How to Convert Images to PDF

A PDF is the right container whenever several images need to travel as one document: a scanned contract, receipts for an expense claim, photos of ID for a form, a portfolio you want to arrive in a fixed order. Sending eight loose JPEGs invites them to be opened in the wrong order, or to lose one.

This guide covers combining images into a single PDF, choosing the right page setup, and keeping the file small enough to email.

Combine images into one PDF

1. Open the image to PDF converter. 2. Add your images. Multiple files at once is the normal case. 3. Check the order. Page order follows the order the images are listed, so this is the step worth a second look — especially for a multi-page scan. 4. Pick a page size (see below). 5. Convert, then download the PDF.

For photos specifically, the JPG to PDF converter is the same engine with JPEG defaults. For iPhone photos, HEIC to PDF handles the conversion in one step.

Choosing a page size

Three options, and the right one depends on where the PDF is going:

• Fit to image — each page matches its image's own proportions exactly. Nothing is letterboxed and nothing is cropped. Best for on-screen viewing, portfolios, and anything that will not be printed.
• A4 — 210×297mm, the standard nearly everywhere outside North America. Use it for documents someone will print or file.
• Letter — 8.5×11 inches, the North American standard. Same reasoning, different geography.

With A4 or Letter, images are scaled to fit inside the page and centred, so a landscape photo on a portrait page leaves white space above and below. That is correct behaviour for a printable document, but it is why fit to image usually looks better if nobody is printing it.

JPEG input stays lossless

Worth knowing, because it is unusual: when you feed this tool a JPEG, the original compressed bytes are embedded directly into the PDF using the format's native JPEG support. The image is not decoded and re-encoded, so no quality is lost at all — the picture inside the PDF is byte-identical to the file you started with.

Other formats — PNG, WebP, HEIC — are converted to JPEG on the way in, because that is what gets embedded. So for those there is one encode step, and the practical advice follows from it:

• If your source is already JPEG, you lose nothing. Do not pre-convert it to anything.
• If your source is a PNG screenshot or line art, the conversion to JPEG will soften hard edges and text slightly. Text-heavy screenshots are the one case where a PDF made from PNGs can look worse than you expect.

Keeping the file small

PDFs of photos get large quickly, and mail servers commonly reject attachments over 10MB or so. The size is driven almost entirely by the images inside, so fix it before converting:

1. Downscale first. A 48-megapixel phone photo carries far more detail than any page needs. Around 1500–2000 pixels on the long edge is plenty for both screen reading and printing. Use the image resizer. 2. Then compress. Run the images through the image compressor at quality 75–80. 3. Then build the PDF.

Doing it in that order matters: resizing removes pixels the compressor would otherwise spend bytes preserving. The two steps together routinely cut a PDF by 80% or more with no visible difference at reading size.

For scanned documents

A few adjustments make scans much more usable:

• Straighten before converting. A tilted scan is harder to read and looks careless. Rotate the image first; the correction is baked into the pixels.
• Crop to the page. Remove the desk, the shadow, and the scanner bed edge with the crop tool.
• Use A4 or Letter, matching the original paper size.
• Convert to grayscale for text documents with the grayscale tool. Colour adds file size and nothing else when the original is black ink on white paper.

One honest limitation: this produces a PDF containing images of text, not searchable text. There is no OCR here, so the words cannot be selected, searched, or copied. For a contract that needs to be searchable, you need an OCR tool — MyPDFiles runs OCR in the browser the same privacy-first way, with nothing uploaded. For proof of a signature or a receipt, an image-based PDF is exactly right.

Before you send it

• Strip metadata from the source photos if the PDF is going to someone outside your organisation. Photos of documents taken at home carry GPS coordinates. See the metadata guide.
• Open the finished PDF and page through it. Check the order, the orientation, and that nothing important sits under a crop edge.
• Need to merge it with other PDFs, split it, or shrink it further? MyPDFiles does those in your browser too, so the document still never leaves your device.

Your files never leave your device

The PDF is assembled in your browser. That matters more here than for most tools, because the images people turn into PDFs are disproportionately sensitive: passports, bank statements, signed contracts, medical forms. None of it is uploaded, and there is no server-side copy.

Troubleshooting

• Pages are in the wrong order. Order follows the file list, and operating systems sort names in ways you may not expect — `photo10` often sorts before `photo2`. Rename with zero-padded numbers, or re-add the files in the order you want.
• The PDF is too large to email. Resize, then compress, then convert. See above.
• An image is rotated wrongly. It relied on an orientation flag rather than storing pixels the right way up. Rotate it before converting so the fix is in the pixels.
• Large white margins. You chose A4 or Letter with images of a different proportion. Switch to fit-to-image.
• Text in a screenshot looks soft. PNG input is re-encoded as JPEG. Keep screenshots larger, or accept some softening on fine text.