Convert BMP to ICNS on Mac.

Local file processing, by renaming the file in Finder. No converter window and no upload queue.

Finder rename

report.bmpreport.icns

How the rename works

  1. 1

    Start with report.bmp

    Put the BMP file in a folder RenameTo watches, such as Desktop or Downloads.

  2. 2

    Rename it to report.icns

    In Finder, change .bmp to .icns, then press Return. The rename is the command.

  3. 3

    Find the ICNS beside it

    RenameTo produces the requested output and keeps a restorable backup of the original.

What happens under the hood

RenameTo reads the BMP with the appropriate local macOS media or document framework, then writes a new ICNS beside it. The file itself is not sent to a conversion server.

About the formats

BMP is a legacy Windows bitmap format. ICNS is the macOS app-icon container.

Questions, answered

Does my file get uploaded anywhere?

No. File processing happens on your Mac. RenameTo does use the network for license validation, trial activation, and update checks, but your source files are not part of those requests.

What happens to the original BMP file?

RenameTo keeps a backup before processing. Undo restores the original alongside a format-changing output and does not delete that output. If the original name is already occupied, the restored copy gets “(restored)” in its name.

Can I convert a whole folder?

Yes. Rename multiple selected files in Finder and RenameTo queues each supported conversion, with a separate result and backup for every file.

Can I run the same conversion from a script?

Yes. The CLI command is: renameto icns *.bmp

Related conversions

Convert BMP to AVIF

report.bmp → report.avif

Convert BMP to GIF

report.bmp → report.gif

Convert BMP to HEIC

report.bmp → report.heic

Convert BMP to ICO

report.bmp → report.ico

Convert Sony ARW to ICNS

report.arw → report.icns

Convert AVIF to ICNS

report.avif → report.icns

Convert Canon CR2 to ICNS

report.cr2 → report.icns

Convert Canon CR3 to ICNS

report.cr3 → report.icns

Looking for another format? Browse every conversion.