You don’t have to be a tech genius to use your computer.

Taking back control of your computer is as easy as 1, 2, 3!

  • Shrink, combine, and split PDFs—all on your computer
  • Convert, trim, and edit audio and video files
  • Download media from links with a clear review before anything runs
  • Find duplicate files and free up disk space

…and much more.

Explore all the features

Download for Mac

Other downloads: for Windows and Linux.

Download for Windows

Other downloads: for Mac and Linux.

Download for Linux

Other downloads: for Mac and Windows.

Download for Mac Download for Windows Download for Linux

Every feature, free to evaluate—no time limit. Your files stay on your computer. See pricing

Everything you need for everyday file work

Every tool follows the same calm sequence: pick inputs, choose the outcome, review before running.

Documents

  • Make PDFs smaller
  • Combine PDFs and images into one PDF
  • Split pages into separate files
  • Add or remove password protection

Audio and video

  • Convert audio and video files
  • Trim and normalize audio in batches
  • Combine clips and edit videos in batches
  • Make videos smaller or more compatible
  • Turn audio into video with images or artwork

Media links

Save media from links, choose where it should go, and review the job before any files are written.

Disk cleanup

  • Find duplicate files across folders
  • Clear temporary files and caches
  • Spot the large files and folders filling your disk

You see exactly what will be deleted before anything is removed.

How it works

Every tool uses the same three-step pattern, so you see the result before it runs. Conversions and edits write a new file next to the original and leave the original in place.

1. Pick inputs—add files, folders, or links.
2. Choose the outcome you want.
3. Review the summary, then run.

Why it exists

Shrinking a PDF, making a video small enough to share, or converting a recording used to mean one of two bad options. Upload the file to a website and hope nobody kept a copy, or look up the right command-line flags every time. Neither belongs near a contract, a client report, or family videos.

Diametheus is those tools behind the same three steps: pick the files, choose the result, check the summary, then run. Point it at a folder and it takes every file the tool can use, subfolders included, and leaves the rest alone.

Read the full story

Originals stay put

Conversions and edits write a new file next to the original, with a suffix in the name. Report.pdf stays Report.pdf. The smaller copy is Report-compressed.pdf. The summary shows that destination before anything runs.

Tools that remove files, such as duplicate cleanup, list exactly what will go and wait for you to confirm.

On your computer

Nothing is uploaded. The work happens on your machine. Diametheus goes online only to fetch its helper tools on first launch, to check for updates, to activate a license, or to download a link you gave it.

If a file chore is still done by hand, or still uploaded somewhere to finish, say so. Suggestions decide what gets built next.

Local by default

Diametheus is a desktop app. Your files stay on your computer while trusted helper tools do the heavy work behind a clean interface.

Built for repeated chores

Useful for creators, consultants, office teams, and technical users who want reliable batch workflows without keeping command snippets around.

Download Diametheus

Every feature works from the first run, with no time limit. A license removes the occasional purchase reminder. See pricing.

Read release notes for what changed in recent builds.

Download for Mac

Size: 6 MB

Mac with Apple silicon (M1 or later), macOS 12 or later

Other downloads: for Windows (6 MB) and Linux (7 MB).

Download for Linux

Size: 7 MB

Ubuntu 22.04 or newer, Debian 12, and other 64-bit distributions; .rpm, AppImage, Arch and ARM below

Other downloads: for Mac (6 MB) and Windows (6 MB).

Download for Windows

Size: 6 MB

Windows 10 or 11, Intel or AMD (64-bit); Windows on ARM below

Other downloads: for Mac (6 MB) and Linux (7 MB).

Download for Mac

Size: 6 MB

Mac with Apple silicon (M1 or later), macOS 12 or later

Download for Linux

Size: 7 MB

Ubuntu 22.04 or newer, Debian 12, and other 64-bit distributions; .rpm, AppImage, Arch and ARM below

Download for Windows

Size: 6 MB

Windows 10 or 11, Intel or AMD (64-bit); Windows on ARM below

All downloads: Windows on ARM, Linux on ARM, .rpm, AppImage and Arch Linux

Mac

Mac with Apple siliconpkg · 6 MB

Windows

Windows (Intel or AMD)x64 · msi · 6 MB
Windows on ARM (Snapdragon)ARM64 · msi · 6 MB

Linux

Ubuntu, Debian, Mint (.deb)
sudo apt install ./diametheus-linux.deb		x64 · deb · 7 MB
Fedora, openSUSE (.rpm)
sudo dnf install ./diametheus-linux.rpm		x64 · rpm · 7 MB
Arch Linux, Manjaro (pacman)
sudo pacman -U diametheus-linux.pkg.tar.zst		x64 · pacman · 7 MB
Any distribution (AppImage)
chmod +x diametheus-linux.AppImage && ./diametheus-linux.AppImage		x64 · AppImage · 81 MB
Ubuntu, Debian, Raspberry Pi OS (.deb)
sudo apt install ./diametheus-linux-arm64.deb		ARM64 · deb · 7 MB
Fedora, openSUSE (.rpm)
sudo dnf install ./diametheus-linux-arm64.rpm		ARM64 · rpm · 7 MB
Any distribution (AppImage)
chmod +x diametheus-linux-arm64.AppImage && ./diametheus-linux-arm64.AppImage		ARM64 · AppImage · 80 MB

Checksums: SHA256SUMS

The .deb, .rpm and Arch packages install qpdf and Ghostscript for the PDF tools. With the AppImage, install both from your distribution first.

