图片转 PDF

How Images to PDF Works

ConvertUnlimited uses jsPDF, a lightweight JavaScript library, to generate PDF documents directly in your web browser. When you upload images, they are temporarily stored in your browser's RAM as raw pixel data. Our tool then arranges these images onto a PDF canvas based on your chosen orientation, page size, and margins.

Because the PDF construction happens entirely on your own device, your sensitive documents and personal photos are never transmitted over the internet. This local-first model provides local browser-based processing and avoids the long wait times associated with traditional cloud-based PDF creators.

Why Combine Images into PDF?

• Document Organization: Group related photos (like receipts, IDs, or homework) into a single file.
• Compatibility: PDF is the universal standard for documents and can be opened on any device without losing formatting.
• Email Friendly: Most email clients handle one PDF attachment better than ten individual image files.
• Printing: PDF files preserve the layout and scale of your images, ensuring they look perfect when printed.

Best Formats for PDF Documents

While we support JPG, PNG, and WebP, JPG is usually the best choice for scanned documents or photographs due to its balance of quality and file size. PNG is better for screenshots or graphics where high-contrast text must remain perfectly sharp.

Local Browser-based PDF Generation

Most "Online PDF" tools upload your files to their disks. ConvertUnlimited provides the logic as a static script that runs in your local environment. Your data stays under your control at all times, making it safe for corporate assets, financial documents, and private photos.

Frequently Asked Questions

Is there a page limit?

We don't impose a limit, but very large batches (50+ high-resolution photos) may exceed your browser's allocated memory. If the tab becomes unresponsive, try creating smaller PDFs.

Can I reorder the images?

Yes. Simply use the individual "Move Up" or "Move Down" buttons (or remove images) to adjust the sequence before generating the final PDF.

Will my images lose quality?

We embed images at high resolution. However, downscaling may occur depending on your chosen page size (like A4) to ensure the document remains printable.

Browser Support

This tool works in all modern browsers supporting the HTML5 Canvas API and File API, including Chrome, Firefox, Safari, and Edge.