Compress PDF Online — Shrink Files Locally, No Upload
PDFMergeNext 的压缩工具在浏览器内对 PDF 重新序列化以减小体积——文件不上传，服务器无从获取你的内容。Compress PDFs right in your browser by re-serializing the file to shrink it. Nothing is uploaded; the server never sees your content.
适合邮件附件超限、网盘空间紧张时先瘦身再发送。Handy when an email attachment is too large or cloud storage is tight — shrink before you send.
操作步骤 / How it works
1. 选择 PDF / Choose a PDF
拖入或选择文件，本地解析。Drop or pick a PDF; parsed locally.
2. 点击压缩 / Click compress
浏览器在本地重新序列化 PDF，去除冗余对象、压缩交叉引用流。We re-serialize the PDF locally, trimming redundant objects.
3. 下载 / Download
生成体积更小的 PDF 并直接下载，无水印。Get a smaller PDF, downloaded locally, watermark-free.
常见问题 / FAQ
压缩 PDF 需要上传吗？
不需要。压缩在你的浏览器本地完成，文件不出设备。No. Compression runs locally in your browser.
能压小多少？
对文本型、含重复对象的 PDF 效果明显；对已经高度压缩的图片型扫描件提升有限——这是浏览器内本地处理的真实边界。Text-heavy and redundant PDFs shrink noticeably; already-compressed image scans have less headroom — an honest limit of in-browser processing.
会损失内容或清晰度吗？
不会。我们做的是重新打包而非重编码图像，页面内容与原分辨率都保留。No. We repackage, not re-encode; content and resolution are preserved.
压缩后还能再合并吗？
可以。压缩结果是标准 PDF，能用本工具继续合并或拆分。Yes — the result is a standard PDF you can merge or split again.