EN
HUText and hex
Text files of any size with syntax colouring, a hex view, encodings, line numbers, and search for text or bytes.
File viewers
Look inside any file without leaving the panel.
F3 opens the file under the cursor in a read-only viewer built for its type — Markdown rendered GitHub-style, an SQLite database, a ZIP archive, a manual page. A file no special viewer understands opens as text and hex, so F3 always shows something.
Step by step
Open, step through, close
It works the same for files on your Mac, in a cloud account, on a server or inside an archive. Remote files are downloaded first and kept in the file cache, so opening them again is quick.
Press F3
Put the cursor on a file and press F3 (File ▸ View File, or View in the command bar). DriveManager picks the viewer by the file’s type, in its own window.
Step through the folder
N and P (or ⌥→ and ⌥←) show the next and previous file in the same window; in the image viewer ← and → do it too. Opened on a marked file, the viewer walks through the marked files only.
Switch the view
Markdown, HTML, SVG and manual pages have a Preview and a Source tab; in the text viewer H switches to hex. ⌘F finds, ⌘+ and ⌘− zoom, in every viewer.
Close, or keep it open
Esc, F3 or ⌘W closes the window and the panel’s cursor sits on the last file you saw. Every F3 opens a new window, so several files can stay open side by side.
Markdown preview on your Mac
Markdown is rendered the way GitHub does it — headings, tables, task lists, code blocks — with a Source tab beside it. HTML pages open the same way, in a locked-down view.
- An Outline of the headings on the left; click one to jump there
- For a file on your Mac the preview updates by itself whenever you save, so it can stay open beside your editor
- Code blocks are syntax coloured, with Wrap and Copy buttons
- Find highlights every match and counts them, for example “3 of 17”
- Nothing loads from the internet until you allow it, and HTML scripts stay off unless you turn them on
Photos and pictures
JPEG, PNG, HEIC, GIF, TIFF, WebP, camera RAW and every other format macOS can decode. The next image is prepared while you look at the current one, so stepping through a folder of photos is quick.
- The info panel (I): a Summary with dimensions, camera, lens, exposure and colour profile, and every EXIF field; location data isn’t shown
- Animated GIF, PNG and WebP play; Space pauses
- SVG drawings are redrawn sharp at every zoom, without scripts or network access
PDF documents
Pages scroll continuously, and documents with hundreds of pages open at once. The viewer is read-only: forms show but can’t be filled in, and nothing in the file changes.
- Page thumbnails (T) in a sidebar; ← and → turn the pages
- Find with a match count, and copy text unless the PDF forbids it
- Password-protected PDFs ask for the password, which is never stored
Archives, browsed like folders
Press Return on a ZIP, tar, 7z, RAR, ISO or other archive and it opens right in the panel: move into its folders, view files and copy them out without unpacking first. F3 on it opens the archive viewer instead.
- The archive viewer shows the whole tree with sizes, packed sizes, compression and encryption, and a summary of the archive
- Filter by a mask such as *.jpg; *.png, and extract the whole archive or only the selected items
- Open as Archive looks inside .jar, .apk, .docx, .epub and other files that are ZIP archives under another name
SQLite and CSV, as tables
An SQLite file viewer and a spreadsheet grid for CSV, both for files with millions of rows.
SQLite databases
Tables, views, indexes and triggers with row counts, the structure, an SQL editor and database details. It opens read-only; Edit mode collects your changes and saves them in one transaction.
CSV and TSV files
An Excel-style grid with frozen headers: sort, filter, Go to Cell, and Sum, Average, Min and Max of the selection. Delimiter, encoding and header row are detected for you.
Developer formats
F1 on a command-line program opens its manual page, typeset for reading with coloured options and working links; Help ▸ Search Manual Pages… searches every page on your Mac by name or description.
- JSON, XML and YAML: a syntax check, a tree, and minified files shown neatly formatted without changing them
- Apps and binaries: versions, architectures, linked libraries, code signatures, entitlements and symbols, without running anything
- Property lists of every kind, and what Finder keeps in .DS_Store files
- Disk images and installer packages, without mounting or installing them
And the rest
Each family has its own viewer, and Settings ▸ Viewer decides which file extensions each one opens.
Video and audio
Audio tracks, subtitles and chapters; cover art, tags and lyrics for music; an Info tab with every stream’s details.
E-books
EPUB, Kindle and Palm books with a table of contents, reading themes and fonts, and they open where you left off.
SID tunes, torrents, certificates
Commodore 64 music with an emulated sound chip; .torrent files without any network traffic; .p12 and .pfx files without touching your Keychain.
Built-in viewers
- Text and hex, any size, with syntax colouring
- JSON, XML and YAML: syntax check and tree
- Images, with zoom, animation and EXIF
- SVG drawings, sharp at every zoom
- Video: what macOS plays, plus MKV, WebM and more through FFmpeg
- Audio: MP3, FLAC, AAC, Ogg, Opus and more, with cover art, tags and lyrics
- SID tunes of the Commodore 64
- Markdown, GitHub style
- HTML, sandboxed
- E-books: EPUB, Kindle (MOBI, AZW3) and Palm
- Google Docs, Sheets and Slides, live or as PDF
- CSV and TSV in a spreadsheet grid
- SQLite, view and edit
- Archives
- Disk images: .dmg, .iso, sparse images
- Installer packages (.pkg)
- App bundles: signing, Mach-O, Info.plist
- Binaries: Mach-O, ELF, PE
- Property lists
- Certificate files (.p12, .pfx)
- Manual pages
- Torrent files
- Your own viewers, scripted in Lua, JavaScript or Python
Video plays through Apple’s decoders and a bundled FFmpeg without patent-pool codecs, so not every file plays: which ones do depends on the codec and your Mac.
Write your own viewer
For a format DriveManager doesn’t know — a sensor log, a game cartridge header, your company’s own files — write a small script viewer in Lua, JavaScript or Python. It reads the file and returns sections, tables, trees and text, drawn like the built-in viewers.
- Drag the script into Settings ▸ Script Viewers; Install Examples adds the ones that come with the app
- A new or changed script stays off until you approve it
- A script can only look at the one file it was opened on: it can’t change files, start programs or reach the network
- Time and memory limits stop a runaway script (2 seconds and 128 MB unless you change them)
Questions about the viewers
How is this different from Quick Look?
Each viewer is made for its format: an SQL editor for databases, an Outline for Markdown, a grid with sums for CSV, page links for manual pages. You can also turn the other panel into a preview that follows the cursor with ⌃Q, using the same viewers.
Can I preview files in the cloud or on a server?
Yes. F3 works the same on every source. The file is downloaded first, with a progress bar, and kept in the file cache so the next look is quick.
Can I edit an SQLite database?
Yes, in Edit mode. Changes stay pending until you save, then all of them are written in one transaction. DriveManager reminds you before the first save that the changes go straight into the file.
Which video files play?
Whatever macOS plays itself, plus MKV, WebM and more through a bundled FFmpeg. That FFmpeg has no patent-pool decoders, so whether a particular file plays depends on its codec and your Mac.
Is there a viewer for comparing two files?
Yes: ⌥F3 compares two files side by side, line by line for text or as two images. See DriveManager’s developer tools.
Coming soon to the Mac App Store.
€12.99 One-time purchase. No subscription. Every feature included.
Mac App Store prices vary by country. See prices · macOS 26 Tahoe or later, Mac with Apple silicon.