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PDF-Komprimierer — Kostenloses Online-Tool

PDF-Dateigröße reduzieren bei gleichbleibender Qualität

PDF-Dateien komprimieren und Größe reduzieren. Browserbasiert, kein Server-Upload. Kostenlos, schnell, unbegrenzt.

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Free PDF compressor — shrink file size in your browser

Toololis PDF Compressor reduces PDF file size by stripping metadata and optimizing the PDF object structure. Fast, private, and browser-based. Best for shrinking PDFs for email attachments, cloud storage, or web upload limits.

How to use this tool

  1. 1

    Upload a PDF

    Drop your PDF or tap to browse. File size appears once loaded.

  2. 2

    Click Compress

    The tool strips metadata, unused objects, and optimizes compression streams. Works best on PDFs with bloated metadata or scanned images.

  3. 3

    Compare before and after

    The result shows original vs compressed size. Download if the savings are meaningful.

What this tool does

  • Removes metadata — Author, creation tool, edit history, timestamps
  • Removes unused objects — Orphaned resources, duplicate font subsets
  • Optimizes object streams — More compact PDF syntax
  • Preserves visual content — Nein image recompression, no quality loss

What this tool doesn\'t do

  • Resample / recompress embedded images (desktop tools do this)
  • Convert color → grayscale
  • Downsample fonts

For those, use Adobe Acrobat Pro, Ghostscript, or a dedicated online service.

Frequently Asked Questions

How much compression can I expect?
Typically 5–30% size reduction via metadata stripping and object compression. PDFs that are mostly scanned images can sometimes compress 40–60%. Pure text PDFs may not compress much — they're already small.
Why is browser-based PDF compression limited?
The biggest PDF bloat is uncompressed embedded images. Proper image recompression requires decoding, resizing, and re-encoding — which would take much longer than server-side tools. This tool focuses on safe, fast object-level optimization.
Will compression affect quality?
Nein visible quality loss from this tool. We don't resize or recompress images here — only remove metadata and optimize PDF structure. Your document remains pixel-identical.
Are my PDFs uploaded?
Nein. All processing happens in your browser. Perfect for confidential business documents, medical records, or financial statements.
What if the file gets bigger after compressing?
Rare but possible. If the original was heavily optimized already, pdf-lib's output might be slightly larger due to different object ordering. The tool warns you and you can keep the original.
For bigger savings, what should I do?
For serious compression (50%+), use desktop tools like Adobe Acrobat Pro (which resamples images to 150 DPI) or online services that do image resampling. This tool is fast and private — it trades max compression for never touching your data.

Wichtigste Punkte

  • PDF Compressor is a free, browser-based pdf tool — reduce pdf file size while keeping quality.
  • Nein signup, no downloads, no file uploads — your data stays on your device.
  • Works on desktop, tablet, and mobile. Install as a PWA for offline access.

How to Use PDF Compressor

  1. Open the tool: Launch PDF Compressor on Toololis — no account or download needed.
  2. Enter your data: Paste text, enter values, or select a file directly in your browser.
  3. Get instant results: Everything is processed locally — results appear immediately.
  4. Copy or download: Save your output or share it. Bookmark for quick access next time.

PDF Compressor — Quick Facts

Preis
Kostenlos — keine Limits, kein Wasserzeichen, keine Paywall
Privatsphäre
100% browser-basiert — keine Daten verlassen dein Gerät
Plattform
Jeder moderne Browser — Desktop, Tablet, Mobil
Kategorie
PDF Tools on Toololis
Offline
Works offline after first visit (Progressive Web App)
MerkmalDetails
ToolPDF Compressor
KategoriePDF
Anmeldung nötigNein
Datei-UploadKeine — wird im Browser verarbeitet
Mobile-UnterstützungVoll responsive
KostenFür immer kostenlos

Why Use PDF Compressor?

You should try PDF Compressor for a quick, private way to reduce pdf file size while keeping quality. All processing happens in your browser. Your files and data never leave your device. According to web.dev, client-side processing is the gold standard for privacy.

On the other hand, dedicated APIs or desktop tools suit batch processing better. They also handle server-side automation. For everyday tasks, browser tools offer the best speed, privacy, and convenience.

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100% Privatsphäre. Dieses Tool läuft komplett in deinem Browser. Deine Daten werden niemals auf einen Server hochgeladen.