Compress PDF
Optimize your PDF to reduce file size by removing redundant metadata and re-serialising the file structure — processed locally in your browser.
Runs in your browser — nothing is uploadedAbout Compress PDF
PDFs created by scanners, design tools and some word processors often carry extra data — duplicate objects, unused resources and metadata — that makes them larger than necessary. This tool rebuilds the PDF structure and removes that redundant data to reduce the file size, entirely in your browser.
Results depend on how the file was created. Text-based PDFs with lots of overhead can shrink noticeably, while files that are mostly high-resolution photos may change little, because the images themselves are kept at their original quality.
When to use it
- Getting under email attachment limits.
- Uploading to job, university or government portals with size caps.
- Saving storage space for archived documents.
- Sharing files faster on slow connections.
Tips for better results
- Compare the before and after sizes shown — if the saving is small, the file is probably image-heavy.
- For scanned documents, scan at 150–200 DPI in grayscale to create smaller files from the start.
- Split very large documents if a portal still rejects the file.
How to use the Compress PDF
- Drop your PDF.
- Click Optimize PDF.
- Compare the before and after sizes, then download.
Frequently asked questions
How much will the file shrink?
Results vary. PDFs with a lot of metadata overhead may shrink noticeably; PDFs with heavy embedded images will see minimal reduction because browser-side tools cannot re-compress image streams.
Is this the same as desktop PDF compression?
No. Professional tools like Acrobat can re-encode images at lower quality. Browser-side optimization is limited to structural cleanup.
Do I need to install anything?
No. It works in any modern browser on Windows, macOS, Linux, Android and iPhone. Processing uses your device, so very large files are faster on a computer than on an older phone.
Will compression make the text blurry?
No. This tool does not re-compress images or rasterise text, so the content looks exactly the same — only redundant file data is removed.