# PNG to PDF Converter

> A free online tool that puts PNG or JPG images in one PDF, one image on each page, in the order you set, on pages that fit each image or on A4 or Letter pages.

Use this free PNG to PDF converter to turn screenshots, scanned drawings and other PNG images into one PDF file. Each image becomes one page. You upload your files, choose the page order and page size, and download the result. No signup is needed for a basic conversion.

## Key facts

- Input: PNG or JPG files, up to 20 without an account (100 signed in), each up to 5 MB (10 MB signed in); each PNG up to 16 megapixels and all PNG files of one job together up to 32 megapixels without an account (64 signed in); animated PNG, WebP, GIF, TIFF, BMP, AVIF, HEIC and SVG are refused.
- Settings: page order, page size (fit each image, A4 or Letter), orientation (A4 and Letter) and margin (none, 0.25, 0.5 or 1 inch).
- In our test three generated PNG screens of 111 KB together became a PDF of 3 pages and 87 KB on A4 pages; a transparent area showed as the white page. Results vary with the file.
- The PDF has no password. Without an account each image is uploaded with its own human check.
- API: POST each image to https://api.aiipworld.com/v1/uploads, then POST https://api.aiipworld.com/v1/pdf-jobs with op image_to_pdf and the upload ids in page order, and poll GET /v1/jobs/:id.
- Free without an account: 20 PDF jobs per day per visitor, no watermark. Signed in, each job costs 1 credit, plus 1 credit for each started 20 images beyond the first 20 and for each started 20 MB of result beyond the first 20 MB (100 free credits every month).
- Files are deleted automatically: 10 minutes after conversion without an account, 1 day with a free account.

## How it works

1. Add your PNG files. You can also add JPG files.
2. Put the files in the order you want the pages to appear.
3. Choose a page size: Fit each image, A4 or Letter.
4. Choose the orientation and margin.
5. Select "Convert to PDF" and download the file, named images.pdf.

## How to convert PNG to PDF

Start by adding your PNG files to the tool. The tool checks each file by reading its first bytes, so the file must really be a PNG and not just named like one. Set the page order, page size and margin, then select "Convert to PDF". When the job ends, the result panel shows a download link for images.pdf.

The steps are the same for one file or many. If you want a quick way to convert PNG to PDF for free, this page does it without an account.

- Check the page order before you convert.
- Keep the file names if you want to find the pages again later.

## Put several PNG files in one PDF

To put several PNG files in one PDF, add all of them before you convert. Each image becomes one page, in the order you set. This is useful for a set of screenshots or a batch of scanned drawings.

Without an account, the images together can be up to 20 MB. Signed-in users can add up to 100 images per PDF, with the total up to 100 MB.

- Without an account, the limit is 20 images per PDF.

## Choose the page size

You can choose Fit each image, A4 or Letter as the page size. Fit each image makes each page the size of its picture. A4 and Letter give every page the same fixed size.

In our test, three generated PNG screens of 1000 x 640 px were converted on A4 pages with a small margin. All three were enlarged to fit the page, and the result panel reported this. Results vary with the file.

## Margins and orientation

You can set the orientation and a margin for the pages. The margin works with every page size. With Fit each image, the page grows by the margin on each side.

Use a margin if you want white space around your screenshots or drawings. Choose None for no margin, so the image fills the page.

## Is the image quality kept

The pixels of each PNG are decoded and packed into the PDF without changing them. The tool does not compress the picture to lower its quality. In our test, a transparent area showed as the white page behind it in the PDF, while the solid colors stayed the same.

Results vary with the file. Check the first page of your PDF before you share it.

## File size of the PDF

The PDF can be smaller or larger than the PNG files you add. In our test, three generated PNG screens of 37, 36 and 39 KB, 111 KB together, became a PDF of 87 KB on A4 pages with a small margin. With Fit each image, the same files gave a PDF of about 87 KB.

A photo saved as PNG is very big in a PDF too. Results vary with the file. These measurements were made on generated test files, not real documents.

