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FileLumo 旨在保持免费：无注册墙、无水印升级推销，并在此如实公布限制。本页说明各工具预期、Talk to PDF 限流方式，以及设备或网络带来的实际限制。
AI 助手免费，但设有速率限制以保障大家流畅使用。在浏览器中，每台设备大约可每小时发送 10 条消息（滚动窗口）。每个 PDF 或 Word 文件上传上限为 100 MB。服务端 API 调用另有短期防滥用保护。若达到上限，请等待计时重置，或稍后在稳定网络下重试。
批量数量反映当前 FileLumo 界面。文件大小行描述已文档化或客户端强制的上限；许多工具没有固定的 FileLumo 兆字节限制，但超大文件在慢速网络或低内存设备上仍可能失败。
| 工具 | 每次作业文件数 | 文件大小 | 说明 |
|---|---|---|---|
| PDF Merge | Up to 10 PDFs | No fixed FileLumo cap | Arrange order before merging |
| PDF Compress | 1 PDF per run (batch upload UI: up to 20 queued) | 50 MB per file (documented) | Server-side compression |
| PDF Split | 1 PDF | No fixed FileLumo cap | Extract pages or ranges |
| PDF Editor | 1 PDF | 40 MB (browser editor) | Runs mostly in your browser |
| Chat with PDF (AI) | 1 PDF or Word (.docx) per session | 100 MB | 10 AI messages per hour per browser (soft limit) |
| PDF to Word / Word to PDF | 1 file | No fixed FileLumo cap | See also /word-to-pdf |
| Fix Word Alignment | Up to 20 Word files | No fixed FileLumo cap | Expert alignment for body, bullets, headings, tables |
| JPG to PDF | Up to 50 images | No fixed FileLumo cap | Combined into one PDF |
| Image Compress | Up to 20 images | Exact KB mode: 5–5000 KB target | JPG, PNG, WebP, HEIC; quality or target_kb |
| HEIC to JPG | Up to 20 images | No fixed FileLumo cap | iPhone HEIC/HEIF to JPG |
| Remove Background | 1 image | Runs in your browser | JPG/PNG/WebP → transparent PNG; client-side model |
| Image to Text | 1 image | Runs in your browser | OCR English; copy or download .txt |
| Delete PDF Pages | 1 PDF | No fixed FileLumo cap | Page ranges like 2,4,7-9 |
| PDF Sign | 1 PDF | No fixed FileLumo cap | Draw or upload signature |
| Workflow Builder | Up to 15 files per pipeline step | Depends on each tool in the pipeline | Saved locally in your browser |
即便没有付费墙，超大 PDF、长扫描件或大量图片仍可能耗尽浏览器内存或触发网络超时。若作业失败，请改用 Wi‑Fi 而非移动数据，关闭占用高的标签页，先压缩扫描件，或在合并前拆分 PDF。 常见问题 涵盖常见错误信息。