ToolForgeby ForgeSparse

Compress PDF

Reduce PDF file size while keeping quality.

Upload a PDF

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Compress PDF files online

Compress PDF shrinks your PDF's internal file structure — reorganizing objects into compressed streams — to reduce file size while keeping every page exactly as it looks today.

Why use this tool

Lossless structural compression

Reduces file size by optimizing how the PDF's internal objects are stored — nothing visible changes.

Instant size comparison

See your original size, compressed size, and percentage saved immediately.

100% private

Your PDF is processed entirely in your browser — nothing is uploaded.

No quality loss

Unlike photo re-compression, this won't introduce visible artifacts into images or text.

How it works

  1. 1Upload your PDF.
  2. 2Click Compress.
  3. 3Download the smaller file.

Frequently asked questions

Good to know

  • This compresses the PDF's internal structure (object streams, cross-references) — it doesn't re-encode embedded photos.
  • Savings vary a lot by file: PDFs built from many small objects (e.g. exported from certain design tools) compress best.
  • Everything runs locally in your browser, nothing is uploaded.