## Limits: images, size and pixels

Each PNG can be up to 16,777,216 pixels (16 MP). All PNG files in one job together can be up to 32 MP without an account and 64 MP signed in. A PNG with many pixels takes more memory and more server work than a JPG, which is why these totals are limited.

Without an account, each image can be up to 5 MB. Signed-in users can use up to 10 MB per image.

## Which files are accepted

Only JPG and PNG files are accepted. WebP, GIF, TIFF, BMP, AVIF, HEIC and SVG files are refused. If you have one of these, convert it to JPG first. Animated PNG (APNG) files are also refused.

The tool reads the file type from the first bytes of the file, not from its name. A file renamed to .png is still refused if its content is another format.

## Convert PNG to PDF from code

You can also convert PNG to PDF with the API. Upload each file with a POST to https://api.aiipworld.com/v1/uploads. Send the raw bytes with Content-Type image/png or image/jpeg, one file per request. The answer contains an upload_id.

Then POST to https://api.aiipworld.com/v1/pdf-jobs with JSON that has op, params and files, where files lists your upload_id values. Poll GET /v1/jobs/:id until the job succeeds, fails or times out. The download_url is a short-lived signed link. Use an API key in the Authorization: Bearer header or in the x-api-key header.

The page shows a ready cURL, Node and Python example below the tool, built from the settings you choose. See /docs/ for the general API. Possible errors include 413 file_too_large, 422 unsupported_image, 402 insufficient_credits and 429 rate limited. A failed job can return error_code values such as too_many_pixels and unsupported_image.

## Privacy: what happens to your files

Your file is sent to our server, and the conversion is done there. You must have the right to use what you upload, as set out in the Acceptable Use Policy. The uploaded file is used only to make the result.

The working copy of the upload is deleted as soon as the job ends, whether it succeeds or fails. The result is deleted after 10 minutes in the free web tool. No history is kept, and download links are short-lived. Anonymous use needs a human check by Cloudflare Turnstile.

## Questions

### Can I convert PNG to PDF for free?

Yes, you can convert PNG to PDF for free on this page. It is a PNG to PDF free tool for basic use. Anonymous use needs a human check for each uploaded image, and it is limited to 20 PDF jobs per day per visitor.

### How do I put several PNG files in one PDF?

Add all the PNG files before you select "Convert to PDF". Each image becomes one page in the order you set.

### How do I change the order of the pages?

Set the page order in the tool before you convert. The pages follow the order you choose.

### Does converting PNG to PDF reduce the quality?

No. The pixels of each PNG are decoded and packed into the PDF without changing them. Results vary with the file.

### Why is my PDF smaller or bigger than the PNG files?

The PDF size depends on the file. In our test, three PNG files of 111 KB together became an 87 KB PDF. Photos saved as PNG can be very big in a PDF.

### Why are some images enlarged on A4 pages?

With A4 or Letter, each image is fitted to the page, so a small image can be enlarged. Choose Fit each image to make each page match its picture.

### How many PNG files can I add?

Without an account you can add 20 images per PDF. Signed-in users can add 100 images per PDF.

### Can I convert a screenshot to PDF?

Yes, a PNG screenshot can be converted to PDF. Each screenshot becomes one page.

### Does the PDF have a password?

No. The tool does not add a password to the PDF.

### Can I convert PNG to PDF in my own code?

Yes, you can use the API. Upload the file, create a PDF job and poll the job until it finishes. See /docs/ for the general API.

## Related

- [JPG to PDF](https://aiipworld.com/tools/jpg-to-pdf/index.md)
- [PDF to PNG: Convert PDF Pages to PNG Images](https://aiipworld.com/tools/pdf-to-png/index.md)
- [Merge PDF Files Online for Free](https://aiipworld.com/tools/merge-pdf/index.md)
- [Rotate PDF Online for Free](https://aiipworld.com/tools/rotate-pdf/index.md)
- [Compress PNG](https://aiipworld.com/tools/compress-png/index.md)
- [PNG to JPG Converter](https://aiipworld.com/tools/png-to-jpg/index.md)

Page: https://aiipworld.com/tools/png-to-pdf/