# html2pdf.js html2pdf.js converts any webpage or element into a printable PDF entirely client-side using [html2canvas](https://github.com/niklasvh/html2canvas) and [jsPDF](https://github.com/MrRio/jsPDF). ## Table of contents - [Getting started](#getting-started) - [HTML](#html) - [NPM](#npm) - [Bower](#bower) - [Console](#console) - [Usage](#usage) - [Advanced usage](#advanced-usage) - [Workflow](#workflow) - [Worker API](#worker-api) - [Options](#options) - [Page-breaks](#page-breaks) - [Page-break settings](#page-break-settings) - [Page-break modes](#page-break-modes) - [Example usage](#example-usage) - [Image type and quality](#image-type-and-quality) - [Progress tracking](#progress-tracking) - [Dependencies](#dependencies) - [Contributing](#contributing) - [Issues](#issues) - [Tests](#tests) - [Pull requests](#pull-requests) - [Credits](#credits) - [License](#license) ## Getting started #### HTML The simplest way to use html2pdf.js is to download `dist/html2pdf.bundle.min.js` to your project folder and include it in your HTML with: ```html ``` *Note: [Click here](#dependencies) for more information about using the unbundled version `dist/html2canvas.min.js`.* #### NPM Install html2pdf.js and its dependencies using NPM with `npm install --save html2pdf.js` (make sure to include `.js` in the package name). *Note: You can use NPM to create your project, but html2pdf.js **will not run in Node.js**, it must be run in a browser.* #### Bower Install html2pdf.js and its dependencies using Bower with `bower install --save html2pdf.js` (make sure to include `.js` in the package name). #### Console If you're on a webpage that you can't modify directly and wish to use html2pdf.js to capture a screenshot, you can follow these steps: 1. Open your browser's console (instructions for different browsers [here](https://webmasters.stackexchange.com/a/77337/94367)). 2. Paste in this code: ```js function addScript(url) { var script = document.createElement('script'); script.type = 'application/javascript'; script.src = url; document.head.appendChild(script); } addScript('https://raw.githack.com/eKoopmans/html2pdf/master/dist/html2pdf.bundle.js'); ``` 3. You may now execute html2pdf.js commands directly from the console. To capture a default PDF of the entire page, use `html2pdf(document.body)`. ## Usage Once installed, html2pdf.js is ready to use. The following command will generate a PDF of `#element-to-print` and prompt the user to save the result: ```js var element = document.getElementById('element-to-print'); html2pdf(element); ``` ### Advanced usage Every step of html2pdf.js is configurable, using its new Promise-based API. If html2pdf.js is called without arguments, it will return a `Worker` object: ```js var worker = html2pdf(); // Or: var worker = new html2pdf.Worker; ``` This worker has methods that can be chained sequentially, as each Promise resolves, and allows insertion of your own intermediate functions between steps. A prerequisite system allows you to skip over mandatory steps (like canvas creation) without any trouble: ```js // This will implicitly create the canvas and PDF objects before saving. var worker = html2pdf().from(element).save(); ``` #### Workflow The basic workflow of html2pdf.js tasks (enforced by the prereq system) is: ``` .from() -> .toContainer() -> .toCanvas() -> .toImg() -> .toPdf() -> .save() ``` #### Worker API | Method | Arguments | Description | |--------------|--------------------|-------------| | from | src, type | Sets the source (HTML string or element) for the PDF. Optional `type` specifies other sources: `'string'`, `'element'`, `'canvas'`, or `'img'`. | | to | target | Converts the source to the specified target (`'container'`, `'canvas'`, `'img'`, or `'pdf'`). Each target also has its own `toX` method that can be called directly: `toContainer()`, `toCanvas()`, `toImg()`, and `toPdf()`. | | output | type, options, src | Routes to the appropriate `outputPdf` or `outputImg` method based on specified `src` (`'pdf'` (default) or `'img'`). | | outputPdf | type, options | Sends `type` and `options` to the jsPDF object's `output` method, and returns the result as a Promise (use `.then` to access). See the [jsPDF source code](https://rawgit.com/MrRio/jsPDF/master/docs/jspdf.js.html#line992) for more info. | | outputImg | type, options | Returns the specified data type for the image as a Promise (use `.then` to access). Supported types: `'img'`, `'datauristring'`/`'dataurlstring'`, and `'datauri'`/`'dataurl'`. | | save | filename | Saves the PDF object with the optional filename (creates user download prompt). | | set | opt | Sets the specified properties. See [Options](#options) below for more details. | | get | key, cbk | Returns the property specified in `key`, either as a Promise (use `.then` to access), or by calling `cbk` if provided. | | then | onFulfilled, onRejected | Standard Promise method, with `this` re-bound to the Worker, and with added progress-tracking (see [Progress](#progress) below). Note that `.then` returns a `Worker`, which is a subclass of Promise. | | thenCore | onFulFilled, onRejected | Standard Promise method, with `this` re-bound to the Worker (no progress-tracking). Note that `.thenCore` returns a `Worker`, which is a subclass of