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- HP Community
- Printers
- Scanning, Faxing, and Copying
- Mobile Fax - File Size Error

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04-24-2026 03:22 PM
I'm using the HP app trying to send a Mobile Fax. I've reduced my PDF file size to 15.7 MB and 36 pages. The app is giving me an error saying "Your file must be a total of 20 MB or less."
Help!
Solved! Go to Solution.
Accepted Solutions
04-24-2026 04:17 PM
Welcome to the HP Community --
Mobile Fax is Trial Software -- it's been in Trial Mode for a number of years.
-- For those reading --
The size and page limits are hard-coded in the application.
Said another way: There is not a method to bypass the limitations.
--------------------------
I do understand what you are saying --
- Your file size is less than the maximum allowed.
- You expect the application to work.
Mobile Fax generally works but might not accept your file.
The Mobile Fax TOS (Terms of Service) document says as much.
-- Reference --
Mobile Fax – Terms of Service
Scroll down to section 6. FAX SERVICE SET UP
Search the section for "Faxed Page"
------------------------------------------------------
Next,
The error message might be accurate in terms of what the application believes to be the problem -- the PDF file is too large.
OR
The error message might be the result of a problem but not one the application can correctly identify.
Said another way:
Something is wrong -- the application perhaps cannot or will not explain why the job tripped, failed, balked.
-- What to do? --
Try a smaller file / job to test whether Mobile Fax is working at all.
and / or
Perhaps split the PDF file into two smaller files.
-- Dragon Disclaimer --
I've not used this software --
The website does post clear and easy to understand Terms of Use and does provide a free online option.
Website
https://smallpdf.com/split-pdf
======================================
-- HP Smart / HP App - Mobile Fax –
Android, Apple iOS, iPadOS, macOS, and Windows 10, Windows 11
Not your home site? Click the Flag to change to your region.
Please do read the questions and answers in the FAQ section.
For example,
- What does the Mobile Fax service cost?
“More FAQs” calls this document – READ and Watch the Video
- HP printers - Using Mobile Fax (HP App)
- Note: Mobile Fax supports sending multiple PDF files at a time, up to 50 pages or 20 MB.
- Section “What are the Mobile Fax requirements?”
- Section for “What if a 'Delivery Failed' or an 'SFAPI' error displays?” (Error Codes)
Troubleshooting
Video Example
Mobile Fax – Terms of Service
------------------------------------------------------
-- Important –
Until and unless something changes, HP Mobile Fax does not (cannot) receive faxes.
--------------------------------------------------
Thank you for participating in the HP Community --
Real people who own, use, and support HP devices.
Click Yes to say Thank You !
Question / Concern Answered, Click my Post "Accept as Solution"
04-24-2026 04:17 PM
Welcome to the HP Community --
Mobile Fax is Trial Software -- it's been in Trial Mode for a number of years.
-- For those reading --
The size and page limits are hard-coded in the application.
Said another way: There is not a method to bypass the limitations.
--------------------------
I do understand what you are saying --
- Your file size is less than the maximum allowed.
- You expect the application to work.
Mobile Fax generally works but might not accept your file.
The Mobile Fax TOS (Terms of Service) document says as much.
-- Reference --
Mobile Fax – Terms of Service
Scroll down to section 6. FAX SERVICE SET UP
Search the section for "Faxed Page"
------------------------------------------------------
Next,
The error message might be accurate in terms of what the application believes to be the problem -- the PDF file is too large.
OR
The error message might be the result of a problem but not one the application can correctly identify.
Said another way:
Something is wrong -- the application perhaps cannot or will not explain why the job tripped, failed, balked.
-- What to do? --
Try a smaller file / job to test whether Mobile Fax is working at all.
and / or
Perhaps split the PDF file into two smaller files.
-- Dragon Disclaimer --
I've not used this software --
The website does post clear and easy to understand Terms of Use and does provide a free online option.
Website
https://smallpdf.com/split-pdf
======================================
-- HP Smart / HP App - Mobile Fax –
Android, Apple iOS, iPadOS, macOS, and Windows 10, Windows 11
Not your home site? Click the Flag to change to your region.
Please do read the questions and answers in the FAQ section.
For example,
- What does the Mobile Fax service cost?
“More FAQs” calls this document – READ and Watch the Video
- HP printers - Using Mobile Fax (HP App)
- Note: Mobile Fax supports sending multiple PDF files at a time, up to 50 pages or 20 MB.
- Section “What are the Mobile Fax requirements?”
- Section for “What if a 'Delivery Failed' or an 'SFAPI' error displays?” (Error Codes)
Troubleshooting
Video Example
Mobile Fax – Terms of Service
------------------------------------------------------
-- Important –
Until and unless something changes, HP Mobile Fax does not (cannot) receive faxes.
--------------------------------------------------
Thank you for participating in the HP Community --
Real people who own, use, and support HP devices.
Click Yes to say Thank You !
Question / Concern Answered, Click my Post "Accept as Solution"