Bulk Image Upscaler
Upscale batches of AI art and regular images 2x, 3x, or 4x with Lanczos-sharp, Bicubic-smooth, or Bilinear-fast smoothing — 3x/4x run multi-step (halving per pass) into always-PNG output. Click any queued file for an original-vs-upscaled preview. Single files save as upscaled.png; batches as *-upscaled.png ZIPs — local Canvas work, 2 free batches a day.
Runs on CanvasJSZip
How to Use the Bulk Image Upscaler
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Frequently Asked Questions
Lanczos, Bicubic, or Bilinear for my batch?
Lanczos (sharp, high smoothing) for AI art, logos, and detailed illustrations — crisper edges at 3–4x. Bicubic (smooth, medium) for photos and gradients — fewer ringing artifacts on skin and skies. Bilinear (fast, low) for drafts. Scales above 2x run multi-step (ceil(scale/2) passes, e.g. 4x in 2 passes) instead of one jump.
2x, 3x, or 4x — how large should I go?
Match the output: 2x for retina web (1024→2048), 3x for large prints, 4x for posters from small AI outputs. A 1024px Midjourney piece at 3x prints sharp at 10 inches/300 DPI — beyond that, expect softness, not new detail.
Does upscaling add real detail?
No — interpolation enlarges cleanly but invents nothing, unlike AI reconstruction. Start from the largest clean source; upscaling a 256px thumbnail 4x gives a big soft image, while 1024px 2x stays crisp.
Does upscaling send images anywhere?
No — scaling runs locally in your browser on Canvas; images never leave your device. Only the final ZIP counts as one Pro download — the full upscaled set in a single save.
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Last updated October 2026