LocalPixelBench
Convert, resize and optimize images entirely in your browser.
Drop images or a whole folder here
JPEG, PNG, WebP, AVIF, GIF, BMP, HEIC/HEIF — no limit on count or size
Why this exists
I kept running into the same wall on free converter sites - ads everywhere, a cap of 20 files, a nag screen asking me to pay for batch processing. After converting 70+ images in a single afternoon, I built my own. It does more than the paid tiers of those tools, it's free, and your images never leave your computer.
- Nothing is uploadedProcessing happens in your browser, not on a server.
- No limitsNo file count cap, no size cap, no watermark, no account.
- Normally-paid featuresBatch processing and target-size compression, free.
Privacy
Why nothing is uploaded
Your images are processed in your browser and are never uploaded. No server ever receives your files — there's no account, no email, and no file retention, because there's nothing to retain.
The page itself is served from my host, so ordinary web traffic exists to load this app. Everything it needs — the code and the format decoders — is downloaded once from my own domain, never a third-party CDN. No image or file content ever leaves this page; anonymous usage counters are sent separately, as described below.
This page also works installed as an app and fully offline — that's not a policy promise, it's a testable claim. Install it from your browser's menu, disconnect from the internet, and keep converting.
Your files never leave this device. I collect anonymous, aggregated usage events — such as which tool was used, roughly how many images, and whether processing succeeded — to decide what's worth improving. Filenames, images, metadata, and file contents are never collected, and events aren't tied to you or your device in any way.