FlipFormat — Private image converter

Convert HEIC/HEIF, JPG, PNG and WebP images into JPG, PNG or WebP entirely on your own computer. All files are processed inside the browser. No photo upload, accounts, tracking or backend.

HEIC and HEIF support

JPG, PNG and WebP need no decoder download. If your browser cannot read HEIC/HEIF natively, FlipFormat attempts to load a local decoder, and otherwise automatically downloads the pinned third-party heic2any v0.0.4 library from jsDelivr when you click Convert images. There is no separate enable button. This decoder is large (about 38 MB), so its first download may take some time. Subsequent loads may use the browser cache.

All photos stay on your device: neither Chemisode nor the CDN receives the photos. The third-party CDN receives a request for the library. The library is not included in this release ZIP, so first-time HEIC use requires internet access. If you need a genuinely self-hosted HEIC converter, use the included Windows or Mac/Linux setup script on an internet-connected computer. It verifies and splits the library into assets smaller than the Cloudflare Pages 25 MiB per-file limit before you re-ZIP and deploy. Consider your school's privacy requirements when using third-party code.

Convert photos

Drag photos onto the drop area or click Browse photos.
Select JPG, PNG or WebP and optionally adjust quality / output dimensions.
Click Convert images.
Download files one at a time, or click Download ZIP for the batch.

Important limits

HEIC → JPG and HEIC → PNG/WebP work with the decoder once available. JPG → HEIC is not supported; writing genuine HEIC needs a more specialised HEVC encoder.
EXIF information such as GPS position, original capture date and camera metadata is not copied into output images.
JPG has no transparency; transparent images will have a white background.
HEIC burst / multi-image files are converted using their first image.
Very large batches consume browser memory. Use smaller batches if necessary.
These instructions do not install a Chrome extension or upload photos to a service.

Dependencies

HEIC decoder: heic2any (MIT licence) by Alex Corvi. ZIP generation: JSZip (MIT/GPLv3), included locally. Conversion also uses native browser Canvas APIs.

This package was created for private, local use. Browser support and individual HEIC variants may differ; test several representative photos before relying on bulk output.

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