Control the intensity
Adjust the slider for stronger image compression or more detail. Start with a moderate setting and increase it if your document is still too large.
Useful for scans and image-heavy reports.
Compress PDF Online
Compress PDFs for email, uploads and everyday sharing. Adjust image compression, choose a size in KB or MB, or set a target ratio.
or drop your PDF files here
Up to 10 PDFs · 100 MB per fileChoose a PDF to enable compression.
One free PDF per day for guests. Sign in for batch compression; each successful PDF uses 5 credits.
AirMore AI
Smaller documents. Easier sharing.
A scan, presentation or illustrated report can quickly grow into a PDF that is difficult to email or upload. Reduce its size before sending, without installing desktop software.
Add your files to one list, choose how to compress them and compare the result for each document. You stay in control of the trade-off between image detail and storage size.
Illustrative size comparison
Original PDF6.4 MB
Compressed PDF1.8 MB
Example only. Real results depend on the images, fonts and existing optimization in your PDF.
How to compress a PDF
From a list of files to smaller, ready-to-share PDFs.
Add files
Select one or more PDFs, or drag them into the list. Check the file names and add an opening password only where needed.
Choose your compression
Three ways to balance size and readability. Targets guide processing; they do not guarantee an exact result.
Download and review
Compare the sizes. Download one PDF directly, or download multiple completed PDFs together as a ZIP. Keep your originals until you have checked the results.
Choose the compression that fits your task
Three ways to balance size and readability. Targets guide processing; they do not guarantee an exact result.
Choose a size in KB or MB
Set a target such as 200 KB or 1 MB when a portal has a file size limit. The same target is applied to each selected document.
Useful for application forms and upload portals.
Keep a percentage of the original
Request a target size relative to each original. A 30% setting aims to keep 30% of the original bytes, rather than reduce the file by 30%.
Useful for files with different starting sizes.
A smaller PDF, with settings you control
One list. Individual results.
Signed-in members can add up to 10 PDFs with shared settings. Each document keeps its own status and download, so you can review completed files separately.
Choose the compression that fits your task
Three ways to balance size and readability. Targets guide processing; they do not guarantee an exact result.
See the actual savings
It is calculated from the actual bytes: (original size − output size) ÷ original size × 100. Some PDFs are already optimized and may not become smaller.
PDF
Made for everyday documents
Add your files to one list, choose how to compress them and compare the result for each document. You stay in control of the trade-off between image detail and storage size.
Email attachments
Reduce bulky reports and scanned documents before attaching them to an email.
Useful for scans and image-heavy reports.
Application uploads
Try a smaller PDF for upload portals. Check the downloaded size against the portal limit.
Useful for application forms and upload portals.
Study and work
Share lecture notes, presentations and reference documents with less storage overhead.
Useful for files with different starting sizes.
Check the details before you share
A smaller file is only useful if people can still read it. Open the compressed version and compare important pages with your original.
Check small text, stamps, signatures and fine lines at normal viewing size.
Check scanned pages and image-heavy sections before printing or submitting.
If the result is not smaller or the target was missed, adjust the settings or keep the original.
Frequently asked questions
Can I set a compression ratio?
Yes. Target size ratio specifies the desired remaining percentage of the original file. It is a target, not a guaranteed final size.
Will PDF compression affect quality?
A higher percentage compresses images more strongly and can reduce detail. This is an intensity setting, not a promised file size reduction. Check small text, stamps, signatures and fine lines at normal viewing size.
What PDFs are supported?
Upload one valid PDF within the displayed size limit. Damaged documents may fail. For password-protected files, enter the opening password.
Is PDF compression free?
One free PDF per day for guests. Sign in for batch compression; each successful PDF uses 5 credits.
Why is my file still large?
If the result is not smaller or the target was missed, adjust the settings or keep the original. Example only. Real results depend on the images, fonts and existing optimization in your PDF.
Does this process files locally?
No. Files are uploaded for server processing. Use only documents you are allowed to upload and download the result before its link expires.
Can I compress several PDFs together?
Yes. Signed-in members can add up to 10 files and use the same settings for the list. Each file has its own status, measured sizes and download link. Billing applies separately to successful files. Multiple completed PDFs can also be downloaded together as a ZIP.
How is the reduction percentage calculated?
It is calculated from the actual bytes: (original size − output size) ÷ original size × 100. Some PDFs are already optimized and may not become smaller.
Ready to lighten your next PDF?
Choose the files, pick your settings and see the actual savings.