How to turn photos into a PDF (and get the pages back out)
Half the paperwork of everyday life ends with "upload a PDF": a photographed receipt for an expense claim, three pages of a signed contract, an ID scan for a visa portal, a set of screenshots for a support ticket. The photos are on your phone as JPG or HEIC; the form wants a single PDF under some size limit. This guide explains what a PDF made from photos actually contains, how to build one that looks right and stays small, and how to go the other way when someone sends you a PDF and you need the pages as images.
What a photo-PDF really is
A PDF page made from a photo is a page of a given size with the photo drawn on it. The photo itself is stored inside the file, and for JPG and PNG it can be stored exactly as it is: the PDF just carries the original bytes and tells the viewer where to draw them. That has two consequences worth knowing. First, the quality of the PDF is the quality of the photo — converting cannot make it sharper. Second, the PDF is roughly as large as the photos put together, so five 4 MB photos make a 20 MB PDF.
Formats a PDF cannot carry directly — HEIC from an iPhone, WebP saved from the web, AVIF, GIF, BMP — are decoded first and stored as JPG or PNG pixels. Done at a high quality setting, the difference is not visible; it does mean the page is no longer byte-identical to the original file, which only matters if you care about that.
Page size: fit, A4 or Letter
If the PDF will only be viewed on screens, make each page the size of its photo ("fit to image"). Nothing is scaled or padded, and the viewer shows every page edge to edge. If it will be printed, or you want the document to look like a document, choose A4 (most of the world) or US Letter (North America). Each photo is scaled to fit inside the page — never cropped — and centred. Automatic orientation puts wide photos on landscape pages and tall ones on portrait pages, so nothing is squeezed.
Margins are for printing and binding. A 10 mm margin keeps a photographed receipt from touching the paper edge; 20 mm leaves room for a hole punch or a signature. On screen, margins just add white space, so leave them at none for a screen-only document.
Getting the pages in the right order
- Add every photo first — up to 20 at a time. The order they are added is the order they start in.
- If the files are numbered (IMG_0412, IMG_0413 …) use Sort by name; cameras and scanners number in the order the pictures were taken.
- Move any page that is out of place with the arrows beside it. The thumbnails show exactly what will end up on each page.
- Turn off Combine only if the form wants each page as a separate file; otherwise one PDF with one page per photo is what nearly every recipient expects.
Keeping the PDF under the limit
A PDF of photos is large because the photos are large: 12 megapixels each, 3–5 MB as JPG, more as PNG. Portals and email typically cap attachments at 5, 10 or 25 MB. You have three levers, from least to most aggressive.
- Reduce file size in the Image to PDF tool re-encodes every photo at JPG quality 80 and caps the long side at 2480 pixels. That is about 300 dpi on an A4 page — sharper than any printer needs — and it turns a 4 MB phone photo into roughly 500 KB. A 20-photo document lands around 8–10 MB.
- Compress the photos first with a target size (say 300 KB each) in the compressor, then send the results to Image to PDF. This gives you an exact budget: 20 photos at 300 KB is a 6 MB PDF.
- Crop before you convert. A receipt photographed on a desk is mostly desk; cropping to the paper removes pixels that cost size and add nothing.
Photos rotated the wrong way are the other classic problem. Phones often store a photo sideways with a flag that says "display rotated"; tools that ignore the flag produce a PDF full of sideways pages. Toolkitta applies the flag before placing the photo, so what you see in the thumbnail is what lands on the page.
Going the other way: PDF pages as images
Sometimes the PDF is the input: a page of a contract to paste into a chat, a slide from a deck to reuse, a scanned form that a website insists on receiving as JPG. Rendering a PDF page to an image means choosing a resolution. PDF pages are measured in points (72 per inch), and the dpi you pick decides how many pixels each inch becomes.
- 72 dpi: the page at its nominal size, about 595 × 842 pixels for A4. Fine for a thumbnail or a preview.
- 150 dpi: about 1240 × 1754 pixels for A4. Sharp on laptop and phone screens; the sensible default for forms and messages.
- 300 dpi: about 2480 × 3508 pixels. Matches print resolution; use it when the image will be printed or zoomed into.
Choose JPG for pages with photographs and for anything that must be small; choose PNG for pages of text, tables or diagrams where crisp edges matter and size matters less. Convert only the pages you need — a range like 2-4, 7 — rather than all 60 pages of a manual, and download the batch as a ZIP named after the document with the page number in each file name.
Privacy and what stays in the file
Both directions run in your browser on Toolkitta: the photos and PDFs are read from your device and the result is written there. Nothing is uploaded, which also means there is no queue and no limit on how often you use it. A PDF built from photos does not carry the photos' EXIF metadata — camera, settings, GPS location — into the document; only the pixels go in. A page image rendered from a PDF is a fresh picture with no metadata from the PDF. Keep the originals if you need that information.