File Size Limits
Since Favtoo processes files in your browser, file size limits depend on your device's available memory. The limits below ensure reliable processing across most devices.
| Category | Max Size | Notes | Tools |
|---|---|---|---|
| PDF Tools | 1024 MB | Per file. For merge, the total combined size should stay under this limit because all input PDFs are held in memory at once. | Compress PDF, Merge PDF, Split PDF, Rotate PDF, PDF to JPG, etc. |
| Image Tools | 512 MB | Per file. Very large RAW or panoramic images may be slow on mobile devices because the full bitmap is decoded in memory. | Compress Image, Resize Image, Convert Image, Crop Image, HEIC to JPG, etc. |
| Video Tools | 4096 MB | Per file. The first run downloads ~31 MB of FFmpeg WebAssembly from our static asset CDN; it is then stored in your browser's Cache Storage and reused by every video tool and workflow on subsequent runs (no re-download). 4K and very long clips may exceed your browser tab's memory. | Trim Video, Convert Video, Compress Video, Merge Video, Extract Audio, etc. |
| Audio Tools | 1024 MB | Per file. Lossless inputs (WAV, FLAC) hit the limit faster than compressed ones. The browser tab's memory is the actual ceiling. | Trim Audio, Convert Audio, Compress Audio, Merge Audio, Extract Audio, etc. |
| Text Tools | 10 MB | Text tools work with plain text. Very large files may cause browser slowdown but are not blocked at a fixed cap. | Word Counter, Case Converter, Text Diff, Lorem Ipsum Generator, etc. |
| Calculator Tools | N/A | Calculators do not process files. | BMI Calculator, Loan Calculator, Percentage Calculator, etc. |
| Developer Tools | 10 MB | For text-based input (JSON, Base64, etc.). | JSON Formatter, Base64 Encode/Decode, QR Code Generator, etc. |
| Web Tools | 10 MB | For text-based input (CSS, HTML, hashes, etc.). | Hash Generator, JWT Decoder, CSS Minifier, HTML Formatter, etc. |
| Batch Operations | 8192 MB | Combined upper bound for multi-file workflows. Individual files still need to fit one of the per-category limits above. | Workflows, batch image conversion, multi-file PDF merge, etc. |
Why Are There Limits?
Browser-based processing uses your device's RAM and CPU. Large files can exceed available memory, causing the browser tab to crash. Our limits are set conservatively to work reliably on most devices, including smartphones and tablets.
Per-tool limits may be lower
The numbers above are the category-wide ceilings enforced by Favtoo's file picker. Individual tools may set a lower cap when the operation is especially memory-hungry (for example, OCR on a long PDF, or up-scaling a large image). The picker on each tool page shows its specific limit before you select a file.
Tips for Large Files
- Close other browser tabs to free up memory
- Use a desktop or laptop instead of a mobile device for large files
- Split very large PDFs before processing
- For images, resize to a smaller resolution before applying other operations
- Chrome typically handles large files better than other browsers