How can I reduce PDF file size for email attachments?
Drag your PDF documents into the workspace and select Balanced compression. Click Start compression to reduce file size while keeping text and graphics crisp.
Files
Compress PDF
FreeLocal processingv1.2.0
Compress PDF files directly in your browser without uploading documents. Choose compression level, compare quality with zoom, and download PDF or ZIP.
About this app
Reduce the file size of your PDF documents easily and securely, right inside your web browser. No files are ever uploaded or transmitted across the Internet.
Select multiple PDF documents at once or drag and drop files directly onto the workspace. Adjust compression levels according to your needs: Lossless for structural cleanups, Balanced for everyday sharing, Maximum for aggressive downsizing, or Custom to dial in precise JPEG quality and image DPI.
Inspect your documents with side-by-side zoom comparison before saving. Verify text crispness, graphic sharpness, and image fidelity page by page.
Download processed files individually or package entire batches into a clean ZIP archive with clear byte-saving metrics.
Runs 100% locally on your smartphone, tablet, or computer. Your sensitive documents, contracts, invoices, and private reports never leave your device memory.
Features
Compress multiple PDF files in a single batch
Select several files at once. The app will process each document sequentially and allow downloading a combined ZIP archive with all compressed PDFs.
Downsize scanned PDFs and documents with heavy pictures
For scanned papers and photographic documents, choose Maximum compression or Custom with adjusted DPI to achieve dramatic size reductions.
Optimize PDF without reducing image quality
Choose Lossless compression. It removes redundant metadata, font subsets, and internal structural bloat without touching image pixels.
Compare PDF visual quality before and after
Click the eye icon on any processed document to inspect the original and compressed version side-by-side with high-resolution page zoom.
See exactly how much smaller your PDF became
Track real-time byte savings per file and total reduction percentage across your entire batch.
Frequently asked questions
Are my files sent to any server?
No. All PDF compression algorithms execute directly inside your browser memory. Your files are never uploaded.
Does compression preserve PDF quality?
Yes. Lossless compression preserves visual fidelity 100%, while Balanced and Maximum carefully downscale high-resolution photos without hurting text readability.
Can I compress a password-protected or digitally signed PDF?
Password-protected PDFs must be unlocked before compression. Digitally signed PDFs can be compressed, but modifying content may invalidate the cryptographic signature.
Why did my PDF barely shrink in size?
PDFs already compressed or composed purely of vector text and outlines contain little compressible image data. Use Lossless or Custom settings for fine control.
Does the app work without an internet connection?
Yes. Once loaded, Compress PDF works completely offline as a Progressive Web App.
What are the file size and page limits?
You can process batches of up to 200 pages and hundreds of megabytes depending on your device RAM.
Questions
No published answers yet.
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