PDF Compressor

Large PDFs slow down email transfers, exceed attachment limits, and consume cloud storage quickly. A single high-resolution presentation can easily surpass 25 MB, forcing you to use file sharing services instead of a simple email attachment. Web publishers also feel the pain: every extra kilobyte increases page load time and mobile data usage for visitors.

Our free PDF compressor solves this by restructuring the document in your browser. It removes unnecessary metadata, cleans unused objects, and enables object streams so the same content takes less space, all without uploading files to a server.

PDF files can hold text, fonts, images, vector graphics, annotations, and metadata. Over time, documents accumulate extra information such as author name, creation software, and keyword tags that add no value to a final shareable file.

This compressor uses the pdf-lib library to discard surplus metadata, remove unreferenced objects, and save the document with object streams enabled. Object streams group multiple objects into one compressed stream, which is more efficient than storing each object separately. The result is a smaller PDF with identical page content and visual appearance.

1. Click the upload area or drag and drop a PDF file anywhere onto it.
2. Wait a moment while the tool reads and restructures the document in your browser.
3. Compare the original and compressed sizes shown in the result cards.
4. Click Download Compressed PDF to save the optimized file to your device.

No signup is required, and you can process as many files as you want. If you want to inspect the metadata that will be removed, try our PDF Metadata Editor first.

Email attachments: Compress reports so they fit under strict mailbox limits.

Web uploads: Smaller PDFs upload faster to job portals, grant applications, and learning management systems.

Cloud storage: Compress reports, invoices, and manuals to stretch free storage tiers and reduce sync time.

Sharing drafts: Send proposals and contracts quickly while keeping the layout pixel-perfect on every device.

Archival prep: Remove editing metadata before storing documents in long-term archives.

Imagine you have a 5.2 MB monthly sales report exported from a spreadsheet application. The file contains charts, tables, and embedded fonts, plus metadata naming the original author and creation software.

1. Upload the report to the compressor.
2. The tool removes the metadata and rewrites the object structure with object streams.
3. The result is 4.4 MB, a saving of roughly 15%, with identical charts and text.
4. You download report-compressed.pdf and attach it to an email that previously bounced because of the 5 MB limit.

Actual savings depend on how much redundant metadata and unused objects the file contains. Well-optimized PDFs may see smaller reductions, while exported documents with bloated metadata often shrink noticeably.

For the best balance of size and quality, check what is inside the PDF first. Text-heavy documents with embedded fonts compress well structurally. Image-heavy PDFs benefit more from reducing image resolution or switching to efficient JPEG compression before creating the PDF.

Keep an uncompressed original when archiving legally sensitive documents. Standards such as PDF/A may require embedded fonts and specific metadata to remain valid. After compression, open the file in a PDF reader to confirm every page renders correctly before deleting the source.

If you want to know how many pages your document has first, use our PDF Page Counter. To extract visuals for separate image compression, try the PDF to Image Converter.