Compress PDF Online Free — Reduce PDF Size
Make your PDF smaller by removing metadata and re-saving it cleanly. Honest results shown — free, no sign-up, files never leave your device.
✦ Free forever • No sign-up • No upload • No watermark
Compress PDF — Free, No Sign-Up
Choose one PDF file and press Compress. The tool shows the size before and after.
Honest note: this tool removes metadata and re-saves the file with compact object streams. It cannot shrink photos already inside the PDF. Typical savings are 0–20% — the tool always shows the real before/after size.
How to use Compress PDF
Choose your PDF
Click the box above or drop one PDF file onto it.
Press Compress
The tool removes metadata and re-saves the file with compact object streams.
Check the result
The tool shows the file size before and after. If nothing could be saved, it says so honestly — the file is still yours to download.
Example: Example: a 2.4 MB PDF with heavy metadata compresses to 2.1 MB (about 12% smaller). A PDF that is already compressed may not shrink at all — and the tool will tell you that.
About Compress PDF
Big PDFs are hard to email and slow to upload, so shrinking them matters — but many “compress PDF” tools promise miracles and deliver nothing. PDFTools is honest: it removes metadata and re-saves your file with compact object streams, then shows you the exact size before and after. If your PDF is already compressed, it says so plainly instead of pretending.
This works best on PDFs with metadata, unused objects or uncompressed structure. It cannot shrink photos already embedded in a PDF — for scanned or photo-heavy PDFs, convert PDF to Images, shrink the images, then use Images to PDF. There is no upload, so your document never leaves your device, and everything is free, with no account and no sign-up.
Frequently asked questions
How do I compress a PDF?
Choose your PDF and press “Compress PDF”. The tool removes metadata, re-saves the file, and shows the size before and after.
How much smaller will my PDF get?
It depends on the file. PDFs with heavy metadata can shrink 5–20%. PDFs that are already compressed may not shrink at all — and the tool tells you honestly when that happens.
Is compressing a PDF free?
Yes. Compressing PDFs on PDFTools is 100% free. There is no paid plan, no page limit and no watermark.
Do my PDF files get uploaded?
No. The compression happens entirely in your browser. Your files never leave your device and nothing is stored on any server.
Will compression change how my PDF looks?
No. Only metadata and file structure change. Text, images and layout stay exactly the same.
My PDF did not shrink. What can I do?
If your PDF is mostly scanned photos, convert it with PDF to Images, shrink the images, then rebuild it with Images to PDF. That is the honest way to shrink photo-heavy PDFs.
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