# How to Batch Process and Bulk Edit Screenshots on Mac

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Source: https://www.lazyscreenshots.com/blog/batch-process-screenshots-mac/
Source observed: 2026-09-15T19:57:44.861Z
Last checked: 2026-09-19T17:04:13.934+00:00
Indexed: 2026-09-15T20:04:28.838+00:00

---

# How to Batch Process and Bulk Edit Screenshots on Mac

April 29, 2026 · LazyScreenshots Team

We cover bulk renaming, resizing, format conversion, compression, watermarking, metadata removal, Automator, Shortcuts, and multi-device App Store screenshot generation using Mac tools.

## Batch rename in Finder

1. Open the screenshot folder.
2. Select files with `Cmd+A` or `Cmd`-click individual files.
3. Right-click and choose **Rename** or **Rename [X] Items**.

Finder provides:

- **Replace Text:** change “Screenshot” to “product-demo” across selected names.
- **Add Text:** prepend or append text such as `v2-` or `-final`.
- **Format:** apply sequential names such as `onboarding-step 1.png`; choose the starting number and number placement.

### Terminal rename

```bash
# Rename all screenshots to a sequential pattern
cd ~/Documents/Screenshots
counter=1
for f in *.png; do
  mv "$f" "screenshot-$(printf '%02d' $counter).png"
  counter=$((counter + 1))
done
```

This creates `screenshot-01.png`, `screenshot-02.png`, and so on. Use `%03d` for three-digit padding.

Replace spaces with hyphens and lowercase names:

```bash
for f in *.png; do
  mv "$f" "$(echo "$f" | tr ' ' '-' | tr '[:upper:]' '[:lower:]')"
done
```

## Batch resize with `sips`

`sips` (Scriptable Image Processing System) ships with macOS and handles resizing, conversion, and rotation.

### Width, preserving proportions

```bash
# Resize all PNGs to 1200px wide
sips --resampleWidth 1200 *.png
```

This edits files in place. Preserve originals first:

```bash
mkdir -p resized
cp *.png resized/
cd resized
sips --resampleWidth 1200 *.png
```

### Height

```bash
# Resize all PNGs to 800px tall
sips --resampleHeight 800 *.png
```

### Exact dimensions

```bash
# Force all images to exactly 1920x1080
sips --resampleHeightWidth 1080 1920 *.png
```

Exact resizing can distort images with a different aspect ratio. Prefer width or height resampling when proportions matter.

### Retina to 1×

A 1440×900 display produces 2880×1800 Retina screenshots. Halve each image’s width:

```bash
for f in *.png; do
  width=$(sips -g pixelWidth "$f" | tail -1 | awk '{print $2}')
  half=$((width / 2))
  sips --resampleWidth $half "$f"
done
```

## Batch format conversion

### PNG to JPEG

```bash
mkdir -p jpgs
for f in *.png; do
  sips --setProperty format jpeg "$f" --out "jpgs/${f%.png}.jpg"
done
```

### HEIC to PNG

```bash
mkdir -p pngs
for f in *.heic; do
  sips --setProperty format png "$f" --out "pngs/${f%.heic}.png"
done
```

### Supported formats

| Format | `sips` name | Notes |
|---|---|---|
| PNG | `png` | Lossless, large; default Mac screenshot format |
| JPEG | `jpeg` | Lossy, small; useful for photos and web uploads |
| HEIC | `heic` | Efficient compression; default on macOS Tahoe with HDR |
| TIFF | `tiff` | Lossless and very large; print workflows |
| GIF | `gif` | 256 colors maximum; not recommended for screenshots |
| BMP | `bmp` | Uncompressed; rarely needed on Mac |
| PDF | `pdf` | One-page PDF per image |

## Batch compression

A full-screen Retina capture can be 5–10 MB.

### JPEG quality with `sips`

```bash
mkdir -p compressed
for f in *.png; do
  sips --setProperty format jpeg --setProperty formatOptions 80 "$f" --out "compressed/${f%.png}.jpg"
done
```

Quality ranges from 0 (smallest/worst) to 100 (largest/best). For screenshots with text, 80–90 is a useful balance; below 70, JPEG artifacts begin to show.

### PNG compression with `pngquant`

`pngquant` can reduce PNG sizes by 50–80% with little visible quality loss:

```bash
brew install pngquant
pngquant --quality=65-80 --ext .png --force *.png
```

`--ext .png --force` overwrites originals. Remove those flags to save files with a `-fs8.png` suffix.

