Сжать PDF

Reduce the file size of your PDF while maintaining optimal visual quality for uploads and email attachments.

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or drag and drop PDF here

Руководство по оптимизации: Механизмы сжатия PDF

PDF files can become bulky when they contain high-resolution images, embedded fonts, and complex vectors. Compressing a PDF involves optimizing these assets to reduce file size without compromising readability.

Lossless vs. Lossy PDF Optimization

PDF compression uses two main methods: lossless and lossy. Lossless compression shrinks text streams using algorithms like FlateDecode (Deflate). Lossy compression targets raster images embedded in the document, compressing JPEG data or downsampling images (e.g. from 300 DPI to 150 DPI) to dramatically reduce file sizes.

The Security Advantage of Local Compression

Because PDFs often contain financial statements or confidential records, uploading them to public cloud servers for compression poses privacy risks. DocumentAlter compresses PDFs directly in your browser, keeping your sensitive documents secure.

Как сжать PDF (Пошаговое руководство)

1

Import Target PDF File

Select or drag the PDF document you want to optimize into the compression area.

2

Configure Optimization Strength

Choose your compression level: Recommended (best quality/size ratio), Extreme (maximum size reduction), or Low.

3

Optimize and Download

Run the local optimization script to re-compress the document and download the smaller file.

Часто Задаваемые Вопросы

Перетащите файл в "Сжать PDF" на DocumentAlter, выберите режим сжатия и скачайте оптимизированный документ.

DocumentAlter применяет интеллектуальную оптимизацию, сохраняя четкость текста и графики и удаляя лишь избыточные метаданные.

Да. Все алгоритмы сжатия работают исключительно в песочнице вашего браузера, не отправляя документы через интернет.

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Compressing PDF

Compressing image resolutions...