Bulk Image Resizer

Resize hundreds of images at once — max-dimension constraint, output format, download all as a zip. 100% in your browser.

100% in your browser — files never uploaded.
Postcrest — full AI image suite

Need more than a converter? AI background removal, upscale, edit and generate — one workspace.

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How to use the Bulk Image Resizer

  1. 1
    Drop your images
    Drop a folder or pick a batch.
  2. 2
    Set max dimension
    Longest side is constrained, aspect ratio preserved.
  3. 3
    Process + download zip
    Or download individually.

About this tool

All processing happens in your browser. No upload.

Aspect ratio is always preserved — the longest side hits the max-dimension cap.

Frequently asked questions

How many files?
Hundreds — limited only by your device's memory.
Are files uploaded?
No — every step runs in your browser.
Zip download?
Yes — packed via JSZip, in-browser.
Commercial use?
Yes — output is yours.
Mobile-friendly?
Yes.

Need more than free tools? Get Postcrest's full AI image suite.

AI background removal, AI upscaling, AI image editor and AI photoshoot — every leading model in one workspace.

AI Image Generator
Every leading model — Flux, Nano Banana, Seedream, GPT-Image, SDXL.
AI Image Editor
Inpaint, outpaint, object removal — describe the edit, AI applies it.
AI Background Remover
Pixel-perfect cutouts in seconds — transparent PNG or any new scene.
AI Image Upscaler
Upscale to 4K, face-aware, print-ready, watermark-free.
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