PDF SIZE GUIDE
How to compress a PDF for an upload size limit
When a portal rejects a PDF for being too large, treat its number as a maximum unless the portal explicitly says otherwise. Enter that maximum, create the PDF, then check the actual generated size rather than assuming a compression setting succeeded.
Maximum size is not the same as exact size
If a portal says maximum 500 KB, then a 486 KB result is within that size rule while 501 KB is not. PDF Ready does not add meaningless padding to make a file land exactly on 500 KB.
Numbers such as 500 KB, 1 MB and 2 MB are examples of user-entered limits, not universal standards. Always use the value shown by the destination you are submitting to.
Illustrative example: 2.8 MB original → maximum 500 KB
This is an example only, not a claim about any particular portal.
Keep this source file unchanged.
Generate and measure the actual output.
Within the illustrative maximum.
PDF Ready starts with preserve-first output
Existing imported PDF pages are preserved first where possible. That matters because immediately rasterizing every PDF page would discard useful document characteristics for no reason.
If the workspace also contains image inputs and a maximum is active, PDF Ready may try bounded image-optimization profiles for those image pages while keeping existing PDF pages preserved.
Stronger PDF optimization is an explicit escalation
When a maximum still cannot be reached and the document contains imported PDF pages, PDF Ready can offer Allow stronger PDF optimization. It is not silently enabled.
If you opt in and generate again, existing PDF pages may be rasterized or flattened to images. That can reduce size, but text may no longer be selectable and advanced PDF features may not survive. Treat stronger optimization as a tradeoff, not a free improvement.
Why a very small target may be unreachable
- Many pages: every page still needs enough data to remain usable.
- Image-heavy scans: scanned pages can require substantial raster data.
- Already-compressed content: there may be little safe reduction left.
- Safe quality floor: PDF Ready stops bounded optimization rather than degrading indefinitely.
These are practical reasons, not a promise about every possible PDF's internals.
The generated bytes decide whether the maximum passed
PDF Ready validates the actual output byte length after generation. For size calculations, 1 KB = 1024 bytes. A UI estimate is not substituted for the serialized PDF that will be downloaded.
If the actual result remains over the maximum, the result stays Not ready yet. The tool does not report success merely because it tried a smaller profile.
Keep the original PDF
Compression and especially stronger flattening can be lossy. Keep the source file so you can make a different submission copy later, recover selectable text, or use the original if the destination changes its requirements.