulatively.

How to do it with Rayo PDF GO

Rayo PDF GO includes an image converter that changes the format directly between JPG, PNG, WebP, GIF, BMP and TIFF, in batches and on your own device. It is available on the web, in the apps and in the converter on the home page, and you do not need to go through any PDF.

1) Open the Rayo PDF GO image converter on the web (rayopdfgo.com/app, with a free account) or in the phone or computer app.

2) Select the PNG files you want to convert. You can choose several at once, for example all the screenshots or photos in a folder, and they will be processed in a single batch.

3) Choose JPG as the output format and tap convert. Each PNG becomes a separate JPG, without touching the original.

4) Save the results on your device and open them to check that they look good. If you also need to cut the file size, run them through Compress image or reduce their dimensions with Resize image. Everything happens on your device: the images are not uploaded to any server. On the free plan there are per-batch limits, such as up to 10 images at a time; Premium removes them.

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What happens to transparency when you convert

A PNG with a transparent background cannot stay that way as a JPG. What happens is that the transparent areas are filled with white. Even so, do not take anything for granted: open the converted image and check it before using it.

If your logo has dark letters on a transparent background, the white fill usually looks fine on a light page. But if the letters are white, you can end up with a white box containing white letters, in other words an apparently blank image. Before converting, think about what background it will be shown on and, if needed, place the image on the right color first.

When you need to keep transparency, the answer is not JPG. Ask whether the platform accepts PNG or WebP; many do, even if their error message says otherwise. And if the requirement is strict, assume a white background and verify that the design looks fine that way.

How to cut file size without it showing

The golden rule is not to compress more than necessary. If the limit is 2 MB and your JPG weighs 1.8 MB, there is no point in shrinking it further. Start with moderate compression and compare against the original by zooming in on the delicate areas: faces, text, object edges and sky gradients, where blotches show up first.

Reducing the dimensions helps too. A photo 4,000 pixels wide is overkill for a screen or a form; with Resize image you can bring it down to a reasonable size, and the file weight drops much more than by lowering quality alone, with less visible loss. For a profile photo or a web product photo, 1,200 to 2,000 pixels wide is usually more than enough.

Always run your tests on a copy. Keep the original PNG in a folder, work on the duplicate and compare. That way you can go back easily if you do not like the result, and you avoid the classic mistake of overwriting the only copy you had.

Common mistakes and final tips

A common mistake is renaming the file from .png to .jpg expecting that to convert it. It does not work: it only changes the label, not the content, and many programs will fail to open it or will reject it. A real conversion requires re-encoding the image with a tool.

Another mistake is converting repeatedly: from PNG to JPG, back to PNG and then to JPG again. Every trip through JPG compresses it again and the image degrades. Do the conversion once, from the most faithful file you have, and save the result as the final version.

Finally, take care of your privacy. If the image is a screenshot with personal data, such as a payment receipt or a conversation, think about who will receive it. Rayo PDF GO works on your device without uploading files, but what you send afterward depends on the channel you use. Review it, cover up anything unnecessary and send only what is needed.

Real-world examples: online store, job search and social media

A woman who sells clothing online photographs her garments with her phone and saves them as PNG by default. Her platform caps each image at 2 MB and asks for JPG. She reduces the size, converts, checks the fabric colors against a reference photo and uploads the whole catalog with no rejections.

A person applying for a job has to attach an ID-style photo as a JPG of at most 500 KB. They first resize it to a few hundred pixels wide, convert it and check the file weight. Because they start from reasonable dimensions, they do not have to sacrifice sharpness when compressing.

A content creator prepares thumbnails with large text and flat colors. They decide to keep the design as a PNG so the letters stay clean and to export to JPG only the copy they upload to a platform that does not accept PNG. That way they keep the editable file and avoid degrading the original.

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Frequently asked questions

Does converting PNG to JPG reduce quality?

Yes, a little, because JPG uses lossy compression. With photos the difference is usually almost invisible; with logos and text it is more noticeable. That is why you should always keep the original PNG.

What happens to a transparent background?

JPG does not support transparency, so transparent areas are filled with white. Check the resulting image before using it.

Does Rayo PDF GO convert PNG to JPG directly?

Yes. Its image converter goes directly between JPG, PNG, WebP, GIF, BMP and TIFF, in batches and on your device.

Does changing the file extension work?

No. Renaming from .png to .jpg converts nothing and can cause errors. You need a tool that re-encodes the image.

Why is my JPG bigger than the PNG?

With graphics that have few colors or screenshots with text, PNG compresses very well and JPG sometimes cannot improve on it. In those cases it is better to keep it as a PNG.

Are my images uploaded to a server?

No. Processing happens on your device and the files are not sent to any server.