10 MB is one of the more generous limits you will meet, common on corporate email systems and many upload portals. Most documents, even fairly long or image-heavy ones, reach this comfortably on a single light compression pass, if they need any compression at all.
Steps
- Check the file's current size — many documents are already under 10 MB and need nothing further.
- If it is over, open the PDF Compressor and upload it.
- Start with a light compression level.
- Check the result; step up to medium only if light is not enough.
What typically requires action at this size
A document that is still over 10 MB after a light compression pass is usually either very long (well over 100 scanned pages) or contains several very high-resolution photos or illustrations. For most everyday documents — contracts, reports, applications — light compression is sufficient, and it is worth checking the size before assuming heavier compression is needed.
When 10 MB is still not enough
- Split the document with Split PDF if the recipient only needs a specific section, rather than the whole file.
- Re-scan at a lower resolution if you control the scanning step and the file is scan-heavy.
- Check for an unusually heavy single page — a print-resolution image embedded in an otherwise light document can be the majority of the total size on its own.
Why corporate email systems often use this exact limit
10 MB is a common default for corporate mail systems specifically because it balances practical everyday use against the aggregate storage and bandwidth cost of many employees sending attachments across a large organisation. If you regularly hit this limit sending routine documents from a work account, it is worth building a habit of a quick compression check before attaching, rather than only reacting after a bounce.
Keeping quality high given how generous this target is
Because 10 MB rarely requires more than a light pass, this is a good opportunity to prioritise keeping quality high rather than reaching for a stronger setting out of habit or caution. If light compression already gets you comfortably under 10 MB, there is no benefit to compressing further.
Combining several documents while staying under the limit
If you are attaching several files and the combined total needs to stay under 10 MB, compress any individually heavy files first, then merge them together if a single combined attachment is more appropriate than several separate ones, and check the final combined size before sending.
What this limit means in practical page-count terms
As a rough guide, 10 MB comfortably holds 100 or more scanned pages of plain text at a reasonable compression level, or a shorter document with dozens of photos or diagrams. Very few everyday documents genuinely need to exceed this, which is part of why it is such a common default limit across different systems.
What to do if you are regularly hitting this limit
If you find yourself needing to compress documents to fit 10 MB on a recurring basis, it is worth looking at the source of the size rather than treating compression as a permanent workaround each time. A scanning habit of using an unnecessarily high DPI, or a document template with an oversized embedded logo, are common repeat offenders — fixing the source means future documents are already close to the limit before you ever need to compress them.
Recognising when 10 MB genuinely is not achievable
Occasionally a document is simply too large for 10 MB to be realistic without unacceptable quality loss — typically a very long, fully scanned archive, or a document that is mostly high-resolution photography by design. In these cases, it is more productive to accept that the whole document will not fit, and instead ask whether the recipient genuinely needs everything, using Split PDF to send only the relevant portion, rather than repeatedly compressing the same file harder and harder in search of a number it was never realistically going to reach.
Frequently asked questions
Do most documents need compressing to reach 10 MB?
No, many are already comfortably under this size; always check before assuming compression is needed.
What compression level should I try first?
Light, given how generous this target is; only move to medium if light does not get you there.
Will my document's text stay selectable?
Yes, compression only affects embedded images; text is preserved exactly.
My file is a scanned 200-page document still over 10 MB at a strong setting. What now?
Consider whether the recipient needs the whole document, and use Split PDF to send just the relevant pages if not.
Is 10 MB a safe target for most email systems?
It is comfortably within most personal email limits and many corporate ones, though always check your specific recipient's stated limit if you know it.
Does merging several files make the total harder to predict?
Not really; the combined size is roughly the sum of the individual pieces.
Is the tool free and private?
Yes. No sign-up, no watermark, and files are removed from the server automatically about an hour after processing.