JPG to PNG Converter

How to Use

Click the dashed upload area (labelled "Click to select an image", with helper text noting it accepts JPG, WebP, GIF, BMP, and any image format) and pick a file from your device. The tool accepts any browser-supported image, not just JPG. As soon as a valid image is selected the converter reads it as a data URL, draws it onto an HTML canvas at its original width and height, and re-encodes it as a PNG automatically; there are no quality sliders or settings to configure because PNG is lossless. When it finishes, a Result card appears showing the Original file size next to the new PNG file size so you can compare them at a glance. Press the "Download PNG" button to save the converted file, which keeps your original filename with a .png extension. Everything runs locally in JavaScript, so nothing is uploaded to a server.

Why This Tool Is Useful

A reliable JPG to PNG converter matters whenever you need a format that preserves every pixel exactly or that can carry transparency. PNG is lossless, so once your image is a PNG you can open, edit, and re-save it repeatedly without the cumulative "generational" quality loss that plagues JPG. It is also the right container for screenshots, UI mockups, diagrams, logos, and any graphic with sharp edges or large flat colour areas, where JPG's compression introduces fuzzy artefacts. Because this tool processes the image on your own machine using the Canvas API, it is fast, works offline once the page has loaded, and keeps private images private. And since it shows you both file sizes, you immediately see the trade-off you are making before you commit to the new file.

JPG vs PNG: the core difference and when to use each

The single biggest distinction is compression. JPG (also written JPEG) uses lossy compression: it permanently discards image data the human eye is unlikely to miss, which produces small files that are ideal for photographs and complex natural scenes. PNG uses lossless compression: it shrinks the file without throwing any pixels away, so the decoded image is identical to what went in.

That difference dictates the right choice. Reach for JPG when the priority is a small file for a photo-realistic image, such as a holiday photo or a product shot, and a tiny amount of quality loss is acceptable. Reach for PNG when you need crisp edges, exact colours, or transparency — logos, icons, charts, line art, and screenshots all belong in PNG. Converting a true photograph to PNG is usually counter-productive because it balloons the file size for no visible gain.

Convert a screenshot to PNG the right way

Screenshots are one of the most common reasons people search for a JPG to PNG converter, and PNG is genuinely the better home for them. Screenshots are full of text, window chrome, solid colour panels, and sharp horizontal and vertical lines — exactly the content that JPG's lossy compression mangles into blurry, ringing artefacts around the edges.

If your operating system already saved the screenshot as a JPG, drop it into this tool to get a clean PNG container. Just remember a hard truth covered below: re-encoding a JPG screenshot as PNG stops any further quality loss, but it cannot undo artefacts that the original JPG step already baked in. For the sharpest result, capture or export the screenshot as PNG from the start whenever your tool gives you the choice.

Converting JPG to PNG does NOT create a transparent background

This is the most important expectation to set, because it is the number one misconception. A JPG file has no alpha (transparency) channel at all — every pixel is fully opaque, including the background. When this converter re-encodes that image as PNG, it copies those opaque pixels faithfully. The PNG format supports transparency, but that does not mean your particular image suddenly gains a see-through background.

In other words, the result is a PNG that is capable of holding transparency but contains none, because there was none to begin with. If your goal is a logo or product photo with the background knocked out, format conversion is the wrong tool entirely.

To actually remove a background you need a dedicated background remover that detects the subject and erases the surrounding pixels, writing genuine transparency into the alpha channel. Converting first and erasing later is the correct order — but the conversion step alone will never do the erasing for you.

Two things JPG to PNG conversion can and cannot do

Because this tool is honest about its limits, it is worth stating plainly what a lossless PNG conversion does and does not achieve. Knowing this saves you from chasing quality that physics will not give back.

The conversion guarantees no further loss from this point on, and it produces a universally supported PNG. It does not perform any magic restoration.

• It CAN stop future quality loss — once the image is a lossless PNG, re-saving it repeatedly will not degrade it further.
• It CANNOT restore detail already destroyed by JPG compression — those pixels are gone for good and PNG only preserves what it receives.
• It CANNOT add transparency to a flat JPG — there is no background to remove without a dedicated tool.
• It CAN preserve the exact pixels of any image you feed it, including screenshots, graphics, and other PNGs.
• It often produces a LARGER file than the JPG, because lossless storage of photographic detail is simply bulkier.

How the in-browser conversion works

When you select a file, the tool reads it as a data URL, loads it into an in-memory Image element, and then paints it onto an HTML5 canvas sized to match the original width and height. It then calls the canvas toBlob method with the image/png type, which asks the browser to encode the pixels as a standards-compliant PNG.

Because PNG encoding is lossless, there are no quality or compression options to choose — the output is a faithful copy of whatever the canvas holds. All of this happens in your browser using JavaScript, with no network request, which is why it works on private images and continues to function even if your connection drops after the page has loaded.

Why is my PNG file bigger than the JPG?

Seeing the PNG come out several times larger than the source JPG surprises a lot of people, but it is completely expected for photographs. JPG achieved its small size by permanently discarding data through lossy compression. PNG refuses to discard anything, so when it stores the same photographic detail it needs far more bytes.

The Result card shows both sizes side by side precisely so you can make an informed decision. If the bloated size is a problem and you do not need transparency or pixel-perfect edges, the original JPG may have been the better format, or a modern format may serve you better.

• Photographs have millions of subtly varying pixels that lossless PNG cannot compress much.
• JPG threw that detail away to get small; PNG keeps it, so the file grows.
• Flat graphics, logos, and screenshots often compress well as PNG and can even be smaller.
• If small size matters more than transparency, consider keeping JPG or trying WebP.

JPG vs PNG comparison