Why merge images into a PDF?
PDF is the most universally accepted format for multi-page documents. Merging your JPGs or PNGs into a single PDF makes it easier to email, archive, or share a set of images as a coherent document — without a ZIP file or folder. A PDF also preserves the order and layout of the pages.
How local image merging works
A local image-to-PDF tool embeds each image as a full page in a new PDF document on your device. Operating systems do this through their print-to-PDF feature; browser-based local tools use JavaScript PDF libraries such as pdf-lib. No data needs to be transmitted to any server. MiniFiles' Merge tab uses pdf-lib: each image becomes one page sized to the image (the longest side is scaled to at most A4 height), embedded at full resolution with its EXIF orientation applied, so photos taken on a phone appear the right way up.
Step-by-step: merge JPG or PNG images into a PDF
With MiniFiles: 1. Open minifiles.io and select the Merge tab. 2. Drag and drop your images onto the upload zone. 3. Put them in order — drag the files, or switch to the page view to drag, rotate or delete individual pages. 4. Click the button to build the PDF. 5. Download merged.pdf (a single image is saved as <image name>.pdf). The images never leave your device. Built-in alternatives: on macOS, open the images together in Preview, drag the sidebar thumbnails into order, then choose File → Print → Save as PDF; on Windows, select the images in File Explorer, right-click → Print, pick 'Microsoft Print to PDF' and save; on iPhone, select the photos in Photos, tap Share → Print, pinch out on the preview and save the PDF to Files.
Supported image formats
MiniFiles' Merge tab accepts JPG (JPEG), PNG, WebP and GIF. You can mix formats in a single merge — for example, combine a PNG cover page with several JPG photographs. PNG and GIF images keep their transparency; JPEG and WebP images are re-encoded as JPEG at 92% quality on a white background. An animated GIF contributes only its first frame. HEIC photos from iPhones are not supported — convert them to JPEG first (for example with Preview or the Photos app).
Can I also merge PDFs and images together?
Yes, in one step. Drop your PDFs and your images onto MiniFiles' Merge tab together. Each image becomes a page and each PDF keeps its own pages; arrange the files or individual pages in the order you want and build a single PDF — locally, without uploading anything.
How does this compare to online image merge tools?
Most online tools — iLovePDF, Smallpdf, Adobe online tools — require you to upload your images to a remote server. This is a privacy concern for sensitive scans such as ID documents, contracts, or medical forms. MiniFiles and built-in print-to-PDF tools never upload your files, so your images stay on your device from start to finish.
Is there a limit on the number of images?
MiniFiles sets no file size limit and no fixed image count (guests get 10 uses a day, and each merge counts as one use; a free account removes the limit). Practical limits are set by your device's available memory (RAM). Most modern desktops handle 50–100 high-resolution images without issue. On mobile devices with limited RAM, working with very large files (e.g. 20 MB+ JPGs) may be slower. For large batches, consider compressing the images first with MiniFiles to reduce memory usage and the size of the final PDF.