A little clarity. A lot more control.

DiskPress is a native Mac utility that reduces the physical storage used by supported files. It combines transparent, lossless filesystem compression with APFS clone-based deduplication. Your files keep their contents and paths and remain readable by normal apps.

Choose files for a one-time optimization, save folders for regular use, or enable background monitoring. The built-in CLI gives scripts and AI agents the same optimization engine.

Cleanup usually frees storage by removing files, such as unused apps or caches. That is useful when you no longer need the contents, but caches may be recreated and you may want to keep your files.

DiskPress changes how supported files are stored instead. It does not empty your caches, uninstall apps, or ask you to delete duplicate copies. It is a different tool for a different need, not a replacement for every kind of cleanup.

DiskPress uses the compression format macOS already understands, with LZFSE-compressed data and native filesystem metadata. macOS transparently returns the original bytes when an app reads a compressed file. There is no ZIP to open, special reader to install, or cloud service involved.

Before committing a compressed replacement, DiskPress checks its contents and metadata. It only keeps results that meet the configured minimum savings.

No. DiskPress verifies identical file contents and uses APFS clones to let separate files share physical storage. Each file keeps its own path and metadata. This is not a hard link or a shortcut.

APFS uses copy-on-write, so changing one file does not change the other. New or replaced data may use more space. Sharing requires compatible files on the same volume and does not work across separate drives.

Yes. Compression and clone sharing live in the filesystem, not in the DiskPress process. Files remain readable and keep their optimized storage after you quit or remove the app.

DiskPress only needs to run to do new work or keep monitoring. Editing, replacing, or copying files can change or remove earlier savings, depending on how the writing or copying app handles them.

Compressible user data can use up to 50% less space, but this is a possible result, not a promise for your files or your whole disk. The outcome depends on the contents, existing compression, duplicate copies, filesystem, and settings. Already-compressed media and archives may save little or nothing.

The app screenshots show one real example. They are not a benchmark or a guaranteed result. Deduplication savings are estimates of shared storage, and a saved-space total is not a guarantee of an identical increase in macOS available space.

DiskPress requires macOS 10.15 Catalina or later. APFS is the recommended filesystem for the full compression and deduplication workflow. Compression requires a local, writable volume with native compression support. Deduplication also requires clone support on that same volume.

Compatible external APFS drives can be used with permission. Network shares and read-only volumes are not optimization targets. On Catalina, current deduplication savings cannot be measured and are shown as unavailable rather than zero. Automatic login registration requires macOS 13 or later.

Get DiskPress from the Mac App Store. The listing shows the current price, availability, and requirements for your region. Apple handles the download, purchase, and App Store updates.

Start with a specific folder of ordinary, locally stored files that are not changing constantly. Plain text, logs, source files without executable permissions, and other uncompressed data can be good compression candidates. Identical copies on the same volume may benefit from deduplication.

Select only the folders you actually want optimized. Keep an independent backup of important data and review the first results in Activity before enabling ongoing monitoring.

No. DiskPress excludes application bundles, their contents, and files with executable permissions. It is built for ordinary user files, not installed software.

Optimizing applications needs a more specialized architecture. App Archiver, also made by Ighor July, is the dedicated app for compressing, optimizing, and archiving supported Mac apps. Use DiskPress for your files and App Archiver for your apps.

A skip is often intentional. DiskPress checks permissions, volume support, file type, configured exclusions, minimum savings, and other safety conditions. It avoids symbolic links, hard-linked files, empty files, protected locations, cloud-only placeholders, and unsupported metadata combinations.

Default exclusion groups cover common archives, disk images, installers, images, audio, and video. You can adjust extension, wildcard, and regular-expression rules in Settings. File-size limits apply to compression, not every deduplication or measurement operation. Activity explains individual outcomes.

No. DiskPress protects broad roots and sensitive locations, including system folders, application folders, important parts of your Library, backups, and managed packages such as photo libraries and virtual machines. Choose specific ordinary data folders instead.

Overriding an exclusion is not permission to bypass these protections. DiskPress does not ask for administrator access to force unsupported targets through.

DiskPress does not download cloud-only files to optimize them. Local availability is only one requirement, and some cloud-managed files are skipped for safety. A sync provider may replace a local file later, removing its optimization, and may use its own storage or synchronization rules.

Prefer stable local folders when you want predictable results. DiskPress does not compress your cloud storage allocation or control a cloud provider.

