Why convert images to PDF?
A PDF bundles multiple images into a single, universally readable file. Where sending ten photos as individual attachments risks getting lost, scrambled, or rejected by an email size limit, a PDF lands as one tidy document that opens on any device — Windows, Mac, iPhone, Android — without requiring any special software. PDFs also preserve page order, so the recipient sees your images in exactly the sequence you intended.
Common reasons to merge images into a PDF include submitting scanned documents (ID, receipts, forms), compiling a photo report or inspection log, packaging design mockups for a client, creating a simple photo book, or attaching multiple screenshots to a bug report. A PDF is also the expected format for printing at a copy shop or uploading to document portals that reject loose image files.
How to convert images to PDF online
- Upload your images — drag JPG, PNG, or WEBP files onto the upload zone, or click to browse. You can add up to 30 images at once and mix formats freely.
- Set the page order — images appear in the order you added them, with a page number on the left. Use the up and down arrows to reorder them until the sequence is correct.
- Choose a page size — A4 (the global standard), US Letter (North America), or Fit to image (page matches each image exactly). For A4 and Letter you can also choose portrait or landscape orientation.
- Click Convert — the PDF is generated inside your browser using the Canvas API and jsPDF. No data leaves your device.
- Download the PDF — a Download button appears when conversion is complete. Click it to save the file.
A4 vs US Letter vs Fit to image
Choosing the right page size depends on how the PDF will be used:
| Page size | Dimensions | Best for |
|---|---|---|
| A4 portrait | 210 × 297 mm | Europe, Australia, international documents, printing at most print shops |
| A4 landscape | 297 × 210 mm | Wide panoramas, slides, landscape photos on A4 paper |
| US Letter portrait | 8.5 × 11 in | North American offices, US printers, government forms |
| Fit to image | Matches each image | Digital-only PDFs, e-portfolios, cases where print size does not matter |
For A4 and Letter, each image is scaled to fill as much of the page as possible while keeping its original aspect ratio, with a small margin on all sides. A portrait photo will fill the height of an A4 page; a landscape photo will fill the width. No cropping occurs.
Converting photos to PDF on Windows and Mac
Both Windows and macOS have built-in ways to convert images to PDF, but they have limitations. Windows' Print to PDF function handles one image at a time and gives little control over margins or page size. The macOS Preview app can combine images into a PDF but requires specific steps to avoid creating a multi-page TIFF instead. Browser-based tools like this one skip the friction: drop your files in, set the order and page size, and download — without opening multiple apps or navigating print dialogs.
For iPhone users, the Photos app can share images as a PDF through the print preview trick (tap Share → Print → pinch out on the preview to open as PDF), but this is limited to one photo and produces a fixed US Letter size. If you have HEIC photos from your iPhone, run them through the HEIC to JPG converter first, then add the JPGs here.
Batch converting images to PDF
This tool supports up to 30 images per PDF. For larger collections, batch in groups: add 30 images, convert to PDF, download, clear, then add the next 30. If you later need to merge those PDFs into one, any PDF editor (Adobe Acrobat, Preview on Mac, or free online tools) can combine them.
Before converting, consider whether you need to resize or compress your images first. Very high-resolution source photos (e.g., 12 MP camera shots) will produce large PDF files. Use the Image Resizer to reduce dimensions to a print-appropriate size (e.g., 1800 × 1200 px for A4 at 150 dpi), or the Image Compressor to reduce JPEG quality before adding them to the PDF.
Image formats: JPG, PNG, and WEBP in PDFs
All three formats are supported. JPG is the most common for photos: it compresses well and embeds efficiently. PNG is better for screenshots, diagrams, and graphics with text or solid-color regions — its lossless encoding keeps edges sharp. WEBP is a newer format used by websites and Android screenshots; it is supported here even though most PDF viewers do not natively understand WEBP, because the tool converts it to JPEG internally before embedding.
Transparent PNGs (logos, icons with alpha channel) have their transparent areas filled with a white background before embedding, since PDF does not support JPEG transparency. If preserving transparency in the PDF matters to you, use a vector format (SVG, EPS) or a dedicated PDF editor.
How PDF image quality works
The quality of a PDF image depends on the resolution of the source file, not on the PDF format itself. A 300 dpi photo will look crisp when printed; a 72 dpi web-resolution image will look pixelated at the same print size. This tool embeds images at 92% JPEG quality, which is imperceptible at normal viewing or printing sizes. The key variable is always the input: start with the highest-resolution source you have for printed PDFs.
For screen-only PDFs (emailed documents, e-portfolios), 96 dpi is sufficient and produces much smaller files. For print at A4 or Letter size, aim for source images of at least 1240 × 1754 px (A4 at 150 dpi) or ideally 2480 × 3508 px (A4 at 300 dpi).
Privacy
Your images never leave your device. PDF generation runs entirely in your browser using the Canvas API to decode images and jsPDF to build the document. There is no upload step, no temporary server file, and no log. The generated PDF is held in browser memory until you download it and is released when you close the tab.