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Help / FAQ
Find answers to common questions, supported browsers, file size limits, and our privacy policy.
Frequently Asked Questions
- Are my files sent to any server?
- No. All processing in LocalFileHub happens entirely inside your browser. Your file data is never sent to any external server.
- Can I use it without an internet connection?
- Yes. After installing LocalFileHub as a PWA (Progressive Web App), you can use it offline. Pages are cached on first visit.
- Where are the processed files saved?
- Processed files are saved to your local Downloads folder directly from the browser. Nothing is sent to a server.
- Is it free to use?
- Yes, all features are completely free. No account registration is required.
- Can I use it on a smartphone?
- Some features (such as video processing) are recommended on desktop Chrome/Edge. PDF, image, and text tools work on mobile browsers as well.
- Are there unsupported file formats?
- Each tool shows accepted file formats in the drop zone. Supported formats vary by tool.
Supported Browsers
| Browser | Support | Notes |
|---|---|---|
| Chrome（最新版） | ✅ Full support | Recommended |
| Edge（最新版） | ✅ Full support | Recommended |
| Firefox | ⚠️ Partial | Video processing & file save dialog not supported |
| Safari | ⚠️ Partial | Video processing & SharedArrayBuffer not supported |
File Size Limits
All processing occurs in browser memory. Files exceeding the limits cannot be processed.
| Category | Limit | Applicable tools |
|---|---|---|
| 100 MB | merge, compress, convert, etc. | |
| Image | 50 MB | JPEG, PNG, WebP, AVIF, etc. |
| Video | 1024 MB | MP4, WebM, etc. (Chrome/Edge only) |
| Text | No limit | text editor, JSON formatter, etc. |
Privacy Policy
File Data Handling
All uploaded files are processed exclusively in browser memory (or IndexedDB). File contents, metadata, and filenames are never sent to any external server.
Cookies & localStorage
We use localStorage to save your language preference, theme setting, and favorite tools. No tracking cookies are used.
Advertising
We may display advertisements via Google AdSense to sustain the service. Ad providers may use cookies.
Libraries & Licenses
| Library | Version | License | Usage |
|---|---|---|---|
| Next.js | 16.2 | MIT | Framework |
| React | 19.2 | MIT | UI library |
| Tailwind CSS | 4.2 | MIT | Styling |
| pdf-lib | 1.17 | MIT | PDF creation & editing |
| pdfjs-dist | 5.5 | Apache-2.0 | PDF rendering |
| @ffmpeg/ffmpeg | 0.12 | MIT | Video & audio processing |
| exifr | 7.1 | MIT | EXIF metadata reading |
| gifenc | 1.0 | MIT | Animated GIF encoding |
| fflate | 0.8 | MIT | ZIP compression |
| qrcode | 1.5 | MIT | QR code generation |
Contact & Feedback
For bug reports or feature requests, please use GitHub Issues.