How much can I reduce a PDF file?

FileSwiftly typically reduces PDF size by 40-70% depending on content. A 5 MB PDF often becomes 1.5-2 MB on Recommended mode, and under 1 MB on Maximum mode.

Is there a file size limit?

The free tool supports PDF files up to 50 MB. FileSwiftly Pro supports files up to 500 MB with batch processing.

Is my PDF safe and private?

Yes. Your file is uploaded over HTTPS, processed on our secure servers, and automatically deleted after 1 hour. We never store or share your files.

Does compression reduce PDF quality?

In Recommended mode, the visual quality difference is imperceptible. Maximum mode reduces image resolution, ideal for email. Quality mode is for high-res printing.

Can I compress multiple PDFs at once?

Batch compression is available with FileSwiftly Pro. The free tool compresses one file at a time.

压缩 PDF

无明显质量损失地压缩PDF文件。免费、快速、安全。

~5–15秒平均压缩: 40–70% 1小时后自动删除 Max 50 MB

将您的PDF拖放到此处

或点击选择

仅限PDF — 最大 50 MB

压缩级别

最大

最小体积

实际效果

典型文件的实际压缩示例

前 / 后

4.8 MB

之前

1.9 MB

之后

60% 平均压缩率

60%

平均压缩率

平均时间

按模式压缩比

最大模式 −70至−80%

前

100%

后

25%

推荐模式 −55至−65%

前

100%

后

40%

质量模式 −30至−40%

前

100%

后

65%

"几秒内将PDF从4MB压缩到1.2MB，非常适合发送邮件！"

安全HTTPS连接

1小时后自动删除

每天处理50,000+文件

30秒内完成处理

How to compress a PDF online for free?

Compressing a PDF reduces file size by up to 70% with no visible quality loss. FileSwiftly uses Ghostscript, a professional PDF processing engine, to handle your files directly in the browser — no installation or account required.

Three PDF compression levels

Maximum mode shrinks the PDF to the smallest possible size by reducing embedded image resolution — perfect for email attachments. Recommended mode gives the best size/quality balance, ideal for web publishing and presentations. Quality mode applies light compression preserving high fidelity for professional printing.

Which PDF types can be compressed?

Our online PDF compressor supports all standard PDF files: reports, presentations, forms, brochures, eBooks, and invoices. PDFs containing high-resolution images benefit the most from compression. Text-only PDFs see moderate reduction since text is already efficiently encoded in the PDF format.

Security and privacy

Your PDF files are transferred over HTTPS encryption, processed in complete isolation on our secure servers, then automatically deleted after 1 hour. No data is retained, shared, or analysed. FileSwiftly is GDPR-compliant and requires no account.

FAQ

Why compress a PDF?

A compressed PDF downloads faster, fits email attachment limits, and uses less storage space — essential for documents shared online or via messaging apps.

Does compression reduce quality?

In Recommended mode the difference is imperceptible. In Maximum mode embedded images are downscaled, which is fine for screen viewing but not for professional printing.

What is the maximum PDF file size?

The free tool accepts PDFs up to 50 MB. FileSwiftly Pro supports files up to 500 MB with batch compression.

需要更多？

Pro版支持一次压缩12个PDF

批量处理支持500MB大文件 REST API访问

了解FileSwiftly Pro

★

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压缩 PDF

压缩级别

实际效果

How to compress a PDF online for free?

Three PDF compression levels

Which PDF types can be compressed?

Security and privacy

Avis & Notation

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