How many images can it handle?

There is no fixed limit — images are processed one at a time rather than all held in memory at once. A few hundred phone photos is a normal load; with very large batches keep the tab in the foreground, since browsers throttle background tabs.

Can the watermark go in a fixed spot?

Yes — any corner, the centre, or tiled across the whole image. The font size is a percentage of the image width, so the watermark looks the same relative size on large and small photos alike.

Will transparent areas turn black when converting to JPG?

No. JPG has no alpha channel, so the tool paints a white background first and transparent areas come out white rather than black. Choose PNG or WebP to keep transparency.

Does it hurt image quality?

Resizing uses the browser's high-quality resampling. The quality slider only affects JPG and WebP; the 85% default balances size against quality, and you can push it above 95% when quality matters most. PNG is lossless and has no quality setting.

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⚡Batch Image Processing - Resize, Watermark, Convert and Rename at Once

Preparing a batch of photos usually means shrinking them, stamping a watermark, converting the format and finally giving them tidy names — four tools for one job. Set it up once here and the whole batch runs through the pipeline in order, with the results packed into a single ZIP.

Free · No sign-up · Runs in your browserLast updated: 2026-10-26

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How to use Batch Image Processing

1Drop in a batch of images (a whole folder works)
2Switch on whichever of the four steps you need: resize, watermark, format, rename
3Click "Run the batch" and grab everything with "Download all (ZIP)"

FAQ

How many images can it handle?: There is no fixed limit — images are processed one at a time rather than all held in memory at once. A few hundred phone photos is a normal load; with very large batches keep the tab in the foreground, since browsers throttle background tabs.
Can the watermark go in a fixed spot?: Yes — any corner, the centre, or tiled across the whole image. The font size is a percentage of the image width, so the watermark looks the same relative size on large and small photos alike.
Will transparent areas turn black when converting to JPG?: No. JPG has no alpha channel, so the tool paints a white background first and transparent areas come out white rather than black. Choose PNG or WebP to keep transparency.
Does it hurt image quality?: Resizing uses the browser's high-quality resampling. The quality slider only affects JPG and WebP; the 85% default balances size against quality, and you can push it above 95% when quality matters most. PNG is lossless and has no quality setting.