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JavaScript painting plugin which allows editing images in a browser. Can be easily integrated into any website or webapp by calling simple initialization code.

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🙏🙏🙏 Scream for help to Ukraine

24 February 2022, Russia started bombing cities with peacefully civilized population in whole Ukraine. And has been doing it up to this day. Breaking all laws of war. Their bombs has been killing children and adults. This deserves Hague court.

• 🏠 If you are from Russia, please stop your government by any means including protests, don't trust local media, they are bribed by the government. They always was. I am sure you already feel lie by unexplainable crazy things in your country caused by world sanctions.
• 💣 Please spread the information about bombing of Ukraine in all social way you could. Russia treacherously broke into the territory of a sovereign state. Do not trust to anything from Russian media, most likely it will be bullshit
• 💼 If you have any kind of business cooperation with Russia, please block it now and keep most of money on your side, this is the only possible ethical decision
• ☢️ Ask your government to stop Russia from spreading invasion in any way. Russia is nuclear threat to the whole world. You think it is not possible? We thought that bombing of independent country with population of 44.13 million is also not possible.

Features

• Paste image from clipboard with Ctrl+V (e.g. PtnScr screenshot), drag and drop it into widget, or load with file select dialog
• Crop image by defined area
• Paint primitives: line, rectangle, ellipse (alpha color can be used)
• Brush – free drawing tool e.g. to implement finger-based signatures on tablet screens
• Add text (you can use Ctrl+B - bold, Ctrl+I - italic, Ctrl+U - underlined, or just pase formatted HTML)
• Rotate / resize, scale image
• Pixelize some area to hide sensitive data
• Draw arrows
• Trash can tool to clear the canvas
• Paint bucket tool for color fills
• Add filters to images

Used by

NASA Open MCT

Cisco DevNet

Tracklify

FastDivs

Advantages 💪

• It is lightweight and minimalistic - written with vanilla JS, you don't need dependencies to use it
• Designed to process images with minimal clicks, most actions support hot-keys
• Could be easily integrated into SPA application (React, Vue, Angular)
• Could be used in Electron and Cordova apps
• Flexibale image saving - you provide your save handler, and get base64 data with any jpeg/png compression
• Could be translated to any language

Originally Painterro was designed for quick screenshots processing: You make screenshot by pressing PrtSc button, then open Painterro on your website, paste an image with Ctrl+V, crop it to interested area, highlight something with line/rectangle tool and/or add some text to the image and save on server with custom save handler (e.g. simple XHR request to your backend). In addition, you can use Painterro as image editor for any kind of raster images. Please try a demo. Also painterro has Wordpress Plugin.

If you want to see some feature in Painterro, please leave (or vote for) an issue here. There is no promise that it will be implemented soon or ever, but it is interesting to know what features users want to have.

Usefull hints and tweaks 😋:

• Painterro JS paint features review on HINTY
• Dark theme for Painterro JS paint
• Round buttons for Painterro JS paint

Table of contents

• Table of contents
• Installation
  • With npm
  • By including script
  • Read after installation
• Supported hotkeys
• Configuration
  • Events
  • UI color scheme
  • API
  • Translation
• Saving image
  • Base64 saving
  • Binary saving
  • Saving to WYSIWYG
  • Format and quality
  • Example: Open Painterro by Ctrl+V
• Development
  • Building painterro
  • Dev-server
  • Regenerating icons font

Installation

With npm

If you have npm-based project (e.g. SPA like React/Vue) you can run:

npm install painterro --save

Then in your code

import Painterro from 'painterro'
...
Painterro().show()

By including script

You can download latest painterro-*.min.js here https://github.com/devforth/painterro/releases/ or build it by yourself.

Then insert <script> e.g to <head> section of your HTML file:

<script src="/xxx/painterro-x.x.x.min.js"></script>

Then in your code (body section, onclick handler, etc):

<script>
  Painterro().show()
</script>

See jsfiddle.net example

Read after installation

To be able to save edited images on server or client see Saving image. For configurations see Configuration

Supported hotkeys ⌨

Ctrl + Z	Cancel last operation
Ctrl + V	Paste image from clipboard
Ctrl + C	Copy selected aria to clipboard
Shift when drawing rect/ellipse	Draw square/circle
Shift when drawing line	draw at angles of 0, 45, 90, 135 etc degrees
Alt when using pipette	Hide zoom helper (colored grid)
Ctrl + Wheel mouse up/down	Zoom image
Ctrl + S	Save image

Also some tools have own one-button hotkeys e.g. C - crop, you could see this shortcuts if you will hold mouse on toolbutton.

