Why are my document scans so large After iOS 18 update?

I used the notes app to scan documents all the time. The pdf generated would normally be kilobytes, occasionally get into a mb or two. Ever since I updated to iOS 18, the files are huge, 40,50,60 mb or more. Even when I compress the file it’s still 5-10mb. Any idea why these scans are suddenly huge and what can I do to get it back to what it was?




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iPhone 15 Pro Max, iOS 18

Posted on Oct 23, 2024 5:04 AM

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Posted on Oct 23, 2024 6:21 PM

I think I found the difference. Everything is scanning in full color now. When I tried a 3 page test scan it came in at 4.4 MB. Then I found the Filters icon (three interlocking circles). When I changed it to Black & White it was 75 K, but looked awful. I changed ti to Grayscale and it was 631 K and look like it used to.


Try that and see what your milage is.

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77 replies

Jan 23, 2025 10:31 PM in response to Osfan93

I think I have found the solution: don't scan before sending to emails, do email then scan file then you will get much smaller size. So, go to email, new email, attach file (the scan icon one), after attached then write the content or either way.


But I prefer to scan first then send it to email to get file.


APPLE please fix it.

Jan 24, 2025 4:16 AM in response to Osfan93

I found solutions guys, if you need to scan document with colours and share it some messenger or email app for example:

  1. Use Files, not notes
  2. Choose some folder in Files and make scan documents
  3. Click "Share" but don't choose your app, choose "Print" and after that, in "Print" menu make sure it's A4 size and click "Share" from this print menu and now choose your app finally, so now you can send the image in the correct format.


Hello from Russian Programmers with love >_<


Nov 7, 2024 12:18 AM in response to Osfan93

Same here. I often use the notes app to scan documents. Sometimes I transfer those documents from icloud to windows.

In Windows I usually do a "Microsoft Print to PDF" from Acrobat Reader. Just did this with a ~24 Mb multi page document (A4 pages) which after Print to PDF was < 3 Mb.

In the Print Dialog however what I saw was that "Shrink oversized pages" was active. When I set it to "actual size" the frame to print was way smaller then the actual page size. Could have been almost A1! Well... selecting "Choose page size by PDF page source" would give a size of more than 8 x 11 inches - would be close to A0 then, wouldn't it? Why should a scan of an A4 page result in PDF pages in the size of posters?

Dec 8, 2024 7:43 AM in response to 6x6

I just tried this. Scanning in files is bad, but not as bad as scanning in Notes.

For me, prior to IOS 18, a 5-page document with color would take ~1-1.5 MB, and email easily.

Now, on same iPhone, scanning from Notes in default Color is >34MB, too large to email, and it takes several seconds to process.

Same scan from Files, in color, takes ~10MB.


So "Files" scan seems ~10 times bigger than previous Notes scanning, and "notes" scanning seems ~40 times larger.

Jan 9, 2025 9:36 AM in response to Osfan93

Check scans you might have saved from before the update, you should find they’re large also. The problem lies between notes and email I believe. Ie when you attach a scan to the email it should compress, that compression is happening intermittently at present.


I have updated iOS 18.2.1 (22C161) today and tested one Notes scan of 39.5mb, once attached to email 696kb.

Dec 25, 2024 7:27 AM in response to Osfan93

Same issue. I was totally foxed when I faced this issue today. Thanks for the posts here on the subject. At least I can do the work around by changing to greyscale, was not even aware of this feature till I read it here...This large size file is really a big issue, I had been doing this document scanning very frequently through Notes. Apple must fix this issue.

Jan 9, 2025 9:52 AM in response to Loudcloud

Check scans you might have saved from before the update, you might find they’re large also. I THINK the problem lies between notes and email. Ie when I attach a scan to the email it normally compresses, that compression is happening intermittently at present.


I have updated iOS 18.2.1 (22C161) today and tested one Notes scan of 39.5mb, once attached to email 696kb.


I use the term “I think”, because I’m not an Apple tech and can’t be sure. I do not have the resources to test this issue fully or correctly. Thought would’ve been obvious, no?


This isn’t my fault, I didn’t write the SW for this issue.

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Why are my document scans so large After iOS 18 update?

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