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Compress PDF

Email gateways and application portals often reject large PDFs. This compressor rebuilds your file locally to strip some excess structure. Gains vary: text-heavy files may shrink modestly; already-optimized or image-heavy PDFs may need image compression first.

Last reviewed July 30, 2026.

Drop a PDF to compress

Files stay on your device

Compression runs locally by rebuilding the PDF. Heavily image-based PDFs may need image compression first.

When to use this

  • Getting under a 10 MB or 25 MB email attachment limit
  • Uploading to a job or school portal with a strict size cap
  • Quickly rebuilding a PDF that was saved inefficiently

What to expect

A text statement might drop a noticeable amount after rebuild. A 40 MB scan of photos may barely move—compress those images first, then build a new PDF.

Common mistakes

  • Expecting miracles on already-compressed image PDFs
  • Confusing “compress” with “delete pages” (use Split for that)
  • Uploading sensitive PDFs to unknown online compressors when local processing is available

How it works

We load the PDF in-browser and re-save it with object streams enabled. That can reduce redundancy. It is not a lossy image recompressor—pair with the image compressor for photo-heavy files.

How to use

  1. Drop a PDF.
  2. Click Compress & download.
  3. Check the reported size change and retry with image tools if needed.

Related on this site

  • Image Compressor — Shrink JPG, PNG, and WebP file sizes with quality control. No upload.
  • Merge PDF — Combine multiple PDFs into one. Drag to reorder — files stay on your device.

FAQ

Will every PDF get much smaller?

Not always. Already-optimized files may shrink only a little. Image-heavy PDFs often benefit more from compressing images first.

Is quality reduced?

This pass focuses on structural recompression, not aggressively re-encoding every image at low quality.

Do you keep a copy of my file?

No. Work stays in your browser session.

What if the file is encrypted?

Unlock it first with an owner-authorized method, then compress.

Related tools

Merge PDF

Combine multiple PDFs into one. Drag to reorder — files stay on your device.

Split PDF

Extract page ranges from a PDF into a new file, privately in your browser.

Image to PDF

Turn JPG, PNG, or WebP images into a single PDF document.

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