Free PDF & Image Compressor Online

PDF Compressor Unlimited is a collection of document tools that run locally in the browser. You can reduce PDF file size, combine or extract pages, convert common formats, add signatures and watermarks, or protect a document without creating an account or sending the file to our servers.

Start with the job you need to finish

  • Compress PDF when an email, application form, or messaging service rejects a large attachment.
  • Merge PDF to put contracts, exhibits, receipts, or scanned pages into one ordered packet.
  • Split PDF to extract a page range or remove pages you do not need to share.
  • PDF to Word for editable text from a text-based PDF; scanned pages need OCR first.
  • PDF to JPG when a site or presentation needs page images instead of a document.
  • Protect PDF to add an opening password before sharing an ordinary confidential file.

How local processing works

After you choose a file, JavaScript and WebAssembly libraries read it inside the browser tab. Depending on the tool, pages may be copied into a new PDF, images may be resized and re-encoded, or text and page coordinates may be extracted. The finished file is created as a local browser download. The document itself is not posted to a conversion server.

What results should you expect?

Results depend on the source. A scanned PDF made from full-resolution photographs can often become much smaller because its images can be downsampled. A report exported from Word may already contain compact text streams and subsetted fonts, so there may be little safe compression left. Format conversion is similar: simple paragraphs usually transfer more cleanly than multi-column layouts, complex tables, interactive forms, or scanned pages.

No browser tool can guarantee a particular reduction or a pixel-perfect conversion for every PDF. PDF is a final-layout format, and files can contain encryption, embedded fonts, annotations, forms, unusual color spaces, and damaged objects. The tools report what they can process rather than uploading an unsupported document elsewhere.

A safe document workflow

  1. Keep the original file until you have checked the result.
  2. Choose the least destructive operation that solves the problem.
  3. Review the first and last pages plus signatures, tables, diagrams, and small text.
  4. Confirm page count, orientation, text selection, links, and form behavior when those features matter.
  5. Download the result to storage you control; refreshing the page clears the working session.

Privacy and device limits

Local processing avoids transferring document contents to this site, but it also means your device does the work. Large image-heavy PDFs can consume several times their saved size while pages are decoded. A desktop browser generally has more memory than a phone. If a large job stalls, close other tabs, try a smaller batch, or use a desktop rather than repeatedly lowering quality.

For detailed settings and realistic tradeoffs, use the PDF Compression Guide. The articles library also covers browser processing, security, accessibility, OCR, file structure, and long-term document handling.