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Libre Compresor de PDF

Comprime ficheiros PDF para reducir o seu tamaño. Sen perda de calidade, sen límite de tamaño de ficheiro.

Sen límite de tamaño de ficheiroOs ficheiros permanecen privadosNon é necesario iniciar sesiónLibre para sempre

Solta ficheiros aquí ou fai clic para buscar

PDF sen límite de tamaño de ficheiro

Explorar ficheiros

Os teus ficheiros nunca saen do teu dispositivo. Todo o procesamento realízase localmente no teu navegador.

💡 Scanned or image-heavy PDFs shrink the most with the image options. Text-only PDFs are usually already small — if nothing helps, we’ll tell you the file is already optimized rather than hand you a bigger one.

Optimize for your platform

Compress PDF for EmailCompress PDF for UploadCompress PDF for ArchivingCompress PDF for SharingCompress Legal PDF Documents

Como funciona

Most "free PDF compressor" sites silently upload your PDF to their servers. Here, compression happens entirely in your browser using pdf-lib — a popular JavaScript library that reads and rewrites PDF files locally.

  1. 1
    You drop a PDF
    The file is read into your browser's memory as a byte array. Nothing leaves your device.
  2. 2
    pdf-lib parses the PDF structure
    PDFs are essentially containers of fonts, images, and instructions. pdf-lib reads the structure and identifies which embedded images can be re-encoded at lower quality to reduce size.
  3. 3
    Images are re-encoded at your chosen quality
    You choose the quality level. Embedded JPEG images are re-encoded with that quality setting. The lower the quality, the smaller the output PDF — but text and vector content remain unchanged.
  4. 4
    A new PDF is written and offered for download
    pdf-lib reassembles the PDF with the compressed images and writes the result to a new in-memory file. Click Download to save it locally.

Safe for contracts, tax returns, medical records, anything sensitive. Your PDF and its contents never reach our server — there is no server in this workflow.

Por que usar o noso?

✓Completely free — no hidden costs, ever
✓No account, email, or login required
✓Files stay on your device — processing happens in your browser
✓Works on any device — phone, tablet, desktop
✓No watermarks on any output
✓Browser memory limits may apply for very large files

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Combina varios ficheiros PDF nun só. Arrastra para reordenar as páxinas.

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Imaxe a PDF

Converte imaxes a PDF. Reordena as páxinas, establece o tamaño e as marxes.

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PDF Redactor

Black out sensitive text in a PDF for good. Pages are flattened to images so the hidden content is permanently destroyed — not just covered. Runs entirely in your browser.

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