Licenses and third-party credits
All the third-party software the site uses, with its real license and link. There are no GPL or AGPL components.
Last updated: October 1, 2026
Herramientas Web is built with free software and public data. This page gathers everything the site actually uses: libraries that run in your browser, artificial intelligence models, typefaces, and data sources. Licenses were verified against the license file or the listing of each package, model, or dataset; they are not estimates.
Components under the LGPL license (libheif and the audio encoders) and MPL-2.0(Mediabunny and the build tools) are loaded as separate modules, on demand, and are distributed with their license. If you spot an error in this list, write to us at [email protected].
Code libraries
They run on your device. The heaviest ones are downloaded only when you use the tool that needs them.
| Component | Used for | License | Link |
|---|---|---|---|
| pdf.js (pdfjs-dist) | Display and render PDF pages | Apache-2.0 | Link |
| pdf-lib | Create and edit PDF files | MIT | Link |
| @pdf-lib/fontkit | Embed fonts in PDFs with pdf-lib | MIT | Link |
| qpdf (compiled to WebAssembly) | Encrypt and decrypt PDFs | ISC (package) and Apache-2.0 (QPDF) | Link |
| Tesseract.js and language data (English, Spanish) | Text recognition (OCR) | Apache-2.0 | Link |
| jSquash (jpeg, webp, avif, oxipng) | Encode JPEG, WebP, and AVIF images, and optimize PNGs | Apache-2.0 | Link |
| libheif-js | Read HEIC/HEIF images | LGPL-3.0 | Link |
| heic2any | Convert HEIC/HEIF images (includes libheif) | MIT (includes libheif: LGPL-3.0) | Link |
| UTIF.js | Read TIFF images | MIT | Link |
| exifr | Read EXIF metadata from photos | MIT | Link |
| gifenc | Write GIF files | MIT | Link |
| ONNX Runtime Web | Run the AI models in the browser | MIT | Link |
| Mediabunny | Read and write audio and video with WebCodecs | MPL-2.0 | Link |
| @mediabunny/mp3-encoder | Encode MP3 (includes LAME) | MPL-2.0 (LAME: LGPL-2.1) | Link |
| @mediabunny/aac-encoder | Encode AAC (includes the FFmpeg encoder) | MPL-2.0 (FFmpeg: LGPL-2.1) | Link |
| @mediabunny/flac-encoder | Encode FLAC (includes libFLAC) | MPL-2.0 (libFLAC: BSD-3-Clause) | Link |
| docx-preview | Display .docx files with Word’s page layout | Apache-2.0 | Link |
| docx | Generate .docx files | MIT | Link |
| html2canvas | Capture HTML content as an image | MIT | Link |
| JSZip | Read .docx files | MIT (dual license, MIT or GPL-3.0; used under MIT) | Link |
| SheetJS (xlsx) | Read Excel spreadsheets (.xlsx, .xls, .ods) | Apache-2.0 | Link |
| marked | Convert Markdown to HTML | MIT | Link |
| DOMPurify | Sanitize the generated HTML | MPL-2.0 or Apache-2.0 | Link |
| highlight.js | Highlight code in the Markdown editor | BSD-3-Clause | Link |
| jsonrepair | Repair malformed JSON | ISC | Link |
| jsdiff (diff) | Compare texts | BSD-3-Clause | Link |
| decimal.js | Decimal-precision calculations | MIT | Link |
| hash-wasm | Compute hashes, bcrypt, and Argon2id | MIT | Link |
| pcre2-wasm | PCRE2 regular expressions | MIT (PCRE2: BSD-3-Clause with a WebAssembly exception) | Link |
| qrcode-generator | Generate QR codes | MIT | Link |
| jsQR | Read QR codes | Apache-2.0 | Link |
| JsBarcode | Generate barcodes | MIT | Link |
| fflate | Create and read ZIP files | MIT | Link |
| zip.js | Open ZIPs and create password-protected ZIPs | BSD-3-Clause | Link |
| Lucide | Interface icons | ISC | Link |
| SVGO | Optimize SVG files | MIT | Link |
| csso | Minify CSS | MIT | Link |
| html-minifier-terser | Minify HTML | MIT | Link |
| Terser | Minify JavaScript | BSD-2-Clause | Link |
| pdf.js resources (standard fonts and decoders) | PDFs with non-embedded fonts and compressed images | Liberation (OFL-1.1), Foxit, JBIG2, OpenJPEG (BSD-2-Clause), qcms | Link |
Artificial intelligence models
They run in your browser with ONNX Runtime Web or Transformers.js. The files are downloaded only once and stay in your browser's cache; the content you process is not sent to any server.
