Compress PDF (basic re-save)
Re-save a PDF with a more compact structure and see the real size before and after. This basic compressor doesn't shrink the images inside, so scanned or photo-heavy PDFs barely change; it never claims a saving it didn't make, and keeps your original when nothing is gained.
How to use the Compress PDF (Basic)
- 1Drop the PDF you want to make smaller.
- 2Tap Compress PDF.
- 3Compare the size before and after: the saving shown is the real one.
- 4Download the smaller file. If it isn't smaller, keep your original: it's already compact.
Frequently asked questions
Why didn't my PDF get much smaller?
Most of a large PDF's size is usually its images, and this basic compressor doesn't re-compress them. It only rebuilds the file's structure (object streams), which helps PDFs made by some apps and office exports but not scans or photo-heavy files.
What does "basic compress (re-save)" actually do?
It reads the PDF and writes it again with its internal objects packed into compressed object streams. Text, fonts and images are left exactly as they were, so nothing looks different.
How can I make a scanned PDF smaller?
Scans need their images re-compressed, which this tool can't do yet (a stronger compressor is coming). Meanwhile, rescan at 150–200 DPI in greyscale, or compress the scanned images first and rebuild the PDF with Images to PDF.
Can compressing a PDF damage it?
The basic re-save only repacks the file's structure, so the pages stay the same. Your original file is never changed, and when re-saving wouldn't make it smaller, the tool tells you and doesn't offer a new file.
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