PDF compression shouldn't require signing up for a service that stores your files on their servers. ModernPDF reduces file sizes right in your browser — choose your compression...
Open Compress PDFStop creating accounts just to shrink a PDF.
Your PDF is compressed inside your browser. The file never touches any external server or API.
Choose between light, medium, and heavy compression. Preview the output size before downloading.
Local compression finishes before a server-based tool would even finish uploading your file.
Drop your file into the compressor or click to browse. The current file size is displayed immediately.
Choose a compression level based on your needs. Light preserves more quality; heavy minimizes file size.
Your compressed file is ready instantly. Check the new size and download when satisfied.
Most online compressors upload your document, process it on remote infrastructure, and send back the result. Your file passes through systems you can't inspect. ModernPDF skips all of that — compression runs locally via WebAssembly.
Free users get 3 compressions per day with files up to 10MB. That covers resumes, invoices, scanned forms, and most documents you'd need to email or upload to a portal.
Compressing a PDF before emailing it is one of the most common document tasks. It's also one that routinely exposes sensitive content — because most compression tools require uploading the full document to a server.
Tax returns, medical records, signed contracts, financial statements — these are exactly the documents that need compression for email, and exactly the documents that shouldn't be uploaded to third-party servers.
ModernPDF handles compression entirely in your browser. The WebAssembly engine optimizes images, removes redundant data, and restructures the PDF — all without the file ever leaving your device.
Results vary based on content. Image-heavy PDFs (scans, photos) typically compress 50-80%. Text-heavy PDFs with few images may compress 10-30%. The tool shows the output size before you download.
Light compression is nearly lossless — most people can't see a difference. Heavy compression visibly reduces image quality but produces much smaller files. Choose based on whether the PDF will be printed or viewed on screen.
In most cases, yes. If your PDF is image-heavy, heavy compression can usually get it under 1MB. For specific size targets, try our Compress to Under 1MB guide.
Yes. The output is a standard PDF file that opens in any reader. All text remains searchable, links remain clickable, and form fields stay interactive.
Scanned documents and image-heavy PDFs see the biggest reductions. PDFs created from PowerPoint slides also compress well. Pure text PDFs are already small and see modest improvements.
Free to start. Files stay on your device. Upgrade to Pro for unlimited use.
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