Private batch image optimizer

Use cases

• Standardize a mixed product-photo batch before publishing
• Create JPEG, PNG, WebP or AVIF copies with consistent dimensions
• Apply one text or logo watermark and predictable filenames

One predictable pipeline instead of separate tools

The processing order is intentionally fixed: identify the file, correct JPEG orientation, resize, watermark, encode, rename and export. A fixed order makes a saved preset repeatable and prevents a watermark from being resized differently depending on which control was used first.

A failed image is isolated from the rest of the batch. Completed files remain available, and cancelling a batch stops unfinished work without uploading partial results.

Choose settings from the destination backward

Use JPEG for ordinary product photography when transparency is not needed. Use PNG for lossless interface graphics or logos, WebP for modern web delivery with optional alpha, and AVIF only when the destination accepts it and longer encoding time is acceptable.

• Confirm the marketplace's current pixel and file requirements before processing.
• Keep an original copy; conversion cannot restore detail already removed by an earlier JPEG encode.
• Review the generated files at 100% before replacing production assets.

Marketplace preparation is not marketplace publishing

BatchMint can normalize widths, backgrounds, watermarks and filenames, but Shopify, Etsy and Amazon apply their own validation, delivery transforms and category rules. The links below are the official sources checked for this page on July 17, 2026.

How local browser processing works

The browser passes each selected File to a local Web Worker. The worker reads orientation, decodes pixels, resizes, applies an optional watermark and runs the selected WASM encoder. Completed Blobs are returned to the page for preview and download; selected image bytes, filenames and watermark text are not included in BatchMint application network requests.

Selected images, filenames and watermark text are not sent to a BatchMint processing server. The browser still requests the site code, styles and codec assets used on demand.

How to use it

1. Choose up to 20 JPEG, PNG or WebP images.
2. Set output format, maximum width, optional target size and watermark.
3. Process locally, compare selected before/after results and export files or ZIP volumes.

Sources and verification dates

Platform rules can change. Marketplace requirements below link to official pages, with the retrieval date and scope recorded for each source.

• Shopify Help Center — Uploading images

  Official format, delivery, color-profile and theme-image upload guidance; checked July 17, 2026.

• Etsy Help Center — Image requirements and best practices

  Official listing-photo formats, dimensions, transparency and thumbnail guidance; checked July 17, 2026.

• Amazon Seller Central — Product image guide

  Official product-image and main-image rules; Seller Central may require sign-in and category rules can differ. Checked July 17, 2026.

Limitations

• The current batch limit is 20 images.
• Animated images, RAW, PSD, TIFF and HEIC input are not supported in the deployed workspace.
• Marketplace acceptance still depends on the destination's current rules and category requirements.

FAQ