Compress PDF Online Free
Reduce PDF file size without quality loss. Runs in your browser. Great for reducing PDF file sizes before emailing, uploading to portals, or storing in the cloud.
Files processed in your browser — never uploaded to our serversClick or drag a PDF here
Single PDF file
Frequently Asked Questions
We re-encode the PDF structure using object stream compression. This reduces file size for many PDFs, especially those with redundant metadata or unoptimised object streams.
This tool compresses the PDF structure, not the embedded images. Image quality is preserved.
Some PDFs are already well-optimised. If images are the main size contributor, further reduction would require lossy image recompression.
No. Compression runs entirely in your browser. Your file never leaves your device.
Results vary depending on the PDF. Files with lots of redundant metadata or unoptimised object streams can shrink by 20–50%. Already-optimised PDFs may see little or no reduction.
No. This tool compresses the PDF document structure, not the text or fonts embedded inside it. All text remains fully readable and searchable after compression.
The most common causes are high-resolution embedded images, unoptimised object streams, embedded fonts, and redundant metadata. Image-heavy PDFs tend to have the most room for size reduction.
There is no strict limit, but very large files (100MB+) may be slow to process depending on your browser and device memory. We recommend files under 50MB for best performance.
Currently the tool compresses one file at a time. Compress the first file, download it, then upload the next one.
Zipping creates a compressed archive container but does not reduce the internal size of the PDF itself. PDF compression reduces the size of the file's internal structure, so the resulting PDF is smaller even without a ZIP wrapper — making it easier to email directly.