What is the difference between compression levels?

Low re-packs the file structure without quality loss. Medium and High rasterize pages to JPEG at progressively lower quality — smaller file, less crisp.

Will text stay selectable after compression?

Only with the Low level. Medium and High rasterize pages, converting text to pixels.

Is there a file size limit?

No server limit — your browser's available memory is the only constraint. Very large PDFs may take a minute on Medium or High.

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convert / Komprimieren

Komprimieren

Größe durch Bild-Resampling reduzieren.

Fügen Sie mindestens ein PDF im Dateifach hinzu.

Weitere Tools entdecken

Methodik & Technische Transparenz

Verwendete Bibliotheken

pdf-lib — Kern-PDF-Konstruktions- und Bearbeitungslogik
pdf.js — PDF-Rendering und Seitenrasterung

Speicher-Strategie

Nach jeder Operation wird URL.revokeObjectURL() sofort aufgerufen. Alle pdf.js-Dokument-Handles werden über pdfDoc.destroy() gelöscht. Worker werden bei Abschluss oder Komponenten-Unmount beendet.

Wir garantieren keine dauerhafte Speicherung von Dateien (da wir diese nicht speichern). Die lokale Verarbeitung passwortgeschützter PDFs wird nicht unterstützt.

Key Features

Three compression levels
Low (lossless re-save), Medium (1.5× JPEG rasterization), and High (1× JPEG) — choose the right trade-off.
Size reduction stats
After compression, the tool shows original size, compressed size, and percentage saved.
Lossless option available
The Low level uses object-stream packing — text stays fully selectable and vector graphics are not degraded.

Common Use Cases

Valuable for shrinking PDFs before emailing (most services cap at 10–25 MB), uploading to document portals with size restrictions, or reducing storage footprint for archival.

Frequently Asked Questions

What is the difference between compression levels?: Low re-packs the file structure without quality loss. Medium and High rasterize pages to JPEG at progressively lower quality — smaller file, less crisp.
Will text stay selectable after compression?: Only with the Low level. Medium and High rasterize pages, converting text to pixels.
Is there a file size limit?: No server limit — your browser's available memory is the only constraint. Very large PDFs may take a minute on Medium or High.