Images to PDF

A4 or Letter gives every page the same dimensions and places each image inside it, scaled to fit and centred. That is what you want for anything that will be printed or submitted, because a stack of pages the same size behaves predictably in a printer.

Fit to image makes each page exactly the size of its image, so there is no border and no letterboxing. Pages can differ in shape from one another, which is fine on screen and awkward on paper.

Match each image under orientation looks at whether the image is wider than it is tall and picks portrait or landscape for you. A batch of phone photos taken both ways round comes out with each one the right way up rather than half of them shrunk into the wrong shape.

JPGs are embedded exactly as they are, byte for byte, with no re-encoding, so no quality is lost on the way in. PNGs go in as PNGs. WebP is the exception: browsers can read it but a PDF cannot hold it, so the image is redrawn into a PNG first. That loses nothing visually but does make the file larger.

The image is placed at whatever size the page allows, but the pixels behind it are the full resolution ones. Zooming into the PDF shows the detail that was in the original photograph.

Which is also why the PDF can be large. Ten photos from a modern phone camera make a large PDF, because they were large to begin with. If the file size matters more than the detail, shrink the images before adding them.

How do I combine images into one PDF?

Add your JPGs or PNGs, drag them into the order you want, choose a page size, then save. You get a single PDF with one image per page.

Are my images uploaded to a server?

No. The page opens your file with JavaScript running in your own browser, does the work there, and hands you the result as a download. Nothing is uploaded, so there is no server copy to delete and no queue to wait in. You can check this yourself: open your browser's network tab, run the tool, and you will see no request carrying your file.

Which image formats work?

JPG and PNG go into the PDF directly, with their data untouched. WebP is converted to PNG by your browser first, which is lossless but makes the file bigger. HEIC from an iPhone is not supported by most browsers, so convert those to JPG first.

What is the difference between A4, Letter and fit to image?

A4 and Letter give every page the same fixed size and place the image inside it, scaled to fit and centred, which is what you want for something you will print. Fit to image makes each page exactly the size of the image on it, so there is no border and pages can differ in shape.

Will my photos lose quality?

JPGs are embedded exactly as they are, with no re-encoding, so there is no extra loss. PNGs keep their pixels too. The image is placed at whatever size the page allows, but the data behind it is the full resolution one, so zooming in shows the detail that was there.

Why is my PDF so large?

Because the images are stored at full resolution. Ten photos from a modern phone camera add up to a large PDF. Shrink the images before adding them if size matters more than detail.

Is this image to PDF converter free?

Yes, and there is no account, no email box and no watermark on the output. The tool is here because FORKSAI makes study software and this is a useful thing to give away.