by OntiqoLeaf Viewer compared
How Leaf Viewer compares with other ways to open files without the program that made them.
| Feature | Leaf Viewer | File Viewer Plus | QuickLook | PowerToys Peek |
|---|---|---|---|---|
| Kinds of file it opens | 1,700+ | 400+ | 100+ | Not stated |
| Download size | 11–24 MB | 167 MB | 65 MB | 324 MB (part of PowerToys) |
| Outlook archives (PST) and mailboxes (MBOX) | Yes | No | No | Not stated |
| Maps and GPS tracks (KML, GeoJSON, GPX, shapefiles) | Yes | No | GPX, with a plugin | Not stated |
| Databases (Access, SQLite, Parquet) | Yes | No | SQLite and Parquet, with a plugin | SQLite |
| Apple Pages and Keynote | Yes | No | Not stated | Not stated |
| Evernote and other note apps | Yes | No | No | Not stated |
| Sheet music (MusicXML, MuseScore) and MIDI | Yes | No | MIDI, with a plugin | Not stated |
| Kindle and other e-books (AZW3, MOBI, FB2) | Yes | No | MOBI; FB2 with a plugin | Not stated |
| 3D models (glTF, USDZ, FBX, STL) | Yes | No | FBX and STL | Not stated |
| Building and engineering files (IFC, IGES, G-code, circuit boards) | Yes | No | No | Not stated |
| Science files (molecules, DNA sequences) | Yes | No | No | Not stated |
| Virtual disks (VMDK, VHDX, QCOW2) | Yes | No | No | Not stated |
| Web subtitles (VTT) and synced lyrics (LRC) | Yes | No | No | Not stated |
| Old Mac and DOS documents (ClarisWorks, WordPerfect) | Yes | No | No | Not stated |
| Can’t change, save or delete your files | Yes | No: edits, converts and deletes | Partly: a plugin edits Markdown | No: can delete |
| Nothing in a document can reach the internet | Yes | Not stated | Not stated | Not stated |
| Never runs macros or scripts in documents | Yes | Not stated | Not stated | Not stated |
Leaf is a reader by design: no Save, no Edit, and every document is rebuilt without anything that could reach the internet or run.
Checked against each product's own website and documentation, October 2026. Product names are trademarks of their owners. Something out of date? Tell us.