Add images to combine into a single PDF — the PDF is built locally in your browser and nothing is uploaded.
How it works
- Drag any thumbnail to reorder, or use ↑ / ↓ — pages follow the order shown. Quick sort by filename handles bulk ordering (useful for scanned page-001.jpg, page-002.jpg…).
- Page size: "Fit to each image" makes every page exactly the image's dimensions (no whitespace). Choosing A4/Letter/etc. places each image centered on a standard page — better for printing.
- On standard page sizes you can set a margin and background color, and choose orientation or let it match each image automatically.
- Images are scaled proportionally to fit — they're never stretched or distorted.
- A short ad plays before your download starts — it helps keep this tool free.
- All processing happens locally in your browser using pdf-lib — your files are never uploaded anywhere.
Before you create the PDF
Turning images into a PDF is straightforward, but the quality of the final document depends mostly on the images and page settings you start with.
For a multi-page document, put the images in the order they should be read before exporting. A perfectly generated PDF is still wrong if page 8 comes before page 3.
Choose the destination page size deliberately. A4 is a common choice for general documents, while Letter may be more appropriate when the recipient works with that paper size. Portrait works well for normal document pages; landscape may be better for wide tables, screenshots or other horizontal material.
Pay attention to aspect ratio. The source image and destination page do not always have matching proportions, so the image may need to be fitted inside margins. Inspect the result rather than assuming the placement is correct.
Large source images can also consume substantial browser memory. If you are converting many high-resolution photographs at once, splitting the job into smaller batches may be more practical on a phone or lower-memory device.
The biggest conceptual limitation is that an image-based PDF is still made from images. Converting a photograph of a page into PDF does not automatically create searchable text. If you need copyable or searchable text, you need an OCR workflow after or instead of the image-to-PDF conversion.
Frequently asked questions
Which image formats work?
The tool is designed around common browser-readable image formats such as JPG and PNG. Very large images can still consume substantial memory while the PDF is being built, especially on phones.
Can I choose A4 or Letter?
Yes. Choose the page size, orientation and margins before generating the PDF. The image is fitted to the page instead of simply being placed at its raw pixel dimensions.
Will converting an image to PDF reduce quality?
The result depends on the source image and the PDF encoding. Starting with a compressed JPEG does not restore detail that was already lost in the source. For printed documents, use a sufficiently large source image and inspect the exported PDF before sending it.
Are my images uploaded?
The conversion runs in your browser. The selected images are processed locally rather than uploaded to an AllDays conversion server.
How images become pages
Each image you add becomes a page in the PDF, in the order you arrange them. A folder of photos or scanned pages turns into a single document you can share or print as one file, instead of many separate image files.
Dimensions, page size, and orientation
An image's pixel dimensions (width by height) decide its shape. The tool fits each image onto a page, and the page size and orientation determine how much of the sheet the image fills. A wide photo naturally suits a landscape page; a tall one suits portrait.
Image quality and file size
The clarity of each page depends on the source image — a low-resolution photo won't gain detail by being placed in a PDF. And because photos carry a lot of data, a PDF built from many high-resolution images can become large. That's the same reason scanned documents are often bigger than text ones: images are heavy.
A practical example
Photograph the four pages of a paper form, add the images in order, and you get a single four-page PDF — far easier to email than four separate photos.
Why image collections become PDFs
A folder of images has no universal page order or paper size. Putting them into a PDF turns independent pictures into a page-oriented document with a defined sequence.
Pixels and paper are different measurements
An image is naturally measured in pixels, while a PDF page has physical dimensions. Converting images to pages requires deciding how pixel dimensions fit onto a chosen page size.