What Is the IMG369 Batch Image Converter?
Batch Image Converter changes the file format of up to 20 photos at once, so you don't have to convert them one at a time. Pick JPG, PNG, or WEBP as the target, and every photo in the batch gets converted together, regardless of what mix of formats they started as.
It's the multi-file version of IMG369's single-image Image Converter, aimed at the situation where a whole folder needs the same treatment: a batch of scanned PNGs that need to be JPGs for a smaller upload, or a set of camera JPGs that need to become WEBP for a faster-loading web page.
How It Works
Each photo is decoded and redrawn onto a canvas, then re-exported in the format you chose, all using the Canvas API entirely in your browser. Nothing is uploaded to a server, and every image is processed independently so one bad or corrupted file won't stop the rest of the batch from converting.
Choosing a Target Format
JPG is the right default for photos where small file size matters more than perfect fidelity, and it's still the most universally accepted format by older software and platforms. PNG is lossless and supports transparency, so it's the right choice for screenshots, graphics with text, or anything with a transparent background, at the cost of a noticeably larger file for photo content. WEBP generally gives you the smallest file size at a comparable quality to JPG, and it supports transparency too, but it's a newer format that a small number of older tools and platforms still don't accept, so it's worth checking your destination supports it before converting a whole batch.
Common Uses
Converting a folder of PNG screenshots to smaller JPGs before sharing them over email or chat, preparing a batch of camera photos as WEBP for a website where page load speed matters, standardizing a mixed folder of images (some JPG, some PNG, some WEBP) down to a single consistent format before archiving, or converting a set of transparent PNG graphics to JPG on a white background for a platform that doesn't support transparency.
IMG369 vs. Other Ways to Convert a Batch of Photos
Command-line tools like ImageMagick can batch-convert extremely well, but they require installing software and being comfortable typing commands, a real barrier for anyone who isn't already technical. Free online batch converters handle the format-picking without the command line, but they need your whole folder uploaded to their server first. Converting one file at a time using your OS's "Save As" or "Export" dialog works for two or three images, but becomes genuinely slow past that. IMG369 converts up to 20 photos in one pass, in the browser, with nothing uploaded.
| Method | Cost | Photos leave your device | Technical skill needed |
|---|---|---|---|
| IMG369 | Free | No | None |
| ImageMagick / command line | Free | No | High |
| Typical online batch converter | Free with limits, paid for more | Yes, uploaded to a server | None |
| Manual "Save As" per file | Free | No | None, but slow past a few files |
Summary
IMG369's Batch Image Converter changes up to 20 photos to JPG, PNG, or WEBP in one pass, with individual downloads or a one-click ZIP, entirely inside your browser with no upload and no signup. The sections above cover how to pick the right target format for your use case; the FAQ below covers transparency handling and download options.
Frequently Asked Questions
Is the Batch Image Converter really free?
Yes. There's no signup, no watermark, and no limit on how many images you convert. Everything runs on your own device.
Do my images get uploaded anywhere?
No. Every conversion happens using the Canvas API entirely in your browser. Nothing is sent to a server.
How many images can I convert at once?
Up to 20 images per batch.
What happens to transparency when converting to JPG?
JPG doesn't support transparency, so any transparent areas are filled with white before converting.
How do I download all the converted images?
Click "Download All as ZIP" to get every converted image in one file, or download each one individually from its own card.