App version 1.2.0 · Built October 26, 2026 at 13:27

Pricing

Free, Essential, and Pro are the same app

Every tool works from the first run, with no time limit. After 20 completed jobs, Free shows a short reminder every so often. Dismiss it and keep working. Essential removes that reminder and includes updates for one year after purchase. Pro removes the reminder and includes updates for as long as active development continues.

Free

The full app, for as long as you want

No purchase $0
  • After 20 completed jobs, a short reminder appears every so often. Dismiss it and keep working.
  • Every tool, with no time limit and nothing locked
  • Same tools as Essential and Pro. A license removes the reminder.
Download

Nothing stops working if you never buy a license.

Essential

Same app. Reminder removed. One year of updates.

Early supporter price

Early supporter $40 USD
Regular $50

Regular price shown for context

  • Updates for one year after purchase. You keep the last version you received.
  • Removes the purchase reminder
  • One named person, on their computers. Pay once.

After purchase, your license key is emailed to you and shown in the members area.

Pro

Same app. Reminder removed. Updates while development continues.

Early supporter price

Early supporter $160 USD
Regular $200

Regular price shown for context

  • Updates for as long as active development continues
  • Removes the purchase reminder
  • Priority help and early-access builds, when those are offered
  • One named person, on their computers. Pay once.

After purchase, your license key is emailed to you and shown in the members area.

Team is Essential for up to ten people. Team Pro is Pro for up to ten people. Seats can be reassigned inside your organization.

Team

Essential for up to ten people. Updates for one year.

Early supporter price

Early supporter $800 USD
Regular $1,000

Regular price shown for context · up to 10 seats

  • Updates for one year after purchase. You keep the last version you received.
  • Removes the purchase reminder for each seat
  • Up to ten employees. Each seat covers that person's computers. Pay once.

After purchase, your license key is emailed to you and shown in the members area.

Team Pro

Pro for up to ten people. Updates while development continues.

Early supporter price

Early supporter $4,000 USD
Regular $5,000

Regular price shown for context · up to 10 seats

  • Updates for as long as active development continues
  • Removes the purchase reminder for each seat
  • Priority help and early-access builds, when those are offered
  • Up to ten employees, reassigned inside your organization. Pay once.

After purchase, your license key is emailed to you and shown in the members area.

Prices are one-time. Free has no time limit. A license removes the reminder and sets how long updates are included. The tools stay the same.

Need something custom? Contact us and describe your team.

Read our privacy notes for how we handle your data.

Regular list prices are $50 (Essential), $200 (Pro), $1,000 (Team), and $5,000 (Team Pro) USD, all applicable taxes included. The larger price with strikethrough is the planned regular price; the bold price is the planned early supporter price.

Frequently asked questions

Need help? Contact us or check the support notes.

No. Diametheus runs on your computer and processes the files and folders you choose locally.

Macs with Apple silicon (M1 or later) on macOS 12 or later; Windows 10 or 11 on Intel, AMD, or ARM; and 64-bit Linux on Intel, AMD, or ARM, such as Ubuntu 22.04 or newer, Debian 12, Fedora, openSUSE, and Arch. Intel Macs are not supported.

Some workflows rely on trusted open-source helpers such as FFmpeg and yt-dlp. Diametheus downloads the ones your computer needs on first launch, from our own download site, so the installer stays small and the helpers can be updated on their own.

No. Diametheus is focused on guided, reviewable file workflows.

Yes. Download Diametheus and use every feature with no time limit and no locked tools. After 20 completed jobs, the app shows a short reminder every so often. If Diametheus is useful to you, please buy a license.

Nothing stops working. Every so often, a dismissible reminder appears after a job finishes. Activating a license removes it for good, and you can buy one at any time.

You keep using the app after purchase. Essential and Team include updates for one year after purchase. Pro and Team Pro include ongoing updates while development continues. You can always keep the last version you received.

Yes. Essential and Pro are for a named person and stay with that person. For seats you can pass between employees, choose Team or Team Pro.

Yes. Individual licenses cover one person across all their computers, whether Mac, Windows, or Linux. Team licenses apply per employee the same way.

They include the same app. Nothing is locked, and there is no time limit. Free shows a short reminder every so often after 20 completed jobs; dismiss it and keep going. Essential and Pro remove that reminder. Essential includes updates for one year after purchase. Pro includes updates while Diametheus is actively developed, plus priority help and early-access builds when those are offered. Team matches Essential for up to ten people. Team Pro matches Pro for up to ten people. You keep the last version you received.

Checkout is handled securely by Stripe. After purchase, your Diametheus license key is emailed to you and available in the members area.