How to Convert Multiple ECW Images to AVIF?
1. Download and Install reaConverter
First, grab reaConverter from the download button below. Installation is fast, and the software runs offline — no account or signup needed. Need edits? Resize, rotate, or add watermarks during conversion.
2. Load your ECW files
Add your ECW files to reaConverter. Whether it's a handful or an entire archive, the batch engine processes them efficiently.
Browse for files, drag them in, or add entire folders at once. reaConverter queues everything automatically.
3. Select AVIF as output format
Pick AVIF as the output format. Set the destination folder and optionally configure resolution, quality, or file naming.
4. Start ECW to AVIF conversion
Start the conversion with one click. reaConverter handles everything and notifies you when it's done.
When the batch finishes, your AVIF files are ready in the destination folder you chose earlier.
What changes when you convert ECW to AVIF
ECW describes geometry rather than pixels, so it has no inherent resolution. The conversion renders it at whatever size you choose, and that choice is final: enlarging the AVIF afterwards will not recover the sharpness. Set the output dimensions or DPI before converting, not after. ECW carries 16 bits per channel and AVIF carries 12, so tonal steps get coarser during conversion. It shows up first in smooth gradients such as skies. If the result will be edited further, move to a 12-bit format only at the very end.
