Convert PNG to JPG with a white background

Check whether JPG is the right destination

JPG does not store transparent pixels. LM Tools puts a white background behind the image before encoding it, so transparent corners become opaque white. If the destination needs a transparent logo, keep PNG or choose WebP only when the destination accepts it.

Text, screenshots and flat graphics can acquire visible marks around sharp edges after JPG encoding. Keep the source file so you can make another export without repeatedly compressing a JPG. Conversion can also remove metadata; the result is not a replacement for an archival original.

Convert a batch without changing its dimensions

1. Open the PNG to JPG tool and add your images, or use the downloadable transparent test artwork below.
2. Choose PNG → JPG. The shortcut uses 90% quality, original proportions, no rotation and no target-size limit. A maximum long edge of 0 preserves pixel dimensions.
3. Process the batch. Open Compare on a result and inspect transparent corners, fine lines and text edges. Check the displayed dimensions before downloading.
4. Save individual results or prepare the ZIP. To reduce a result further, choose Compress these files; this carries the completed files into the next tool without selecting them again.

Up to 20 JPG, PNG or WebP images are accepted: 15 MB per file, 60 MB per batch and 24 megapixels per image. HEIC, AVIF and animation preservation are not supported. A file outside these limits needs a different preparation step.

An honest example: conversion can increase the size

Our source PNG is 9,130 bytes. A tested 90% JPG export is 20,741 bytes, with the same 1000 × 640 dimensions and white corner pixels. That is larger, not smaller. A simple drawing can be very compact as PNG, so a JPG export is not automatically an improvement in storage size.

Download both original files and compare them. Your browser encoder may produce a different byte count. Treat this example as a reproducible check of white-background conversion, not a promise of a particular compression ratio.

Original test file

Tested browser output

Original test file ↓Tested browser output ↓

Choose your next step deliberately

If you need a smaller attachment, send the completed results to the compression tool. Match the target unit to the receiving website and inspect the new output. If you need fewer pixels, use Resize these files and enter a maximum long edge; LM Tools keeps proportions and does not enlarge a smaller input.

The result handoff replaces the current image queue and keeps up to three earlier steps in this page’s memory. Back one step restores the previous inputs, settings and results. Refreshing or leaving clears these steps, so download anything you need first. Each new encoding may lose detail; if you only need to tune the same operation, change its settings and process the current inputs again.