Batch Convert
Convert many images to JPG, PNG, WebP, or AVIF at once. Drag, drop, download zip.
Convert many images to JPG, PNG, WebP, or AVIF in one go and download them all as a single ZIP. Built for the moment you have a folder of photos to standardize, screenshots to optimize for the web, or a mixed pile of formats to unify, without converting them one tedious file at a time.
The whole batch is processed in your browser. No image is uploaded; each file is converted locally and packed into a ZIP on your device. There's no upload queue and no per-file size limit beyond your own memory, so large batches run as fast as your machine allows.
Drop images to convert in bulk
Mix any formats · download as a ZIP · nothing uploads
🔒 100% Browser-Based
Your image is processed entirely in your browser. Nothing is uploaded. Verify in DevTools → Network tab — zero outbound traffic with file content.
About Batch Convert
Convert many images to JPG, PNG, WebP, or AVIF in one go and download them as a ZIP. Mix any input formats. Everything runs locally in your browser.
How to use the Batch Convert
- 1
Add all your images
Drag in the entire set at once, mixed formats are fine. Everything loads locally; nothing is sent to a server.
- 2
Choose the target format
Pick one output format for the whole batch: JPG for universal use, PNG for transparency, WebP or AVIF for the smallest web files.
- 3
Set quality once
For lossy outputs, set a single quality level that applies to every file, so the batch comes out consistent.
- 4
Convert and download the ZIP
The tool processes each image locally and bundles the results into one ZIP. Save it and you're done.
Pick the right output for the whole set
Because batch conversion applies one format to everything, choose based on where the images are headed. JPG for general sharing and maximum compatibility. PNG if any image needs transparency or is a screenshot or graphic with sharp edges. WebP to cut web page weight by 25-35% while keeping broad browser support. AVIF when you want the absolute smallest files and your destination supports it.
One caveat with mixed batches: forcing transparent PNGs into JPG flattens their transparency onto a solid background. If some images rely on a transparent background, use WebP or PNG for the whole batch so nothing gets an unwanted backdrop.
Why local batch processing scales better
Server-based batch converters have to upload every file, process them in a shared queue, then let you download, slow, capped, and a privacy risk when the images are personal or confidential. Doing it all in the browser removes the upload entirely. The only network activity is loading the page; after that you could disconnect and still convert.
That changes what's practical. A hundred photos don't wait in line behind other users, there's no upload time-out on large files, and sensitive images never sit on a third party's disk. The trade-off is that processing uses your device's CPU and memory, so extremely large batches go faster on a stronger machine.
Quick tips
- ✓Standardize a messy folder by converting everything to one format, it makes later sorting, uploading, and previewing far simpler.
- ✓For a website image set, batch to WebP at quality 80, you'll typically cut total page weight by about a third in one pass.
- ✓Avoid JPG output if any source image has transparency; the whole batch would get a solid background baked in.
- ✓Convert in smaller groups if a huge batch slows your browser, memory, not format, is the real constraint here.
- ✓Set quality once and review a single result before running the full batch, so you don't reprocess everything to fix the level.
Frequently asked questions
Can I mix input formats?
Yes — drop in any combination of JPG, PNG, WebP, AVIF, GIF, or BMP and convert them all to one target format.
Which format should I pick?
JPG for universal photos, PNG for transparency, WebP for small web files, AVIF for the smallest high-quality files (Chrome/Edge).
Is anything uploaded?
No. All conversion happens in your browser; files never leave your device.
Can the input files be different formats?
Yes. You can drop in a mix of JPG, PNG, HEIC, WebP, and more; they all convert to the single output format you choose and land in one ZIP together.
Why is the conversion slower than a typical website?
Because the work happens on your own device, not a server farm. Speed depends on your CPU, memory, and batch size, but you gain privacy and no upload wait in return.
Are the original filenames kept in the ZIP?
Generally the converted files keep their base names with the new extension, so File.png becomes File.webp, making it easy to match outputs back to your originals.