Inspiring

Question

PDF file size bloated wildly

Forum|Forum|1 day ago
October 12, 2026
11 replies
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Emergency situation. I’ve had to delay publication because of a critical problem and my entire business depends on fixing it in the next two days or less.

Last year the on-screen-only PDF version topped out about 67 MB. Big but manageable. This year it’s over 165 Mb. This year was slightly bigger (a few more pages added but all vector animations and text). The size of the full .indd file went up from about 490 Mb to 692 MB. When I save-as it reduces to 386 until it’s opened.

Adding about a dozen vector images and text frames shouldn’t add 100 MB to a PDF, when downsampling is deeply constricted in size reduction (96/144, Medium resolution). I have an absolute ton of internal and external hyperlinks, cross-references and so on. Graphics aside from the cover are reasonably small for the most part, although there may be a handful that are a bit bigger.

What can I check and compress to make this a lot smaller? My hosting server will not allow a file that big, and I doubt my customers want a 160 Mb file on their phones and tablets either. My planned-weeks-ago book launch tonight was cancelled and I’m beyond panic right now.

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BobLevine

Community Expert

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PDF file size bloated wildly | Community

rob day

Community Expert

Hi @PeterD-NJ , Have you tried auditing the bloated PDF in AcrobatPro, as @CORCTON34033231 suggested? In Acrobat File > Save As Other > Optimize PDF… > Audit space usage...

Also, it could be an excess metadata problem, which would show in Document Overhead see these threads:

CORCTON34033231

Community Expert

Hi Peter — sorry you're dealing with this under a deadline. The fastest way forward is to find out where the megabytes actually are, rather than guessing:

1. Open this year's PDF in Acrobat Pro and open the PDF Optimizer (Save As Other > Optimized PDF, or Optimize PDF > Advanced Optimization). Click “Audit space usage” at the top — it breaks the file down by images, fonts, content streams, metadata and so on. Do the same for last year's 67 MB file and compare the two audits. The category that grew is the one to attack.

2. Things worth checking in InDesign before you re-export:

• Downsampling only shrinks raster images. Placed vector files (PDF/AI/EPS) pass their full contents through, including any large images embedded inside them — so check the actual file sizes of the new graphics, and their effective PPI in the Links panel.

• If the new pages use drop shadows or other transparency effects, Effects > Document Raster Effects Settings controls the resolution those effects are rendered at.

• In the Optimizer, subsetting embedded fonts and discarding metadata, attachments and deleted/unused content can also reclaim a surprising amount.

3. For the INDD itself: you already know Save As shrinks it. Exporting a copy to IDML and reopening it purges accumulated history data and often reduces both the INDD and the resulting PDF further — work on a copy, just in case.

Start with the audit comparison — once you know which category jumped since last year, the fix is usually straightforward. Good luck with the launch!

P

PeterD-NJAuthor

Inspiring

I did the compression audit and there were a bunch of .ai files whose hidden layers had mammoth sized images in them. I take a handful of stitched-together high-res map images from Google Earth, tile them in Illustrator, lock the layer then draw my map sketches over the top. I then hide the map layer in case I need to make revisions down the line, place the file in ID and that’s that. One of those files was well over 530Mb. So what I did was save that .ai file as a .PDF, stripped out the map layer and re-saved. That 530 MB file went down to 384k!!!

But that didn’t solve the problem. Not just that, but after saving the file twice and reopening it, the size remains at 689 Mb, despite the largest graphics (my covers) at 8-12 Mb and all the line art drawings at 500kb or less. And the PDF it generated was still a bloated 160ish MB abomination.

But the underlying problem was 14 graphics across 7 pages had been irretrievably corrupted during one of many InDesign crashes (they happen every few days). Tried copying from day-old backups and pasting in place, but no-go. InDesign was reporting the drwings were on the pasteboard but they were not. ID further reduced their size to 0% and locked them so they had no properties of any kind. But they were still linked.

The “solution” was to pay for a ChatGPT subscription; it actually wrote scripts for me and successfully found a way to re-place all the bad graphics. Not a fan of that method but here we are.

But then I found out that in the process another 30 or so pages were corrupted in an entirely different manor. The graphics are still there but ID shows them as being on the pasteboard and they are grayed out.

Here’s a sample of what I mean. I unchecked the content layer for this image.

Top spread is normal. Bottom is damaged. There are at least 20 of these spreads. Page numbers for the regular pages are normal, damaged ones show PB. They are NOT on the pasteboard!

Now the exact same view but with the content re-enabled:

My back up files are about 2 or 3 days old and in a pinch I could work from those but I”d lose a lot of small content changes that I’d made since then, including all the graphics that I’d reduced in size.

I am NOT exaggerating when I say this is my livlihood on the line. This file is my entire life’s work, researched and documented over the last 30 years and now revised annually. It should have gone to press overnight today and been released in PDF format overnight. I had to postpone my launch indefinately. I just don’t know what to do. At this point money is no object. I just need to fix it.

I have to wonder whether buying a Mac instead of trying to keep using a PC to work on this file would be a better solution. This is a powerhouse machine (Ryzen-7, 128 GB of DDR-5 RAM, 4TB of nVME storage, and a 6GB graphics card). I’m at my wits’ end.

rob day

Community Expert

Have you tried saving an IDML? Can you save and share a Package?

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