PDF
PDF 压缩
在浏览器内把 PDF 页面重新渲染压缩，减少文件大小。
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关于这个工具
Drop a PDF, pick a quality and DPI, and the tool renders every page with PDF.js, re-encodes it as a JPG, and rebuilds a new PDF with pdf-lib — all in your browser. No upload, no signup.
Best for image-heavy or scanned PDFs, where compression delivers real savings (often 50-80% smaller). Vector-text-only PDFs may not shrink much because the rasterized JPGs still carry the same pixel area as the original vector strokes.
隐私说明
只要工具可以在浏览器内完成处理，源文件就不会上传到 PixWarp 服务器。处理过程在你的设备本地进行。
PixWarp 与上传型工具对比
| Feature | PixWarp | Upload tools |
|---|---|---|
| 文件隐私 | 尽量在浏览器本地处理 | 通常需要上传到服务器 |
| 账号要求 | 无需注册 | 可能要求登录或邮箱 |
| 水印 | 不加水印 | 免费版常带品牌水印 |
常见问题
- Does my PDF get uploaded?
- No. Compression happens entirely in your browser. Your file never leaves your device.
- Why is my text now an image?
- v1 compression rasterizes each page — vector text becomes a JPG. You lose copy-paste, search, and accessibility from the original. The trade-off is real, often-large size reduction. If you need to keep selectable text, don't compress aggressively or skip this tool.
- Which DPI and quality should I pick?
- 150 DPI + quality 75 is a good baseline — looks fine on screen and in most prints. For screen-only viewing, 120 DPI + quality 65 typically halves the file size again. For print-quality output, use 200+ DPI and quality 85+.
- What if the output is bigger than the original?
- Some PDFs (mostly vector, already optimized) get bigger when rasterized. The tool shows you the before/after — if it's bigger, just keep the original.