Image to PDF Converter
Scans, receipts and screenshots into one PDF — assembled on your device, not on someone's server.
Images are stored as JPEG inside the PDF. Lower quality means a much smaller file.
Page order
Use the arrows to reorder pages, or × to remove one.
What the image to PDF Converter does
Converting images to PDF is one of the most commonly searched file tasks, and almost every free tool for it works by uploading your files. That is exactly backwards: the images people need as a PDF are usually photographed receipts, signed forms, ID documents and scanned letters — the files you should be least willing to hand to an unknown server.
This converter builds the PDF in your browser. Each image is drawn to a canvas, encoded as JPEG, and written directly into the PDF's structure using the DCTDecode filter, which stores JPEG data without recompressing it. The result is a standard PDF that opens in any reader.
Page handling offers a real choice. A4, Letter and the other named sizes place each image centred on a fixed page, scaled to fit inside your margin — the right choice for anything that will be printed or filed. Fit page to image makes each page exactly the size of its image, so there is no white space at all; that suits screenshots and images meant to be read on screen rather than printed.
Orientation set to automatic gives each page the orientation of its own image, so a mixed batch of portrait scans and landscape photographs comes out sensibly rather than forcing everything one way.
Quality is the main lever on file size. Because images are stored as JPEG, dropping from 92% to 75% typically halves the PDF with no visible difference on a photograph. For a scan of text, keep it high — JPEG artefacts around letter edges are far more noticeable than on a photo.
How to use it
- Select all the images at once — they become pages in the order you see listed.
- Reorder with the arrows if the file names did not sort the way you wanted.
- Choose A4 or Letter for anything that will be printed; fit-to-image for screen reading.
- Press Build PDF. The file is assembled locally and saved straight to your downloads.
A worked example
Six phone photographs of a signed contract, each about 3000 × 4000 pixels:
| Settings | Result |
|---|---|
| A4, portrait, 36pt margin, quality 92 | 6 pages, ~4.1 MB, prints correctly |
| A4, portrait, 36pt margin, quality 70 | 6 pages, ~1.6 MB, still perfectly legible |
| Fit to image, 0 margin, quality 92 | 6 pages of odd sizes, ~4.1 MB, no white space |
The middle row is usually the right answer for emailing a signed document: under two megabytes, which slips past most attachment limits, and the text is entirely readable. The bottom row is what you want for a set of screenshots destined for a bug report, where consistent page sizes do not matter and empty margins just waste screen space.
Frequently asked questions
Are my images uploaded to make the PDF?
No. The PDF is constructed in this page's JavaScript and handed straight to your downloads folder. That is the main reason to use a local tool for this job — the documents people convert are usually sensitive.
Why are images stored as JPEG inside the PDF?
Because JPEG data can be embedded in a PDF directly, without recompression, using the format's built-in DCTDecode filter. That keeps the writer small and the output standard. Transparency is flattened onto white, since PDF pages have no alpha channel.
How do I make the PDF smaller?
Lower the JPEG quality — 70–80% typically halves the file with no visible loss on photographs. Reducing the images' pixel dimensions first with the Image Resizer helps even more, since file size scales with pixel count.
Can I combine an existing PDF with new images?
Not with this tool — it builds a new PDF from images only. Merging existing PDFs requires parsing them, which is a much larger job than writing one.