| Model | Used for | License | Link |
|---|---|---|---|
| U²-Net-P (u2netp) | Remove image backgrounds (fast mode) | Apache-2.0 | Link |
| IS-Net / DIS | Remove image backgrounds (precise mode) | Apache-2.0 (model) and MIT (ONNX packaging) | Link |
| Whisper tiny and base (Xenova ONNX) | Transcribe audio to text | Apache-2.0 | Link |
| Transformers.js (@huggingface/transformers) | Run Whisper in the browser | Apache-2.0 | Link |
| Piper voices (rhasspy/piper-voices) | Generate downloadable audio in Text to speech | CC0 / Unlicense (public domain) | Link |
| CMUdict (English pronunciation dictionary) | English pronunciation for the downloadable audio in Text to speech | BSD 2-Clause. Copyright (C) 1993-2015 Carnegie Mellon University | Link |
Typefaces
All of them are served from the site itself (they are not requested from Google Fonts) and use the SIL Open Font License 1.1 for free fonts.
| Font | Used for | License | Link |
|---|---|---|---|
| Geist and Geist Mono | The site’s interface typeface | OFL-1.1 | Link |
| Inter | Typeface used in several tools | OFL-1.1 | Link |
| Noto Sans and Noto Serif | Document text and printing | OFL-1.1 | Link |
| Decorative fonts (Anton, Archivo Black, Bangers, Bebas Neue, Caveat, Dancing Script, Great Vibes, Homemade Apple, Luckiest Guy, Merriweather, Montserrat, Oswald, Pacifico, Permanent Marker, Playfair Display, Poppins, Roboto, Roboto Mono, and Sacramento) | Fancy lettering, memes, signatures, and text over images | OFL-1.1 | Link |
Data and content
Public data from official bodies and the site's own lists. The date of each dataset and how to update it are documented in the project repository.
| Data | Used for | Source and license | Link |
|---|---|---|---|
| Argentine public holidays | Holiday and business-day calendar | Law 27,399 and decrees; cross-checked against ArgentinaDatos | Source |
| Public holidays of other countries | International business-day calculator | ArgentinaDatos and Nager.Date | Source |
| CPI, UVA, and ICL | Inflation, fixed-term deposits, and rent adjustments | INDEC and BCRA (via ArgentinaDatos) | Source |
| Dollar exchange rates | Dollar today and card dollar | DolarApi, Bluelytics, ArgentinaDatos, and CriptoYa | Source |
| Monotributo | Monotributo categories and contributions | ARCA (formerly AFIP) | Source |
| Income tax, contributions, and caps | Net salary and aguinaldo | ARCA and ANSES | Source |
| Card dollar | Income tax withholding on foreign-currency purchases | ARCA General Resolution 5617/2024 | Source |
| VAT | VAT calculator and rates | Law 23,349, art. 28 | Source |
| Peseta conversion rate | Pesetas to euros (Spanish version of the site) | Council Regulation (EC) No 2866/98, published in Spain’s official gazette (BOE) | Source |
| Spanish VAT | Spanish VAT calculator (Spanish version of the site) | Law 37/1992 on Value Added Tax (BOE) | Source |
| Spanish minimum wage | Minimum wage in Spain (Spanish version of the site) | Royal Decrees 126/2026 and 87/2025 (BOE) | Source |
| Spanish working holidays | Working calendar of Spain (Spanish version of the site) | Resolution of 17 October 2025 of the Directorate-General of Labour (BOE-A-2025-21667) | Source |
| DNI and NIE check letter | DNI check letter (Spanish version of the site) | Spanish Ministry of the Interior, check-digit calculation for the NIF/NIE | Source |
| Bank account check digits | IBAN calculator (Spanish version of the site) | The calculation Spanish banks use. CaixaBank describes the mod-11 method and the 10 → 1 / 11 → 0 rule, not the weights: those were checked against example accounts and not against a standard | Source |
| Social media sizes | Social media image | Each network’s official help | Source |
