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Compress PDF Files Online
Process a PDF to try to reduce its file size for sharing or uploading. Compare the result with the original because compression depends on how the source document was created.
Active conversion station
Compress PDF
Reduce PDF file size
How to reduce a PDF file size
Prepare the source
Select the PDF documents you want to compress.
Review the settings
Review the available compression setting.
Check the result
Start Conversion, compare file sizes and check text and image readability.
Supported formats and limitations
Input: PDF. Output: PDF. Already optimized PDFs may not shrink. Processing can fall back to image downsampling, so do not assume every compression mode is lossless.
Processing runs on the server after you select Start Conversion. The interface accepts files up to 500 MB; service and connection limits can be lower. No installation or account is required. Read our file processing privacy policy.
Why Use ConvertFast's Compress PDF?
- Optimize PDF storage and, where available, image content.
- Compress multiple PDFs as separate outputs.
Frequently Asked Questions
Why is the compressed PDF not smaller?
The original may already be efficiently compressed or contain little reducible image data. Keep whichever version best meets your needs.
Will images keep exactly the same quality?
Not necessarily. Available server compression paths can reduce image detail. Compare important pages with the original.
Ready? It's Free.
No account required. Input rules appear before you upload.
Open Compress PDF Tool