About the tool
About this private bulk image converter.
BulkMediaConvert is a focused browser utility for people who need a whole folder compressed, resized, or converted before it moves to its next destination.
The core idea
Your images should not need a round trip to become lighter.
Processing happens locally with browser workers and WebAssembly. The result is a practical balance of privacy, control, and speed.
Private by design
Your selected files stay in the browser. There is no upload queue, account, or server-side image library.
Made for batches
Work with up to 100 images at a time, review each result, and download individual files or a ZIP.
Useful control
Choose output format, quality, scale, and metadata handling instead of accepting a black-box result.
Clear feedback
The queue shows progress, status, original size, output size, and format so decisions stay visible.
A simple workflow
From folder to finished files.
01
Select
Drop a batch or choose files from your device.
02
Tune
Set format, quality, scale, and metadata preferences.
03
Review
Compare output sizes, then download files or a ZIP.
Frequently asked questions
Bulk image converter FAQs
Answers about batch compression, WebP and AVIF conversion, resizing, quality, supported formats, and privacy.
No. BulkMediaConvert processes images in your browser using client-side WebAssembly. Your image files are not sent to a conversion server or stored by this tool.
You can add up to 100 images to one batch. The browser processes up to five images concurrently, so performance depends on your device, browser, image dimensions, and available memory.
You can add PNG, JPG, JPEG, WebP, AVIF, and HEIC files. Output options are the original format, PNG, JPG, WebP, or AVIF.
Yes. Choose WebP or AVIF as the global output format, or set a different format for an individual image, then select Process. PNG, JPG, JPEG, WebP, and AVIF inputs are supported; HEIC decoding is not currently available.
Yes. Set the batch scale to 25%, 50%, 75%, or 100%, adjust quality, and optionally remove metadata. These settings apply when you process the queued images.
Add up to 100 supported images, choose an output format and quality, then select Process. The browser processes the batch locally, and you can download finished images individually or as a ZIP.
No setting can guarantee a smaller file with no visual change for every image. Quality settings let you choose a trade-off; keep the originals and check exported images before replacing them.
It works in modern browsers that support WebAssembly. Large or high-resolution batches may need more memory, so smaller batches can be more comfortable on mobile devices.
HEIC files can be detected and added to the queue, but HEIC decoding is not included in the current browser build. HEIC items will show an error; use PNG, JPG, WebP, or AVIF for successful processing.