Compress PDFs to reduce file size. Strip metadata and optimize.
Upload a PDF file by dragging it into the zone or clicking to select.
Review the file name and page count displayed above.
Click "Compress PDF" to start the compression process.
Wait for the compression to complete. Processing happens in your browser.
Compare the original and compressed file sizes and the reduction percentage.
Download the compressed PDF if the size was reduced.
Clear and upload a new file to compress again if needed.
If the file is already optimized, try a different PDF or use a different tool.
A PDF compressor reduces the file size of a PDF by re-encoding its content and stripping unnecessary metadata.
Yes. Our PDF compressor is free. No signup or registration required.
Yes. Compression happens in your browser. Your files never leave your device.
The maximum file size is 50 MB.
The tool re-encodes the PDF structure and strips metadata like author, title, and creation date to reduce size.
Results vary depending on the PDF. Already-optimized files may not shrink further. The tool will display "Already optimized" in that case.
No. The compression preserves all pages, text, and images. Only metadata is removed.
The tool will show an "Already optimized" message if the file cannot be made smaller.
The result is a single compressed PDF file that you can download.
No. The tool runs in your browser. No installation or signup required.
For web sharing and email, use higher compression (smaller files). For printing or archival, use lower compression to preserve image quality and text sharpness.
Compress PDFs only after all edits are complete. Re-editing a compressed PDF and compressing again compounds quality loss, especially for embedded images.
Zoom into images and charts after compression to verify they remain readable. Compression aggressively targets images, which may become blurry at high compression levels.
PDFs often contain hidden metadata (author info, edit history, thumbnails) that bloats file size. Stripping this data can reduce file size significantly with zero visual impact.
PDFs with embedded fonts can be large. Subset fonts to include only the characters actually used in the document, rather than embedding the entire font file.
Always compare the original and compressed file sizes to verify meaningful reduction. If compression only saves 5-10%, the quality trade-off may not be worth it.
Compress images inside the PDF before creating the document. If you are generating PDFs from Word, InDesign, or similar software, reduce embedded image resolution to 150 DPI for screen viewing or 300 DPI for print. High-resolution images are the biggest contributor to large PDF file sizes.
When sharing PDFs by email, most providers limit attachments to 10-25 MB. Compress the PDF if it exceeds these limits. For very large files, use a cloud storage link (Google Drive, Dropbox) instead of an attachment.
For PDF documents intended for archival, use PDF/A format which is an ISO standard for long-term preservation. PDF/A embeds all fonts and color profiles, ensuring the document looks correct decades later regardless of software changes.
Flatten form fields and annotations before compressing PDFs that contain interactive elements. Flattening converts these elements to static content, which compresses better and ensures the document displays consistently across all PDF viewers.
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