Upload a PDF below to reduce its file size instantly. Use our free PDF compressor online to optimize your files directly inside your browser without uploading them to any external server.
Your PDF is processed locally in your browser and is not uploaded to our server.
Max 50 MB. Password-protected PDFs are not supported.
This optimizes the PDF's internal structure — it does not recompress embedded photos/scans, so a scanned or image-heavy PDF will only shrink modestly.
Compressed PDF
DownloadHow Our PDF Compressor Online Works — and Its Limits
This tool re-saves your PDF using a highly efficient internal object structure. Afterwards, it compresses cross-reference streams to reduce the total file size genuinely. Consequently, this method works exceptionally well for text-heavy PDFs, digital forms, and documents with many bookmarks or pages.
However, this PDF compressor online does not re-compress embedded photos or scanned images. If high-resolution images or scanned pages cause most of your file size, this structural method will only shrink it modestly. Consequently, reducing image resolution requires a fundamentally different operation. Therefore, you should always review your file details before compression.
If you need to edit or transform your documents further, you can also try our PDF to Word Converter or merge multiple files using our Merge PDF Tool.
FAQ
Why didn’t my PDF get much smaller?
If embedded photos or scanned pages take up most of your document space, our structural PDF compressor online won’t shrink the file drastically. Because it leaves image data untouched, it works best on text-heavy files and structured forms.
Will this reduce the visual quality of my PDF?
No — since this method doesn’t touch any images or text content, your PDF looks and reads exactly the same. Only its internal file structure is optimized.
Is my PDF uploaded anywhere?
No. The compression happens entirely in your browser. Your PDF is never uploaded to our server.