About JPG to PDF
Phones take photos as JPGs. Scanners save individual pages as JPGs. The screenshots app on your laptop saves PNGs. None of those formats are great when you need to send a document. Email clients show them as inline thumbnails, recipients have to download each one separately, and ten loose images look messy in a folder.
JPG to PDF rolls those images into a single PDF, one image per page, in the order you set. The result is a tidy document that opens like any other PDF and travels well over email, chat, or upload portals.
What you can drop in
JPG and JPEG are the obvious ones. PNG works too, including PNGs with transparency (the transparent areas get a white background in the PDF since PDF pages aren't transparent). WebP is supported, which matters if you're saving images from modern websites. GIF works for the first frame only.
There's no hard limit on how many images you can add; a few hundred high-resolution photos at once just take a while to process. For a typical receipt or scan batch, you'll never see that limit.
Layout choices
Each image becomes one page by default. Page size matches the image dimensions, which means a 4000 by 3000 pixel photo gives you a similarly proportioned PDF page. If you'd rather force a standard size, switch to A4 or Letter and the images get fitted to that page size with margins.
Image fit has two modes. Contain keeps the image at its original aspect ratio and adds white space around it to fill the page. Cover crops the image edges to fill the page completely. Most of the time Contain is what you want, especially for documents where every part of the image matters.
Orientation can be locked to portrait, landscape, or set to auto. Auto picks the orientation that fits each image best, which is useful for a mixed batch where some shots are wide and others are tall.
When you'd actually use it
Expense reports. A month of phone-scanned receipts goes from 47 separate JPGs to one tidy PDF, ready to attach to the report.
Sending design references to a client. Instead of zipping ten PNGs, you send one labelled PDF where each reference is on its own page.
Visa or government applications. Most embassy portals want a single PDF of your supporting documents, not a folder of images. Drop your scanned passport, photo, bank statement, and ticket into the tool and you've got the bundle they're asking for.
School projects. A scanned worksheet, a phone photo of a model, a screenshot of a graph. One PDF to upload to the assignment portal.
Tips for clean output
Crop your photos before you drop them in. The PDF preserves whatever's in the image, including the desk under the receipt or the floor under the page. A quick crop on the phone saves you a wider page than you need.
Rotate before you upload if the image is sideways. The PDF locks in the orientation of the source image, so a sideways photo gives you a sideways page. Most phone galleries have a one-tap rotate button.
For text-heavy scans, run them through the OCR tool after the conversion. JPG to PDF wraps your image as-is, which means the text inside is still an image. OCR adds a hidden text layer so you can search and copy.
Privacy
Images stay on your machine. The PDF is built in your browser. Useful when the images are private, like ID scans or signed forms, and you'd rather not hand them to a third party just to bundle them.