Need to combine a stack of photos, scanned pages, or screenshots into a single organized PDF document? BuildPDF makes this effortless — just select all your images at once, order them, and convert. Each image becomes one page in the final PDF.
This works with JPG, PNG, WEBP, GIF, and BMP files — and it's completely free, with no watermarks and no file uploads.
Open buildpdf.co — works on any device with a modern browser.
Click "Choose Files" and select multiple images at once (hold Ctrl or Cmd to multi-select), or drag and drop a batch of images onto the drop zone together. You can mix JPG, PNG, WEBP, and other formats freely.
The files will appear in a list. They will be converted in the order shown — which is typically the order you selected them. Make sure the order matches the page order you want in the final PDF.
Choose page size and orientation. For portrait photos, use Portrait. For landscape/widescreen images, use Landscape. Set Image Quality to High for best results.
All images are merged into a single multi-page PDF and generated in your browser. Download it instantly.
001_page.jpg, 002_page.jpg, 003_page.jpg. When you select them all, they'll be ordered numerically.
If all your images are the same orientation and aspect ratio, choose the page size that matches best. For photos taken on a smartphone (portrait), A4 Portrait works well. For landscape photos, A4 Landscape or Letter Landscape fills more of the page.
For photo PDFs or portfolios, None (0mm) margin gives a full-bleed edge-to-edge look. For document scans that should look like real pages, use Normal (10mm) margins for a more professional appearance.
Currently, BuildPDF applies a single orientation setting to all pages. If you're merging a mix of portrait and landscape images, choose the orientation that fits the majority of your images. For professional mixed-orientation work, a desktop tool like Adobe Acrobat gives more per-page control.
There's no hard limit set by BuildPDF — you can merge as many images as your browser can handle in memory. In practice, merging 50–200 images works well in most modern browsers on a standard laptop. Very large batches (500+ high-resolution images) may be slow or may exhaust browser memory; for those, consider splitting into two conversions.
The single most common frustration with image-to-PDF merging is page order. When you select multiple files in a browser file picker, the order in which they appear in BuildPDF's list depends on how your operating system sorts them — typically alphabetical or numerical order by filename. This is predictable once you know it, and you can exploit it.
The most reliable method is the numeric prefix rename strategy. Before selecting your files, rename them so the first part of each filename is a zero-padded number: 001_receipt.jpg, 002_receipt.jpg, 003_receipt.jpg. The zero-padding is important: without it, 10_page.jpg will sort before 2_page.jpg in most systems. With zero-padding (010_page.jpg vs 002_page.jpg), numerical sort order is guaranteed.
On Windows, you can batch-rename files in File Explorer by selecting them all, pressing F2, and typing a name — Windows will append (1), (2), etc. automatically. On macOS, select files in Finder, right-click, and use "Rename X Items" to apply a sequential prefix. Both methods are quick and give you full control over page order before you ever open BuildPDF.
Real-world image batches are often mixed: some photos are portrait, some are landscape, some are square. BuildPDF applies a single orientation setting to all pages in the output PDF. Here are three strategies to handle this well:
For truly professional mixed-orientation PDFs where each page needs its own orientation setting, Adobe Acrobat or Canva Pro is the right choice. BuildPDF excels at batches where one orientation fits all.
When merging many images, the quality setting in BuildPDF determines the JPEG compression applied to each image before it's embedded in the PDF. This has a direct and significant impact on file size.
To put numbers on it: a batch of 20 smartphone photos at 12 MP each, merged at High (95%) quality, might produce a PDF of 150–300 MB. The same batch at Medium (80%) might be 30–60 MB — still excellent quality for screen viewing. At Low (60%), you might get 10–20 MB, acceptable for quick sharing but visibly softer on close inspection.
A useful rule: match quality to purpose. Archiving or printing → High (95%). Email or sharing via messaging apps → Medium (80%). Quick preview or draft → Low (60%). Don't default to High if the PDF will only ever be viewed on screens — you're creating unnecessarily large files that are slow to open and share.
Yes, absolutely. BuildPDF handles any mix of supported image formats (JPG, PNG, WEBP, GIF, BMP) in a single conversion run. Each image is processed individually before being embedded into the PDF, so format differences don't cause any issues. The page order in the PDF follows the order of files as they appear in BuildPDF's file list, regardless of their format.
It depends on your device's RAM and the number of files. A modern laptop with 8–16 GB RAM handles batches of 50–100 high-resolution phone photos (12–24 MP each) without trouble. If the browser tab becomes slow or unresponsive, try reducing the batch size — do two runs of 50 images and merge the resulting PDFs. Alternatively, shrink the source images using a batch resizer before merging; reducing phone photos from 12 MP to 4 MP makes them perfectly adequate for screen viewing while dramatically reducing processing demands.
BuildPDF's current interface does not support drag-to-reorder after selection. The page order is determined by the file selection order. The most reliable approach is to rename files with numeric prefixes before selecting them, as described above. If you've already converted and the order is wrong, it's faster to rename the source files and re-run the conversion than to try to reorder pages in a third-party PDF editor.
JPEG files often contain orientation metadata in their EXIF data — a flag telling image viewers how to rotate the photo. Some systems respect this flag automatically; others don't. If your photos appear sideways in the PDF, the EXIF rotation isn't being applied. Fix: open the affected images in your OS's built-in photo viewer, rotate them visually (not just a metadata change — actually re-save the rotated version), and then re-run the conversion. Windows Photos and macOS Preview both do this correctly.
Large PDFs from image merges almost always trace back to high-resolution source images combined with a High quality setting. Lower the quality to Medium (80%) — for most use cases, the visual difference is negligible. Also check whether your source images are unnecessarily large; scaling them to 50% with an image editor before merging typically reduces PDF size by 75% or more with minimal visible quality loss on screen.
This happens when the image's aspect ratio doesn't match the chosen page size, and BuildPDF scales the image to fit while preserving aspect ratio. To minimise white space: (1) set margins to None (0mm), (2) choose the orientation that best matches most of your images, and (3) if one image format is dominant (e.g., all are 4:3 ratio), find a standard page size closest to that ratio. Perfect full-bleed on a standard paper size requires images that match those proportions exactly.
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