Convert TIFF to PNG on Mac Free — Three Methods That Work

Mac has three free built-in or zero-install options for TIFF to PNG conversion. The browser tool is fastest for most jobs, Preview handles quick single-file exports without leaving your Mac's native tools, and Automator sets up a recurring pipeline if you convert regularly. Here's how each works.

Method 1: Browser tool — works on any Mac

1. Open this page in Safari or Chrome on your Mac.
2. Drag your .tiff files from Finder into the browser drop zone.
3. Click Convert.
4. Download the PNGs, or click "Download All" for a zip.

This is the fastest method for one-time batches because there's nothing to configure. Drag files in, click convert, download. Works on macOS Ventura, Sonoma, Sequoia, and any version supporting current Safari or Chrome.

For batches of 20+ files or files over 50MB, make sure you have sufficient free memory — close other apps before starting a large conversion. On Apple Silicon Macs (M1 and later), even large TIFFs convert quickly due to the unified memory architecture.

Method 2: Preview — zero setup, already on your Mac

Preview is macOS's default image viewer and can export TIFF to PNG losslessly:

Single file export:

1. Open the TIFF in Preview (double-click, or right-click > Open With > Preview).
2. File > Export.
3. Set Format to PNG.
4. Choose save location. Click Save.

Batch export with Preview:

1. Select multiple TIFF files in Finder.
2. Right-click > Open With > Preview (all files open in one Preview window).
3. In the sidebar, select all thumbnails (Cmd+A).
4. File > Export Selected Images.
5. Choose destination folder. Set Format to PNG. Click Choose.

Preview's PNG export is lossless by default — no quality setting to worry about, which actually simplifies the process compared to JPG export.

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Method 3: Automator — for recurring workflows

If you regularly receive TIFF files and need them as PNG, Automator's Folder Action watches a folder and auto-converts new files:

1. Open Automator (Spotlight search: "Automator").
2. Choose "Folder Action".
3. Set the folder to watch (e.g., a "TIFF Inbox" on your Desktop).
4. In the Actions library, find "Change Type of Images" — drag it into the workflow. Set it to PNG.
5. Optionally add "Move Finder Items" to send converted PNGs to an output folder.
6. File > Save. Give the action a name.

Now any TIFF you drop into the watched folder automatically converts to PNG. This is ideal for photographers who regularly export TIFFs from their editing software for web use — set it up once, runs indefinitely.

For batch conversion across different platforms, the TIFF to PNG on Windows guide covers equivalent options.

Which method to use on Mac

• One-time batch, any size: Browser tool. Fastest, most flexible, handles CMYK.
• Single file, quick: Preview. It's already open, the export takes 15 seconds.
• Files arrive regularly: Automator. Set up once, runs automatically forever.
• Need to edit before converting: GIMP (free) or Affinity Photo (paid, one-time).

For the vast majority of "I need to share this TIFF and the person can't open it" situations, drag it into the browser tool and you're done in 10 seconds. Preview is fine for single files when you're already working in Finder. Automator pays off when the task repeats daily.

Frequently Asked Questions

Does Preview produce lossless PNG output on Mac?

Yes. When you export a TIFF as PNG in Preview, the conversion is lossless. PNG is always lossless — there's no quality slider because no quality is being traded away. The resulting PNG is a pixel-perfect copy of the original TIFF.

Will the browser tool work on an older Intel Mac?

Yes, though conversion of very large TIFFs (150MB+) will take longer than on Apple Silicon. An Intel MacBook from 2019–2020 handles standard 20–50MB TIFFs comfortably in 5–15 seconds per file. Larger files may take 30–90 seconds.