Tiny Tiny Tools

Local browser image processing

PNG to JPG Converter

Convert PNG images to JPG for free, with transparency flattened onto white. Fast, private, and processed entirely in your browser.

No files selected

Your files will be listed here once you add them.

JPG quality

Processed locally in your browserYour files never leave this device. No uploads. No registration.

Understand the output

What This Tool Produces

  • A .jpg file with unchanged dimensions
  • A white fill behind transparent pixels
  • Measured source and output sizes
  • Quality-controlled batch conversion

How to Use This Tool

  1. Add PNG filesChoose one or more valid PNG images.
  2. Choose qualityUse a higher setting for fine detail or lower it when file size matters more.
  3. Check the backgroundConvert, confirm transparent areas look correct on white, then download.

Controls and Method

JPEG quality

Controls lossy re-encoding. It does not set a guaranteed percentage of quality or file-size reduction.

When JPG Is the Wrong Destination

Flattening is irreversible. If you need the subject without its background rather than on a white rectangle, removing the background keeps the alpha channel intact and gives you a PNG worth having.

If the goal was purely file size, JPEG is not automatically the winner: converting to WebP is usually smaller at the same visual quality, and resizing the image beats both. Going the other way is covered on JPG to PNG, including why it will not restore lost detail.

What Happens to Transparency?

Before PNG pixels are drawn, Tiny Tiny Tools fills the JPEG canvas with white. Fully transparent areas become white, and partially transparent edges are blended against white. The background is not user-selectable on this focused converter.

When PNG to JPG Helps

  • A photo PNG is too large for email or a form.
  • An upload system lists JPEG but not PNG.
  • A compatibility copy is needed for older software.
  • Transparency and pixel-perfect lossless storage are unnecessary.

When to Keep PNG

Keep PNG for logos, interface screenshots, sharp text, diagrams, and assets that must retain transparency. JPEG compression can add halos or ringing around high-contrast text and edges.

Practical Uses

  • Reducing the size of a photographic PNG
  • Preparing a JPG-only application upload
  • Creating an email-friendly copy
  • Opening an asset in JPEG-only software

Important Limitations

  • Output is lossy.
  • Transparency cannot be recovered from the JPG later.
  • Flat graphics may look worse or fail to become smaller.
  • The converter does not let the user choose a different background color.

Frequently Asked Questions

Will transparent PNG areas become black?

No. This converter fills the canvas white before JPEG export, so transparent areas become white.

Will PNG to JPG always reduce file size?

No. It often helps photographic PNGs, but simple or already optimized images can behave differently.

Does conversion change dimensions?

No. The decoded width and height stay the same.

Is JPG better for logos?

Usually not. PNG better preserves sharp edges and transparency. JPEG is generally better suited to photographs.

Can I convert the JPG back to the original PNG?

You can create a PNG later, but the original transparency and any detail lost during JPEG encoding will not return.