Why are PDFs so large?
Scanned pages, high-resolution images and embedded fonts bloat PDFs fast — a 10-page scan can hit 50 MB, blowing past email attachment limits. Compressing a PDF re-encodes its images and strips waste, often cutting 70–90% of the size.
The fastest way: free online compression
Open the Compress PDF tool, drop your file, choose a quality level, and download the smaller version. It runs in your browser — no signup, no watermark, your document stays private.
How much can you compress without visible quality loss?
For screen viewing and normal printing, "medium" compression is visually identical to the original. Only go to maximum compression for draft sharing — fine text can soften. Always keep your original file, just in case.
Tips
- Compress before emailing, not after a failed send.
- Scanned PDFs compress the most (they are mostly images).
- If a portal still rejects it, split the PDF into parts.
- Text-based PDFs are already small — images are the real target.
Frequently asked questions
How do I compress a PDF for free?
Drop your PDF into a free compressor, pick a quality level, and download the smaller file. No signup or watermark.
Will compression ruin my PDF quality?
At medium settings the difference is invisible for screen and print. Maximum compression may soften fine text slightly.
Why is my PDF so big?
Usually embedded images and scans. Compression re-encodes images, which is where 70–90% of savings come from.
Is my document uploaded to a server?
No — BConvert compresses entirely in your browser, so private documents stay private.
Try it now
Ready? Compress your PDF free — no signup, private in-browser compression.