Compress PDF Online
Choose your PDFs, select a compression level, and check the actual file sizes before downloading.
PDF files, up to 50MB each. No registration required. You can add more than one file.
PDF compression settings
Higher compression can reduce image detail. Keep the original and check important pages before using the result.
Selected PDF files are processed in your browser.
or drag and drop files here
Maximum file size: 50MB
Before submitting your PDF
Applications and portals: use the exact limit shown on your upload form. Leave some margin below it. Keep required pages, stamps and signatures legible; a compressed file does not guarantee acceptance.
Email: the attachment limit may apply to all attachments together. Check their combined size, or share a download link if the recipient accepts links.
Printing and archiving: start with the low level to preserve images. Keep the original and inspect the output before choosing stronger compression.
Higher compression can reduce image detail. Keep the original file and check important pages before submitting the result.
Compare the actual result
Review the original size and the result size for each file. If processing does not make a PDF smaller, Kompres keeps the original for download.
Open the downloaded PDF to check small text, signatures, stamps, and page order. A smaller file is not a guarantee that an upload form will accept it.
Choose a compression level
Low: keeps embedded images without re-encoding.
Medium: a starting point when you can accept some image compression.
High / Very high: stronger image compression can reduce fine detail or resolution.
Changing settings clears completed downloads. Process the original files again to compare another level. You can also select Target file size and enter 1 KB–50 MB; the tool tries up to four settings and reports whether the target is reached.
How to compress a PDF
- Choose one or more PDFs and select a compression level.
- Select Compress PDFs and wait for each file to finish.
- Compare sizes, download the result, and open it to check the pages.
Download completed files starts separate downloads for completed files. It does not create a ZIP archive.
When a PDF does not get smaller
Text-heavy PDFs and files that have already been optimized may have little room for further reduction. Keep the original if there is no useful saving.
Can I choose a target such as 200KB?
Yes. Select Target file size and choose 200 KB or enter your own limit. The target is not guaranteed. If it cannot be reached, the smallest available result is offered. Check the size and readability against your form’s requirements.
Can I use a protected PDF?
The current workflow does not unlock protected PDFs. Use a readable copy you are allowed to process.
Need a different file task?
Compress an image when your input is a photo. Combine JPG and PNG images into a PDF when you need one document.
For specific problems, read PDF attachments for email, job application upload checks, or scanned PDF readability.