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Drop one or many images · automatic bulk mode for multiple files
Bulk supported. Drop multiple files and they'll be processed in a queue with a single ZIP download. Same settings apply to every file.
How to use
01
Drop the library
Add one image or hundreds. The queue works through files in order with per-file progress, so you can watch a long conversion move down the list while it runs.
02
Pick the target format and quality
Select PNG, JPG, or WEBP under Target format. JPG and WEBP expose a quality slider that defaults to 92 percent; PNG is lossless, so the slider disappears entirely.
03
Convert and collect the ZIP
The action button names your choice, for example Convert to WEBP. Batches download as a single archive such as converted-webp.zip, each file keeping its name with the new extension.
Why Bulk Image Converter
- Batch convert any number of images between PNG / JPG / WEBP.
- Drop one or hundreds, automatic queue with per-file progress.
- All processing client-side via Canvas. ZIP output for bulk.
Common questions
What happens to PNG transparency when I batch convert to JPG?
JPG has no alpha channel, so the converter fills the background with white before drawing each image. Logos and UI cutouts will sit on solid white in the output. If transparency matters, target WEBP instead, which carries alpha at a much smaller size than PNG.
Can the bulk image converter process mixed JPG and PNG sources together?
Yes, that's the point of it. Every file in the queue gets decoded and re-encoded to the single target you picked, so a messy folder of mixed formats comes out as one uniform set ready for a CDN or a CMS upload.
How should I set quality when I batch convert PNG to WEBP?
The 92 percent default is a strong starting point for photos and screenshots alike. Drop toward 80 for photographic content if you need more savings, but keep UI captures with fine text at 90 or above, since compression artifacts show up around sharp edges first.
Why is there no quality slider when PNG is the target?
PNG is a lossless format, so there's no quality tradeoff to tune; the pixels come out exactly as decoded. Expect bigger files than the lossy targets, which is why PNG output mostly makes sense for graphics that must stay pixel-perfect.
Does converting a whole batch change any image dimensions?
No. Each file is redrawn at its natural width and height, so a 2400 px screenshot stays 2400 px in the new format. Pair this tool with the Bulk Image Resizer when a migration needs both a format change and a size cap.
Is it safe memory-wise to convert multiple images at once in a browser?
Files are decoded onto a canvas one at a time, which keeps peak memory tied to your largest single image rather than the batch size. The ZIP itself does accumulate in memory though, so split a truly huge library into a few sessions.
Will duplicate base names collide after a bulk format conversion?
They can. Because only the extension changes, photo.png and photo.jpg both become photo.webp, and the later file wins inside the archive. Scan for twin base names before converting, or give the set unique names with the Bulk File Renamer first.