JPG to PDF Converter — Free, Online & Private
Convert JPG, PNG, and WebP images into a single PDF document — instantly, in your browser, with no upload required. Add multiple images, drag to reorder them, choose your page size (A4, Letter, A3, or fit-to-image), set orientation and margins, then download a clean PDF in seconds. Your images stay on your device from start to finish.
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How to Convert JPG to PDF
Alfreto's JPG to PDF converter runs entirely in your browser using jsPDF — an open-source JavaScript library that builds PDF documents client-side. Your images are never uploaded to any server. The entire process — from reading image files to generating the PDF — happens on your own device.
Step 1 — Add Your Images
Click Choose Images or drag and drop one or more image files into the drop zone. Supported formats are JPG/JPEG, PNG, and WebP. You can add as many images as you like — each image will become one page in the final PDF. There is no file size limit since processing is done locally.
Step 2 — Reorder If Needed
Images appear in the list in the order they were added. To change the page order, drag and drop image rows to the correct position, or use the ↑ ↓ arrow buttons on each item. The preview panel on the right updates automatically to reflect the current order.
Step 3 — Configure PDF Options
Four options control how images are laid out in the PDF:
- Page Size — Choose A4 (standard international), Letter (US standard), A3 (double A4, good for large photos), or Fit to image (each page is exactly the image's pixel dimensions). Use Fit to image when you want the PDF to show images at their natural size with no white border.
- Orientation — Portrait (taller than wide), Landscape (wider than tall), or Auto which automatically switches orientation per page based on whether each image is taller or wider. Auto is the most practical choice when your images have mixed orientations.
- Image Fit — Contain scales the image to fit entirely within the page while preserving its aspect ratio (no cropping). Fill scales the image to cover the entire page, which may crop the edges. Center places the image at its actual pixel size, centered on the page — useful for small images you do not want stretched.
- Margin — Adds white space around the image: None (0mm, image touches the edge), Small (10mm), Normal (20mm), or Wide (30mm). Margins are especially useful when printing the PDF.
Step 4 — Convert and Download
Click Convert to PDF. A progress bar tracks the conversion page by page. When complete, click Download .pdf to save the file. The downloaded PDF filename is based on the first image's name, plus a count of additional pages if multiple images were used.
When Should You Convert Images to PDF?
- Submitting scanned documents — Government portals, banks, and academic institutions often require PDFs rather than loose image files.
- Combining multiple photos into one file — Send a set of photos as a single PDF instead of a folder of images attached to an email.
- Creating a photo portfolio — Compile a selection of JPG photos into a professional-looking PDF document.
- Archiving receipts or screenshots — Merge several receipt photos or UI screenshots into one organized PDF for record-keeping.
- Sharing ID or certificate scans — Convert a scanned ID, certificate, or diploma photo to PDF format as required by many online forms.
- Preparing documents for printing — A PDF with A4 or Letter page size and proper margins is the most reliable format to send to a printer.
Frequently Asked Questions
Is my image uploaded to a server?
No — your images never leave your device. The conversion runs entirely in your browser using jsPDF, an open-source JavaScript PDF library. Images are read by the browser's FileReader API, processed into PDF pages using the Canvas API, and the resulting PDF is generated client-side. No data is transmitted over the internet at any point.
What image formats are supported?
JPG/JPEG, PNG, and WebP are fully supported. All three formats are embedded directly into the PDF at their original resolution. If you have images in other formats (HEIC, TIFF, BMP), convert them to JPG or PNG first using the Image Converter tool before using this tool.
Can I combine multiple images into one PDF?
Yes. There is no limit to how many images you can add. Each image becomes one page in the final PDF, in the order shown in the list. You can reorder pages by dragging items in the list or using the ↑ ↓ buttons. This makes it easy to build multi-page documents from a collection of photos or scans.
Will the image quality be reduced?
No. Images are embedded into the PDF at their original resolution using jsPDF's FAST compression mode, which preserves visual quality while keeping file sizes manageable. The PDF output is visually identical to the source images at normal viewing sizes. If you need the absolute smallest file size, consider compressing the images before converting.
What does "Fit to image" page size mean?
Instead of fitting your image onto a standard paper size (A4, Letter), the Fit to image option creates a PDF page that is exactly the same dimensions as the image itself — measured in millimeters based on 96 DPI. This is useful when you want a PDF where the image fills the entire page with no white borders, or when the exact pixel dimensions of the image are important.
What is the difference between Contain, Fill, and Center image fit?
Contain scales the image to fit entirely within the usable page area (inside the margins) while preserving its aspect ratio. The image will never be cropped, but there may be white space on two sides if the image proportions differ from the page. Fill scales the image to cover the entire usable area, which may crop the image on two sides. Center places the image at its actual pixel size (converted to mm) in the center of the page — useful for small images you do not want to scale up.
Should I use Portrait, Landscape, or Auto orientation?
Use Portrait for vertical (taller) images or standard document layouts. Use Landscape for horizontal (wider) images or panoramic photos. Use Auto when your images have mixed orientations — the tool will automatically set each page to Portrait or Landscape based on whether that image is taller or wider. Auto is the most convenient setting for multi-image PDFs from a camera or phone.
Is there a file size or image count limit?
There is no server-imposed limit on either file size or the number of images since everything runs locally on your device. In practice, adding very large numbers of high-resolution images (e.g., 50+ photos at full camera resolution) may slow processing on older devices. For best performance on large batches, reduce image resolution before converting, or process in smaller groups.
Which browsers are supported?
The tool works in all modern browsers: Google Chrome, Microsoft Edge, Mozilla Firefox, and Safari. No plugins or extensions are required. For the best experience, use a recent version of Chrome or Edge on a desktop or laptop computer.
Can I use this on my phone?
Yes. The tool works in mobile browsers on iOS (Safari) and Android (Chrome). You can select images from your camera roll or downloads folder and convert them to PDF directly on your phone — no app download needed. For large batches or high-resolution photos, a desktop browser is faster due to more available memory.
Why Use Alfreto to Convert JPG to PDF?
Most online JPG to PDF converters upload your images to a remote server, which introduces privacy risks, upload time, and file size restrictions. Alfreto works differently — the entire PDF is built inside your browser, using your device's own processing power, with no server involvement at any stage.