Image & Data
Bulk Image Resizer
Resize hundreds of images at once by width, height, longest side, or percentage — all on your device.
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Transparent methodology
What the result includes—and what it does not
Built for people resizing whole folders of photos for catalogs, websites, or archives.
Calculation method
- 1Each image is decoded and redrawn on your device at the target geometry (longest side, width, height, or percentage) with high-quality resampling.
- 2Aspect ratio is always preserved; "never upscale" caps output at the original size.
- 3Output format can be kept or converted to JPG, WebP, or PNG; batches run in parallel workers and download as ZIP.
Assumptions and limits
- JPG and WebP outputs are lossy at the selected quality; PNG output is lossless but heavier.
- Resizing re-encodes pixels, so embedded metadata is not preserved — use the metadata remover if that is the goal.
Worked example
300 catalog photos to 2048 px
Input: 300 JPGs resized by longest side to 2048 px, keep format.
Output: 300 resized JPGs in a ZIP, each within 2048 px on its longest side.
How to use it
Three steps. One clear answer.
- 1Enter or paste the values requested by the tool.
- 2Review the input units and choose any relevant options.
- 3Calculate, then copy or download the result you need.
Built for trust
Useful without the friction.
- No registration or paywall before your result.
- Responsive controls for phone, tablet, and desktop.
- Clear assumptions and warnings where estimates have limits.
Frequently asked questions
How does the Bulk Image Resizer work?
Each image is decoded and redrawn on your device at the target geometry (longest side, width, height, or percentage) with high-quality resampling. Aspect ratio is always preserved; "never upscale" caps output at the original size. Output format can be kept or converted to JPG, WebP, or PNG; batches run in parallel workers and download as ZIP.
What should I check before using the result?
JPG and WebP outputs are lossy at the selected quality; PNG output is lossless but heavier. Resizing re-encodes pixels, so embedded metadata is not preserved — use the metadata remover if that is the goal.
How current is this page?
The methodology and source notes were reviewed on 2026-07-26. Editable rates and inputs should still be checked against the provider or authority linked below.
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