Is my PDF uploaded to your server?

No. The PDF is processed locally in your browser using the pdf-lib library. Your document never leaves your device.

How much can this compressor reduce my PDF?

It depends on the PDF. Files with metadata, embedded fonts and older structures can shrink noticeably. PDFs that are already optimized may not change much.

Does this reduce image resolution inside the PDF?

No — this V1 preserves image content exactly and focuses on structural optimizations. For heavy image PDFs, consider reducing image resolution in your source document.

What about password-protected PDFs?

Password-protected PDFs cannot be processed. Remove the password first, then try again.

Free PDF Compressor — Shrink PDF Files Online

Compress PDFs privately in your browser

Zevqi re-saves your PDF using object streams and strips extraneous metadata, often producing a smaller file. Nothing is uploaded — your document stays on your device the entire time.

When to use this tool

Meeting an email attachment size limit
Uploading a form or invoice to a portal with a size cap
Cleaning up metadata before sharing a document

Frequently asked questions

About the PDF Compressor

PDF files grow large because of embedded images, fonts and inefficient internal structure. The PDF Compressor re-saves your document with an optimised structure, which can shrink files that were produced by older or less efficient software.

The PDF is processed locally with the pdf-lib library. It is never uploaded to a server.

How to use it

Drop your PDF onto the tool.
Wait a moment while it is re-saved with an optimised structure.
Compare the before and after sizes and download the new file.

Common uses

Getting a document under an email attachment limit.
Meeting a file size cap on a visa, tax or job application portal.
Stripping unnecessary metadata before sharing a file.

Tips for better results

Savings vary. PDFs exported by older tools or browsers often shrink noticeably; files from recent Word or Google Docs exports may barely change.
If your PDF is mostly scanned images, the biggest saving comes from re-exporting the scan at a lower resolution. Our guide on reducing PDF size walks through this.
If only part of the document is needed, use the PDF Splitter to extract those pages instead.

Good to know

Image content is preserved exactly, so image-heavy scans may not shrink much.
Password-protected PDFs cannot be processed. Remove the password first.

Built and maintained by Neha Singh. Found a problem or have a suggestion? Email hello@zevqi.com.