How to Combine Images into One PDF (JPG, PNG & HEIC)
Receipts for an expense report, photos for a client, screenshots for a proposal — sooner or later you need several images in one PDF. Here's how to combine JPG, PNG, and even HEIC photos into a single document in your browser, without uploading anything or paying for a watermark-free export.
Why Combining Images Is So Often Annoying
The tools people reach for first — email, printing, or free online converters — all add friction. Emailing photos to yourself and printing them page by page is slow, and online converters ask you to upload every image to their servers, cap file sizes, and stamp watermarks on free exports.
Modern browsers remove most of that friction. A page can read image files locally with the File API, decode even HEIC photos with WebAssembly, and assemble a real PDF with a library like jsPDF — all on your device, with no upload step at all.
That means receipts, scans, phone photos, and client documents can become a single PDF in seconds, with no account, no queue, and no watermark. If you'd rather your images never touch a third-party server — a reasonable instinct for anything with a face, a signature, or a price on it — a client-side converter is the cleanest option.
Online Converters vs. In-Browser Conversion
- Upload-based converters. Every photo is sent to a remote server, processed, and (hopefully) deleted later. Personal and client images pass through third-party infrastructure you don't control.
- Free-tier limits. Size caps, conversion queues, and watermarks on output push you toward paid plans for routine tasks.
- Client-side converters. Files are read and processed on your device. Nothing is uploaded, there are no size limits, and output is watermark-free by default.
- HEIC included. Modern in-browser tools decode iPhone HEIC photos locally with WebAssembly, so you don't need a separate conversion app first.
The trade-off for client-side conversion is simple: your device does the work. For batch jobs of a few dozen photos on a modern laptop or desktop, the difference is imperceptible — and the privacy win is permanent.
How to Combine Images into One PDF, Step by Step
Using the Prescosoft converter, the whole job takes under a minute:
- 1 Drop in your images. Drag and drop JPG, PNG, or HEIC files onto the converter, or click to browse. You can add as many as you like — there's no server-side cap.
- 2 Arrange the order. Each thumbnail has up and down buttons to reorder pages and an ✕ to remove an image. The PDF follows your thumbnail order exactly.
- 3 Set the page. Choose A4, Letter, or Auto page size; Portrait, Landscape, or Auto orientation; and the page margin that suits your document.
- 4 Convert and download. Click Convert — the PDF builds in your browser and downloads as
images-to-pdf.pdf, one image per page, no watermark.
Choosing Page Size, Orientation & Margin
| Setting | Best for | Notes |
|---|---|---|
A4 |
Printing & filing | 210×297 mm — the standard outside North America |
Letter |
Printing & filing | 215.9×279.4 mm — the North American standard |
Auto |
Screen-only docs | Each page sized to its image — ideal for receipts and screenshots |
Portrait / Landscape |
Mixed photo batches | Lock one orientation, or let Auto match each image's natural orientation |
A small margin (5 mm) keeps images off the page edges and looks clean when printed; None is best for edge-to-edge screenshots. When in doubt, A4 or Letter with a small margin is a safe default for anything you might print later.
HEIC Photos, Quality, and Getting It Right
A few things worth knowing before you convert:
HEIC works in your browser
iPhone and iPad photos in HEIC format decode locally via WebAssembly (libheif). The first conversion loads a ~1.3 MB module; after that it's cached.
Original pixels are kept
JPG and PNG files are embedded without server-side recompression, so image quality in the PDF matches the source. HEIC converts to high-quality JPEG locally.
Order matters — and you control it
Reorder thumbnails before converting. A little care here saves you rebuilding the PDF when the client wanted the contract before the photos.
Nothing leaves your device
Files are read locally, HEIC is decoded locally, and the PDF is built locally. When you close the tab, your images are gone from the page.
Frequently Asked Questions
What is the fastest way to combine photos into one PDF?
The fastest way is a browser-based converter like Prescosoft's: drag in all your JPG, PNG, or HEIC photos, arrange the order, and click Convert. The PDF is built locally and downloads instantly — no app install, no upload queue, no account.
Can I put HEIC photos from my iPhone into a PDF?
Yes. HEIC and HEIF images are decoded locally using WebAssembly (libheif), so photos straight from an iPhone or iPad convert to PDF without converting them to JPG first. This works in Chrome, Edge, and Firefox; Safari reads HEIC natively.
Will my images be uploaded to a server?
No. The converter reads your files locally with the File API, decodes HEIC with WebAssembly on your device, and builds the PDF in your browser with jsPDF. Nothing is sent to any server — which matters for personal photos and confidential client documents.
Which page size should I choose for a PDF of photos?
Use A4 or Letter if you plan to print or file the document — most printers and scanners default to those sizes. Use Auto if you want each page sized exactly to its image, which is ideal for screen-only documents like receipts and screenshots.
Do free online converters watermark my PDF?
Many do. Free tiers of popular online converters stamp watermarks on output, cap file sizes, or force queue times. Client-side converters like Prescosoft's produce clean PDFs with no watermark, no size cap, and no waiting — the trade-off is that processing happens on your device.
How do I control the order of images in the PDF?
After adding images, each thumbnail has up and down buttons to reorder it, and an ✕ button to remove it. The PDF pages follow your thumbnail order exactly, so you can assemble a document in the order you need.
Combine your images into one PDF — privately
Drag in JPG, PNG, or HEIC photos, arrange them, and download a clean PDF in seconds. Nothing is uploaded, no watermark, no limits.