Upload a PDF
Choose your PDF file from the device or drop it into the upload area.
Free online PDF tool
Compress PDF Online
Compress a PDF locally with QPDF WASM modes for lossless optimization, balanced compression or stronger image-aware reduction.
Browser ProcessingNo UploadPrivacy FirstLocal ConversionFast
Drop your PDF file here
Drop your file here or choose files. Upload one PDF file and rebuild it with safe client-side compression.
FreeSecureWorks in your browser
Compression strength
Choose a real QPDF compression mode. The result depends on how the PDF is built: image-heavy files usually shrink more than already optimized text PDFs.
These modes do not promise an exact target size and do not perform DPI-based downsampling. For exact 1 MB / 2 MB targets, LiftPDF would need a heavier rendering or image recompression engine.
Visual guide
What this tool does
Use the preview as a mental model: choose files, adjust only the settings that matter, then download the final document or image output. The workflow is designed to stay simple even with many pages.
Simple workflow
How it works
Preview and choose
Check the file summary, pages or options before starting the operation.
Choose compression strength
Compress PDF runs in the browser and prepares the new file locally.
Download a compressed PDF
Download the compressed PDF and compare original and final file sizes.
Practical reasons
Why use Compress PDF Online?
Keep the workflow simple
Optimize a PDF locally with QPDF WASM when you need a smaller browser-generated file.
Private by design
The workflow runs locally in your browser, which keeps everyday documents private and avoids an upload queue.
Works anywhere
Use the tool from modern desktop and mobile browsers without installing a PDF app.
Built for everyday files
Features
Browser processing
The file is processed on your device with client-side PDF libraries.
Clear preview
Review the file, pages or selected options before downloading the result.
No account required
Use the tool without sign-in, subscriptions or trial walls.
Responsive layout
The upload, options and download states remain usable on small screens.
Clean file names
Downloaded files use readable names instead of generic output.pdf labels.
Error messages
Invalid files, unsupported states and empty selections are reported clearly.
Perfect for
Common use cases
Students
Prepare class documents, notes and shared materials without desktop software.
Business
Handle receipts, contracts, reports and client documents in a quick browser workflow.
Administration
Prepare files for portals, email attachments and formal submissions.
Design review
Adjust visual documents, proofs or exported PDF pages before sharing them.
Personal documents
Work with tickets, scans, confirmations and archives from your own device.
Mobile tasks
Complete small PDF fixes from a phone or tablet when you are away from a computer.
Complete guide
Best practices before you convert
What browser compression can do
LiftPDF uses QPDF WASM to optimize streams, object structure and, in stronger modes, image compression where the engine can do so. The file still stays in the browser.
You can also remove standard PDF metadata during compression when privacy matters. The tool reports the real output size after compression and does not promise an exact 1 MB or 2 MB target because that would require a heavier downsampling loop.
Best results
Remove unnecessary pages before compressing and avoid converting high-resolution images into PDFs unless they are needed. The biggest file-size wins usually come from simplifying the source document.
Privacy comparison
LiftPDF vs typical online converters
TopicLiftPDFTypical converter
Browser processingFiles stay on your deviceUsually uploaded first
PrivacyNo document storageDepends on the provider
SpeedStarts immediately after selectionCan wait for upload queues
AccountNo account requiredOften limited by sign-in or trials
Keep working
Useful next tools
Compress PDF files online
LiftPDF compresses PDFs in your browser with QPDF WASM. Choose Preserve quality, Balanced or Strong compression, optionally remove document metadata, then compare the original and final file size before downloading.
FAQ
What compression modes are available?
LiftPDF provides Preserve quality, Balanced and Strong modes. Preserve quality focuses on lossless PDF optimization, while Balanced and Strong can optimize large images when QPDF can do so safely.
Does LiftPDF guarantee a target size like 1 MB?
No. The current browser engine does not guarantee exact target sizes. It reports the real output size after compression instead of promising a fixed number.
Will every PDF become smaller?
Not always. Some PDFs are already optimized, and LiftPDF will show a clear message when the rebuilt file is not smaller.
Does Compress PDF reduce image quality?
Preserve quality avoids intentional quality loss. Balanced and Strong may change image compression on image-heavy PDFs to reduce file size.
Can I remove PDF metadata while compressing?
Yes. Enable Remove document metadata to ask QPDF to remove standard PDF info and XMP metadata such as title, author, subject, keywords, creator and producer when it can do so safely.
Are my PDFs uploaded to a server?
No. Compression runs client-side in your browser with QPDF compiled to WebAssembly.
Can I compress a password-protected PDF?
Password-protected PDFs must be unlocked first. Use Unlock PDF, then compress the unlocked copy.
Learn more about this task
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Private by design
Your files stay in your browser
LiftPDF is built around local browser processing. For the available tools, files are read by your browser, processed on your device and downloaded back to you.
Browser Processing
The current tools process files in your browser using client-side PDF and image libraries.
No File Upload
Your selected documents do not need to be sent to a LiftPDF conversion server.
Private by Design
Sensitive files stay on your device during conversion, editing and export.
Secure Conversion
Protect and Unlock PDF use QPDF compiled to WebAssembly for local encryption tasks.
No server upload
How browser processing works
Your device
You choose files in your browser.
Local processing
PDF.js, pdf-lib or QPDF WASM runs the task locally.
Download
The result is created for you to save.
LiftPDF tools are designed so the selected files are read by the browser and processed on your device. The current tools do not require a document upload API.