| Game word lists | Hangman, word search, and word of the day | The site’s own lists | — |
| ENABLE (English word list) | Word guessing game, English version: accepted guesses | Public domain | Source |
| SCOWL / English Speller Database (ESDB) | Word guessing game, English version: common words used as answers | Copyright 2000-2026 by Kevin Atkinson. Permission to use, copy, modify, distribute, and sell any part of the English Speller Database (ESDB, previously known as SCOWLv2), or word lists created from it, is hereby granted without fee, provided that the above copyright notice appears in all copies and that both the above copyright notice and this notice appear in supporting documentation. Kevin Atkinson makes no representations about the suitability of this database for any purpose. It is provided “as is” without express or implied warranty. | Source |
| List of Dirty, Naughty, Obscene, and Otherwise Bad Words (LDNOOBW) | English versions of the word guessing game, the typing test and the password generator: used only to keep offensive words out | CC BY 4.0 (Creative Commons Attribution 4.0). Credit: the LDNOOBW contributors. Used for filtering; the list itself is not distributed | Source |
| 2,048-word dictionary | Passphrase generator | The site’s own list | — |
| Typing test texts and words | Typing speed test | The site’s own list and public-domain works | — |
| Frequent English words (Leipzig Corpora Collection) | Typing speed test and password checker in English | Universität Leipzig, CC BY; filtered by the site | Source |
| EFF Large Wordlist (7,776 English words) | Passphrase generator in English | Electronic Frontier Foundation, CC BY | Source |
| Most common English passwords (SecLists) | Password checker in English | MIT | Source |
| Spanish stop words | Word counter | The site’s own list | — |
| Symbol and kaomoji catalog | Symbols to copy | The site’s own catalog | — |
| Emojis | Symbols to copy | Emojibase (MIT) and Unicode CLDR names (Unicode License) | Source |
| English names and keywords for symbols and emojis | Symbols to copy (English version) | Unicode CLDR and Unicode Character Database, © Unicode, Inc. (Unicode License v3) | Source |
| Cities and time zones | World clock | The site’s own list; time zone rules from the browser (Intl) | — |
Build tools
They are used to generate the site and are not part of the code your browser downloads.
External services
Tools that look up public data over the internet. Your browser requests that data directly from the provider; we do not send the content you process, but the provider can see your IP address, as in any web visit. You can read more in the privacy policy.
| Service | Used for | Type | Link |
|---|---|---|---|
| DolarApi, Bluelytics, ArgentinaDatos, and CriptoYa | Dollar exchange rates and index series | Public APIs | Site |
| api.bcra.gob.ar | Rental Contracts Index (ICL) | Public API | Site |
| Nager.Date | Public holidays of other countries | Public API | Site |
| jsDelivr | AI engine and WebAssembly files that do not fit on the site | Public CDN | Site |
| Hugging Face | AI models and voices that are downloaded only once | Public repository | Site |
| Cloudflare | Site hosting and cookie-free analytics | Infrastructure provider | Site |
No strong copyleft licenses
No component of the site is distributed under the GPL or AGPL. The only licenses with obligations to share improvements are the LGPL (libheif and the audio encoders, loaded as separate modules) and MPL-2.0 (Mediabunny and the build tools): in both cases the code is used unmodified and distributed with its license.
See also the privacy policy and the terms of use.