Presets
Every conversion pair (source format → target format) ships with a small, curated set of presets. The server only accepts a preset ID that matches the source/target pair — arbitrary tool flags are rejected.
This keeps the matrix shallow but predictable, and ensures we never run untested combinations.
The full per-format preset list lives on the Formats page, generated at build time from the canonical matrix in packages/config.
What presets control
Presets are named bundles of parameters that map to the conversion engine's flags. They let you pick a quality/size tradeoff without needing to know sharp, ffmpeg, or LibreOffice internals.
Image presets
| Preset | Quality | Typical use |
|---|---|---|
web | q=82 | Web thumbnails, fast load |
high | q=92 | Print, archival |
lossless | Maximum | PNG→PNG re-encode or lossless WebP |
Images also support an optional resize parameter on the conversion. When the preset includes resize dimensions, the worker scales the image to fit within the given bounds while preserving aspect ratio.
Audio presets
| Preset | Parameters | Typical use |
|---|---|---|
standard | 44.1 kHz | General listening |
studio | 48 kHz | Production, post |
bitrate-128k | 128 kbps | Small file, MP3/AAC |
bitrate-192k | 192 kbps | Good quality, MP3/AAC |
bitrate-320k | 320 kbps | Max quality, MP3/AAC |
flac-compress | Compression level 5 | Lossless archival |
FLAC output and AAC/M4A targets are Pro-only.
Video presets
| Preset | Resolution | Codec | Typical use |
|---|---|---|---|
web | 720p | H.264 (NVENC if GPU available) | Quick web embed |
high | 1080p | H.264 (NVENC if GPU available) | High quality, larger file |
MOV and MKV targets are Pro-only.
Document presets
| Preset | Notes |
|---|---|
default | Standard conversion via LibreOffice or pandoc |
linearize | Post-process PDF with qpdf for fast web view (PDF target only) |
Rich Office formats (DOC, XLS, PPT and their variants) and 7z output are Pro-only.
Archive presets
| Preset | Compression | Notes |
|---|---|---|
fast | Quick | Smaller compression effort, larger output |
standard | Default | Balanced |
best | Maximum | Slowest, smallest output |
7z output is Pro-only. RAR is a read-only source format — you can convert a RAR archive to ZIP/TAR/7z, but you cannot create RAR output.
Preserve metadata
By default, all output metadata is stripped (EXIF, ID3, document author fields). Pro users can enable Preserve metadata per-conversion or globally in Settings. See Retention for the per-engine details.