What is the best png to jpg converter without losing quality?

Xn Convert is a free, offline batch converter that handles 500+ input formats and around 70 output formats. It runs entirely on your machine with no uploads, no watermarks, and no file limits for private use.

For your specific goal to convert PNG to JPG without losing quality, the practical approach is to set the quality slider high enough that the loss is invisible to the eye. The recommended range is 85–92 for most images. At quality 90–95, the difference from the original is typically indistinguishable for photos and general graphics.

Setting It Up for Quality:

1. Drag your PNG files into the Input tab.
2. Go to the Output tab, select JPEG as the format.
3. Set the quality value to 90–95.
4. Check "Use estimated quality" and "Optimize Huffman table" — both reduce file size slightly without visible quality loss.
5. Choose a separate output folder so your originals stay intact.
6. Click Convert.

A forum user ran a direct test: a 450 KB PNG saved as JPG at quality 100 shrank to 251 KB, and at quality 90 it dropped to 77 KB. The smaller file showed visible degradation at 90, while quality 100 looked fine but nearly doubled the size compared to 90. For a large 1.2 MB image, quality 85 showed no visible loss and produced a 1.3 MB file, while quality 100 ballooned to 3.4 MB.

If you want to convert PNG to JPG without losing quality in the strictest sense, you would need to save at quality 100 — but even then, JPEG compression is still technically lossy, just barely perceptible. And at quality 100, the JPG can end up larger than the original PNG, defeating the purpose of conversion. The realistic goal is "visually lossless," not mathematically lossless.