ShelfSpace

Your games are bigger than they need to be. ShelfSpace compresses installed games with the compression built into Windows (the same engine as compact.exe), so they take less space and keep working exactly as before. No repacking, no mods, nothing to extract before playing.

See the savings before anything is touched. Press Estimate: ShelfSpace samples every included game with the real algorithm and shows how much you can free, as a low–high range. Only then press Compress.

Games stay intact. Files are compressed in place by the file system; games read them normally. Tested on real Steam games with Steam's own "Verify integrity of game files" after every compress, decompress and cancel. You can decompress any game back to full size at any time.

Keeps working after updates. Game updates rewrite files uncompressed. The optional updates watcher runs from the tray and re-compresses changed files after a quiet period.

Features

• Finds your Steam libraries automatically; any other game folder or drive can be added by hand
• Pick which games to include with one click
• Algorithms: XPRESS4K / 8K / 16K and LZX, with parallel workers and a per-drive limit for HDDs
• Pause, resume and cancel at any time
• Cleanup of leftovers from uninstalled games and stale shader caches (to the Recycle Bin, only what you select)
• Disk report: what games take on each drive and how much can still be freed
• Four animated themes: Diorama, Cosmos, Liquid, Terminal
• 11 languages: English, Deutsch, Español, Français, Polski, Português (Brasil), Türkçe, Русский, 日本語, 简体中文, 한국어
• No administrator rights, no drivers, no account, no telemetry

How much will I save?

It depends on the game. In our tests with LZX, Dota Underlords freed 805 MB, Unturned 752 MB and Stumble Guys 599 MB (roughly a quarter to a third of their size), while Brawlhalla, which ships already-compressed data, freed only 22 MB. The estimate tells you which kind each of your games is before you spend any time on it.

Requirements

Windows 10 or 11, NTFS drive, Microsoft Edge WebView2 (included in Windows 11 and current Windows 10).