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Compresser un PDF en ligne (gratuit)

Allégez vos PDF pour l’email et les envois tout en gardant une lecture lisible — le traitement se fait dans le navigateur.

Dans le navigateurSans inscriptionGratuit pour toujours

Utiliser l'outil

Importer un PDF à compresser

Drop your files here

Le résultat dépend du fichier — les PDF très image se compressent le mieux.

Workflow

Comment ça marche

Trois étapes rapides des entrées au résultat utilisable dans vos outils.

1

Étape 1

Importer un PDF (jusqu’à 30 Mo)

2

Étape 2

Choisir un mode et compresser localement dans le navigateur

3

Étape 3

Télécharger le PDF allégé

Pourquoi les équipes l'utilisent

Avantages et cas d'usage

  • Reduce upload failures on portals and email.
  • Speed up document sharing and storage.
  • Choose compression mode by use case.
  • Get size comparison instantly.
  • Download optimized PDF immediately.

Overview

Quick context

What does PDF compression do?

PDF compression reduces file size by optimizing visual content and rebuilding the document more efficiently. In browser-based workflows, this often means rendering pages and exporting with tuned quality settings. The goal is practical size reduction while preserving readability, not perfect lossless optimization for every PDF structure.

Why compress PDF files?

Many systems enforce file limits for uploads and email attachments. Large PDFs also slow sharing, syncing, and downloading. Compression helps teams send documents faster, reduce storage pressure, and improve portability for clients and partners. It is especially useful for image-heavy PDFs generated from scans, screenshots, and exported slides.

What affects PDF file size?

Image resolution and embedded graphics are usually the main factors. Scanned pages at high DPI, repeated images, and large visual assets can inflate size quickly. Text-first documents compress less dramatically. Compression mode selection matters too: stronger compression yields smaller files but may reduce image fidelity.

Réponses

FAQ

Can I compress PDF file online for free?

Yes. This tool is free to use and runs in-browser.

Is compression lossless?

Not always. Browser-based compression is practical and quality-aware, but not guaranteed fully lossless.

Which mode should I choose?

Use Recommended for most cases, Smaller file for strict limits, and Better quality for visual documents.

Why did my file not shrink much?

Text-dominant PDFs often have less compression potential than image-heavy files.

Is my file stored permanently?

The workflow is designed for session-based processing; downloaded output is saved locally on your device.

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