### Preview without Terminal

Select screenshots in Finder, choose **Open With > Preview**, select all images in Preview’s sidebar with `Cmd+A`, then choose **File > Export Selected Images**. Choose JPEG and adjust the quality slider.

## Batch watermarks

### Text watermark with ImageMagick

```bash
brew install imagemagick

mkdir -p watermarked
for f in *.png; do
  magick "$f" -gravity southeast -pointsize 24 \\
    -fill "rgba(255,255,255,0.5)" -annotate +20+20 "© YourCompany" \\
    "watermarked/$f"
done
```

### Logo watermark

```bash
for f in *.png; do
  magick "$f" logo.png -gravity southeast -geometry +20+20 \\
    -composite "watermarked/$f"
done
```

Set `-gravity` to `northwest`, `northeast`, `southwest`, `southeast`, or `center`.

## Strip metadata

Mac screenshots can contain usernames, hostnames, capture times, display information, and color profiles.

### Thorough removal with `exiftool`

```bash
brew install exiftool
exiftool -all= *.png
```

This removes EXIF, XMP, and ICC profile data. Originals are backed up with an `_original` suffix. Add `-overwrite_original` to skip backups.

### Basic removal with `sips`

```bash
sips --deleteProperty profile *.png
```

This removes the color profile and requires no installation, but is less thorough than `exiftool`.

## Automator Quick Action

1. Open Automator and create a **Quick Action**.
2. Set “Workflow receives current” to **image files** in Finder.
3. Add **Scale Images**, set width to 1200 pixels.
4. Add **Change Type of Images** for format conversion.
5. Save it as “Resize Screenshots 1200w.”

Select screenshots in Finder, right-click, choose **Quick Actions**, and run the workflow. For complex processing, add **Run Shell Script**; Automator passes selected files as arguments.

## Shortcuts workflow

On macOS Monterey and later:

1. Open Shortcuts and create a shortcut.
2. Add **Receive input from > Share Sheet > Images**.
3. Add **Resize Image**, set a target width such as 1200 px and height to **Auto**.
4. Add **Convert Image** if needed.
5. Add **Save File** for the output location.
6. Enable **Use as Quick Action** and **Finder**.

Shortcuts provides an intuitive builder and syncs across Macs via iCloud. It has fewer low-level options than Automator, but can call a shell script with **Run Shell Script**.

## Quick reference

| Task | Command |
|---|---|
| Resize to 1200 px wide | `sips --resampleWidth 1200 *.png` |
| PNG to JPEG | `sips -s format jpeg *.png --out ./jpgs/` |
| HEIC to PNG | `sips -s format png *.heic --out ./pngs/` |
| Halve Retina resolution | Loop with `sips -g pixelWidth` and `--resampleWidth` |
| Compress PNGs | `pngquant --quality=65-80 *.png` |
| Strip metadata | `exiftool -all= *.png` |
| Add text watermark | ImageMagick `magick` with `-annotate` |
| Rotate 90° clockwise | `sips --rotate 90 *.png` |
| Flip horizontally | `sips --flip horizontal *.png` |

## App Store screenshot sizes

| Device | Required portrait size |
|---|---:|
| iPhone 6.9" (16 Pro Max) | 1320 × 2868 |
| iPhone 6.7" (15 Plus/Pro Max) | 1290 × 2796 |
| iPhone 6.5" (14 Plus) | 1284 × 2778 |
| iPad Pro 13" | 2048 × 2732 |
| Mac | 1280 × 800 (minimum) |

Generate multiple device-size folders:

```bash
for size in "1320x2868" "1290x2796" "1284x2778"; do
  w=$(echo $size | cut -d'x' -f1)
  h=$(echo $size | cut -d'x' -f2)
  mkdir -p "$size"
  for f in *.png; do
    sips --resampleHeightWidth $h $w "$f" --out "$size/$f"
  done
done
```

This creates a folder for each size. Exact resampling stretches images when aspect ratios differ; design the base screenshots to suit the target sizes or use padding rather than stretching.

We capture and annotate screenshots in one step, so images are polished before batch processing for documentation or App Store submissions. LazyScreenshots is $29 one-time: [Try LazyScreenshots — $29 one-time](https://www.lazyscreenshots.com/).

## Related resources

- [How to Resize and Compress Screenshots on Mac (Without Losing Quality)](https://www.lazyscreenshots.com/blog/resize-compress-screenshots-mac/)
- [How to Create App Store Screenshots for Mac Apps: Sizes, Guidelines & Tools](https://www.lazyscreenshots.com/blog/app-store-screenshots-mac/)

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