i.
Local by design
Conversion uses the browser's Canvas and WebAssembly APIs. No server endpoint accepts a file.
The online image converter:
without uploading them.
MediaBay is a free, fast image converter that converts your files JPG, PNG, WEBP, GIF, HEIC, AVIF right in your browser's memory. No upload. No server. No image of yours left lying around somewhere.
One rule. Just one.
Your files never leave your device. It's technically impossible — see for yourself.
0 files ready
Total size: —
Download on its way.
—
- Total time
- — ms
- Initial size
- —
- Final size
- —
- Bandwidth saved
- — no upload
— Error —
Conversion failed.
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N°02
The promise
Three guarantees for your image conversions.
The conversion code runs entirely in your browser. None of your images are ever uploaded; they stay in your RAM.
ii.
Every modern format
JPG, PNG, WEBP, GIF, BMP — plus the latest formats: iPhone HEIC and next-gen AVIF. Convert JPEG to PNG or HEIC to JPG in a single click.
iii.
Fast & offline
Once the page has loaded, cut your internet connection: conversion still works. An installable PWA is available for permanent access.
The best proof that your data stays with you is to see it for yourself.
Open F12 → tab Network → convert. Zero outbound requests carrying your image.
N°03
The comparison
MediaBay vs Other Converters.
Most online image converters upload your files to a server. MediaBay doesn't. Here's the difference, point by point.
| MediaBay | Other converters | |
|---|---|---|
| Transfer | MediaBay No upload — processed locally, in your RAM | Other converters Your files uploaded to a cloud server |
| Speed | MediaBay Instant — independent of your connection | Other converters Slow — capped by your network upload speed |
| Privacy | MediaBay Absolute — no file kept, no trace | Other converters Files stored temporarily on third-party servers |
| Limits | MediaBay No paywall — up to 100 MB per file, no watermark | Other converters Aggressive limits (often 5 MB) or forced watermarks |
N°04
Questions
Image Converter free : frequently asked questions.
How can I verify nothing is uploaded?
Open the DevTools (the F12 key in most browsers) → Network tab, then run a conversion (for example convert JPEG to PNG, or HEIC to JPG). You won't see a single outbound request containing your image. The code is open to inspection.
What's the maximum image size?
100 MB per file. The real limit depends mostly on the RAM available on your device — converting a 30 MB photo from JPEG to PNG works fine on a recent phone. Processing is fast because it's local, with no network transfer.
Why is this online image converter free?
The service is funded by ads displayed on the page. Your images, though, are never accessible server-side — they stay in your browser's memory, period. No upload, no watermark, no sign-up.
Is iPhone HEIC supported?
Yes — to convert HEIC to JPG, HEIC to PNG or HEIC to WebP, the libheif decoder is compiled to WebAssembly and run in a Web Worker. Converting an iPhone photo usually takes less than a second, with no upload.
What about offline mode?
Once the page has loaded, you can cut your internet connection: the converter still works. You can install MediaBay as an app (PWA) from your browser for permanent, fast access.
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Local · MediaBay
Your data stays on your device — don't close this tab.