An image to PDF converter takes one or more pictures and packs them into a single PDF file. It sounds simple, but many free converters add a watermark, ask you to sign up or make you wait in a queue. This guide shows what a good converter should do, and how to make a clean PDF in about a minute with the WriteDroid Image Scanner.
What a good image to PDF converter should do
- No watermark. A PDF for a job application or a form should look professional, not carry a logo across the page.
- No sign-up. You should not need an account to convert a few pictures.
- Many images in one PDF. Most forms ask for one file, not five.
- Page order control. You should be able to move pages before you save.
- Page size and quality choices. Government and job portals often have size limits.
- Works on any device. Phone, tablet and computer, with nothing to install.
How to convert images to PDF, step by step
- Open the image scanner. It works as a free image to PDF converter.
- Press Choose images and select your files. You can pick many images at once. On a computer you can also drop them onto the page.
- Crop each page so only the paper shows, or press Full page to keep the whole picture. Press Apply to confirm.
- Use Move left and Move right to put the pages in order. Use Rotate if a page is sideways.
- Open PDF options to choose the page size, margin and quality.
- Press Save PDF. Your file downloads straight away.
The PDF options explained
- Page size. A4 is standard in most countries. Choose US Letter for the United States and Canada. Fit to image keeps each page the exact size of its picture.
- Margin. None fills the page. Small and Large leave white space around the picture, which looks neater when printed.
- Quality. High keeps the most detail. Small file makes a lighter PDF that is easier to email or upload.
- Page numbers. Useful for longer documents.
- Two pages per sheet. Handy for the front and back of an ID card on one page.
JPG, PNG and phone photos
JPG, PNG and most photos taken on a phone work. If a photo from an iPhone is in HEIC format, your browser may not open it. In that case change the camera format to Most Compatible in Settings, or share the picture as a JPG before you convert it.
How to get a small PDF
Many portals limit uploads to 1 or 2 MB. To keep the file small, crop away the table or background, choose the Small file quality and avoid photos taken at maximum zoom. If the PDF is still too large, split the pages into two files.
Is it private?
Your pictures are processed in your browser on your own device and are not stored on our server. The scanner also has an optional AI page detection feature. If you turn it on, each photo is sent to an AI service only to find the page edges, and it is not saved. Turn it off if you prefer that nothing leaves your device.
What this converter does not do
It does not read the text in your pictures, so the PDF is made of images and you cannot search or copy the words. It also does not sync to a cloud account. If you need those, use a dedicated app. For turning pictures into a tidy PDF, it does the job without any fuss.