PDF komprimieren online

What PDF komprimieren does

PDF komprimieren makes a PDF file smaller so it fits email attachment limits, upload forms and messaging apps. Large PDFs are usually large because of the photos and scanned pages inside them, so that is where the savings come from.

The tool decodes each large image in the document, scales it down if it is bigger than the chosen level allows, and encodes it again as JPEG with MozJPEG. The new image is used only if it is smaller than the old one. Then qpdf rewrites the file structure with maximum lossless compression. Text, fonts and vector graphics are not changed, so text stays selectable.

So verwenden Sie PDF komprimieren

1. Ziehen Sie die Dateien, die Sie verkleinern möchten, in das Feld.
2. Wählen Sie eine Komprimierungsstufe oder behalten Sie die empfohlene Einstellung bei.
3. Klicken Sie auf „Komprimieren“ und vergleichen Sie die alte und neue Dateigröße.
4. Laden Sie die verkleinerten Dateien herunter.

When to use PDF komprimieren

• Shrink a scanned contract or lease so it fits under the attachment size limit of your email service.
• Reduce a job application PDF with photos or certificates so an online portal with a small upload limit accepts it.
• Make a product catalog or portfolio full of photos lighter so clients can open it quickly on a phone.
• Compress scanned invoices and receipts before archiving them, to save space in cloud storage or an accounting system.

Settings explained

Light (best quality)

Keeps images up to 2400 pixels on the longest side at JPEG quality 80. For a full-page A4 scan that is about 200 DPI, which still prints well. Choose it when the file will be printed.

Recommended

The default. Limits images to 1700 pixels at quality 65, about 145 DPI for a full A4 page. Scanned text stays readable on screen and in normal office prints, and most files shrink noticeably.

Strong (smallest file)

Limits images to 1100 pixels at quality 45, about 95 DPI for a full A4 page. It suits reading on a screen or sending by chat, but small print in scans may become hard to read.

Was ist PDF?

PDF (Portable Document Format) ist ein Dokumentformat, das 1993 von Adobe eingeführt wurde. Dateien haben die Endung .pdf.

PDF was created by Adobe to show documents the same way on any device and printer. A PDF file describes pages with text, fonts, vector graphics and images at fixed positions. It became an open ISO standard in 2008, and there are special variants such as PDF/A for archiving and PDF/X for printing.

PDF is the right choice for documents that must look the same everywhere, such as contracts, invoices, forms, manuals, reports and files for printing. It also supports digital signatures, fillable forms, comments and password protection.

PDF is hard to edit, because text is stored as positioned pieces, not as flowing paragraphs. Converting a PDF to Word may change the layout. Scanned PDFs contain pictures of text, not real text, unless OCR has been applied.

All major web browsers open PDF files directly. Windows, macOS, iOS and most Android phones include a PDF viewer, and Adobe Acrobat Reader and many free apps can view, annotate and fill PDF forms on all platforms.

Warum „PDF komprimieren“ von FansBond?

Die meisten Online-Konverter laden Ihre Dateien auf ihre Server hoch. „PDF komprimieren“ von FansBond erledigt die Arbeit stattdessen direkt in Ihrem Browser – mit WebAssembly und modernen Browser-APIs. Ihre Dateien bleiben auf Ihrem Gerät. Das ist sicherer für private Fotos, Verträge und unveröffentlichte Projekte und oft auch schneller, weil nichts hoch- oder heruntergeladen werden muss.

Keine Warteschlangen, keine Wasserzeichen, kein Konto. Sobald die Seite geladen ist, funktioniert das Tool auch bei langsamer Verbindung weiter.

Tips for the best result

• If the result is not smaller than your file, you get your original file back unchanged. It keeps its original file name, so you can tell it apart from a compressed copy.
• Start with Recommended and open the result before you send it. If small text in a scan looks blurry, compress the original again with Light (best quality).
• Always compress the original file, not a copy that was already compressed. Each JPEG pass loses some detail, and a second pass rarely saves much more space.
• PDFs exported from Word or other text documents are usually small already. If such a file is large, it probably contains big photos, which this tool can shrink.

How PDF komprimieren works in your browser

The compressor looks at every image inside the PDF, decodes it, scales down images that are larger than needed and encodes them again at the quality level you chose. Text, fonts and vector drawings are left untouched.

After the images are replaced, qpdf rewrites the file structure with compressed object streams. If the result is not smaller than the original, you get the original back, so the tool never makes a file bigger.

Privacy and security

Most online converters upload your files to a server, process them there and keep a copy for some time. PDF komprimieren works differently: the code is downloaded to your browser once, and your files are read and written only on your device.

You can check this yourself: after the page has loaded, turn off your internet connection and the tool still works. This makes it safe for contracts, IDs, medical records, private photos and unreleased work.