Built On Open Source

Astro7.3.8

Static site framework and client router.

MIT© Fred K. Schott and contributors

React19.3.0

Interactive tool workspaces.

MIT© Meta Platforms, Inc. and affiliates

React DOM19.3.0

MIT© Meta Platforms, Inc. and affiliates

Tailwind CSS4.3.3

Utility CSS (compiled into the stylesheet).

MIT© Tailwind Labs, Inc.

Workbox7.4.1

Service worker: offline app shell and caching (precaching, routing, strategies, expiration).

MIT© Google LLC

Zustand5.0.15

Client state.

MIT© Paul Henschel

dnd kit (core)6.3.1

Accessible drag-and-drop reordering in merge tools.

MIT© Claudéric Demers

dnd kit (sortable)10.0.0

MIT© Claudéric Demers

dnd kit (utilities)3.2.2

MIT© Claudéric Demers

Phosphor Icons2.1.1

Interface icons (SVG paths inlined at build).

MIT© Phosphor Icons

three.js0.186.1

Hero light-beam scene (loaded lazily on large screens).

MIT© three.js authors

Anton5.3.0

Heavy condensed type for meme captions and display watermarks (self-hosted via Fontsource). SIL Open Font License 1.1.

OFL-1.1© Vernon Adams

Inter Variable5.3.0

Interface typeface, self-hosted via Fontsource. SIL Open Font License 1.1.

OFL-1.1© The Inter Project Authors (Rasmus Andersson)

JetBrains Mono5.3.0

Monospace option for text burned into videos (self-hosted via Fontsource). SIL Open Font License 1.1.

OFL-1.1© JetBrains s.r.o.

Nunito5.3.0

Rounded option for text burned into videos (self-hosted via Fontsource). SIL Open Font License 1.1.

OFL-1.1© Vernon Adams, Cyreal, Jacques Le Bailly

Playfair Display5.3.0

Serif option for text burned into videos (self-hosted via Fontsource). SIL Open Font License 1.1.

OFL-1.1© Claus Eggers Sørensen

@ffmpeg/util0.12.2

MIT© Jerome Wu

ffmpeg.wasm (@ffmpeg/ffmpeg)0.12.15

JavaScript wrapper and worker for the FFmpeg core.

MIT© Jerome Wu and ffmpeg.wasm contributors

Mediabunny1.61.3

Media demuxing/muxing and WebCodecs pipelines.

MPL-2.0© Vanilagy

FFmpeg (ffmpeg.wasm core)0.12.10

FFmpeg 5.1.4 compiled to WebAssembly with x264, x265, libvpx, LAME, libopus, libvorbis, libtheora, libwebp, libass, freetype, fribidi, harfbuzz, zimg, zlib. Served from /engines/[email protected]/; corresponding source offered per the deploy README. Downloaded only when a tool needs it.

GPL-2.0-or-later© FFmpeg developers, x264/x265 authors, ffmpeg.wasm contributors

FreeType

Inside the FFmpeg core.

FTL or GPL-2.0

FriBidi

Inside the FFmpeg core.

LGPL-2.1-or-later

HarfBuzz

Inside the FFmpeg core.

MIT

Inter (subtitle font)

public/fonts/Inter-Regular.ttf, family name "Inter". Licence text: /fonts/Inter-OFL.txt.

OFL-1.1

libass

Subtitle rendering inside the FFmpeg core.

ISC

libavif + libaom

Inside @jsquash/avif.

BSD-2-Clause / BSD-3-Clause (AOM patent licence)

libjxl

Inside @jsquash/jxl.

BSD-3-Clause

libvpx

Inside the FFmpeg core.

BSD-3-Clause

libwebp

Inside @jsquash/webp.

BSD-3-Clause

MozJPEG

Inside @jsquash/jpeg.

IJG / BSD-3-Clause / zlib

oxipng

Inside @jsquash/oxipng.

MIT

pako

Deflate support for UTIF.

MIT AND Zlib

x264

Inside the FFmpeg core.

GPL-2.0-or-later

exifr7.1.3

EXIF/XMP/IPTC/GPS reading.

MIT© Mike Kovařík, Mutiny.cz

gifenc1.0.3

GIF encoding.

MIT© Matt DesLauriers

heic-to1.6.5

HEIC/HEIF decoding where the browser has none; separate lazily loaded, replaceable chunk.

LGPL-3.0© hoppergee; libheif & libde265 authors (struktur AG)

imagetracerjs1.2.6

Raster-to-SVG tracing.

Unlicense© András Jankovics

jSquash (MozJPEG, libwebp, libavif/aom, libjxl, OxiPNG, resize)1.6.0

WebAssembly image codecs, each loaded on first use.

Apache-2.0© Jamie Sinclair; codec authors (Mozilla, Google, AOMedia, JPEG XL authors, OxiPNG authors)

LibRaw-Wasm1.6.0

RAW to JPG full decode, loaded only when needed. LibRaw is dual-licensed LGPL-2.1 / CDDL-1.0; its unmodified WebAssembly build runs as a separate lazily loaded module.

