PNG to JPEG Image Converter

From heavy PNG to light JPEG

PNG files are everywhere: screenshots, exported slides, design mock-ups, scanned forms saved by default settings, photos sent from apps that prefer lossless output. PNG is excellent for crisp lines and transparency, but when the content is a photograph or a large colourful scene, PNG wastes a lot of space. The same picture as JPEG is often five to ten times lighter with no difference most viewers would notice.

The PNG to JPEG Image Converter exists for that trade. It re-encodes your PNG as a JPEG on our server, applies the compression level you choose, and returns a .jpeg file. Typical reasons to use it: an exam or job portal that accepts only JPEG with a KB ceiling, an email attachment limit, a slow website full of PNG photos, or a print lab that asks for JPEG.

Understanding what you give up

Two properties of PNG do not survive the journey.

Transparency

JPEG has no alpha channel. Every pixel must be fully opaque. A logo on a transparent background, a cut-out product photo or a sticker will lose its see-through areas, and this converter has no background colour option, so you cannot choose what fills them. Depending on how the PNG was saved, the hidden colour in those pixels might show up as black, white or something else. If the PNG has transparency and the result matters, place it on a solid background in an editor first, or keep it as PNG.

Perfect edges

JPEG compresses in small blocks and smooths fine detail. On photos that is invisible. On text, thin lines, charts and user interface screenshots, it can create faint smudges or "mosquito noise" around letters, especially at lower quality. For a screenshot that must stay razor sharp, use a higher Quality value or keep PNG.

Quick decision guide

Configuring the conversion

In the Configuration card the Convert Format menu is already set to JPEG. Three other controls shape the result:

Quality is the main lever. The slider spans 10% to 100% and starts at 75%. For JPEG it works exactly as labelled: higher means better looking and heavier, lower means lighter and softer. For photographs, 70% to 85% is a sensible range. For scans with text, stay at 80% or above.

Resize Unit and the Dimensions box let you reduce the pixel size in the same pass. A 4000 pixel wide PNG screenshot from a high-resolution monitor rarely needs to stay that big. Choose Pixel and enter a Width, or choose Percent and enter the same number in both boxes, such as 50 and 50.

DPI writes a resolution value into the file. It also controls how the Inch, Centimeter and Millimeter units are turned into pixels. Without it, the server assumes 96.

Doing it: a worked example

Say a job portal wants a JPEG under 200 KB and your scanned certificate is a 3.2 MB PNG at 2480 by 3508 pixels.

1. Keep Convert Format on JPEG and set Quality to about 75%.
2. Choose Resize Unit Pixel and type 1240 in Width, leaving Height empty so the proportions are kept.
3. Drag the PNG onto the Select Images box, or press Select File; the file dialog on this page is set to PNG images.
4. Press Process on the card that appears in the Upload Queue.
5. Read the output weight on the green card. If it is still above 200 KB, lower Quality to 65% and press Process again on the same card. If text looks blurred, raise Quality and reduce Width a little instead.
6. Press Download when the numbers fit.

The percentage shown beside the output weight tells you how much smaller the JPEG is than the PNG you started with.

Batch conversion of a PNG folder

Select many PNG files at once or drag a group onto the box. Each becomes a card. Set the configuration once, then press Process Queue or Process All; the server converts the whole set with those settings and fills in each card's Output panel. If any file in the run fails, the batch shows an error. Remove the problem card with its cross button and run the queue again. PNGs that are already online can join the queue through From URL: one address per line, then Process in that box.

Tips

• Check transparency before converting. Open the PNG on a checkerboard background in any editor; if you see the checkerboard, decide what colour should replace it.
• Reduce dimensions first, then quality. Fewer pixels usually save more than a lower Quality value and look cleaner.
• Zoom the output by clicking its thumbnail; press Escape to close the preview.
• Keep the original PNG as your master file for future edits.

What not to do

• Do not convert logos, icons or stickers with transparent areas if you need those areas to stay transparent.
• Do not use very low Quality values on documents; small print becomes unreadable.
• Do not convert a JPEG back and forth through PNG repeatedly. Each return to JPEG adds compression loss again.

Limits and behaviour

• Uploads may be up to 10 MB each and must be JPG, JPEG, PNG, GIF, WEBP, JIFF or BMP images.
• Width, Height and DPI accept whole numbers only.
• Percent and print units need both Width and Height filled to behave as expected.
• Metadata is stripped from the output by default and orientation tags are applied before saving.
• There are no crop, rotate, flip or zoom editing tools on this page.
• Results fetched from a URL download without the original file name.

Privacy

Your PNG is uploaded and converted on our server by a server-side image library; nothing is converted locally in the browser. The JPEG is returned inside the response as Base64, which is also what the Copy Base64 button copies, and the server deletes its temporary file once that response is built.

Related: JPEG to PNG for the reverse trip, and Convert to JPG if the destination wants the .jpg spelling.

Frequently Asked Questions