The best batch image resizer for Mac
By Himanshu Ranjan · Updated 8 November 2026
XnConvert is the best free batch image resizer for Mac for personal use, with over 80 actions and 500+ input formats. Retrobatch Pro builds reusable visual workflows for $49.99. FileDial has one-click social media sizes and smart crops. For occasional jobs, Preview and Finder's Convert Image Quick Action resize several images at once for free.
How we chose: FileDial is our product, so read this list with that in mind. We chose picks for batch image resizing from each vendor's own published information (product pages, pricing pages, support docs and privacy statements), checked on 2026-11-09, plus FileDial's own documented behavior. We did not lab-test every tool or run size or speed benchmarks on the others, so we quote no numbers for them. Order reflects fit for this search, not who made the app. Checked 2026-11-09.
1. XnConvert
XnConvert is a cross-platform batch image converter for Windows, Mac and Linux with over 80 actions, including resize, rotate and compress, reading more than 500 formats and exporting about 70. The Mac download is a Universal DMG for Intel and Apple silicon.
- Free for personal use
- Over 80 actions to chain
- Reads 500+ formats
- Paid licence for company use
- Busy interface
2. Retrobatch Pro
Retrobatch from Flying Meat is a node-based batch processor for resizing, converting and watermarking anything from one image to thousands. It comes in Pro and Regular editions with different node sets, runs natively on Apple silicon and Intel, and needs macOS 12 or later.
- Visual workflows you can save and rerun
- Handles thousands of images
- Mac-native
- Pro price is the highest here
- Learning curve for node workflows
3. FileDial
FileDial is our app. Resize has Resize to 1080 px, Resize to 2048 px, Resize to 50%, Resize… and crops, plus presets such as Instagram portrait 4:5 (1080×1350), Story 9:16 (1080×1920), YouTube thumbnail (1280×720) and Open Graph image (1200×630), which fill around the subject and remove metadata. Smart crop tools crop around the subject that Apple's Vision finds.
- Social and web presets
- Smart crops around the subject
- Recipes chain resize with convert or compress
- Fewer custom options than XnConvert or Retrobatch
- Not free after the 1-day trial
- Needs macOS 14 or later on an Apple silicon Mac (M1 or newer)
4. Preview (built into macOS)
Open the images in one Preview window, select them in the sidebar and choose Tools > Adjust Size, then enter a width and height, pick a Fit into size or use percent, with Scale proportionally on. Preview changes the open files, so work on copies.
- Already installed
- Exact pixel or percent sizes
- Keeps proportions
- Edits the files you opened
- Slow for very large batches
5. Finder Quick Action: Convert Image
Select images in Finder, Control-click, choose Quick Actions and then Convert Image (under More if needed), and pick a format and a size. It is quick for a batch that just needs to be smaller.
- No app to open
- Converts and resizes in one step
- Free
- Only a few preset sizes
- No cropping
How we ranked these batch resizers
Batch resizing usually means getting a folder of photos to one width for a website, a product catalogue or social media. We ranked on flexibility, ease of repeating the job, price and whether it all runs on the Mac.
XnConvert leads because it is free for personal use, runs on Mac, Windows and Linux and chains resizing with dozens of other actions. Retrobatch Pro is the best Mac-native choice for repeatable workflows if you will reuse them. FileDial is third, and the fastest when you want a common size like an Instagram portrait or Open Graph image without setting anything up. Preview and the Finder Quick Action cover occasional jobs for free.
Resize, crop or fill
Resizing changes pixel dimensions and keeps the shape. Cropping cuts the image to a new shape, such as square or 4:5. Platforms with fixed shapes need both, and a plain center crop can cut off heads or products.
FileDial's Smart crop 1:1, 4:5, 9:16 and 16:9 crop around the subject Apple's Vision finds, and its social presets fill around the subject to the exact size. Retrobatch and XnConvert let you define crop and resize steps yourself.
Free method with Preview
Duplicate the images first, because Preview changes the files you open. Open the copies together in one Preview window, select all in the sidebar, choose Tools > Adjust Size, set the width or a percentage with Scale proportionally on, and click OK. Then choose File > Save, or close the window and save when prompted.
Automating repeat jobs
If you resize images every week, automation saves the most time. Retrobatch saves workflows you can rerun on a new folder. XnConvert saves presets of actions. FileDial's recipes chain tools, for example a resize, then Convert to WebP, then Remove location, and watched folders run a recipe on anything dropped into a folder.
Questions
How do I batch resize images on a Mac for free?
Open the images in one Preview window, select them in the sidebar, choose Tools > Adjust Size and enter a width or percentage. Preview edits the files you opened, so use copies. Finder's Convert Image Quick Action also resizes a selection while converting it, and XnConvert is free for personal use.
Can I resize images without losing quality?
Making images smaller is generally safe and looks sharp, though detail is removed as pixels are dropped. Making them larger adds no real detail with a standard resize. FileDial's Resize › Upscale 2× and Upscale 4× use Apple's on-device super resolution, tile by tile.
What size should images be for Instagram?
Common sizes are 1080×1350 for a 4:5 portrait post, 1080×1080 for a square post and 1080×1920 for a 9:16 story. FileDial has presets for each, such as Resize › Instagram portrait 4:5 (1080×1350), and the other tools here let you enter these sizes manually.