More room.
Same files.

No. DiskPress is not a duplicate file remover. Both files stay available at their existing paths. After verifying identical contents, DiskPress replaces a duplicate with an APFS (Apple File System) copy-on-write clone. Each file keeps its own name and metadata.

The files share the same physical data blocks, including compressed data, instead of storing those blocks twice. Metadata still takes some space, so a clone avoids another full copy of the data, not every storage cost. Sharing requires compatible files on the same APFS volume and does not work across separate drives. Matches can span different saved locations.

You can edit or delete either file without changing the other. APFS stores changed data separately while continuing to share unchanged blocks, so later edits can use more space. DiskPress does not use hard links. See how APFS clones differ from hard links, with a 10 MB example.

Yes. DiskPress is needed to optimize files, not to read them. Native compression and APFS clone sharing are handled by macOS, without a proprietary DiskPress format or reader. Successfully optimized files remain accessible after you quit or uninstall DiskPress.

Another Mac with compatible macOS and filesystem support can read them without DiskPress. The app only needs to run for new optimization or monitoring. Editing, replacing, copying, or restoring files can change or remove local savings depending on the operation.

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.

File compression can make compressible user data use up to 50% less space, but this is a possible result, not a promise for your files or your whole disk. File deduplication can add further savings when identical files do not already share storage. Our combined savings example shows how 30% compression plus deduplication can reduce the data storage for two identical files by 65%.

The outcome depends on the contents, existing compression, duplicate copies, filesystem, and settings. Already-compressed media and archives may save little or nothing. The screenshots illustrate the app with example data, 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 does not upload your files, filenames, or optimization results. File optimization works offline in both the Mac App Store and Setapp versions. Settings, authorizations, Activity, recovery records, and savings measurements stay on your Mac.

The Mac App Store version has no in-app usage analytics SDK and needs no separate DiskPress account. The Setapp version includes Setapp activation and app-usage reporting, including menu bar interactions. Setapp license checks may require internet access, and usage reports can be sent when you reconnect. Local file processing does not mean the Setapp version is telemetry-free.

If an application integrity check fails, DiskPress for Mac automatically opens a diagnostic webpage with a numeric check identifier. The website uses cookie-free Plausible analytics and can count these visits by failure code. This is separate from Setapp usage reporting.

Read the privacy policy for details about local records, diagnostic visits, website analytics, and support. The separate iPhone and iPad app has no analytics or telemetry. See DiskPress for Files privacy.