Convert JPG & PNG to PDF (100% Private)

Merge multiple images into a single PDF instantly. No uploads required, entirely offline and secure.

Zero-Knowledge: Files never leave your device

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.

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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

1

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.

2

Configure Layout

Rearrange the thumbnails to set the document order. Choose a page size (A4, US Letter) or leave it as "Fit to Image".

3

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.

const pdfDoc = await PDFDocument.create();

// 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

Is it safe to convert my sensitive images to PDF online?

Yes, absolutely safe. Unlike most online image converters that upload your photos to a remote server, our tool uses Zero-Knowledge Client-Side Processing.

This means the entire conversion process happens locally inside your web browser. Your images are never uploaded, transferred, or saved on any server.

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 perfectly fits your targeted file size.

Will the image quality be reduced if I don't use compression?

No. If you leave the Target Size blank, we embed the exact raw image data you provide directly into the PDF without applying any additional compression or resizing, ensuring 100% original visual quality.