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SumatraPDF documentation
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Convert to PDF
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Available in pre-release 3.7
Convert to PDF turns a comic book, folder of images, or single image into a multi-page PDF. Each image becomes one page. This restores the pre–3.5 multi-page image → PDF workflow (issues #4118, #5532).
Command id: CmdConvertToPDF (see Commands).

When it is available #

The command appears only when the open document is an image collection:
Source Examples
Comic book archives .cbz, .cbr, .cbt, .cb7, .ora
Archives of images .zip, .rar, .7z, .tar that contain images
Image folder a directory of images opened as a multi-page document
Single image PNG, JPEG, WebP, JPEG XL, HEIC, AVIF, TIFF, GIF, and other image types
It is hidden for PDF, EPUB, DjVu, CHM, and other non-image documents. See Comics and manga for how to open comics and image folders.

In the application #

  1. Open a comic archive, image folder, or image.
  2. Start Convert to PDF… in any of these ways:
    • File → Convert to PDF…
    • Right-click the document → Document → Convert to PDF…
    • Command palette (Ctrl + k) → type “Convert to PDF”
  3. A dialog shows the source path and a suggested destination:
    • Default path is the same location and base name with a .pdf extension.
    • If that file already exists, the name is made unique (e.g. book.1.pdf).
    • Edit the path in the text field, or use … to browse.
  4. Click Convert to PDF. On success the new PDF is written and opened in SumatraPDF. On failure you get a short error dialog.
Press Esc or Cancel to close the dialog without converting.

How images are stored in the PDF #

SumatraPDF prefers to embed the original image bytes when PDF can use them directly:
Format Behavior
JPEG, PNG Embedded as-is (usually the most compact)
WebP, JPEG XL, HEIC, AVIF, TGA, and similar Decoded, encoded as PNG, then losslessly recompressed (zopfli) before embedding
If encode/embed fails Page is rendered into the PDF as a last resort
If every path fails for a page That page is skipped (conversion continues with the rest)
The PDF’s producer metadata is set to the current SumatraPDF version (e.g. SumatraPDF 3.7).
There is no quality / DPI slider in the dialog: JPEG and PNG keep their original data; other formats go through a lossless PNG path when possible, so the main size trade-off is whether the source was already JPEG/PNG versus a format that must be re-encoded.

Convert whole document vs one page #

Command Menu / context What it does
Convert to PDF… (CmdConvertToPDF) File menu; Document context menu; command palette All pages of the comic / folder / image → one multi-page PDF (this page)
Convert page to PDF (CmdConvertImageToPdf) Image context menu Current page only, via the image editor / save dialog
For a single open image file, Convert to PDF… and converting that one page produce a one-page PDF; prefer Convert to PDF… when you want the simple path-picker dialog without opening the image editor.

From the command line #

To convert images or other documents to PDF without the GUI dialog, use sumatrapdf-tool (installed next to SumatraPDF.exe after a normal install):
sumatrapdf-tool convert -o output.pdf input.png
sumatrapdf-tool convert -o book.pdf comic.cbz
More options: sumatrapdf-tool convert, Convert PNG to PDF.
The GUI command and sumatrapdf-tool convert are separate code paths; the dialog’s JPEG/PNG embed and optimized-PNG fallback are specific to Convert to PDF… in the app.
SumatraPDF documentation
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Convert to PDF
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