JPEG to PNG Image Converter

Why people move JPEG files into PNG

A JPEG is a finished, compact photograph. A PNG is a working file. That is the simplest way to think about this conversion. JPEG uses lossy compression: every save discards a little fine detail so the file stays small. PNG uses lossless compression: whatever pixels you put in are exactly the pixels you get back, no matter how many times you open and save it. PNG also supports a full alpha channel for transparency, which JPEG lacks entirely.

That difference explains the typical reasons to convert. Designers turn a JPEG into PNG before layering text, arrows or annotations on it, so repeated saves during editing do not keep degrading the picture. Developers want PNG for interface assets. Some print services, slide templates, school portals and app stores simply list PNG as the required format. And anyone who plans to cut out a background later in an image editor needs a format that can hold the transparent result.

What the JPEG to PNG converter does

This page uploads your JPEG to our server, decodes it, applies any resize or DPI setting you chose, and saves it again as PNG. The file returns to your browser with a .png extension and your original name preceded by a random prefix. Because PNG is lossless, this conversion adds no new compression damage of its own.

It also cannot remove damage that is already there. Any blockiness or colour smearing baked into the JPEG is copied faithfully into the PNG, pixel for pixel. Converting does not restore detail; it only stops further losses from future edits.

The file will almost certainly get bigger

Expect the result card to show an up arrow. A 400 KB holiday photo can easily become 2 MB to 5 MB as PNG, because lossless compression cannot throw anything away to save room. That is normal and not a sign of an error. If the destination has a strict size limit, PNG may simply be the wrong format for a photograph, and you should look at the size limit before switching.

How the Quality slider behaves for PNG

This is the most misunderstood control on the page, so it is worth reading. The slider runs from 10% to 100% and its hint says "Higher % = Better Quality, Larger Size". That hint describes lossy formats. For PNG the server translates the percentage into a zlib compression level from 0 to 9 instead. With the ImageMagick library, which the tool uses when the server has it, 100% maps to level 9, the most thorough compression; on the fallback GD library the mapping runs the other way.

In plain terms:

• Image quality is identical at every slider position, because PNG is always lossless.
• The slider only changes how hard the encoder works to pack the same pixels, so it nudges file size and encoding time, not appearance.
• The difference between the lightest and heaviest setting is usually modest.

So if you want the lightest possible PNG, process once near 100% and once near 10% and keep the smaller result. Either way, the savings are small compared with what resizing achieves.

Step by step: JPEG in, PNG out

1. Look at the Configuration card. Convert Format is already set to PNG on this page.
2. Optional: leave Quality where it is. For PNG it only affects compression effort, never how the image looks.
3. Optional: to make the image smaller in pixels, choose a Resize Unit. Pixel lets you fill only Width or only Height while keeping proportions; Percent and the print units need both values.
4. Optional: type a DPI value, for example 300 for a print shop or 72 for screen work.
5. Add images in Select Images. Drag them in or press Select File; the file dialog on this page is set to JPEG images.
6. Run Process on a single card, or Process Queue to convert the whole list with the same settings.
7. Check the Output panel: weight, dimensions, DPI and format badge. Click the thumbnail for a larger preview.
8. Press Download, or Copy Base64 if you need a data URL.

Practical scenarios

Annotating a screenshot taken as JPEG

Some phones save screenshots as JPEG. Convert to PNG first, then add your arrows and labels in an editor. Each save after that stays sharp, and text you add will not pick up the halo of artefacts that JPEG adds around hard edges.

Preparing a cut-out

This tool does not remove backgrounds and does not add transparency by itself. What it gives you is a PNG that can store transparency once your editor erases the background. If you saved the cut-out as JPEG instead, the transparent area would be filled with a solid colour.

Meeting a PNG-only upload rule

When a portal insists on PNG, combine conversion and resizing in one pass so the PNG is not needlessly huge. A photo resized to 1200 pixels wide is far lighter than one at full camera resolution.

Recommendations

• Resize before or during conversion whenever the final display size is known.
• Start from the best JPEG you have. PNG preserves its flaws exactly.
• Use PNG for intermediate editing files and switch back to JPEG or WEBP for the final web upload of a photo.
• Keep both whole numbers in the Dimensions box when using Percent: 50 and 50 halves the image.

Common mistakes

• Converting to PNG to "improve" a blurry or pixelated JPEG. The pixels do not change.
• Choosing PNG for a photo upload with a small KB limit. The PNG will likely exceed it.
• Expecting a transparent background straight away. The photo's background is still there in the PNG.
• Picking SVG in the format list. The tool is not a vector tracer.

Technical limits

• Maximum upload size is 10 MB per file; accepted inputs are JPG, JPEG, PNG, GIF, WEBP, JIFF and BMP.
• Dimensions and DPI accept whole numbers only.
• Physical units are converted to pixels with your DPI value, or 96 DPI if the field is left empty.
• Orientation tags are applied, so the PNG comes out upright, and embedded metadata such as EXIF and GPS is stripped by default.
• A batch run uses one shared configuration; if one image fails, the batch shows an error and you can process the remaining cards individually.
• Pictures added via From URL download without their original name.
• No crop, rotate, flip or zoom controls are part of this converter.

How your image is handled

The work is done on our server, not inside the browser. The uploaded JPEG is processed by a server-side image library; the finished PNG is encoded into the response as Base64 and the server's temporary copy is deleted. No account is required. If company policy does not allow images to leave your device, use offline software instead.

Going the other way later? PNG to JPEG turns a finished PNG back into a compact photo file, and Convert to PNG accepts GIF, WEBP and BMP sources as well.

Frequently Asked Questions