Meet an upload limit
Create a smaller copy before submitting a form, application, invoice, or supporting packet to a portal with a strict file-size cap.
2 free per day. No watermark. Register for more.
Do the quick job here. Register only when you want history, saved files, repeat workflows, or a dashboard trail.
Compress PDF
Compress PDF files for easier sharing.
Create an optimized PDF for email, upload portals, mobile access, or storage. Choose a quality level, compare file sizes, and check important pages before sharing.
Reduce file size: shrink PDFs significantly while keeping documents readable and professional.
Faster sharing: smaller files upload, email, and transfer much more quickly.
Smart compression: maintains document quality even at aggressive reduction settings.
Drop a PDF here or choose a file
Drag your PDF here or click to browse. PDF files only.
Quality levels: High keeps best quality with less compression. Low reduces size aggressively. Try Medium first.
Save disk space
Significantly reduce file size while keeping your document readable and professional.
Share easily
Smaller files are faster to upload, email, or transfer across networks and platforms.
Quality preserved
Smart compression maintains document quality even at aggressive settings.
Practical guide
What is Compress PDF, and when should you use it?
Compress PDF rewrites and optimizes a PDF to reduce unnecessary data, making the file easier to email, upload, store, or open on a slower connection.
It is best for email attachments, application portals, document storage, and mobile sharing. Quick use does not require an account, although the current anonymous daily allowance may apply.
- Output
- A new optimized PDF; the original file on your device is not overwritten
- What it preserves
- PDF page order and readable content where supported; visual quality can vary
- Best for
- Email limits, upload limits, mobile access, and routine document storage
Common ways to use Compress PDF
Send a PDF by email
Reduce attachment weight when a client or collaborator needs the document but does not need the highest-resolution source images.
Store lightweight working copies
Keep an optimized delivery copy for routine access while retaining the original master when print quality or evidence matters.
How to use Compress PDF
Upload the large PDF
Select the file you need to send, upload, or store.
Choose a compression level
Balance smaller size against the image quality required for the document.
Compare and download
Check the reported sizes and inspect important pages before using the compressed copy.
Limits and checks before you use the result
- No compressor can promise the same reduction for every PDF. A file that is already optimized may become only slightly smaller or not smaller at all.
- Compression can affect scans, photos, fine diagrams, small text, signatures, stamps, barcodes, and QR codes. Inspect these elements at 100% zoom.
- Use the original master for print production, archival evidence, or any workflow that requires maximum image quality.
- If a portal specifies PDF/A, accessibility, digital-signature, or document-retention requirements, validate the compressed file before submission.
Compress PDF FAQ
How can I make a PDF file smaller?
Upload the PDF, choose a quality level, run compression, and compare the original and result sizes before downloading.
Will PDF compression reduce quality?
It can. The effect depends on the source file and chosen level, so check scans, small print, signatures, barcodes, and diagrams before sharing.
Why did my PDF size barely change?
The PDF may already use compressed images and optimized streams. Some files contain little redundant data, so further lossless optimization has limited effect.
Does compression change the original PDF?
No. The tool creates a new downloadable PDF and does not overwrite the source file stored on your device.
Can I compress a PDF without an account?
Yes, quick compression is available without signup, subject to the current anonymous daily allowance. An account is optional for saved history.
Understand the agreement before you sign it.
Review risky clauses in plain English, fix the document, and keep it moving toward signature.