Compress PDF
Shrink your PDF's file size in seconds โ 100% in your browser, never uploaded.
Drag & drop a PDF here, or click to choose. Everything runs in your browser โ your file is never uploaded.
Compression options
This free Compress PDF tool reduces your PDF's file size without uploading anything to a server โ every page is rendered and re-encoded right inside your browser, so your document stays completely private. Choose a compression level (Low, Recommended, or Strong) to trade quality for size, then see the exact before and after file sizes and the percentage saved. It works best on scanned or image-heavy PDFs, where it can dramatically shrink the file; for plain text PDFs the savings are smaller. There is no signup, no daily limit, and no file-size cap.
Frequently Asked Questions
How does this tool compress a PDF?
It re-renders each page to an image and re-encodes it as a compressed JPEG, then rebuilds a new PDF from those images. Stronger levels use a lower resolution and JPEG quality, which makes the file smaller. This is most effective on scanned or image-heavy PDFs.
Is my PDF uploaded to a server?
No. The entire process runs locally in your browser using your device's own resources. Your file never leaves your computer, so it stays fully private โ there is nothing to upload and nothing is stored.
Will the text in my PDF still be selectable after compressing?
No. Because each page is turned into an image, the text becomes part of that image and is no longer selectable or searchable. If you need the text to stay selectable, keep your original file or use a text-preserving optimizer instead.
Which compression level should I choose?
Recommended is a balanced default for most files. Choose Low if you want to keep image quality high with a smaller saving, or Strong for the smallest possible file at lower quality. You can re-run with a different level and compare the resulting sizes.
Why did my file get bigger or barely shrink?
Text-only or already-optimized PDFs gain little from rasterizing and can even grow, since converting crisp text into an image adds data. The tool tells you honestly when the result is not smaller and suggests a stronger level or keeping your original.
Is there a file size limit or signup?
No signup and no imposed file-size limit. The only practical limit is your device's memory, since large PDFs with many high-resolution pages take more time and RAM to render in the browser.
What types of PDFs compress best?
Scanned documents, photo-heavy brochures, and image-rich exports shrink the most because their pages are mostly pixels. Simple text documents already store text efficiently, so expect only modest savings on those.