How-To

Batch Convert Multiple Images at Once

April 7, 2025·4 min read

Converting images one by one is tedious and time-consuming when you have dozens or hundreds of files. Batch conversion lets you process an entire folder of images in a single operation, converting them all to your desired format with consistent settings. Here is how to do it efficiently with the right tools.

When you need batch conversion

Common scenarios include migrating a website from PNG to WebP, preparing a product catalog for an e-commerce platform, converting HEIC photos from an iPhone backup, or standardizing image formats across a team. Any time you have more than five or ten images to convert, batch processing saves significant time.

Desktop tools for batch conversion

IrfanView and XnConvert are popular free desktop tools for batch image conversion. They let you select a folder, choose output format and quality, apply resize rules, and process everything at once. The advantage of desktop tools is speed for very large batches, as there is no upload or download time involved.

Online batch conversion

SquishConvert Pro supports batch conversion with ZIP export. Upload multiple files, select your output format, and download all converted files as a single ZIP archive. This is ideal when you do not want to install software or need to work from a shared computer, tablet, or phone.

Maintaining quality across batches

Test your quality settings on a few representative images before processing the entire batch. What works for photos may not work for screenshots or diagrams. Use format-appropriate settings: JPG at quality 85 for photos, PNG-8 for simple graphics, WebP at quality 80 for mixed content. Check a random sample of output files to verify results.