A scanned document or a PDF full of high-resolution images can easily hit a size that bounces off an email attachment limit. Compressing it usually solves the problem without needing to change the content at all.
Why PDFs Get Large
The biggest culprit is almost always embedded images — a scanned page saved at print resolution, or photos pasted in at full camera size, add up fast. Text itself takes up very little space by comparison.
Example
A 15-page scanned contract, saved directly from a scanner at high resolution, can easily come out around 12 MB. Compressed for on-screen reading rather than print, the same document typically drops to somewhere around 1.5–2.5 MB — small enough for almost any email attachment limit, with the text still fully readable.
How to Compress a PDF
- Upload the PDF to a free online compressor.
- Choose a compression level — a moderate setting keeps images visibly sharp while cutting file size significantly.
- Download the compressed file and open it to confirm the quality is still acceptable for its purpose.
A Practical Note
If the PDF needs to be printed at high quality later (not just viewed on screen), keep the original uncompressed file as well — compression is one-directional, and a heavily compressed file won't regain lost image detail.
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