Guide
Reduce PDF size in the browser
Rewrite the file with compressed object streams so email and upload limits are easier to meet.
How to compress a PDF
Email systems and school portals often cap attachments at 10 or 25 MB. This tool re-saves the PDF using object streams, which can shrink documents that were exported without compression.
It is not a photo optimizer. A 40 MB file of full-page photos may only drop a little, because the pixels are already the bulk of the size. Vector text and line drawings usually benefit more.
Everything runs on your device. There is no “compress to 50 KB” guarantee. If a portal needs a tiny scan, photograph the page at a lower resolution and use JPG to PDF instead of expecting this rewriter to invent that reduction.
- Open Compress PDF and add the file that is too large to send.
- Click Compress PDF and wait for the progress line to finish.
- Download the new file and compare its size with the original in your file manager.
- If it is still too large, compress scans as images first, or split the PDF and send parts.
What compression can achieve
If size barely changes, the file is already lean or dominated by images. Then split it, lower scan DPI, or convert pages to JPG and rebuild a PDF from those images.
Always keep the original until you have opened the compressed copy. A rewrite should look the same; if a rare corrupted file fails, Repair PDF may help before you compress.
- Re-saves the PDF with object streams enabled.
- Keeps the same pages and reading order.
- Shows progress while the file is rewritten.
- Will not magically hit a 50 KB or 100 KB target on photo-heavy scans.
- Does not upload the file for server-side recompression.
Privacy when you compress a PDF
Compression reads the file locally and writes a new one for download. We do not keep a copy on a server.
Shrinking a file does not remove metadata or redacted-looking text that is still in the PDF. Use Redact PDF if you need content gone. Cookie use is explained in the Privacy Policy.
Frequently asked questions
Image-heavy scans and files that were already saved with object streams often cannot shrink much without lowering image quality, which this tool does not do.
No. This pass is a structural rewrite, not a JPEG quality picker. That keeps text sharp.
Most page content remains. Some interactive features can drop depending on how the original was built.