About the Images to PDF Converter
This images to PDF converter combines photos, scans and screenshots into a single PDF, one image per page. Add JPG, PNG, WebP or GIF files, drag them into the right order with the arrow buttons, choose a page size (A4, US Letter, Legal, A3, A5 or a page that exactly fits each image), orientation, margin and fit mode, and download the PDF. It is ideal for sending receipts to an accounts team, submitting scanned ID or forms, or turning phone photos of a document into one file.
Everything happens in your browser: images are decoded, drawn onto a canvas with a white background (so transparent PNGs print cleanly), compressed as JPEG at the quality you choose and written into a standards-compliant PDF. Nothing is uploaded, so private documents stay on your device. Phone photos are rotated using their EXIF orientation automatically.
The calculator below the converter shows how an image will sit on the page — its printed size and effective resolution in DPI — so you can tell before printing whether a photo is sharp enough for its page size.
With the default inputs, the effective print resolution is 404 DPI. Change any value above to recalculate instantly.
How to use the images to pdf converter
- 1Click Add images (or drop files) and select JPG, PNG, WebP or GIF images.
- 2Put them in order with the arrow buttons and remove any you do not need.
- 3Choose page size, orientation, margin, fit mode and JPEG quality.
- 4Click Create PDF and save the downloaded file.
- 5Use the calculator to check print resolution for a given image size.
Formula and method
Page sizes are in PDF points (1 pt = 1/72 inch; A4 is 595.28 × 841.89 pt). The image’s natural size is taken as 96 pixels per inch. In “fit whole image” mode it is scaled by the smaller of the two ratios between the printable box (page minus margins) and the image, so the whole picture is visible and centred; “fill” uses the larger ratio and crops the overflow; “actual size” keeps 96 px/in unless the image would not fit.
Auto orientation turns the page landscape for images wider than they are tall. Effective resolution is the image width in pixels divided by its printed width in inches — around 300 DPI looks sharp in print, 150 DPI is the usual minimum. The converter re-encodes each image as JPEG at the chosen quality, which keeps PDFs small for photos.
- m
- Margin on each side
- imgW, imgH
- Image size at 96 px per inch
- pageW, pageH
- Page size in points
Worked examples
12 MP phone photo on A4
A 3024 × 4032 portrait photo on A4 with 10 mm margins is limited by the width: 190 mm (7.48 in) of printable width gives 3024 ÷ 7.48 ≈ 404 DPI — excellent quality — and the image is 253.3 mm tall.
Landscape screenshot on US Letter
Auto orientation turns the Letter page landscape (11 × 8.5 in). With half-inch margins the printable width is 10 in, so 1920 px prints at 192 DPI and the image is 254 × 142.9 mm.
Small image, page fitted to it
With “fit page to image” the page is made exactly the image size at 96 px per inch: 800 px ÷ 96 = 8.33 in = 211.7 mm wide, and the image covers 100% of the page.
Frequently asked questions
Are my images uploaded to a server?+
No. The images are read, resized and written into the PDF by JavaScript in your browser. Nothing is sent over the network, so you can safely convert IDs, contracts and medical paperwork.
How do I keep the PDF file small?+
Lower the JPEG quality to 70–80% — the difference is rarely visible for photos — and pick a page size close to how the PDF will be used. Very large phone photos are also capped at 5,000 px on the longest side.
Can I convert PNG screenshots with transparency?+
Yes. Transparent areas are filled with white, because JPEG has no transparency and white matches paper. Text in screenshots stays readable at 85% quality or higher.
What DPI do I need for printing?+
About 300 DPI at the printed size looks sharp up close; 200 DPI is fine for most documents; below 150 DPI pixels may become visible. The calculator shows the DPI your image will have on the chosen page.
Can I put several images on one page?+
This converter places one image per page, which suits scans, receipts and photos. To fit several on a page, combine them into one image first or use a layout tool, then convert.