Help / FAQ
Find answers to common questions, supported browsers, and file size limits. Privacy details are on a dedicated page.
Your files never leave this device
All processing happens entirely inside your browser — file contents, filenames, and metadata are never sent to any external server. You can verify this yourself using your browser's developer tools (Network tab). For details, see our Privacy Policy.
Frequently Asked Questions
- What does the name "OFFiler" mean?
- "OFF" carries two meanings: ① Offline — no server needed to process your files. ② Off-cloud — your files never leave your device. "Filer" means a file-processing tool. Put together, OFFiler is an offline, off-cloud file processor that keeps everything in your browser.
- Are my files sent to any server?
- No. All processing in OFFiler 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 OFFiler 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
How OFFiler handles your files and data — that is, never sending them anywhere — is explained in full on a dedicated page.
Read our Privacy Policy →Disclaimer
Service Provided As-Is
This service is provided "as is" without any warranty of accuracy, continuity, or fitness for a particular purpose.
Data Loss & File Corruption
The operator assumes no liability for file corruption, data loss, or processing failures that occur during in-browser processing. Always back up important files before use.
Service Changes & Termination
The operator may modify, suspend, or terminate the service at any time without prior notice. The operator is not liable for any damages resulting from such changes.
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 feedback, please use the form below.
Open Contact FormDeveloper site: picolasapp.com