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.

Batch reduce size of multiple PDFs in Adobe Acrobat — How-to & AI prompts

AI prompts

3 ways to ask · copy any one

AExecute — “help me do it”Please help me make these PDFs smaller: [list your PDF files]…+

Please help me batch reduce the size of these PDF files in Adobe Acrobat: [list your PDF files or folder location].

when the reply comes backWant to combine your PDFs after reducing their size?

BImprove — “do it better”Can you make my PDFs even smaller without losing quality?…+

Can you suggest ways to make my batch of PDFs even smaller in Adobe Acrobat, but still keep them clear and readable?

when the reply comes backNeed to check if the PDFs still look clear after shrinking them?

CDecide — “help me choose”Which settings should I use to reduce PDF size for email?…+

Which Adobe Acrobat settings should I pick to reduce PDF size for emailing, so the files are small but still look good?

when the reply comes backCurious how to undo the size reduction if you need the originals?

How to do it

the tool · the steps · what to avoid

The tool

Adobe Acrobat

Reduce Size - Batch Processing

1
Open Adobe Acrobat (Pro version required for batch processing).
2
Go to the File menu and select Action Wizard.
3
Click New Action to create a custom batch process.
4
In the Choose Tools to Add panel, scroll to and add Reduce File Size to the action steps.
5
Click Specify Settings for Reduce File Size and select your desired compatibility level.
CautionReducing file size may lower image quality or remove some document elements.
6
Under Files to be Processed, click Add Files or Add Folder to select all PDFs you want to process.
7
Click Save to name and save your new action.
8
With your action selected, click Start and follow the prompts to process and save the reduced PDFs.
Best practiceFor large batches, save output files to a new folder to keep originals and reduced versions organized.

In the appWith the API

You can automate reducing the size of many PDFs at once using the Action Wizard in Acrobat Pro.

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

Glossary

words on this page

BatchDoing the same task to many files at once.ExampleHe decided to Batch convert all 20 image files to JPEG format at once.

Reduce sizeMake the file take up less space on your computer.ExampleYou reduce size of the image to fit more photos on your hard drive.

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.

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 'Optimize PDF' or 'Reduce File Size' tool to shrink several PDFs at once. You just select all the files you want, choose your settings, and Acrobat will make them smaller together.

Reducing the size of a PDF means making the file take up less storage space, which helps when sending by email or saving room on your device.

If you have many large PDFs, making them smaller all at once saves time and helps you share or store them more easily.

Reducing size one by one means you do each file separately, which takes more time. Batch reducing lets you do many files together, which is faster and easier.

Sometimes, making a PDF smaller can lower the quality of pictures or text. It's important to check your files after reducing them to make sure they still look good.

Batch reduce size of multiple PDFs

When to use it

AI prompts

How to do it

Glossary

The real tasks

Who does this

FAQ

Sources

Adobe help