Your files stay local.
Zero uploads. 300+ formats.
ZumiFiles is a local-first file browser, visual diffing workbench (image overlay sliders, text line diffs, folder diffs), Photoshop PSD layer inspector, Microsoft Visio diagram viewer, and 300+ format viewer that runs 100% inside your browser. No upload waiting, no server privacy concerns, no spam ads.
No Upload Delays. Zero Cloud Surveillance. No Ads.
Traditional online file converters force you to upload private files to mystery cloud servers, wait for upload progress, and dodge spammy ads or paywall pop-ups. ZumiFiles does everything directly on your machine.
Zero Upload Waiting
Browse gigabyte-scale project folders instantly on your local storage device. No network upload progress bars, bandwidth limits, or cloud timeouts.
100% Data Confidentiality
Your files, confidential documents, proprietary code, and private media never leave your computer. Everything runs strictly inside the local browser sandbox.
No Ads, Pop-Ups, or Paywalls
Say goodbye to shady converter sites with ad pop-ups, malware traps, and 100MB file size caps. ZumiFiles is completely clean, ad-free, and unrestricted.
Image Overlay Sliders, Text Line Diffs & Directory Tree Diffing.
Compare versions, detect changes, and audit differences across your assets without launching external desktop diff tools.
Image Diffing & Overlay Swipe Slider
Compare two image files side-by-side with synchronized pan & zoom, or switch to an interactive overlay swipe slider to blend and isolate pixel deltas between artwork revisions.
Text & Code Line-by-Line Diffing
Inspect exact additions, deletions, and line modifications between text, code, or markdown files with unified & split views, syntax highlighting, and whitespace toggle options.
Recursive Folder & Directory Tree Diffing
Compare two directory handles side-by-side to highlight missing files, added assets, modified sizes, and date timestamps across complex project trees.
Custom Viewers with Advanced Data Processing.
ZumiFiles goes far beyond basic previews. View Photoshop PSD separate layers, navigate Microsoft Visio multi-page schematics, process text files with sed & awk stream filters, and inspect audio waveforms.
Set Thumbnails Your Way — Any Image, Text, or Cover.
Default operating system file managers give you generic icons. ZumiFiles lets you customize thumbnails for any file or folder — and the thumbnail can even display something completely different from the file itself!
Custom Sidecar Artwork
Set a custom image thumbnail using .{filename}.png or .{filename}.jpg. The thumbnail image can be artwork or keyframes completely different from the file content!
Custom Text Typography
Create text-based thumbnails using .{filename}.thumbnail.txt to display custom titles, notes, or key specs right inside the grid cell.
Folder Cover Artwork
Set custom cover graphics for entire directories using .folder.png or .folder.jpg so project folders are instantly recognizable.
300+ Supported File Formats. One Browser App.
From Photoshop PSD layers and Microsoft Visio schematics to 3D CAD, diagrams, code, office documents, maps, and audio waveforms.
🎨 Photoshop & Graphics
Photoshop PSD/PSB with separate layer inspection, HEIC, Camera RAWs (CR2, NEF, ARW, DNG), Affinity, SVGZ, HDR
📐 Visio & Diagrams
Microsoft Visio (.vsd, .vsdx), Draw.io (.drawio, .mxfile), Excalidraw, Mermaid, Graphviz (.dot), MathML, PlantUML
📄 Office & Documents
PDF, DOCX, XLSX, PPTX, ODT, ODS, ODP, EPUB, RTF, MHTML, HAR, EML, MSG, VCF, ICS
🗺️ Geo & Maps
GeoJSON, GPX, KML, TopoJSON, Map (.map) files with Leaflet map tile controls
🎵 Audio & Waveforms
MP3, WAV, FLAC, OGG, M4A, AAC, OPUS, AIFF, AU/SND, MIDI (.mid, .mscx), 260-bar visualizer
📦 Archives & Collections
ZIP, TAR, GZ, BZ2, 7Z, RAR, XZ, ZSTD, CAB, JAR, WAR, MDB, Multi-Collection ZIP export