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Kompres PDF

Compress PDFs without uploading them

Reduce PDF file size right inside your browser. Free, no account required, with up to 50 MB per file.

Your files are never uploaded to our servers — all compression happens right inside your browser

Drop your PDF files here

or pick several files at once from your device

Choose PDF files

How do I compress a PDF without uploading it?

  1. 1

    Add your files

    Drag PDFs into the drop zone or pick them from your device.

  2. 2

    Pick a compression level

    Choose your balance between quality and file size.

  3. 3

    Download

    Save files one by one or grab everything as a single ZIP.

Why compress a PDF in your browser?

Most online compressors upload your document to a server before anything happens. Kompres PDF works differently: the PDF parser and encoder run inside your own browser tab, so the file is read, re-encoded and rebuilt on your device. Nothing is transmitted, queued, or stored, which is why the tool is used for contracts, payslips, medical records, and identity documents.

Compression re-encodes the images and content streams inside the PDF at a lower resolution or quality. Scanned documents and photo-heavy brochures usually shrink by 40–80%, while text-only files save less because their content is already compact. Choose High Quality when fine detail matters, Balanced for email attachments, or Smallest Size when a portal enforces a hard cap. Each session accepts up to 10 files, 50 MB per file, and 200 pages per PDF.

Frequently asked questions

Are my files uploaded to a server?

No. Everything runs inside your browser using modern web technology. Your files never leave your device.

Is it really free?

Yes, completely free and no sign-up is required. Each session accepts up to 10 files, 50 MB per file, 100 MB in total, and 200 pages per PDF.

How much smaller will my PDF get?

It depends on the content. Scanned or image-heavy PDFs often shrink by 40–80%, while text-only PDFs shrink less.

Is there a file size limit?

50 MB per file, 10 files (100 MB) per session, and 200 pages per PDF. Files above those limits are rejected before compression starts.

Will quality suffer?

With High Quality the difference is barely visible. Smallest Size downsamples images more aggressively.

Sources & further reading

Standards, official documentation, and technical references behind the guidance on this page.