About OneDropConvert
OneDropConvert is a set of free image tools for everyday problems: an iPhone photo that won't open on Windows, a WebP that a form won't accept, a picture too big for an upload limit, or a handful of photos that need to become one PDF.
Why local conversion matters
Most online converters upload your files to a server, convert them there and send them back. That works, but it means your photos, scans and documents sit on someone else's computer, and you have to trust what happens to them next.
We built OneDropConvert the other way round. Modern browsers are powerful enough to decode and encode images themselves, and open-source libraries compiled to WebAssembly cover the formats browsers can't handle on their own, like HEIC. So the whole conversion happens on your device. Your files are never uploaded. Our site's security policy only lets the page connect to our own server and, if you accept analytics cookies, Google Analytics, and neither ever receives your files.
A nice side effect: it's fast. There's no upload queue, so a batch of photos is usually done in seconds.
What we promise
- Your files never leave your device.
- Location data and other hidden metadata are removed from converted images.
- No watermarks, and no sign-up for the free plan: 10 conversions a day. Pro is unlimited.
- Plain, specific language, and no claims we can't back up.
Who builds it
OneDropConvert is a product of Pacific Digital, a website and marketing agency.
Open-source credits
OneDropConvert stands on the shoulders of excellent open-source projects. The following run in your browser when you use the tools. Each is used unmodified and remains under its own licence; LGPL components are loaded as separate files so they can be replaced.
| Project | Licence | Used for |
|---|---|---|
| libheif-js 1.23.2 | LGPL-3.0 | HEIC/HEIF decoding (WebAssembly build of libheif and libde265, used unmodified). |
| @jsquash/avif 2.1.1 | Apache-2.0 | AVIF decoding fallback (libavif/dav1d compiled to WebAssembly). |
| @jsquash/webp 1.5.0 | Apache-2.0 | WebP encoding fallback (libwebp compiled to WebAssembly). |
| wasm-feature-detect 1.9.0 | Apache-2.0 | Picks the fastest WebP encoder your browser supports. |
| browser-image-compression 2.0.2 | MIT | PNG colour reduction (includes UPNG.js and uzip, MIT). |
| pdf-lib 1.17.1 | MIT | Creating PDFs (includes pako, MIT/Zlib, and tslib, 0BSD). |
| fflate 0.8.3 | MIT | Building ZIP downloads. |
| Sen typeface 5.3.0 (@fontsource/sen) | SIL OFL 1.1 | The site font, self-hosted. |
The site itself is built with Astro (MIT). Full licence texts are listed in THIRD_PARTY_LICENSES.md in the project source.