No second compression
A JPEG photo is already compressed. Many converters decode it and compress it again, which loses detail and sometimes makes the file bigger. Here the original JPEG bytes are placed into the PDF unchanged, unless the photo needs turning upright (phones store orientation as a flag, which is applied here).
If the PDF is too big for where it is going, compress it afterwards to an exact size.
Steps
- Add JPG files (from your phone or computer).
- Drag to reorder.
- Pick a page size: as is, Letter or A4.
- Save and download.
Limits, stated plainly
- CMYK JPEGs from professional cameras may look different in some viewers.
Engine: pdf-lib in a Web Worker. Your file is not uploaded; check it yourself.