Open-source licenses

Velacompress runs entirely in your browser, built on the open-source components below. We thank their authors.

HEIC decoding: libheif and libde265

HEIC and HEIF images are decoded with libheif 1.23 and libde265, through the libheif-js 1.23.5 WebAssembly build. These libraries are licensed under the GNU Lesser General Public License v3.0, which supplements the GNU General Public License v3.0.

We use them unmodified. They are delivered as a separate file, loaded only when you convert a HEIC image, and can be replaced by another build of the same interface. Their complete source code is available at the links above. For a copy of the exact source we use, write to hello@velacompress.app.

Other components

• MozJPEG — JPEG encoding (via @jsquash/jpeg, Apache-2.0). IJG License, BSD-3-Clause, zlib License
• libwebp — WebP encoding (via @jsquash/webp, Apache-2.0). BSD-3-Clause
• libavif and libaom — AVIF encoding (via @jsquash/avif, Apache-2.0). BSD-2-Clause
• fflate — ZIP archives. MIT
• @noble/ed25519 — License key verification. MIT
• React, Next.js, Zustand, Framer Motion, TanStack Virtual, Sonner, clsx, tailwind-merge — Interface. MIT
• idb-keyval — Browser storage. Apache-2.0
• Serwist — Service worker tooling. MIT
• Lucide — Icons. ISC
• Geist — Typeface. SIL Open Font License 1.1