Built on open source.
convert.now's in-browser conversions are powered by open-source codecs and libraries. Their licenses (BSD, MIT, Apache-2.0, MPL, LGPL) require attribution when the software is distributed — so here are the components convert.now ships to your browser, and their licenses.
First-party code
The convert.now application and its own code — the codecs, container readers/writers, UI and site — are © 2026 convert.now, all rights reserved. The third-party components below retain their own licenses, which govern those components.
AV1 / AVIF royalty notice
AVIF support is built on the AV1 video codec via the rav1e encoder, dav1d decoder and libavif. AV1 is published by the Alliance for Open Media (AOMedia) under a royalty-free patent license, and the encoder and decoder are distributed under BSD-2 / BSD-3-Clause licenses.
Apache-2.0 NOTICE
Several components — PDF.js, SheetJS, the jSquash codec wrappers, and Google's Highway (used inside the JPEG / JPEG XL codecs) — are licensed under the Apache License 2.0. Where those projects ship a NOTICE file, its attributions are preserved as required by Section 4(d) of the license.
JavaScript libraries
These libraries ship to your browser as part of the tools.
| Component | License | Used for |
|---|---|---|
| pdf-lib | MIT | PDF creation, merging and editing. |
| @cantoo/pdf-lib | MIT | Maintained pdf-lib fork used for PDF editing. |
| PDF.js (pdfjs-dist) | Apache-2.0 | PDF parsing and rasterization (Mozilla). |
| SheetJS (xlsx) | Apache-2.0 | Spreadsheet reading and writing. |
| hyparquet | MIT | Apache Parquet reader. |
| hyparquet-writer | MIT | Apache Parquet writer. |
| fflate | MIT | DEFLATE / ZIP / GZIP compression for the archive tools. |
| client-zip | MIT | Streaming ZIP creation for batch downloads. |
| utif | MIT | TIFF decoding. |
| js-yaml | MIT | YAML parsing and serialization. |
| fast-xml-parser | MIT | XML parsing. |
| papaparse | MIT | CSV parsing. |
| jSquash codec wrappers | Apache-2.0 | WebAssembly image-codec wrappers. |
| @vercel/analytics | MPL-2.0 | Cookieless, aggregate web analytics. |
| @vercel/speed-insights | Apache-2.0 | Anonymous Core Web Vitals reporting. |
HEIC/HEVC is not supported and no libheif or HEVC codec is distributed.
WebAssembly codecs
The in-browser codecs compile and wrap these upstream open-source projects.
| Component | License | Used for |
|---|---|---|
| libjxl / jpegli (JPEG XL Project Authors) | BSD-3-Clause | JPEG and JPEG XL encode/decode. |
| libjpeg-turbo | BSD-style (IJG) | JPEG API used by jpegli. |
| Highway (Google) | Apache-2.0 | SIMD acceleration in the JPEG / JPEG XL codecs. |
| Brotli (Google) | MIT | Entropy coding for JPEG XL and WOFF2. |
| libwebp / libsharpyuv (Google) | BSD-3-Clause | WebP encode/decode. |
| rav1e + ravif | BSD-2 / BSD-3-Clause | AVIF (AV1) encode. |
| dav1d (VideoLAN) | BSD-2-Clause | AV1 decode for AVIF. |
| libavif (AOMedia) | BSD-2-Clause | AVIF container handling. |
| libtiff (Sam Leffler / SGI) | libtiff (BSD-like) | TIFF encode/decode. |
| zlib | Zlib | Deflate compression (TIFF, fonts). |
| image PNG codec (Rust) | MIT / Apache-2.0 | PNG encode/decode. |
| oxipng + libdeflate | MIT | Lossless PNG optimization. |
| resize (Rust) | MIT | High-quality image resizing. |
| woff2 (Google) | MIT | TTF/OTF ↔ WOFF2 font conversion. |
| crc32fast (Rust) | MIT / Apache-2.0 | Checksums for ZIP output. |
| Transitive Rust crates (miniz_oxide, fdeflate, rgb, imgref, avif-serialize, …) | MIT / Apache-2.0 / Zlib | Support code for the codecs above. |
Copyleft components — source availability
Two audio dependencies carry copyleft licenses. They are used unmodified, exactly as published. As their licenses require, the license text travels with the bundle and the upstream source is linked below.
- lamejs — LGPL-3.0. JavaScript port of the LAME MP3 encoder; used only for MP3 output, unmodified. Source: github.com/breezystack/lamejs. License text: gnu.org/licenses/lgpl-3.0.txt.
- mediabunny — MPL-2.0. Audio container muxing/demuxing and WebCodecs orchestration; used unmodified. Source: github.com/Vanilagy/mediabunny. License text: mozilla.org/MPL/2.0.