FormatPlease software licenses and source downloads

FormatPlease uses browser APIs and open-source software. Conversion runs locally on your device; codec assets are downloaded from this website when needed.

Choose the section for the tool you are using: the image converterand image-to-PDF tool use the image/PDF components, the video converter uses the FFmpeg build below, and the audio converter and audio trimmer uses a separate engine. The notices and source downloads describe distributed software; theprivacy notice explains how files are processed.

Third-party components

Exact package versions used by this build, including browser helpers, generated styles and FFmpeg type definitions. Each license link opens the retained original notices.

Image to Text: local OCR

Image to Text uses Tesseract.js and Tesseract.js-core 7.0.0 (Apache-2.0), with Leptonica and its image codecs. English and Traditional Chinese 4.0.0_best_int model weights inherit the upstream Apache-2.0 license; the language package’s MIT metadata describes packaging.

Retained native, model and bundled JavaScript notices · Pinned assets and source references. These source references are an inventory, not an independently reproduced build.

Media Info: local metadata inspection

The Media Info inspector uses mediainfo.js 0.3.8 and MediaInfoLib 26.05 in a separate on-demand browser worker. This product uses MediaInfo library, Copyright (c) 2002–2026 MediaArea.net SARL. The parser does not transcode media.

Review the BSD-2-Clause, ZenLib, zlib and toolchain notices and the pinned binary and source/version inventory. Exact toolchain and zlib port revisions are not attested by the published npm binary; the inventory distinguishes retained notice references from verified component versions.

Video: FFmpeg and ffmpeg.wasm

The MP4 to MP3 and M4A to MP3 tools reuse this same GPL FFmpeg core for audio-only extraction and LAME encoding. They do not ship another binary. The matching sources, configuration and notices below cover that core.

The @ffmpeg/ffmpeg 0.12.15 wrapper and @ffmpeg/types 0.12.4 use MIT. The separate FormatPlease FFmpeg core 0.12.10-formatplease.1 contains FFmpeg 5.1.4, GPL-2.0-or-later. The core is sent to your browser and runs in a Web Worker, so it is distributed software.

This single-thread build enables GPL components, including x264 and FFmpeg’s internal libpostproc. Its configuration includes --enable-gpl and does not include --enable-nonfree. These notices describe the included components and do not declare all FormatPlease code to be GPL.

FFmpeg source release

5.1.4 — 4729204c17f756e186d622060088371d10b34f7e

ffmpeg.wasm core release source

v12.15 — 71aa99d37c02a7b4c435275ca9ef50e612f6efa1

Local modifications

Custom-built from the pinned upstream sources with the x265 build stage and HEVC encoder removed. The upstream bindings and fftools are unchanged. Transport chunks are reassembled byte-for-byte by a separate loader.

FFmpeg build configuration

Complete configure arguments reported by the distributed WASM’s -version output. This records the binary’s configuration; build environment and linker options are in the source package.

--target-os=none \
--arch=x86_32 \
--enable-cross-compile \
--disable-asm \
--disable-stripping \
--disable-programs \
--disable-doc \
--disable-debug \
--disable-runtime-cpudetect \
--disable-autodetect \
--nm=emnm \
--ar=emar \
--ranlib=emranlib \
--cc=emcc \
--cxx=em++ \
--objcc=emcc \
--dep-cc=emcc \
--extra-cflags='-I/dev/shm/formatplease-no-x265/install/core/include -O3 -msimd128' \
--extra-cxxflags='-I/dev/shm/formatplease-no-x265/install/core/include -O3 -msimd128' \
--disable-pthreads \
--disable-w32threads \
--disable-os2threads \
--enable-gpl \
--enable-libx264 \
--enable-libvpx \
--enable-libmp3lame \
--enable-libtheora \
--enable-libvorbis \
--enable-libopus \
--enable-zlib \
--enable-libwebp \
--enable-libfreetype \
--enable-libfribidi \
--enable-libass \
--enable-libzimg

Read the captured version, build configuration and codec capabilities.

Bundled codec libraries

These external libraries are explicitly enabled in the binary’s configuration. License links include their original copyright and patent notices where supplied.

FreeType offers FTL or GPL-2.0-or-later; the GPL option is compatible with this GPL aggregate. Its additional notices are retained.

Corresponding source

Download source archives, build scripts and configuration. The 18 pinned archives include FFmpeg, ffmpeg.wasm bindings and build scripts, external libraries, Emscripten and SDL. Downloads require no account or payment.

This core was built from the pinned source archives using the included custom recipe. Build records, linker evidence, binary capabilities and checksums accompany the downloads. Reproducible output across different host build tools is not promised.

• Build instructions, source provenance and verification limits
• Source commits, archive sizes and SHA-256 checksums
• Core JavaScript and WASM checksums
• GNU GPL version 2 · ffmpeg.wasm MIT license
• FFmpeg and supporting-library notices

Custom build recipe · Build provenance · Linker map

Image and PDF assets

AVIF uses @jsquash/avif 2.1.1 (Apache-2.0 wrapper), libavif 1.0.1, libaom 3.7.0 and libsharpyuv. Their BSD grants and patent notices are included in the retained AVIF notices. HEIC image decoding uses browser-native support; the separate video core retains internal HEVC decoding for video input, with no HEVC output encoder.

PDF.js uses Apache-2.0, with BSD-3-Clause Adobe CMap notices and Foxit font notices. Within PDF.js assets, only the selected PFB fonts and CMaps are distributed; Liberation TTF fonts and PDF.js optional WASM codecs are excluded. The installed PDF.js package has no separate root NOTICE file; its supplied license and asset notices are retained.

PDF Sign: Unicode font

Sign and Fill PDF lazily loads FormatPlease Unicode Regular, derived from Noto Sans TC at the pinned revision recorded in the font manifest. The SIL Open Font License 1.1 (OFL-1.1) permits commercial distribution and PDF embedding subject to its terms. The modified static font is renamed to respect reserved names. Original copyright records, notices and the build recipe accompany distribution.

Unicode embedding uses @pdf-lib/fontkit 1.1.1, whose upstream README and package declare MIT. Upstream supplies no separate root LICENSE file; the original declaration and bundled copyright/license comments are retained in its distributed notices. This does not claim a separate upstream grant file exists.

Codec / patent considerations

Open-source software licenses govern copyright permissions and obligations. They do not guarantee that every use of a codec is free of patent or royalty obligations. Requirements may vary by codec, use case and jurisdiction. No universal patent clearance is claimed.

Full notices and source links

All retained package license texts · Versioned package inventory and upstream source links. Copies of these notices are retained in the project repository and distributed with the website. Third-party components remain governed by their respective open-source licenses.

FFmpeg license information · ffmpeg.wasm license information