# Amazon Merch bulk prep: 200 designs in 5 minutes

URL: https://helpcenter.readypixl.com/articles/amazon-merch-bulk-prep
Markdown: https://helpcenter.readypixl.com/articles/amazon-merch-bulk-prep.md
Section: Workflows
Summary: End-to-end recipe for prepping print-on-demand designs for Amazon Merch — 4500 by 5400 pixels at 300 DPI, transparent PNG, batch-ready in one pipeline run.

This is one example workflow, for people who sell designs on Amazon Merch on Demand. The same idea works for any site with a fixed file spec — swap in that site's numbers. You have a folder of designs that need to become Amazon-Merch-ready. This article walks the full pipeline end-to-end.

If you can follow these 6 steps, you can prep 200 designs in the time it'd take to do 5 manually.

## What Amazon Merch wants

Amazon Merch has strict file specs. **Get these wrong and your design either gets rejected or printed badly.**

| Product | Pixel size | DPI | Format | Background |
| --- | --- | --- | --- | --- |
| Shirts (all types) | 4500 × 5400 | 300 | PNG | Transparent |
| Hoodies / Sweatshirts | 4500 × 5400 | 300 | PNG | Transparent |
| PopSockets | 1000 × 1000 | 300 | PNG | Transparent |
| Tote bags / Throw pillows | Check Merch's product spec page (varies) | 300 | PNG | Transparent |

Most shirt and apparel designs use the same **4500 × 5400 PNG with a transparent background.** Build your pipeline around that and you cover most of your batch.

*These numbers can change. Always confirm the current pixel size, DPI, and format on Amazon Merch's own product/spec page before you lock in a preset.*

## The pipeline

| Step | Tool | What it does |
| --- | --- | --- |
| 1 | **Color Removal V2** | Removes the solid background color, leaves it see-through |
| 2 | **Trim** | Cuts off the empty edges |
| 3 | **Reposition** | Places the design on a 4500 × 5400 canvas at 300 DPI |
| 4 | (Optional) **Watermark Image** | Adds your shop logo as proof-of-ownership before public posting |

That's the whole recipe. Drop folder, click Download All, get a zip ready to upload.

## Step-by-step

1. **Open the editor.** Go to readypixl.com — no signup needed if you'll do under 10 batches today.
2. **Drop your design folder in.** Drag the folder onto the drop zone, or click to pick files. Designs can be PNG or JPEG. The first design loads into the canvas as your live preview.
3. **Add Color Removal V2.** Click it in the tool sidebar. The default preset (Medium) and Auto-Trim (on) handle most designs with white or solid backgrounds.

   - **Tweak if needed:** if some background remains, bump the preset up to High (or raise Base Threshold). If part of your design gets eaten, drop the preset to Low (or lower Base Threshold). ([Color Removal V2 article](../pipelines/color-removal) for details.)
4. **Add Trim.** Default settings work — Tolerance 10, Padding 0. This cuts off the empty edges Color Removal V2 left behind.
5. **Add Reposition.** Settings:

   - Unit: **px**
   - Canvas Width: **4500**
   - Canvas Height: **5400**
   - DPI: **300**
   - Alignment: **Center**
   - Inside Padding: a small amount (gives Amazon a little room before they crop the upload)
6. **Click Download All.** The button appears in the canvas toolbar once you have 2+ images loaded. Watch the progress bar — typical 200-design batch finishes in 3-5 minutes on a modern machine.
7. **Save the pipeline as a preset.** Click **Save Current Preset** and name it something like *"Amazon Merch shirts."* Next batch loads with one click — no setup.
8. **Unzip and upload to Amazon Merch.** Original filenames are preserved, so you can match each output back to your source if needed.

## Common adjustments per product type

| Product | Pipeline change |
| --- | --- |
| Shirts / Hoodies / Sweatshirts | Use the recipe above as-is |
| PopSockets | Change Reposition to **1000 × 1000** instead of 4500 × 5400 |
| Other Merch products | Check Merch's design template page for the exact pixel spec, then change Reposition's Canvas Width / Canvas Height to match |

If you sell multiple product types, **save one preset per product spec.** Switch between them with a click — no re-setup needed.

## Tips

- **Do a single test design first.** Run the pipeline on 1-2 designs, open the output zip, check the result looks right before running on a big batch.
- **Designs with semi-transparent edges** (drop shadows, glows, fading effects) sometimes look wrong after Color Removal V2. Add **Transparency Cleaner** right after Color Removal V2 — leave it on the default setting and it cleans those up.
- **Designs with stray pixels** after background removal — add **Speckle Remover** between Color Removal V2 and Trim. Default Max cluster size 50 catches most leftovers.
- **For protecting designs you'll share online before they're listed**, add **Watermark Image** as the last step with your shop logo at 30-40% opacity.
- **For inconsistent batches** (designs from different sources at different sizes), Reposition normalizes everything to the same canvas. The result is a uniform batch ready for upload regardless of source variety.

## What to do if a design comes out wrong

- **Background not fully removed:** raise Color Removal V2's Base Threshold (or bump the preset to High), or add a second color for a second background color (designs with two-tone backgrounds).
- **Part of design eaten by Color Removal V2:** lower the Base Threshold (or drop the preset to Low), or turn ON Contiguous (only removes connected background, not same-color parts of your design).
- **Design too small on the canvas:** add a **Resize** step before Reposition, scale up to closer-to-target-size first.
- **Design positioned off-center:** check Reposition's **Alignment** (Center) and that the image hasn't been dragged off its position (double-click it to fill the canvas again).
- **Design got cropped:** lower Reposition's Padding setting, or check the source design fits within 4500 × 5400.

## What to read next

- **[The pipeline concept](../getting-started/pipeline-concept)** — the why behind chained tools
- **[Reposition](../pipelines/reposition)** — full reference for the canvas-sizing tool
- **[Color Removal V2](../pipelines/color-removal)** — full reference
- **[Printful and Printify bulk prep](printful-printify-bulk-prep)** — for vendor-specific templates