Convert any file by dragging it.

Hold Shift while you drag a file in Finder or File Explorer. Drop it into a box, and the converted copy lands beside the original.

Free for Mac and Windows. Mac: Apple silicon, macOS 14 or later. Windows: 64-bit Windows 10 (version 2004) or later, or Windows 11.

On Windows, if you see “Windows protected your PC”, click More info, then Run anyway. Isomer isn’t code-signed yet.

Opening Isomer for the first time

On a Mac

macOS will say Apple could not verify Isomer is free of malware. That’s because Isomer isn’t notarized by Apple yet, not because anything is wrong.

  1. Drag Isomer into your Applications folder.
  2. Double-click Isomer. When the warning appears, click Done.
  3. Open menu › System Settings › Privacy & Security.
  4. Scroll down to Security. You’ll see Isomer was blocked to protect your Mac. Click Open Anyway.
  5. Enter your Mac password or use Touch ID, then click Open Anyway again.

On Windows

Windows will say Windows protected your PC. That’s because Isomer isn’t code-signed yet, not because anything is wrong.

  1. Open Isomer-Setup.exe from your Downloads folder.
  2. When the warning appears, click More info, then Run anyway.
  3. Isomer installs itself and starts. Look for it in the system tray (the ^ arrow at the right of the taskbar).
  4. Hold Shift and drag a file from File Explorer to see the bar.

Convert

  • Photos, video, audio and documents
  • PDF to Word and back
  • Speech to text and captions
  • Notebooks, e-books and archives
  • Batches, or replace the original

Images and PDFs

  • Compress, crop, edit, annotate
  • Redact anything private
  • Add or remove a background
  • Collages and PDFs from images
  • Merge, split, sign and lock PDFs

Video, audio and more

  • Trim, crop, compress, change speed
  • Split, join, redact, snapshot
  • Even out loudness, bleep words
  • Turn audio into video
  • Edit metadata, rename in bulk
Drop a file into a box. The converted copy rises back out.

Convert a copy

Six formats picked for your file. Saved next to the original.

The Isomer bar offering JPG, PNG, PDF, WebP, AVIF and TIFF

Replace the original

The original moves to the Trash (the Recycle Bin on Windows) once the new file is ready. Hold Control (Ctrl) as well as Shift.

The Isomer bar marked Replaces original

Tools for that file

Hold Option (Alt on Windows) as well as Shift. Compress, crop, trim, redact and more, without opening an app.

The Isomer tools bar: compress, metadata, edit, annotate, add background, crop, redact

Nothing leaves your computer.

No uploads, no account. Error reports, if you allow them, never include your files.

Uses almost nothing.

Waits in your menu bar (or the system tray on Windows) without touching the processor.

Processor
0.0%
Memory
35 MB

Measured on a Mac.

Isomer app icon

Stop opening apps to change a file.

Isomer lives in your menu bar or system tray and waits for the next drag.

Download for Mac Download for Windows

Free for Mac and Windows. Mac: Apple silicon, macOS 14 or later. Windows: 64-bit Windows 10 (version 2004) or later, or Windows 11.

On Windows, if you see “Windows protected your PC”, click More info, then Run anyway. Isomer isn’t code-signed yet.

Isomer is free. If it saves you time, you can buy me a coffee.

Buy Me a Coffee

Questions, ideas or a file Isomer can't handle? Get in touch.

Email me