Drop JPEG XL images here and get one PDF back, a page per image in the order you added them, up to 20 files at a time on a paid plan or Day Pass (3 on the free plan). Each image is stored in the PDF as a standard JPEG, so the document opens in any PDF reader, mail client or print shop, including the many that cannot open a .jxl file at all. The PDF is built in memory at api.mochify.app and wiped as soon as your download is ready.
Drop in JXL files, or mix in PNG, JPG, WebP, AVIF and HEIC; each becomes one page, in the order you add them.
There is almost nothing to set: this page does one job, images to a single PDF. Pages fit each image exactly by default; choose A4 or Letter if the PDF is headed for a printer.
One file, ready to send.
PDF readers cannot display JPEG XL data yet, so this page does not embed your .jxl files as they are. Each image is decoded and re-encoded as a baseline JPEG at high quality, then placed on its own page. That is a lossy step: the pages look the same on screen and print cleanly, but they are not the original JXL pixels, and features JPEG cannot hold, such as an alpha channel or more than 8 bits per channel, are not carried into the PDF. If you need the JXL files themselves preserved, send them alongside the PDF; the PDF is the version everyone can open. Our jpegli guide explains why a modern JPEG encode holds up so well, and What is a JXL file? covers the format the pages started as.
Outside a current browser (Chrome 155, Firefox 158, Safari) almost nothing opens a .jxl file: mail clients, print shops, document tools and most operating-system viewers will not. Wrapping a set of JXL images in a PDF gives them universal reach in one file that keeps its page order. Typical uses: sending JXL exports from a photo tool to a client, a portable single-file version of an image set, proofs for a printer, screenshots or UI captures bundled into one document, and anything a recipient cannot open as JXL. Prefer a JPEG per image instead of a document? Convert back with the CLI or API, described below.
Your first PDF needs no account. Without an account or on a free account, a PDF can hold up to 3 images; every paid plan, Growth included, and the Day Pass take up to 20 images per PDF on this page. The same in-memory model applies to the CLI (mochify, sign in once with mochify auth login), the hosted and local MCP servers and the REST API, which also handle PDF work through POST /v1/pdf; full reference in the API documentation. Every route converts at api.mochify.app in memory, keeps nothing on disk and writes no logs containing your data.
To build the same PDF from a script, send the images to the PDF endpoint with op=create; each image becomes one page, in the order you send them:
curl -X POST "https://api.mochify.app/v1/pdf?op=create&page=a4" \
-H "Authorization: Bearer $MOCHIFY_KEY" \
-F "images=@photo1.jxl" \
-F "images=@photo2.jxl" \
-F "images=@photo3.jxl" \
--output photos.pdfLeave out page=a4 to fit each page to its image, or use page=letter. Building a PDF from images works on every plan, including Free.
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