— tool guide

PDF File Size Compressor

Reduce PDF file size in your browser. Compresses embedded images, removes metadata, and applies optimisations — no upload to any server. Download the smaller PDF instantly.

Open PDF File Size Compressor → free, no sign-in

— try it live open full screen ↗

— what it is

PDF files get large because they embed full-resolution images and accumulated metadata. This tool reduces PDF size by recompressing embedded images at a lower quality, stripping redundant metadata and annotations, and applying structure optimisations — all running locally in your browser using the pdf-lib library. No file is ever uploaded.

— what it does

✓Compress embedded images at adjustable quality (low, medium, high)
✓Strip XMP metadata and document info
✓Remove embedded thumbnails and unused objects
✓Shows original and compressed file size with reduction percentage
✓Download the compressed PDF immediately
✓No upload — runs entirely in your browser
✓Preserves document structure, text, and hyperlinks

— who it's for

→Anyone trying to get a PDF under an email attachment size limit
→Professionals compressing reports and presentations before sharing
→Developers reducing PDF assets for faster web delivery
→Students submitting documents under a university portal size limit

— how to use it

01 Open the PDF File Size Compressor

02 Upload your PDF by dropping it or clicking to browse

03 Choose a compression level (low, medium, or high image quality)

04 Click Compress — the tool processes the file

05 Review the before/after file sizes

06 Download the compressed PDF

— at a glance

Category	PDF Tools
Cost	Free
Sign-in required	No
Files uploaded	Never — runs in your browser
Published	May 11, 2026

— frequently asked questions

Is my PDF uploaded to a server?

No — everything runs in your browser. Your PDF never leaves your device.

How much can it reduce the file size?

Results depend on the content. Image-heavy PDFs typically see 30–70% reduction. Text-only PDFs may only shrink by 5–15%.

Will compression affect text quality?

No — text is vector-based in PDFs and is not affected by image compression. Only embedded images are recompressed.

Will it work on password-protected PDFs?

No — the tool cannot process encrypted PDFs. Remove the password protection first.

Is this free?

Yes — free with no sign-in.

— ready to use it?

Free, instant, no sign-in required. Opens directly in your browser.

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