Compress PDF without uploading
Shrink a PDF for email or forms without sending it to a compression website.
🚫 no upload
🌱 on-device
🆓 free
⚡ browser / Wasm
Searching “compress PDF” usually lands you on upload-based tools. That is fine for a flyer. It is a bad default for bank statements and contracts.
With GroundPDF you compress PDF without uploading: drop the file, run compression in the browser, download the smaller PDF. The original never leaves your device.
How to compress a PDF privately (steps)
- Open Compress PDF.
- Drop your PDF into the dropzone.
- Run compress and wait for the local engine.
- Download the result. Optionally check Network tab — no file upload.
When local compress helps most
- Email attachment size limits
- Government / school portals with max upload size (ironic, we know)
- Sharing a scan without re-photographing
Related: compress images without upload · merge without uploading.
FAQs
Will quality drop?
It depends on the PDF. Stream repacking and image-heavy files behave differently. Always spot-check important pages.
Is there a size limit?
Limits are your browser and device memory — not a daily server quota.
Is compress PDF free?
Yes on GroundPDF.
Is this offline?
After the tool and engine load, processing does not need to send the PDF anywhere.