PDF & Images
How to Compress a PDF
AllinOne Editorial · Published 2026-09-16
Honest compression: unused objects can drop. Already-optimized scans often will not get smaller — and might grow slightly.
Many “compress PDF” sites rasterize every page to a low-quality image. That shrinks scans and destroys selectable text. This site does not do that. It copies pages into a new document and saves with object streams — a lossless structural rebuild.
When it helps
- Exports with verbose metadata or unused objects.
- Files that were concatenated sloppily.
When it will not help
A phone scan that is already a compressed JPEG stream inside the PDF has little fat to cut. For those, compress the images first, then build a new PDF with JPG to PDF — understanding that you are making a new, lossy copy.
Always keep the original until you have opened the compressed file and checked the size.
Frequently asked questions
Why did my file get larger?+
Object streams can add structure. If the original was already tight, the rebuild can grow a little. Compare sizes before you replace the file.
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