Reduce PDF size on Android and find the saved file

PDF, photos or Samsung note: What are you starting with?

The compressor processes PDF files. Whether you already have a finished PDF or only photos or a note therefore determines the first step.

If your pages are photos, create a PDF from them with Create a PDF from JPG/PNG scans. The tool accepts JPG and PNG files, but not photos in HEIC format.

Samsung Notes: save as PDF first

Samsung's German help pages describe how to export a note. Open the note, tap the three dots for “More options”, choose “Save as file” and select PDF as the format. This is shown in the Samsung help on Samsung Notes using a Galaxy Note20 as an example and in the guide for the Galaxy Tab S10 Ultra. The menus on your device may look different.

No setting for the size of the PDF is described there. So reduce the exported PDF afterwards in the browser. The note itself stays unchanged. Page through the exported pages once before you continue.

“Compress” in Files by Google creates a ZIP

This feature packs selected files or folders into a ZIP archive and, according to the Google help on Files by Google, requires Android 8 or later. The PDF is only packed, not reduced itself. If a portal or recipient requires a PDF, the ZIP file therefore won't help you.

Reduce a PDF in the browser, without a new app

You don't need an additional app for this method. The tool runs in the browser, for example in Chrome, and processes the PDF on your device. It does not send the content of your PDF to a processing server. However, the browser loads the page and its program components from the internet, so plan on having a connection to open it. How smoothly selection, processing and saving work depends on the browser and device.

1. Open Compress PDF in Chrome.
2. Tap “Choose PDF”. Android then opens a document picker. What it looks like and which storage locations it offers varies by device. Select your saved PDF there.
3. The page now checks the file and shows a preview. Nothing is reduced yet at this step.
4. Under “Method”, choose one of the options Balanced, Smaller file or Lossless optimization.
5. If your recipient specifies a fixed limit, enable “Set target size” and enter the value.
6. Tap “Compress PDF”. Then compare the displayed size and check in the preview whether everything is easy to read.
7. Tap the link with the file name and “download”. Keep the page open until the file is saved, because the link expires when you leave the page.

Which method fits?

• Lossless optimization reorganizes the structure of the PDF and packs data streams more efficiently, including those of images, without changing image content or image quality. This fits when the images should look exactly as before.
• Balanced and Smaller file can re-save suitable embedded images as JPEG. For image-heavy scans, this can save more space, but it changes image data. So check fine print, stamps and signatures especially carefully.

None of the methods lowers the resolution, removes pages or adds text recognition. Every attempt starts from the original, and the smallest valid version is offered. If no smaller file results, you receive an unchanged copy of the original. A target size means that the result may be at most as large as the value entered. Whether this can be achieved depends on the content of the PDF. If it doesn't work, PDF won't get smaller lists possible causes and suitable next steps.

If the PDF is rejected

The compressor does not process encrypted, digitally signed or certified PDFs. The same applies to files whose structure cannot be read. A scanned signature, on the other hand, is only an image and not a digital signature, so it doesn't stand in the way of reducing the file. The guide to signatures and forms explains more.

And the compressor apps from the Play Store?

Some apps advertise that they process documents offline. Whether an app also sends usage data or makes account and license requests cannot be reliably determined from the store description and reviews. Compress PDF without uploading compares how the methods differ.

Find the new PDF in Downloads or Files

Chrome stores downloaded files in the default download location, as described in the Google help on downloading in Chrome. Two ways lead to the finished file.

• In Chrome: Open the three-dot menu and tap Downloads. If the address bar is at the bottom, swipe it up and then tap Downloads. There you can see the status of the download and rename, share or delete the file.
• In the file app: On many devices it is called “Files”, but some manufacturers supply their own app with a different name. There, open the relevant category and sort by date, name or size, as described in the Google help on files on Android.

Tell the new file and the original apart

1. Sort by date. The PDF you just saved will then usually be at the top.
2. Compare the name and size with the details the tool page displayed with the result.
3. Open the file directly from the list and not via the preview on the tool page.
4. Page through all the pages you need and check whether everything is easy to read.
5. If needed, give the file a distinct name so that you can reliably recognize it when uploading.

When reducing, the page only reads the original and does not overwrite or delete it. If you save or rename the new file yourself, give it its own name and keep the original until you have successfully used the new file.

No download visible?

First check in Chrome Downloads whether the download is still running or was canceled. As long as the tool page is open, you can tap the link with “download” again. If you have already left the page, start again with the original. If the result PDF opens in Chrome instead of being saved, choose “Download” there in the three-dot menu. Do not, however, save the tool page itself as a PDF, because then you would have a copy of the web page and not your document.

Saving to a cloud folder and sharing from Downloads are separate steps. In doing so, the PDF goes to the respective service or recipient, even if the reduction itself took place on the phone.

Displayed doesn't mean saved

On a phone, you often see a PDF before it exists as a file on the device. Three situations look similar but mean different things.

According to the Google help on PDFs in Chrome, Chrome's built-in PDF features require Android 12 or later. In Incognito mode, Chrome offers to download the file instead of opening it. These conditions concern Google's viewer and not the reduction on our site. With “Open with”, you hand the PDF over to another app on your device.

When large scans overwhelm your phone

The compressor accepts PDFs up to 50 MiB, which is 52,428,800 bytes. This limit protects against files that are too large, but it does not promise that every phone can handle a file that large. During processing, the browser needs working memory, and image-heavy scans can use more of it than their file size suggests. Free device storage for photos and downloads is something different from this working memory.

Not every error message means that memory is insufficient. Read the message carefully: you solve problems with file type, size or encryption differently from an abort during processing.

• Smaller starting file: Scan at a lower resolution or in grayscale, if your scan app offers this, and capture only the pages you really need. Reduce large scans in a targeted way explains how.
• Split it if the recipient accepts multiple files: Split PDF accepts PDFs up to 50 MiB and 250 pages, provided your device can process them. Then reduce the parts individually and check their size. If the file is larger, split it with an installed program or recreate it from the source in smaller sections.
• Photos instead of a finished PDF: If you still have the pages as JPG or PNG, build a new PDF from them with Images to PDF. Each image may have at most 40 million pixels.
• Computer: If the phone's working memory isn't enough, a computer's browser can help; the 50 MiB limit applies there just the same. The guides for Windows and Mac also show further options there.

Don't remove pages your recipient requires just to make the file smaller. Also keep the original until a result is complete and legible.