Bulk resize + watermark guide

Familiar scenario: you just shot 100 product photos for your online shop, or 150 event photos for a client. You need to resize them to 1920px wide, add a small corner watermark, and rename them consistently IMG_001.jpg → IMG_100.jpg. By hand in Photoshop, that's 1-2 hours. With Image Optimizer it's ~30 seconds.

This post walks through a standard workflow for anyone batching images regularly: e-commerce, bloggers, photographers, marketing teams.

Step 1: Upload the batch

Three ways to get files in:

Drag-drop: pick a folder in Finder/Explorer and drag it onto the app's drop zone.
Click to browse: tap the drop zone or "Choose files" button → file picker opens → multi-select with Cmd/Ctrl+Click.
Keyboard: press Cmd + O (Mac) or Ctrl + O (Windows) to open the file picker from anywhere on the page.

The app accepts JPG, PNG, HEIC (iPhone), and WebP. No file count limit — in practice a batch of 200 × 5MB runs fine on an 8GB-RAM machine.

Step 2: Set up a preset once, reuse forever

This is the most important tip — don't reconfigure every time. Open Settings (gear icon, top-right), build your standard workflow:

Compression level: "Medium" for web, "Maximum" for thumbnails.
Format: WebP for the smallest size, JPEG for client compatibility.
Size: pick "Width" → enter 1920 (web full-width) or 800 (thumbnail).
Naming: prefix IMG_, enable "Numbering", start index at 1.
Watermark: see step 3.

Save the preset with the "Save preset" button → give it a name (e.g. "E-commerce 1920px + logo"). Next time, pick it from the dropdown. Export presets as JSON to share with your team or to use on another machine.

Step 3: Watermark — text vs PNG logo

Two watermark choices:

Text watermark

Fast and flexible. Good when:

You don't have a logo PNG yet.
You need to change wording often (e.g. © 2026 - John Doe Photography).
The brand name is the main element (no recognizable logo).

You can tweak: font size as a % of image width, color, opacity, position (4 corners + center).

Image watermark (PNG logo)

More professional. Upload a PNG logo (transparent background recommended). Tweakable:

Position: 4 corners + center.
Size: % of image width (5-30% is common).
Opacity: 0-100% (40-70% for subtle, 80-100% for prominent).

Multi-watermark

The app allows up to 5 watermarks per image. Use case: main brand logo bottom-right + capture date top-left + copyright text along the bottom. Each watermark has independent position, size, and opacity.

Drag-and-drop to reorder layers — later watermarks render on top of earlier ones.

Step 4: Naming conventions

Consistent file naming matters for SEO and folder organization. The app supports:

Prefix: IMG_, 2026-summer_, brand-name_
Suffix: _compressed, _web, _thumb
Numbering: auto-padding ensures correct sort order (001, 002, …, 100 rather than 1, 10, 100, 2).
Start index: continue from any number — handy when appending to an older batch.

Output can be IMG_001.webp → IMG_100.webp, sorted correctly in any file manager.

Step 5: Download + organize

When the batch finishes, two options:

Per-file download: handy when you only need a few.
Zip download: keyboard shortcut Cmd/Ctrl + S. The app handles name collisions by appending (1), (2)...

The folder inside the zip keeps the original upload order. Just extract.

Workflow for a wedding/event photographer

Real example from a working photographer:

Export 500 full-resolution JPEGs from Lightroom (2-3 GB).
Open Image Optimizer, load the "Client preview" preset (resize 2048px + watermark logo + naming EVENT_NAME_001).
Drag-drop the folder — app reports "500 files added".
Wait ~3 minutes (3 in parallel, ~3s each).
Download a ~300MB zip. Send to the client via WeTransfer.

Total hands-on time: ~30 seconds. The rest is the machine working.

Wrap-up

The biggest win in bulk processing is setting up the right preset once and reusing it. Spend 10 minutes building a preset → save hours on every shoot/batch.

Set up your bulk workflow now →