Images → PDF Multi-page Never Saved to Disk

JFIF to PDF Converter

Drop .jfif 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). The PDF opens in any reader, mail client or print shop, and goes through upload forms that ask for a PDF and turn a .jfif away. It is built in memory at api.mochify.app and wiped as soon as your download is ready.

How to convert JFIF to PDF

1

Add your images

Drop in .jfif files, or mix in JPG, PNG, WebP, AVIF, HEIC or JXL; each becomes one page, in the order you add them.

2

Pick a page size

Pages fit each image exactly by default, with no white border. Choose A4 or Letter if the PDF is headed for a printer. There is nothing else to set: this page does one job.

3

Download the PDF

One file, ready to send.

What is in the PDF

A JFIF is already a JPEG, and JPEG is what images inside a PDF are stored as. Each image is still decoded and re-encoded with jpegli at high quality as a baseline JPEG, the variant every PDF reader can show, then placed on its own page. Two things to know:

  • Pages come out the right way up. A photo that carries a rotation flag is turned upright before it goes on the page, so nothing arrives sideways.
  • Page size follows the image. Every pixel is kept, so by default a large photo makes a large page. Choose A4 or Letter for a document meant for paper.

The PDF carries the pictures only, with no metadata, so keep the originals if you need them.

When JFIF to PDF is the right move

Plenty of forms, portals and print shops ask for one PDF, and the .jfif extension that Windows gives to images saved from a browser is one they often refuse. A PDF holds a set of images as one file in a fixed order: scanned receipts, ID photos for an application, screenshots for a report, pages of a document you photographed. If you only need one image with an extension every upload box accepts, use JFIF to JPG instead.

Converting JFIF to PDF on Windows or Mac

For a single image, the tools already on your computer will do it:

  • Windows: open the JFIF in the Photos app or your browser, press Ctrl+P and choose Microsoft Print to PDF.
  • Mac: open the JFIF in Preview, then File, Print, and Save as PDF.

For a batch, a mix of formats, or a computer where you cannot install anything, drop the lot here and get one PDF in any browser.

Limits, bulk and automation

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.

Building a PDF from images is also available on the hosted MCP server and the REST API, through POST /v1/pdf; full reference in the API documentation. Through the API, Growth builds PDFs from up to 200 images. Every route builds the PDF 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 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" \
  -H "Authorization: Bearer $MOCHIFY_KEY" \
  -F "images=@page1.jfif" \
  -F "images=@page2.jfif" \
  -F "images=@page3.jfif" \
  --output pages.pdf

Add page=a4 or page=letter for a standard sheet. Building a PDF from images works on every plan, including Free.

Frequently asked questions

Is this JFIF to PDF converter free?
Yes. Without an account or on a free account, you can build a PDF from up to 3 images. A paid plan, or a $2 Day Pass with no signup, takes up to 20 images per PDF; the pricing page has the plans.

Do I need an account?
No. JFIF to PDF works without signing up, within the same free limits as any other conversion, and a PDF can hold up to 3 images. A free account gives you more conversions each month, not more pages per PDF; a paid plan or a Day Pass takes up to 20 images per PDF.

What is a JFIF file?
A JPEG. JFIF (JPEG File Interchange Format) is the layout most JPEG files have always used, and Windows often gives the .jfif extension to JPEGs saved from a browser. Only the extension differs from a .jpg; if you need a single image rather than a PDF, JFIF to JPG fixes the extension.

Why is my file saving as JFIF?
Windows keeps one registry value that maps image/jpeg to a file extension, and on many machines it reads .jfif. When a browser saves an image whose address has no extension, it asks Windows and gets .jfif. The picture is a normal JPEG. Our guide to what a JFIF file is explains the cause and the fix that stops it.

How many images can I combine?
Up to 20 per PDF on any paid plan, Growth included, and on a Day Pass. The free plan takes 3, with or without a free account. Each image becomes one page, in the order you add them.

Does converting JFIF to PDF reduce quality?
Slightly, and rarely visibly. Each image is decoded and re-encoded as a high-quality JPEG with jpegli before it goes on the page, rather than copied in byte for byte, so the pages look the same on screen and print cleanly but are a fresh encode. Keep the JFIF files if you need the exact originals.

Can I mix JFIF with other formats?
Yes. Add JPG, PNG, WebP, AVIF, HEIC or JXL files alongside your JFIF images; each becomes one page, in the order you add them.

What page size do I get?
Each page fits its image exactly by default, with no border. Choose A4 or Letter after adding your files if you are going to print.

What happens to my files?
They are sent to api.mochify.app, the PDF is built in memory, and the images are discarded once the PDF is returned. Nothing is written to disk, no logs contain your data, and your files are never used to train AI.

Also available

JFIF to JPG →

Standard .jpg files every upload box accepts

JFIF to PNG →

Lossless PNGs for apps and forms that ask for PNG

HEIC and HEIF to PDF →

Bundle iPhone photos into a single multi-page PDF

WebP to PDF →

Combine WebP images into a single multi-page PDF