ISC AND (LGPL-2.1-only OR CDDL-1.0)© Yassine Bouane (wrapper); LibRaw LLC (LibRaw)

modern-gif2.1.0

GIF decoding where ImageDecoder is missing.

MIT© wxm

pdf-lib1.17.1

Images to PDF.

MIT© Andrew Dillon

Tesseract.js7.0.0

On-device text recognition (OCR). Worker + LSTM cores (tesseract.js-core) are served from /engines/; language packs (tessdata_best int, Apache-2.0) download from jsDelivr after consent.

Apache-2.0© Project Naptha; Tesseract OCR authors (Apache-2.0)

UTIF.js (utif2)4.1.0

TIFF decode/encode.

MIT© Photopea

@mediabunny/aac-encoder1.61.3

Loaded only when the browser has no native AAC encoder.

MPL-2.0 (bundles FFmpeg AAC encoder, LGPL-2.1+)© Vanilagy; FFmpeg developers

@mediabunny/flac-encoder1.61.3

Loaded only for FLAC output.

MPL-2.0 (bundles libFLAC, BSD-3-Clause)© Vanilagy

@mediabunny/mp3-encoder1.61.3

Loaded only for MP3 output. MP3 encoding by the LAME project — https://lame.sourceforge.io

MPL-2.0 (bundles LAME 3.100, LGPL-2.0+)© Vanilagy; LAME project

RNNoise (WASM)2025.1.5

WebAssembly build of RNNoise.

Apache-2.0© Shiguredo Inc.; Xiph.Org Foundation, Jean-Marc Valin (RNNoise, BSD-3-Clause)

SoundTouchJS core2.1.1

WSOLA time-stretch for speed, pitch and voice effects (streamed). MPL-2.0: unmodified, source at the project URL.

MPL-2.0© SoundTouchJS contributors; SoundTouch by Olli Parviainen

chardet2.2.0

Detects subtitle text encodings.

MIT© Dmitry Shirokov

fflate0.8.3

ZIP for “Download all”.

MIT© Arjun Barrett

@huggingface/tokenizers, @huggingface/jinja

Apache-2.0

Kokoro inference & text normalisation (ported from kokoro-js 1.2.1)

© hexgrad, Xenova. Vendored into src/engines/ai/worker/kokoro.ts to run on transformers.js v4.

Apache-2.0

ONNX Runtime Web1.31.0-dev.20260914-8d85527a0

WASM/WebGPU inference engine, self-hosted under /engines/ort@…/.

MIT© Microsoft Corporation

phonemizer 1.2.1 (eSpeak NG compiled to WebAssembly)

Text-to-phoneme step of text-to-speech. Bundles eSpeak NG (https://github.com/espeak-ng/espeak-ng), which is GPL-3.0-or-later; it is loaded only by the text-to-speech tools as a separate chunk. Source: the eSpeak NG repository; legal review recommended.

Apache-2.0 (wrapper) / GPL-3.0-or-later (eSpeak NG)

RNNoise (Xiph.Org / Jean-Marc Valin)

BSD-3-Clause

Transformers.js4.3.1

Model runtime (WebGPU / WASM), runs in a Web Worker.

Apache-2.0© Hugging Face, Inc.

all-MiniLM-L6-v2 (sentence-transformers) — Xenova ONNX export

Sentence embeddings for automatic chapters.

Apache-2.0

BiRefNet Lite (Zheng et al.) — onnx-community/BiRefNet_lite-ONNX

High-quality background removal.

MIT

Chrome built-in AI (Translator, LanguageDetector, Summarizer, Prompt API)

Used only when the browser provides it; runs on-device.

Browser feature (Google terms)

Kokoro-82M v1.0 (hexgrad) — onnx-community ONNX export

Text-to-speech model and voice style files.

Apache-2.0

MI-GAN (Picsart AI Research) — migan_pipeline_v2.onnx

Object and watermark removal (code and weights MIT).

MIT

MODNet (Ke et al.) — Xenova/modnet

Fast portrait background removal.

Apache-2.0

OPUS-MT translation models (Helsinki-NLP) — Xenova/opus-mt-* ONNX exports

Attribution: Jörg Tiedemann and Santhosh Thottingal, “OPUS-MT — Building open translation services for the World”, EAMT 2020.

CC-BY-4.0 / Apache-2.0 (per language pair)

Silero VAD v5

Self-hosted at /models/silero-vad/.

MIT

Swin2SR (Conde et al.) — classical ×2 and real-world ×4 (BSRGAN-PSNR)

Image super-resolution.

Apache-2.0

Whisper large-v3-turbo (OpenAI) — onnx-community export

MIT

Whisper tiny / base / small (OpenAI) — onnx-community *_timestamped exports

Speech recognition with word timestamps.

Apache-2.0

YuNet face detector 2023mar (OpenCV Zoo, Shiqi Yu et al.)

Self-hosted at /models/yunet/.

MIT