Best use case
Reduce upload, email and storage size while keeping the document readable for its destination.
Online PDF tool
Compress PDF Online
Fact-checked against current tool limits and output settings
Direct answerCompress PDF converts PDF input into a smaller PDF online. Upload the source, choose the required options, run the tool, and verify the downloaded result before using or sharing it.
Reduce upload, email and storage size while keeping the document readable for its destination. Upload PDF files and download a smaller PDF when processing is complete.
Online document tool
Choose files to compress pdf
Drop files here
Accepted: .pdf. Maximum files: 10.
Sign in is requested only when you submit the processing job.
Browser-based workflow
Compress PDF Online
Reduce upload, email and storage size while keeping the document readable for its destination.
The original file remains on your device unchanged. Download the processed result as a new file and review it before using it in a business, legal, publishing or records workflow.
Three steps
How to Use Compress PDF
- 01
Upload your files
Choose PDF files from your device and confirm that they are the correct source documents.
- 02
Start compress pdf
Submit the files to the Compress PDF workflow and wait for processing to finish.
- 03
Download and review
Download a smaller PDF, open it, and compare the result with the source before sharing it.
Workflow details
What Changes During Compress PDF?
Review the expected output, compatibility limits and quality considerations before using an optimized or repaired document.
- Accepts PDF input
- Creates a smaller PDF
- Supports up to 10 files per job
- Runs from a current web browser
- Uses HTTPS for file transfer
- Keeps the original file unchanged on your device
Before processing
File Reduction vs Document Quality
Quality check
Compare text, signatures, diagrams and image-heavy pages at 100% after compression.
PDFconver workflow
Why Use Compress PDF With PDFconver?
Secure transfer
Files are sent over HTTPS and each signed-in user can access only jobs associated with their account.
Clear data handling
Uploaded files are used to complete the requested job. Review our security and privacy pages before processing sensitive material.
No installation
Run the tool without downloading or maintaining desktop software.
Browser-based
Work from a current browser on desktop, tablet or mobile.
Clear limits
Submit up to 10 files and 25 MB combined per job.
Reviewable output
Download a separate result so you can compare it with the source before sharing.
Supported input and limits
Compress PDF Formats and Limits
| Accepted input | |
|---|---|
| Output | a smaller PDF |
| Files per job | Up to 10 |
| Combined upload size | Up to 25 MB |
| Platform | Current browsers on Windows, macOS, Linux, Android and iOS |
Encrypted, damaged, unusually complex or unsupported files may not process correctly. Keep the source file and inspect the downloaded result.
Troubleshooting
Common Compress PDF Problems
Why does the result look different?
Optimization and format conversion can change images, fonts or internal PDF objects. Compare important pages at 100%.
Why is the file still large?
Embedded images, fonts, attachments and already-compressed content can limit further size reduction.
Why did processing fail?
A damaged, encrypted or unusually structured PDF may not be readable by the selected workflow. Preserve the source and try a known-good file for comparison.
Will every PDF viewer open the result?
Viewer support varies by PDF feature and profile. Test the output in the applications used by your recipients.
Questions and answers
Compress PDF FAQ
What files can I use with Compress PDF?
This tool accepts PDF input. Select only files you are authorized to process.
What does Compress PDF create?
The completed workflow produces a smaller PDF for download and review.
What is the upload limit?
You can submit up to 10 files with a maximum combined size of 25 MB per job.
Do I need to install software?
No. The workflow runs in a current browser on Windows, macOS, Linux, Android and iOS.
What should I check after processing?
Open the download and compare its page count, content, formatting and intended behavior with the source before sharing or replacing an approved file.