Compress PDF Online
Make your PDF smaller with real compression and honest before-and-after numbers. Processed locally in your browser — no uploads, no registration.
Drag & drop PDF files here
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Supports PDF files only • No file size limit
100% Private
Files never leave your browser
Honest Results
Real sizes, never fake savings
No Upload
Zero server dependency
Reduce PDF File Size Without Uploading
The compress PDF tool makes a PDF smaller so it's easier to email, upload to a marketplace portal or store. It runs entirely in your browser, so your document is never sent to a server.
The tool reports the real before and after sizes. If a file is already well optimised and cannot be made smaller at the level you picked, it says so plainly and hands back the original rather than a larger file labelled as compressed.
Which Compression Level Should You Use?
Maximum quality rewrites the document structure using object streams. Page content is untouched, so text stays selectable and vectors stay sharp. Savings are modest — typically useful on PDFs exported from older software, and close to zero on files that are already optimised.
Balanced and Strong compression re-render each page as an image at a lower resolution before rebuilding the PDF. This is where the large reductions come from, particularly on scanned documents and image-heavy invoices. The trade-off is real and stated up front: text in the output becomes part of the image, so it is no longer selectable or searchable.
When a PDF Cannot Be Compressed Further
Not every PDF can shrink. A file that is mostly plain text, or one that has already been through a compressor, may have nothing left to remove — and rasterising it can even make it bigger. When that happens the tool reports it honestly instead of showing a fake saving, and suggests trying a stronger level if that makes sense for your document.
Frequently Asked Questions
Is compressing a PDF online free?+
Yes. The compress PDF tool is free, requires no sign-up and adds no watermark to the output.
Are my files uploaded anywhere?+
No. Compression runs entirely in your browser, so the document never leaves your device.
Why did my PDF barely get smaller?+
Maximum quality only removes structural overhead, so a text-heavy or already-optimised PDF has little to save. Balanced or Strong compression re-renders pages as images and produces much larger reductions, especially on scanned documents.
Will the text still be selectable after compressing?+
With Maximum quality, yes — page content is untouched. Balanced and Strong compression convert pages to images, so text becomes part of the picture and is no longer selectable.
What if my PDF cannot be compressed?+
The tool tells you directly and offers the unchanged original for download instead of a file that is actually larger than what you started with.
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