JPG to PDF takes photographs and screenshots and writes them into a PDF you can send as one attachment. Each image becomes one page. The first file in the list is page 1, the next file is page 2, and so on. PNG files are accepted on the same form, so a folder of mixed exports does not need a second converter. Image to PDF, on this site, means that same job: JPG and PNG in, one PDF out. This page only accepts JPG and PNG. For HEIC, GIF, WebP, SVG, or PNG to JPG, use the file converter, which runs in the browser as well. To shrink a photo toward a size such as 100 KB, use compress image.
Nothing is uploaded. The button loads pdf-lib in the tab and embeds the bytes of each image. There is no account, no email, and no expiry link, because the download is a normal PDF. Close the tab and the only copy left is the one you saved. That matters for scans of an identity card, a signed form, or a child's school letter. Do not use a converter that asks you to sign in before it will return the file.
Page size follows the picture, then A4. The browser reads the pixel width and height. Those pixels are treated as 96 per inch, which is the usual screen density, and turned into PDF points. If that rectangle is larger than A4 (210 by 297 millimetres), it is scaled down until it fits, keeping the same proportions. A portrait photo stays portrait. A wide screenshot stays wide, with the page no larger than A4. A tiny icon is not blown up to fill the paper, so it does not become a blurry square in the corner of a huge empty page. The PDF page is the fitted size, not a forced A4 sheet with a postage stamp in the middle.
The file has to actually be a JPEG or a PNG. Renaming a Word document to end in .jpg does not make it an image, and the page will say which file failed. A broken download fails the same way. Phone photos that are still HEIC look like pictures in the gallery and still are not JPEG until you export them. On many phones the share sheet has a "most compatible" or JPEG option. Use that, then add the new file. The converter does not run optical character recognition. Words in a photo stay as pixels. You cannot search them in the PDF, and you cannot select them.
Order is yours to set. Add the images in the order you want the reader to see. If a multi-select comes back sorted by name and you wanted capture order, add them one at a time. The page count after a successful run equals the number of images. If it does not, one file was skipped only because the conversion stopped on an error, and the note names the problem. There is no silent drop. Very large camera originals can use a lot of memory, because each image is held while the PDF is built. If the tab stalls, convert a dozen at a time and then merge PDF the pieces.
This is not a compressor. Embedding a JPG keeps that JPEG data, and embedding a PNG keeps the PNG, so a folder of big photos makes a big PDF. If you need a smaller file afterwards, open compress PDF and read the honest limit there: pages are redrawn as JPEG images, text that was real text would stop being selectable, and a target such as 200 KB is a best effort. For a PNG that you want called out on its own, the PNG to PDF page is this converter. The image to PDF page is the same form again, for the broader phrase.
What the tool will not do is worth saying. It will not rotate a sideways photo for you, add a caption, or place two pictures on one page. Rotate the image before you add it. It will not merge an existing PDF into the same click. Make the image PDF first, then use merge if a contract has to sit in front. It will not password-protect the result. If the pictures are sensitive, save the PDF somewhere private and do not leave the originals in a shared downloads folder. The page itself forgets them when you leave.