DiskPress prepares replacements separately on the same volume, verifies logical contents and metadata, and uses an atomic replacement operation. Deduplication checks equality before making a clone. Recovery records help handle interrupted operations without guessing which copy should be kept.

These safeguards do not make storage operations risk-free. Keep a separate backup. DiskPress is not backup software and has no general Undo or restore-original-storage button. After a successful verified replacement, the temporary original is removed.

Yes. Use Cancel in the progress window, or Ctrl+C from the CLI, and allow the operation to finish stopping. Completed optimizations stay in place. Cancellation does not roll back earlier files.

If DiskPress reports that recovery needs attention, preserve the files it identifies and follow the message. Do not delete recovery material just to clear the warning.

Optimization uses CPU and disk activity, and reading a compressed file requires macOS to decompress its data. The effect depends on your files and workload. DiskPress does not promise a speed increase or zero overhead.

Choose Low CPU, Balanced, Fast, or Fastest in Settings. Low CPU adds pauses, while faster modes allow more work in parallel. Separate battery and power-adapter settings and an optional pause on battery let you control background work.

Drop files or folders into the main window, or pin DiskPress to the Dock and drop them onto its app icon. This starts the one-time workflow without making the selection a permanently monitored location.

You can follow progress, cancel, or choose Continue in Background. That button continues the current job without the progress window. It does not enable recurring monitoring. Use Show Progress to return to the job.

No. Adding a location saves your choice and measures its current storage. Choose Optimize Now to process enabled saved locations, or enable Monitor automatically for ongoing work.

Saved locations remain available when monitoring is off. Disabling or removing a saved location does not decompress its files or undo existing clone sharing.

Enable Monitor automatically after choosing your folders. DiskPress scans enabled locations on a schedule and uses filesystem change notifications as hints. It does not repeatedly compress a file on every write.

The default interval is 10 minutes after the previous scan and its work finish. You can set an interval from 1 minute to 24 hours. Recent-file protection normally waits at least 1 minute before processing newly observed or recently changed files in saved locations. Adjust both settings to fit your workload.

While monitoring is enabled, the menu bar shows DiskPress status, available space on the home volume, current measured savings, optimized file counts, and savings over the last 24 hours, 7 days, and 30 days.

You can open the main window, add a location, optimize now, stop monitoring, open Settings, or quit. Status can show scanning, optimization, a battery pause, an issue, or the next scheduled scan. The menu bar icon disappears when monitoring is stopped.

With monitoring enabled, choose Continue in Menu Bar when closing the window to keep DiskPress working. Choosing Quit DiskPress stops monitoring and disables its automatic login registration. Existing file savings remain.

On macOS 13 or later, enabling monitoring registers DiskPress to start at login, subject to any approval macOS requires in System Settings. A normal logout or restart preserves the monitoring preference. On older versions, start the app yourself when you want it to monitor.

Current savings are a measured snapshot across all saved locations, including disabled ones. They can include files that were already compressed or sharing storage before DiskPress processed them. Overlapping locations and shared file identities are counted only once. Use Rescan to refresh the measurement.

Recent savings record completed optimization work over time. Editing or removing a file can lower the current total without rewriting that history. Activity is a per-file log, not a second savings total, and a file can have both compression and deduplication records.

Compression savings, estimated shared storage, immediately free space, and macOS available space measure different things. The disk bar describes the home volume, while your saved locations can span several volumes.

Reclaimable means space macOS reports it may be able to release, not space DiskPress promises to save. Snapshots, ongoing writes, and storage accounting can affect when available space changes. Deduplication estimates are conservative and may not measure every shared block.

No. The DiskPress app works offline. It has no account, analytics, telemetry, or file uploads. Settings, authorizations, activity, recovery records, and savings measurements stay on your Mac.

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Yes. The app bundle includes a CLI for checking permissions, inspecting files, optimizing targets, and reading settings, activity, and savings. It runs without a window by default and supports newline-delimited JSON for automation.

First grant the relevant folders read/write access in Settings under Authorized Paths. The CLI cannot grant permissions, bypass safety rules, or change settings. A CLI-only launch runs the DiskPress process for the command, starts no recurring monitoring, and exits when its commands finish. See the CLI guide.

DiskPress itself does not send anything to an AI service. It returns information locally to the program that invoked it. CLI reports can include filenames, paths, and activity details.

Your chosen agent may transmit the command output or other information under its own settings and privacy policy. Review that agent before sharing private paths or file contents, and authorize only the work you intend it to do.