How do I reduce the size of a PDF without losing quality?

To reduce PDF size while keeping good quality, start with the 'Low (High Quality)' compression setting in Acrobat. This option often reduces the file size by 10-30% because it skips re-compressing images. Text quality is never affected by compression, only images. Always work from your original file.

What is the difference between image quality for screen viewing versus printing?

Image quality for screens and print is different. For viewing on a screen or sending by email, images with 72-100 DPI are usually fine and look clear. However, for good quality printing, images need to be much higher, around 300 DPI. Using low DPI images for printing will make them look blurry or pixelated. Always match your compression settings to how the PDF will be used.

Why does compressing a PDF multiple times make the file worse?

Compressing a PDF multiple times makes it worse because each time you compress, more image data is removed or changed. This is like making a copy of a copy; each new copy loses more detail. To keep the best quality, always compress the original PDF document, not a file that has already been compressed before.

If my PDF has mostly text, will reducing its size affect the text quality?

No, if your PDF has mostly text, reducing its size will not affect the text quality. Compression in Acrobat only changes images, not text. Your text will always remain clear and sharp, no matter how much you reduce the file size.

Can I automate the process of reducing PDF file size for many documents?

Yes, you can automate reducing PDF file size for many documents using the Adobe PDF Services API. This API allows you to programmatically compress PDFs with different levels: LOW, MEDIUM, or HIGH. You can integrate this into your own systems to handle large batches of files efficiently.

◆ Acrobat · compress

Reduce size for mobile viewing

Every [event=audit] forces me to manually compress and reconcile archives. I want a repeatable delivery method that pr…

3ready prompts

1real task

3roles

See the prompt↓More compress workflows

AI prompts

3 ways to ask · copy any one

AExecute — “help me do it”Please reduce my PDF size for easier mobile viewing by...…+

Please reduce my PDF size for easier mobile viewing by compressing [file name] and making sure it still looks clear on a phone.

when the reply comes backWould you like tips for keeping images clear after reducing size?

BImprove — “do it better”Can you improve my PDF so it loads faster and...…+

Can you improve my PDF so it loads faster and is easier to read on a mobile device? The file is [file name].

when the reply comes backNeed help checking if your PDF works well on different phones?

CDecide — “help me choose”What is the best file size or settings for...…+

What is the best file size or settings for a PDF that will be read mostly on mobile phones? I want it to be easy to open and read.

when the reply comes backWant advice on sending your smaller PDF by email or chat?

How to do it

the tool · the steps · what to avoid

1
Open your PDF file in Adobe Acrobat.
2
Go to the File menu and select Save As Other.
3
Choose Reduced Size PDF from the submenu.
4
Select the desired compatibility option in the dialog that appears.
CautionChoosing a lower compatibility may prevent older PDF viewers from opening the file.
5
Click OK to proceed.
6
Enter a new file name and location if prompted, then click Save.
Best practiceFor best results, always save the reduced file as a new copy to preserve your original PDF.

In the appWith the API

You can quickly reduce the file size of your PDF using the 'Save as Other' option in the File menu.

This runs in the Acrobat app - there is no separate API for this task.

Glossary

words on this page

PDFA common file type used to share documents that look the same everywhere.ExampleShe saved the brochure as a PDF so everyone would see the exact same layout and fonts.

CompressTo make a file smaller in size.ExampleYou can compress the large image file to make it easier to email.

Mobile ViewingLooking at something on a phone or tablet.ExampleReading the news article on your tablet while commuting is convenient.

The real tasks

the one, listed here

Avoid ad-hoc compression work every audit

FAQ

about this task

In Adobe Acrobat, you can use the 'Reduce File Size' or 'Optimize PDF' feature. These tools make your PDF smaller so it loads faster and is easier to open on a phone.

Optimizing a PDF for mobile viewing means making the file smaller and easier to read on a phone or tablet. This often involves compressing images and simplifying the layout.

PDFs can be large if they have lots of images or detailed graphics. Making the file smaller helps you send it more easily through apps like WhatsApp or email.

Compressing reduces the file size, often by lowering image quality. Optimizing can also remove extra data and adjust settings to make the PDF better for mobile, not just smaller.

Smaller PDFs open faster and use less data, which is helpful for people with slow internet or limited storage on their phones.

Reduce size for mobile viewing

When to use it

AI prompts

How to do it

Glossary

The real tasks

Who does this

FAQ

Sources

Adobe help