Why combine images into a PDF
A PDF is the universal envelope for fixed-layout documents. When you have a handful of images that belong together — pages of a scanned contract, a set of receipts for an expense claim, a portfolio of photos, or screenshots that tell a story — wrapping them in a single PDF turns a messy folder into one tidy file that opens identically on any device, prints predictably, and is easy to email or upload to a portal that only accepts PDFs.
Sending ten separate JPGs is fragile: they arrive out of order, some get stripped by email clients, and the recipient has to open each one. A PDF preserves the order you chose, keeps everything in one attachment, and renders the same whether it is opened on a phone, a laptop, or a printer. That reliability is why so many official forms and submission systems ask specifically for a PDF.
This tool does the assembly entirely in your browser. Your images are decoded, rotated, optionally compressed, and written into a PDF on your own machine — no upload, no account, no watermark. That makes it safe for sensitive material and fast for large batches, and it keeps working even when you are offline once the page has loaded.
Choosing a page size and orientation
The page size decides the canvas each image sits on. Auto-fit makes every page exactly match its image, so there are no borders and nothing is letterboxed — ideal when the images themselves are the document, like a photo book or a comic. Standard sizes (A4, Letter, Legal) give you consistent, printable pages where each image is centred within the page and scaled to fit, which is what you want for documents that will be printed or filed.
Orientation controls whether pages are tall (Portrait) or wide (Landscape). Locking it keeps every page identical, which looks clean for a uniform set of images. Auto orientation is the clever option for mixed sets: each page rotates to match the aspect ratio of the image it holds, so a wide panorama gets a landscape page while a tall poster gets a portrait one, and none of them are awkwardly shrunk to fit the wrong shape.
Custom sizing covers the cases the presets miss — a square page for Instagram exports, a wide page for spreadsheets, or an exact print dimension your printer expects. Whatever you pick, the image is always scaled to fit inside the page while preserving its aspect ratio, so it is never stretched or distorted.
One image per page versus a grid
By default each image gets its own page, which is the right choice for documents where every image matters on its own: contract pages, full-size photos, or anything someone will read one screen at a time. Each image is centred and scaled to the page so it is as large as the margins allow.
The grid layout packs multiple images onto each page — 2, 4, 6, or 9 — flowing left to right and top to bottom. This is how you make a contact sheet of a photo shoot, a single-page summary of several receipts, or a collage. Each image keeps its aspect ratio inside its cell, so nothing is cropped or squashed, and the last page simply leaves any unused cells empty.
Margins frame the result. With no margin, single-image pages are full-bleed and grids run edge to edge; with a larger margin you get a clean border that suits printing and binding. The margin applies uniformly so the document looks consistent from the first page to the last.
Compression: smaller files without the quality hit
Photographs are heavy. A modern phone photo can be several megabytes, and a dozen of them embedded losslessly would make an unwieldy PDF that is slow to send and slow to open. With compression enabled, each image is re-encoded as a JPEG using a MozJPEG-based codec — the same high-quality encoder behind our compression tool — before it is embedded. The result is typically a fraction of the size with no difference the eye can see.
Compression runs in a background worker thread, so the interface stays responsive even with a large batch, and the codec is downloaded once and cached for next time. The quality is tuned to the sweet spot where files shrink dramatically but artefacts stay invisible, which is exactly what you want for documents made of photos and scans.
When you need every pixel preserved — line art, diagrams, text-heavy screenshots, or anything destined for high-quality print — turn compression off and the images are embedded losslessly as PNGs. You trade a larger file for perfect fidelity. The choice is a single toggle, so you can try both and keep whichever looks right.
Privacy, metadata, and the reverse trip
Because the entire conversion happens on your device, this tool is safe for confidential material: ID documents, medical forms, bank statements, and anything else you would not want sitting on a stranger's server. The bytes stay local, there is no cloud copy to leak, and you can verify it by watching your network tab stay quiet while the PDF is built.
You can also stamp the document with a title and author, which are written into the PDF's metadata. A good title shows up in the browser tab and in most readers' window chrome, makes the file searchable, and looks professional when the document lands in someone's inbox or a shared drive. It is a small touch that turns a throwaway export into a proper document.
When you need to go the other way, our PDF-to-image tool rasterises any PDF page back into a PNG, JPG, or WebP at the resolution you choose, and our compression and resize tools help you prepare images before they go into a PDF. Together they cover the whole loop between images and documents — all in the browser, all without surrendering your files.