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KazamTools

PNG to JPG Converter

Smaller JPG files from PNG, with your choice of background colour.

Files are processed in your browser and never uploaded.How it works

or drop PNG files here: screenshots, graphics or photos. No limit on how many.

90

90 is a good default: it looks like the original at a fraction of the size.

Background for transparent areas

JPG cannot store transparency, so see-through areas are filled with this colour.

How to use the PNG to JPG

  1. 1Click Choose images or drop PNG files onto the box.
  2. 2Pick a background colour for transparent areas (white is the default).
  3. 3Adjust the quality if you like. 90 looks like the original.
  4. 4Download the JPGs individually or as one ZIP.

Why convert PNG to JPG?

PNG is lossless: it keeps every pixel exactly. That is perfect for logos and screenshots, but wasteful for photos. A photo saved as PNG is often four or five times bigger than the same photo as a JPG, with no visible benefit. Converting to JPG makes it small enough for email attachments, upload forms with size limits, and websites that load quickly.

Common reasons people convert:

  • An application form or marketplace accepts only JPG.
  • A phone or editing app exported a photo as PNG and it is several megabytes.
  • You want to email or message a batch of screenshots and they are too large.

What happens to transparency

PNG can store transparent and partly transparent pixels; JPG cannot. During conversion every pixel is blended with the background colour you choose:

result = pixel colour × opacity + background × (1 − opacity)

A fully transparent pixel becomes pure background. A red pixel at 50% opacity over white becomes a light red (255, 127, 127). That is why a logo with soft, anti-aliased edges still looks smooth on white after conversion, but shows a white fringe if you later place it on a dark page. Choose a background that matches where the image will be used, or keep the PNG when you need real transparency.

Real numbers

We converted lossless PNG versions of two 1920 × 1200 photos:

Image PNG JPG at quality 90 Saving
Hills and sky photo 1.6 MB 301 KB 81%
Forest lake photo 1.9 MB 314 KB 84%

Screenshots behave differently. A screenshot of a mostly white web page may be only 100–300 KB as PNG, because PNG is excellent at large flat areas. As a JPG it may not be much smaller and the text gains faint smudges. For screenshots, either keep PNG or use a high quality (90–95).

Choosing the quality

  • 90 (default): no visible difference for photos, still a large saving.
  • 80–85: smaller files for web pages and messages; differences only show when zoomed in.
  • 95–100: for text, line drawings and anything you will print. Files are larger.

If you need a specific size, such as “under 200 KB” for a form, use Compress to KB, which picks the quality for you.

Other ways to convert

  • Windows: open the PNG in Paint and choose File → Save as → JPEG picture. Transparent areas turn white.
  • Mac: open it in Preview, choose File → Export, set the format to JPEG and use the quality slider.
  • Phones: iPhone and Android have no built-in converter; this page works in Safari and Chrome.

Those tools convert one file at a time and do not let you choose the background colour. Here you can drop a whole folder, set the colour once and download a ZIP.

Privacy and file names

Files are converted on your device and are never uploaded, which matters for screenshots of chats, bank apps or documents. Output files keep their names with a new extension, for example Screenshot 2026-10-21 at 09.15.png becomes Screenshot 2026-10-21 at 09.15.jpg. Text chunks that some apps hide inside PNG files are not copied.

Next steps

Going the other way? Use JPG to PNG. To shrink images without changing format, try Compress Image. To put the JPGs into one document, use JPG to PDF.

Common conversions

Frequently asked questions

What happens to transparent backgrounds?

JPG cannot store transparency, so transparent and semi-transparent pixels are blended onto a solid colour. White is the default; you can pick black or any custom colour.

How much smaller is the JPG?

For photos saved as PNG, usually 70–90% smaller. In our test a 1.6 MB PNG photo became a 301 KB JPG at quality 90. Screenshots with flat colours shrink less and can show soft edges around text.

Should I convert screenshots and logos to JPG?

Usually not. JPG blurs sharp edges and text slightly. Keep logos and screenshots as PNG, or use quality 95 if a site insists on JPG.

Can I convert many PNG files at once?

Yes, there is no limit. Files keep their names, so Screenshot 1.png becomes Screenshot 1.jpg, and you can download everything as a ZIP.

Are my files uploaded?

No. Everything runs in your browser, so screenshots with private information stay on your device.

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