Compress PDF

Client

Best-effort compression by re-saving in the browser—not a replacement for Smallpdf-style scan optimization. More PDF tools on the PDF hub.

About Compress PDF

Best-effort PDF shrink by re-saving in the browser—not server OCR or Ghostscript; see size before/after. The interactive transform on this page runs in your browser tab—Toolcore does not need your paste for the core operation described above.

How to use this page

Paste or type in the main workspace, run the primary action from the toolbar, then copy or download the result. Use Load example when the page offers it, or URL prefill (?q= / ?qb=) so agents and tickets open the same input.

Max 25 MB. Re-saves structure in-browser—not Ghostscript-level shrink for scans.

Nearby workflows on Toolcore

  • PDF watermark — Add diagonal text to every PDF page in the browser—download a labeled copy without upload. after you download or inspect a PDF on this page.
  • Merge PDF — Combine multiple PDF files in order—one download; processing stays in your browser. after you download or inspect a PDF on this page.
  • PDF info — Inspect page count, metadata, and encryption status—processing stays in your browser. after you download or inspect a PDF on this page.
  • Split PDF — Extract a page range or download one PDF per page—processing stays in your browser. after you download or inspect a PDF on this page.

Common use cases

  • Shrink mildly bloated exports before email attachments when a full desktop suite is unavailable.
  • Compare before/after file size after merging PDFs locally.
  • Quick pass on text-heavy PDFs where structure rewrite helps.

Common mistakes to avoid

  • Expecting scanned-page magic

    This tool does not rasterize or OCR scans—use dedicated desktop tools for image-heavy PDFs.

  • Password-locked PDFs

    Encrypted inputs may fail to load—unlock or re-export first.

FAQ

How much smaller will my PDF get?

Results vary. Text PDFs sometimes shrink; image-heavy files may stay similar size or grow slightly after rewrite.

Is the file uploaded?

No. pdf-lib runs entirely in your browser tab.

More tools

Related utilities you can open in another tab—mostly client-side.