Tessera

Tessera shows you where your disk space went. Point it at a drive or folder and it maps every file to a rectangle sized by the space it occupies. The 40 GB thing you forgot about stops being buried twelve folders deep and becomes the biggest block on screen. Select it, check the path and size, and send it to the Recycle Bin without leaving the app. Your C: drive is full and Explorer won't tell you why Windows tells you how much space is left. It won't tell you what took it. Finding the culprit by hand means opening folder after folder, checking properties, guessing. Tessera does it in one pass. A map, not a spreadsheet Tessera draws your disk as a treemap: every file is a rectangle, and the rectangle's area is proportional to its size. Big files are big shapes. You don't have to read anything to find them — they're simply the largest things on screen, colour-coded by file type. A conventional size-sorted folder tree sits alongside it, and the two stay in sync both ways. Click a block in the map, the tree jumps to it. Select a folder in the tree, the map highlights it. Double-click to drill in; one button to come back out. Fast enough to actually use Tessera scans with one worker per CPU core over a shared queue, pulling sizes straight from the OS directory entries rather than opening every file. Counters tick up live while it works, and you can cancel at any point and keep the partial result. Delete with confidence, not hope Deleting from a disk cleaner should never be the scary part. Tessera confirms every deletion with the full path and size in front of you, and sends files to the Recycle Bin, not oblivion. Network shares have no Recycle Bin, so there the menu says Delete permanently and the dialog spells out that it cannot be undone — rather than promising a safety net Windows will not provide. Rescan a single folder after a clear-out and the totals re-propagate to the root without re-reading the whole drive. Honest about what it shows you A disk map that quietly leaves things out is worse than no map at all, because you will act on it. Junctions and symlinks are displayed but never followed, so nothing is counted twice and no loop can hang a scan. Folders Windows won't let it read are flagged and counted rather than quietly appearing empty. Every detail level draws the whole disk. Turning the detail down makes the blocks chunkier; it never leaves gaps in the picture. A drive or share that can't be reached says so, instead of showing you an empty disk and letting you believe it. Network drives too Point it at a UNC path — typed into the toolbar, passed on the command line, or mapped to a drive letter — and it maps a NAS or file server the same way it maps a local disk. The scanner raises its concurrency for network latency, because over SMB the time goes on round trips rather than CPU. No install, no account, no telemetry One self-contained executable. Nothing is installed, no runtime is required, no data leaves your machine, and nothing is written outside the app's own folder. Copy it to a USB stick and run it on any Windows 10 or 11 PC. For scripts and servers Tessera.exe --scan prints totals and exits without opening a window, with proper exit codes for automation. Everything it does Squarified treemap — file size becomes rectangle area, coloured by type Two-way sync — treemap and folder tree always agree Parallel scanner — one worker per core over a shared queue Recycle Bin delete — confirmed with full path and size, and told plainly when a share makes it permanent Network shares — scan a UNC path or a mapped drive, tuned for SMB latency Single-folder rescan — no full re-scan after a clear-out Top 100 largest files — the quick wins, in one list Adjustable detail — chunkier blocks for responsiveness on huge drives, never a partial picture Headless CLI — --scan for scripting, with real exit codes Portable — one file, no installer, no runtime, no telemetry What you need Windows 10 or 11, 64-bit No .NET runtime, no Visual C++ redistributable, no administrator rights No telemetry, no account, no licence server, nothing expires The executable is not code-signed, so Windows SmartScreen will warn on first run: click More info, then Run anyway. Proprietary licence, one-time purchase. The version you buy is yours.