Compress PDF Online – Reduce PDF File Size
Compress a PDF online for free with ToolGuru. Shrink a PDF for sharing by redrawing pages as optimized images in your browser. No account, and files are not uploaded.
🔒 Your files are processed in your browser and are not uploaded.
Free PDF compressor online
Compress a PDF when the file is too large for email or an upload form. This size reducer redraws each page as a JPEG in your browser. You see the real original and compressed sizes — not a guess.
What this compressor can and cannot do
It works best on scans and photo-heavy PDFs. A small text PDF may not shrink, and pages become images so text is no longer selectable. If the result is larger, we keep the original and tell you.
Related tools
Remove extra pages first with the PDF Splitter, or combine files after compressing with the PDF Merger.
Common uses
Reduce PDF file size before an email attachment limit, shrink a PDF for a job portal, or compress a PDF online when a scan is too heavy. This is a PDF size reducer for sharing — not a print-quality studio tool.
Privacy
Your files are processed in your browser and are not uploaded. ToolGuru does not store your PDFs.
How to Compress a PDF
Step 1
Upload a PDF
Choose the file you want to make smaller. You’ll see the original size and page count.
Step 2
Pick a compression level
Recommended balances size and clarity. Strong and Maximum make a smaller file and may look softer.
Step 3
Compare real sizes
ToolGuru shows the actual original and compressed sizes. If the result is not smaller, the original is kept.
Frequently Asked Questions
How does this PDF compressor work?
It redraws each page as a JPEG and builds a new PDF. That reduces size for scans and photo-heavy files. Text may no longer be selectable. It is not a lossless optimizer for every PDF structure.
Will every PDF get smaller?
No. A text-only PDF that is already compact can end up larger after pages are turned into images. If that happens, we keep the original and tell you.
Do you promise a percentage reduction?
No. The sizes you see after compression are measured from the actual files, not an estimate.
Is the PDF compressor free?
Yes. Compress and download without an account.
Are my files uploaded?
No. Your files are processed in your browser and are not uploaded.
What if the PDF is password-protected?
Unlock it first. This tool does not bypass PDF passwords.