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Datatool360

Compress PDF Online

Make a PDF small enough to email or upload. The tool recompresses the pictures inside it, keeps one copy of anything stored twice, removes data that is not needed and packs the rest tighter. You can pick a level, or give a target size in MB. It all happens in your browser, so your file stays on your device.

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How to use Compress PDF

  1. Add one or more PDFs: click the upload area or drag the files onto it.
  2. Choose a compression level, or type a target size in MB. Open the sections below for finer settings.
  3. Press Compress PDF. One file is downloaded as a PDF, several files as a ZIP.
  4. Check the sizes shown next to each file. If a file cannot get smaller, the original is kept.

What you can do

  • Levels from Low to Maximum, or your own quality and resolution
  • Target size in MB: stronger settings are tried until the file is small enough
  • Lossless optimize mode that leaves pictures exactly as they are
  • Merges identical pictures and fonts, removes unused objects
  • Optional clean-up: thumbnails, application data, metadata, annotations
  • Several files at once, downloaded together as a ZIP
  • Private: the files never leave your browser

Frequently asked questions

Are my files uploaded?
No. Compression runs in your browser, so the PDFs are read and rewritten on your own device.
How much smaller will my PDF get?
It depends on what is inside. PDFs with large photos or scans shrink a lot. PDFs that are mostly text are already small and may shrink little or not at all. If the result would not be smaller, you get your original file back and the tool says so.
Does compressing change how the PDF looks?
Advanced compress lowers the quality and resolution of pictures, so photos can look slightly softer. Text and drawings are not changed. Lossless optimize leaves the pictures exactly as they are and only packs the file better.
How does the target size work?
The tool compresses, checks the size and, if the file is still too big, repeats with lower picture quality and resolution. If the target cannot be reached, it tells you the smallest size it got.
What does Rasterize do?
It turns every page into a picture. This can shrink scans a lot, but the text cannot be selected afterwards, so it is refused for PDFs that still have a text layer.
What about password protected PDFs?
They cannot be compressed as they are. If you know the password, unlock the file first with the Lock & Unlock PDF tool, then compress the unlocked copy.

Guides

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