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Images to PDF

How to convert a mix of image formats into one PDF

By DeckleUpdated

To convert a mix of JPG, PNG, HEIC and TIFF images into one PDF, convert each format with its own Deckle tool, then join the PDFs in Merge PDFs. For example, run the photos through JPG to PDF and the screenshots through PNG to PDF, then merge the two PDFs and choose Merge PDFs. Your images are not changed.

JPG to PDF

Mixed sources take separate import routes

JPG, PNG, HEIC, TIFF

Use each matching image-to-PDF tool

Resulting PDFs

Merge them, then check the final page order

Check TIFF frames as well as file count

Conceptual workflow · Deckle's image import tools accept their own supported formats; a mixed set is not one universal upload.

How to convert mixed image formats with Deckle

  1. Sort the images into groups by file extension: .jpg/.jpeg, .png, .heic/.heif and .tif/.tiff.
  2. Open the tool for the first group, for example JPG to PDF, and choose Select files, or drop that group onto the page.
  3. Put the images in order with the up and down arrows, and choose the same Page size you will use for every group.
  4. Choose Create PDF and download the PDF. Give it a clear name in Output PDF name, such as part-jpg.
  5. Repeat for each remaining group with PNG to PDF, HEIC to PDF or TIFF to PDF.
  6. Open Merge PDFs, choose Select files and add every part. Put the parts in order and choose Merge PDFs.
  7. If pages from different groups need to interleave, open the merged PDF in Organize PDF pages, drag pages into place and choose Save pages.

The merge result screen says how many pages were combined and from how many files, so you can check the total against the number of images.

Why each format has its own tool

Each image tool accepts only its own format. If a PNG is in the JPG to PDF list, the Create PDF button stays disabled with "use the matching format-specific tool" and the name of the file to untick.

The split exists because the formats travel into the PDF differently:

Format What happens
JPG Copied into the PDF unchanged, including its EXIF data; a photo over the pixel limit is scaled and re-saved without it
PNG Stored losslessly, transparency kept
HEIC Decoded, saved as quality-90 JPEG, metadata dropped
TIFF Every frame decoded and saved as quality-90 JPEG

WebP, GIF, BMP and AVIF files are not supported by any of the four tools. Open them in an image editor and save them as PNG (for graphics) or JPG (for photos), then add them to the matching group.

Plan the order before you convert

When groups are converted separately, the order of the finished PDF comes from two places: the order inside each run, and the order of the parts in Merge PDFs. Write the final page order down first, then decide how to split it.

Example: an insurance claim with eight images.

  1. Claim letter, scanned as a TIFF
  2. Four photos of the damage from an iPhone, as HEIC
  3. Two screenshots of the online order, as PNG
  4. A JPG of the receipt

That is four runs and one merge, in the same order. Nothing needs interleaving, so Organize PDF pages is not needed.

If the photos and screenshots alternate, it is quicker to convert each group once, merge, and then fix the order in Organize PDF pages than to make many small runs.

Keep the pages consistent

Each run has its own page settings, and Merge PDFs keeps every page exactly as it is. If one part uses Match each image and another uses Fit inside A4, the merged PDF mixes huge and A4 pages. Pick one setting for every run:

  • Fit inside A4 for documents that will be printed, attached or read as a document. Use the same orientation and margin each time.
  • Match each image for screen reading, where each page simply fits its image.

A multipage TIFF adds one page per frame, so a three-frame TIFF and two photos give five pages.

Tips

  • Name each part by its position. 1-letter.pdf, 2-photos.pdf, 3-screens.pdf make the merge order obvious.
  • Convert large photos on a computer. iPhone and iPad scale photos down to 4 megapixels per page and refuse photos above 25 megapixels; computers and Android devices keep up to 16 megapixels and accept up to 64.
  • Check transparency. PNG transparency survives; HEIC and TIFF transparency becomes white.
  • Keep the parts until you have checked the merge. If the order is wrong, re-merging is quicker than converting again.

Other ways to combine mixed images

  • Finder on a Mac. Select files of different types in the order you want, Control-click and choose Quick Actions > Create PDF. Apple documents this in Combine files into a PDF on Mac. Apple says the PDF gets a name similar to the first file you selected.
  • Convert everything to one format first. Export all the images as JPG or PNG from a photo app, then run a single conversion. This adds a lossy step for photos saved again as JPG.

Frequently asked questions

Can I convert JPG and PNG in one run?

No. Each tool takes its own format. Convert the JPGs and PNGs separately and join them in Merge PDFs.

Why is WebP not accepted?

The PDF engine embeds JPEG and PNG directly and decodes HEIC and TIFF. WebP is not among them, so save it as PNG or JPG first.

Will merging re-compress the images?

No. Merge PDFs joins the pages as they are, so each image keeps the quality it had after its conversion.

How do I put pages from different formats in between each other?

Merge the parts, then open the result in Organize PDF pages and drag pages into the order you want. See how to reorder pages in a PDF.

Related tools

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