Promise. | | thenExternal | onFulfilled, onRejected | True Promise method. Using this 'exits' the Worker chain - you will not be able to continue chaining Worker methods after `.thenExternal`. | | catch, catchExternal | onRejected | Standard Promise method. `catchExternal` exits the Worker chain - you will not be able to continue chaining Worker methods after `.catchExternal`. | | error | msg | Throws an error in the Worker's Promise chain. | A few aliases are also provided for convenience: | Method | Alias | |-----------|-----------| | save | saveAs | | set | using | | output | export | | then | run | ## Options html2pdf.js can be configured using an optional `opt` parameter: ```js var element = document.getElementById('element-to-print'); var opt = { margin: 1, filename: 'myfile.pdf', image: { type: 'jpeg', quality: 0.98 }, html2canvas: { scale: 2 }, jsPDF: { unit: 'in', format: 'letter', orientation: 'portrait' } }; // New Promise-based usage: html2pdf().set(opt).from(element).save(); // Old monolithic-style usage: html2pdf(element, opt); ``` The `opt` parameter has the following optional fields: |Name |Type |Default |Description | |------------|----------------|--------------------------------|------------------------------------------------------------------------------------------------------------| |margin |number or array |`0` |PDF margin (in jsPDF units). Can be a single number, `[vMargin, hMargin]`, or `[top, left, bottom, right]`. | |filename |string |`'file.pdf'` |The default filename of the exported PDF. | |pagebreak |object |`{mode: ['css', 'legacy']}` |Controls the pagebreak behaviour on the page. See [Page-breaks](#page-breaks) below. | |image |object |`{type: 'jpeg', quality: 0.95}` |The image type and quality used to generate the PDF. See [Image type and quality](#image-type-and-quality) below.| |enableLinks |boolean |`true` |If enabled, PDF hyperlinks are automatically added ontop of all anchor tags. | |html2canvas |object |`{ }` |Configuration options sent directly to `html2canvas` ([see here](https://html2canvas.hertzen.com/configuration) for usage).| |jsPDF |object |`{ }` |Configuration options sent directly to `jsPDF` ([see here](http://rawgit.com/MrRio/jsPDF/master/docs/jsPDF.html) for usage).| ### Page-breaks html2pdf.js has the ability to automatically add page-breaks to clean up your document. Page-breaks can be added by CSS styles, set on individual elements using selectors, or avoided from breaking inside all elements (`avoid-all` mode). By default, html2pdf.js will respect most CSS [`break-before`](https://developer.mozilla.org/en-US/docs/Web/CSS/break-before), [`break-after`](https://developer.mozilla.org/en-US/docs/Web/CSS/break-after), and [`break-inside`](https://developer.mozilla.org/en-US/docs/Web/CSS/break-inside) rules, and also add page-breaks after any element with class `html2pdf__page-break` (for legacy purposes). #### Page-break settings |Setting |Type |Default |Description | |----------|----------------|--------------------|------------| |mode |string or array |`['css', 'legacy']` |The mode(s) on which to automatically add page-breaks. One or more of `'avoid-all'`, `'css'`, and `'legacy'`. | |before |string or array |`[]` |CSS selectors for which to add page-breaks before each element. Can be a specific element with an ID (`'#myID'`), all elements of a type (e.g. `'img'`), all of a class (`'.myClass'`), or even `'*'` to match every element. | |after |string or array |`[]` |Like 'before', but adds a page-break immediately after the element. | |avoid |string or array |`[]` |Like 'before', but avoids page-breaks on these elements. You can enable this feature on every element using the 'avoid-all' mode. | #### Page-break modes | Mode | Description | |-----------|-------------| | avoid-all | Automatically adds page-breaks to avoid splitting any elements across pages. | | css | Adds page-breaks according to the CSS `break-before`, `break-after`, and `break-inside` properties. Only recognizes `always/left/right` for before/after, and `avoid` for inside. | | legacy | Adds page-breaks after elements with class `html2pdf__page-break`. This feature may be removed in the future. | #### Example usage ```js // Avoid page-breaks on all elements, and add one before #page2el. html2pdf().set({ pagebreak: { mode: 'avoid-all', before: '#page2el' } }); // Enable all 'modes', with no explicit elements. html2pdf().set({ pagebreak: { mode: ['avoid-all', 'css', 'legacy'] } }); // No modes, only explicit elements. html2pdf().set({ pagebreak: { before: '.beforeClass', after: ['#after1', '#after2'], avoid: 'img' } }); ``` ### Image type and quality You may customize the image type and quality exported from the canvas by setting the `image` option. This must be an object with the following fields: |Name |Type |Default |Description | |------------|----------------|------------------------------|---------------------------------------------------------------------------------------------| |type |string |'jpeg' |The image type. HTMLCanvasElement only supports 'png', 'jpeg', and 'webp' (on Chrome). | |quality |number |0.95 |The image quality, from 0 to 1. This setting is only used for jpeg/webp (not png). | These options are limited to the available settings for [HTMLCanvasElement.toDataURL()](https://developer.mozilla.org/en-US/docs/Web/API/HTMLCanvasElement/toDataURL), which ignores quality settings for 'png' images. To enable png image compression, try using the [canvas-png-compression shim](https://github.com/ShyykoSerhiy/canvas-png-compression), which should be an in-place solution to enable png compression via the `quality` option. ## Progress tracking The Worker object returned by `html2pdf()` has a built-in progress-tracking mechanism. It will be updated to allow a progress callback that will be called with each update, however it is currently a work-in-progress. ## Dependencies html2pdf.js depends on the external packages [html2canvas](https://github.com/niklasvh/html2canvas), [jsPDF](https://github.com/MrRio/jsPDF), and [es6-promise](https://github.com/stefanpenner/es6-promise). These dependencies are automatically loaded when using NPM or the bundled package. If using the unbundled `dist/html2pdf.min.js` (or its un-minified version), you must also include each dependency. Order is important, otherwise html2canvas will be overridden by jsPDF's own internal implementation: ```html ``` ## Contributing ### Issues When submitting an issue, please provide reproducible code that highlights the issue, preferably by creating a fork of [this template jsFiddle](https://jsfiddle.net/u6o6ne41/) (which has html2pdf.js already loaded). Remember that html2pdf.js uses [html2canvas](https://github.com/niklasvh/html2canvas) and [jsPDF](https://github.com/MrRio/jsPDF) as dependencies, so it's a good idea to check each of those repositories' issue trackers to see if your problem has already been addressed. #### Known issues 1. **Rendering:** The rendering engine html2canvas isn't perfect (though it's pretty good!). If html2canvas isn't rendering your content correctly, I can't fix it. - You can test this with something like [this fiddle](https://jsfiddle.net/eKoopmans/z1rupL4c/), to see if there's a problem in the canvas creation itself. 2. **Node cloning (CSS etc):** The way html2pdf.js clones your content before sending to html2canvas is buggy. A fix is currently being developed - try out: - direct file: Go to [html2pdf.js/bugfix/clone-nodes-BUILD](/eKoopmans/html2pdf.js/tree/bugfix/clone-nodes-BUILD) and replace the files in your project with the relevant files (e.g. `dist/html2pdf.bundle.js`) - npm: `npm install eKoopmans/html2pdf.js#bugfix/clone-nodes-BUILD` - Related project: [Bugfix: Cloned nodes](https://github.com/eKoopmans/html2pdf.js/projects/9) 3. **Resizing:** Currently, html2pdf.js resizes the root element to fit onto a PDF page (causing internal content to "reflow"). - This is often desired behaviour, but not always. - There are plans to add alternate behaviour (e.g. "shrink-to-page"), but nothing that's ready to test yet. - Related project: [Feature: Single-page PDFs](https://github.com/eKoopmans/html2pdf.js/projects/1) 4. **Rendered as image:** html2pdf.js renders all content into an image, then places that image into a PDF. - This means text is *not selectable or searchable*, and causes large file sizes. - This is currently unavoidable, however recent improvements in jsPDF mean that it may soon be possible to render straight into vector graphics. - Related project: [Feature: New renderer](https://github.com/eKoopmans/html2pdf.js/projects/4) 5. **Promise clashes:** html2pdf.js relies on specific Promise behaviour, and can fail when used with custom Promise libraries. - In the next release, Promises will be sandboxed in html2pdf.js to remove this issue. - Related project: [Bugfix: Sandboxed promises](https://github.com/eKoopmans/html2pdf.js/projects/11) 6. **Maximum size:** HTML5 canvases have a [maximum height/width](https://stackoverflow.com/a/11585939/4080966). Anything larger will fail to render. - This is a limitation of HTML5 itself, and results in large PDFs rendering completely blank in html2pdf.js. - The jsPDF canvas renderer (mentioned in Known Issue #4) may be able to fix this issue! - Related project: [Bugfix: Maximum canvas size](https://github.com/eKoopmans/html2pdf.js/projects/5) ### Tests html2pdf.js is currently sorely lacking in unit tests. Any contributions or suggestions of automated (or manual) tests are welcome. This is high on the to-do list for this project. ### Pull requests If you want to create a new feature or bugfix, please feel free to fork and submit a pull request! Create a fork, branch off of `master`, and make changes to the `/src/` files (rather than directly to `/dist/`). You can test your changes by rebuilding with `npm run build`. ## Credits [Erik Koopmans](https://github.com/eKoopmans) #### Contributors - [@WilcoBreedt](https://github.com/WilcoBreedt) - [@Ranger1230](https://github.com/Ranger1230) #### Special thanks - [Sauce Labs](https://saucelabs.com/) for unit testing. ## License [The MIT License](http://opensource.org/licenses/MIT) Copyright (c) 2017-2019 Erik Koopmans <[http://www.erik-koopmans.com/](http://www.erik-koopmans.com/)>

	Stars	Issues	Version	Updated	Created
dom-to-image	10,104	321	2.6.0	7 years ago	8 years ago
html2canvas	29,839	979	1.4.1	2 years ago	9 years ago
html2pdf.js	3,834	476	0.10.1	3 years ago	6 years ago
html2png	28	2	1.1.2	9 years ago	9 years ago

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