What it does with your images
A JPEG is embedded exactly as it is: the PDF stores the original compressed bytes with a
DCTDecode filter, so the image is not re-compressed and no quality is lost in
conversion. PNG and HEIC files are decoded and re-encoded as JPEG once, at high quality,
because PDF does not support every PNG variant cleanly.
Every page is either the paper size you picked — with the photo scaled to fit inside the margin and centred — or the photo's own dimensions when you choose Fit to image.
Practical notes
- The PDF is roughly the sum of your images plus a few kilobytes of structure. It will not be smaller than the photos.
- Re-encoding PNG and HEIC strips their metadata, so GPS data does not travel into the PDF.
- Phone photos are large; ten 12-megapixel images make a 40–60 MB PDF. Use the compressor first if you need to email it.
Questions
Are my images uploaded anywhere?
No. The PDF is assembled in your browser from the bytes you selected. There is no upload endpoint on this site — disconnect from the internet after the page loads and the converter still works.
Is the image quality reduced?
Not for JPEGs — the original compressed data is embedded untouched. PNG and HEIC are converted to JPEG at high quality, so there is one generation of re-encoding.
Why is the PDF so large?
Because it contains the photos at full size. A PDF made from ten phone photos is a large file by nature. Shrink them first if the destination has a size limit.
Can I reorder or remove pages?
Yes — use the arrows and the × on each row. The PDF follows the order shown in the list.