How to Reduce PDF File Size Without Losing Quality (2026)

A bulky PDF shrinking into a compact file to reduce PDF file size — AI-generated illustration

Short answer: To reduce PDF file size without losing quality, shrink the images and leave the text alone. Images are what make most PDFs large, and re-encoding them at about 150 DPI for screens (300 DPI for print) can cut an image-heavy file by 50 to 90%. Keep text selectable and searchable by using the Compress PDF tool in Keep text selectable mode, Mac Preview, or Word's minimum size export. Text-only PDFs shrink far less.

Which method keeps your text and quality?

Pick by what you have and what you need to keep. The methods that keep text as text come first.

Method	Text stays selectable?	Best for	Cost
Browser tool, Keep text selectable	Yes. Only images are recompressed	Any device, files you must not upload	Free, no upload
Mac Preview, Reduce File Size filter	Usually yes	A quick fix on a Mac	Free, built in
Word, Save as PDF, Minimum size	Yes	You still have the Word file	Needs Word
Delete, extract or split pages	Yes. Pages are copied, not changed	Files with pages you do not need, or a hard size limit	Free, no upload
Tool, By compression level or By target size	No. Each page becomes an image	Scans, or hitting an exact size such as 1 MB	Free, no upload

Why is my PDF so big?

Embedded images. A phone photo dropped into a Word document at full resolution can add several megabytes per page, and a scan at 600 DPI looks the same on a laptop screen as one at 200 DPI while weighing about nine times more. Fonts, form fields and metadata add a little but almost never explain a 40 MB file.

That is why a 200-page text report can be smaller than a 5-page scan of receipts. If your PDF is photos or scans, reducing images will move the needle. If it was exported from Google Docs with no images, it may barely shrink, and that is expected.

PDF size too big to email or upload?

To make a PDF less large for an email attachment or an upload form, run it through the Compress PDF tool. Pick a level, or type the size the form asks for, such as 1 MB, and download the smaller file. It runs in your browser, so the PDF is not uploaded.

How many DPI is enough? What "without losing quality" means

"Without losing quality" means visually the same at the size you will view it, not identical bit for bit. Use these as a guide:

150 DPI is the usual sweet spot for email, uploads and reading on screen.
300 DPI is what print shops want. Do not go below it for anything you will print.
72 to 96 DPI is where logos and small print start to look fuzzy. Avoid it for documents people must read closely.

Always work from the original. Every re-encode of a JPEG image adds artifacts, so shrinking an already shrunk file twice costs quality you cannot get back.

Method 1: reduce PDF size in your browser and keep the text

Open the Compress PDF tool and add your original PDF. The file is read in this tab and is not uploaded.
Choose Keep text selectable. Only the images inside the PDF are recompressed. Text, links and vector graphics stay exactly as they are.
Download the result and compare the size with the original.
Open it, zoom in on a page with photos, and try selecting some text. If the photos look too soft, go back to the original rather than shrinking the result again.

If the PDF has no large images, this mode barely changes the size and the tool says so. Then use one of the page-based methods below.

Method 2: reduce PDF size on a Mac with Preview

Open the PDF in Preview.
Choose File, then Export (not Export as PDF).
Open the Quartz Filter menu and choose Reduce File Size.
Give the copy a new name and save it, so the original is untouched.

The catch: that filter applies one fixed setting, often leaves images noticeably soft, and cannot aim for a target size. If the result looks blurry, go back to the original and use the browser tool instead, where you can compare options.

Method 3: export a smaller PDF from Word

If you still have the Word file, make the small PDF at the source. In Word on Windows, choose File, then Save As, pick PDF as the type, and under Optimize for select Minimum size (publishing online). Word then writes lower resolution images from the start, and the text stays real text. Before exporting, you can also shrink big photos with Picture Format, then Compress Pictures. In Google Docs, the download as PDF option has no size setting, so shrink the images in the document first or use Method 1 afterwards.

Method 4: send fewer pages instead of shrinking them

When the file is mostly text, or you only need part of it, the best saving is fewer pages. These copy pages as they are, so nothing is re-rendered:

Delete blank or extra pages first, so you are not shrinking junk.
Extract just the pages you need into a new file.
Split the PDF into two attachments when you are over a hard limit such as Gmail's 25 MB.
If you have the paper, scan at 150 to 200 DPI. That beats shrinking a 600 DPI scan later.

When you need an exact size, or the file is a scan

Portals that say "under 1 MB" or "under 200 KB" need a size, not a method. For that, the Compress PDF tool also has By compression level and By target file size. They turn each page into a compressed image, which is what makes the big drops possible on scans, and the trade-off is that text is no longer selectable. Keep the original for anything you need to search or copy from. If you have a specific limit, start from compressing a PDF to an exact size, from 100 KB to 10 MB.

What you have	Typical result
Scanned receipts or IDs	Often 50 to 90% smaller
Photo-heavy brochure	Often 40 to 75% smaller; keep 300 DPI if it will be printed
Text from Word or Google Docs	Often 10 to 30%, because text is already compact

These are typical ranges, not guarantees. Results depend on the images in your file.

Reduce PDF size FAQ

How do I reduce PDF file size without losing quality?

Shrink the images, not the text. Images are what make most PDFs large. Re-encode them at about 150 DPI for screen use or 300 DPI for print, and leave the text and vector graphics alone. In the free Compress PDF tool, the Keep text selectable mode does exactly that.

Will I still be able to search or copy text after reducing the size?

Yes with Keep text selectable, Mac Preview's Reduce File Size filter in most cases, and Word's Minimum size export, because they keep the text as text. No with the By compression level and By target file size modes of the tool, which turn each page into an image. Keep the original file either way.

Why did my PDF barely get smaller?

A PDF made mostly of text has little to shrink, because text is already compact. Files full of photos or scans shrink the most. If a PDF has no large images, delete or extract pages instead.

What is the fastest way to get under Gmail's 25 MB limit?

Reduce the images in the original file first. If it is still too big, remove pages you do not need or split the file into two attachments instead of shrinking the images further.

Next: if the PDF is still awkward to send, merge the pages you need first, then shrink it once. And if you are uneasy about online tools, read whether it is safe to convert a PDF online.