Convert Images to PDF Securely (100% Offline)
Merge multiple images into a single PDF instantly. No uploads required, entirely offline and secure.
Drag & Drop your JPG or PNG files here
or click to browse files
Selected Images (0)
The order below will be the order in the final PDF.
Related PDF Tools
How do I securely convert sensitive images to PDF?
When dealing with highly sensitive documents—such as passport scans, financial receipts, medical records, or confidential design portfolios—uploading your files to traditional online "Image to PDF" converters poses a massive privacy risk. Once your file hits a remote server, you lose control over who sees it, how long it's stored, and if it's used for AI training.
The Solution: Zero-Knowledge Architecture.
Our tool is engineered with a strict client-side-only approach. When you drag your images into the browser, the underlying JavaScript engine (powered by pdf-lib) reads your files locally, maps them into a PDF structure within your device's memory, and forces a secure local download. Premise: Your files cannot be intercepted. Evidence: You can disconnect from Wi-Fi immediately after the page loads and the conversion will still work flawlessly. Conclusion: This is the absolute safest way to convert JPGs and PNGs to PDF without installing desktop software.
Step-by-Step Guide: How to merge JPG to PDF offline
Import Images
Drag and drop your JPG or PNG files into the secure drop zone above. You can also click the box to open your file browser.
Configure Layout
Rearrange the thumbnails to set the document order. Choose a page size (A4, US Letter) or leave it as "Fit to Image".
Export Document
Click "Merge into PDF". The tool will instantly compile and trigger a secure download directly to your local drive.
Top Use Cases for an Image to PDF Converter
- Expense Reports & Receipts: Easily combine multiple photos of paper receipts into a single PDF file for accounting submissions.
- Identity Verification: Safely compile front-and-back photos of your driver's license or passport without exposing them to cloud storage.
- Creative Portfolios: Consolidate high-resolution graphic designs, sketches, or photography into a unified document to send to clients.
- Scanned Documents: If your scanner outputs individual JPG files instead of a continuous PDF, use this tool to quickly bind them together.
Pro Tip: How to reach strict PDF file size limits (e.g. Under 500KB)
Many government portals, school systems, and email providers enforce strict file size limits (often under 1MB or 500KB). If your original images are massive (e.g., a 4MB photo from a modern smartphone), merging them will result in a huge PDF.
To solve this, we built a Target PDF Size compressor directly into the tool. Enter your desired maximum size (like 500 KB). Our algorithm will recursively evaluate and scale down your image resolutions via an HTML5 <canvas> context, optimizing the JPEG quality on-the-fly until your final PDF hits the exact size requirement.
For Developers: How does client-side PDF generation work?
Behind the scenes, we use the @cantoo/pdf-lib package. When you import an image, we convert the raw ArrayBuffer into a format the library understands (embedJpg() or embedPng()). We then call pdfDoc.addPage([width, height]) and paint the image buffer onto the digital page using the drawImage() context. This bypasses the need for heavy server-side libraries like ImageMagick or Ghostscript, resulting in lightning-fast, zero-cost processing.
// 1. Convert file array buffer to embeddable image
const image = isJpg
? await pdfDoc.embedJpg(arrayBuffer)
: await pdfDoc.embedPng(arrayBuffer);
// 2. Add a new blank page to the document matching image dimensions
const page = pdfDoc.addPage([image.width, image.height]);
// 3. Draw the image onto the page
page.drawImage(image, {
x: 0,
y: 0,
width: image.width,
height: image.height
});
Frequently Asked Questions
Why should I convert an image to a PDF document?
Converting images to PDF ensures maximum compatibility across all devices and operating systems without formatting issues. It is the industry standard for sending professional documents, resumes, receipts, and portfolios, and it preserves formatting better when printing.
Can I convert multiple JPG or PNG images into a single PDF?
Yes. Our tool allows you to select and upload multiple images at once. It will merge all of the selected image files into one continuous, multi-page PDF document automatically.
Is it safe to convert highly sensitive photos to PDF online?
Yes, it is absolutely safe when using our tool because it utilizes Zero-Knowledge Client-Side Processing. The entire conversion happens locally in your browser memory. Your images are never uploaded, transferred, or saved on any remote server.
Will my images lose quality during the PDF conversion?
No. If you leave the 'Target PDF Size' option blank, we embed the exact raw image data directly into the PDF without applying any additional compression or resizing, ensuring 100% of the original visual quality is retained.
How can I convert an image to PDF on my iPhone or Android?
You do not need to install any third-party apps. Because our converter runs on modern HTML5 web technologies, you can open this page in Safari or Chrome on your mobile device, select photos from your camera roll, and convert them instantly.
How do I compress my Image to PDF conversion to a specific file size?
Before clicking Merge, enter your desired file size (e.g., 500 KB) in the 'Target PDF Size' input box. Our tool uses a dynamic scaling algorithm to shrink your image resolution and optimize the JPEG quality until it fits your targeted file size.
What image formats are supported by this converter?
Our offline converter specifically supports the two most common web and photography image formats: JPG (JPEG) and PNG. If you have HEIC photos from an iPhone, you will need to convert them to JPG first.
Can I reorder my images before generating the final PDF?
Yes. Once you upload your images, they will appear as thumbnails in the preview area. You can visually verify the order. If they are incorrect, you can clear them and re-select them in the exact order you want them to appear in the PDF.