How do I compress a PDF online for free?

Upload your file, click Compress and Download, and the tool reduces PDF file size in your browser. This is a free online PDF compressor with no signup.

How much will my PDF be compressed?

Compression results vary depending on how the original PDF was created. Scanned, photo-heavy, or image-based PDFs usually shrink the most. Already optimized text PDFs may see little reduction.

Does compression reduce image quality?

It depends on the level. Balanced runs a light structure pass and keeps original quality. Strong applies full structure optimization and still keeps quality intact. Maximum may rebuild image-heavy pages as JPG with lower quality to produce the smallest possible file.

Is my file uploaded to a server?

No. Compression happens entirely in your browser using JavaScript. Your file stays on your device.

Why didn't my file get smaller?

Some PDFs are already well-optimized or mostly simple vector text. In that case, the tool keeps the smallest browser-generated version and tells you when it cannot shrink the file further.

Can I compress password-protected PDFs?

No. The PDF must be unlocked before compression. We plan to add a PDF unlock tool in a future update.

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Compress PDF

Compress PDF online to reduce PDF file size for email attachments, uploads, forms, and storage by rebuilding pages with compressed images directly in your browser.

Choose your PDFSelect one PDF file. Compression runs privately in your browser.

Compression level

Choose quality to calculate the compressed size before previewing or downloading.

Strong

Upload a PDF to compress.