Configuration ⚙

You can pass parameters map to Painterro constructor:

Painterro({
  activeColor: '#00ff00', // default brush color is green
  // ... other params here
})

Param	Description	Default
id	If provided, then Painterro will be placed to some holder on page with this id, in other case holder-element will be created (fullscreen with margins). Important note: If you are using your block and id option, please add position:relative or absolute or fixed on your container, default (static) will lead to positioning issues	undefined
activeColor	Line/Text color that selected by default	'#ff0000'
activeColorAlpha	Transparancy of activeColor from 0.0 to 1.0, 0.0 = transparent	1
activeFillColor	Fill color that selected by default	'#000000'
activeFillColorAlpha	Transparancy of activeColor from 0.0 to 1.0	0
defaultLineWidth	Line width in px that selected by default	5
defaultPrimitiveShadowOn	Enable Shadow for primitive tools (easier recognize them on a screenshots)	true
defaultEraserWidth	Eraser width in px that selected by default	5
backgroundFillColor	Default background color when image created/erased	'#ffffff'
backgroundFillColorAlpha	Transparancy of backgroundFillColor from 0.0 to 1.0	1.0
textStrokeColor	Stroke color of text tool	'#ffffff'
textStrokeColorAlpha	Stroke color of text tool	1.0
shadowScale	Change text shadow blur for text and arrow	1.0
defaultFontSize	Default font size in pixels	24
backplateImgUrl	background for drawing, doesn't include in final image	undefined
defaultTextStrokeAndShadow	Enables Stroke and Shadow for text tool by default (easier recognize text on screenshots)	true
defaultSize	default image size, should be string in format <width>x<height> in pixel, e.g. '200x100'. If value is 'fill'(default) than all container size will be used	'fill'
defaultTool	Tool selected by default	'select'
hiddenTools	List of tools that you wish to exclude from toolbar. Subset from this list ['crop', 'line', 'arrow', 'rect', 'ellipse', 'brush', 'text', 'rotate', 'resize', 'save', 'open', 'close', 'undo', 'redo', 'zoomin', 'zoomout', 'bucket'], You can't hide default tool	['redo']
initText	Display some centered text before painting (supports HTML). If null, no text will be shown	null
initTextColor	Color of init text	'#808080'
initTextStyle	Style of init text	"26px 'Open Sans', sans-serif"
pixelizePixelSize	Default pixel size of pixelize tool. Can accept values - x - x pixels, x% - means percents of minimal area rectangle side	20%
pixelizeHideUserInput	Don't allow users to enter pixel size In settings tools (and save in localstorage), this would allow developer to freeze pixel size by using params pixelizePixelSize to make sure users will not set low pixel sizes	false
availableLineWidths	A list of the line width values that are available for selection in a drop down list e.g. [1,2,4,8,16,64]. Otherwise an input field is used.	undefined
availableArrowLengths	A list of the arrow sizes values that are available for selection in a drop down list e.g. [10,20,30,40,50,60]. Otherwise an input field is used.	undefined
defaultArrowLength	default arrow length	15
availableEraserWidths	A list of the eraser width values that are available for selection in a drop down list e.g. [1,2,4,8,16,64]. Otherwise an input field is used.	undefined
availableFontSizes	A list of the font size values that are available for selection in a drop down list e.g. [1,2,4,8,16,64]. Otherwise an input field is used.	undefined
toolbarPosition	Whether to position the toolbar at the top or bottom.	'bottom'
fixMobilePageReloader	By default painterro adds overflow-y: hidden to page body on mobile devices to prevent "super smart" feature lice Chrom's reload page. Unfortunately we can't prevent it by preventDefault. If your want to scroll page when painterro is open, set this to false	true
language	Language of the widget.	'en'
how_to_paste_actions	List of paste options that will be suggested on paste using some paste dialog e.g. ['extend_right', 'extend_down'] . If there is only one option in list, then it will chosen automatically without dialog	['replace_all', 'paste_over', 'extend_right', 'extend_down']
replaceAllOnEmptyBackground	Whether to select replace_all without dialog on first paste after painterro was just opened. So it will replaces background with image (will change dimensions to pasted image when background is empty)	true
hideByEsc	If true then ESC press will hide widget	false
saveByEnter	If true then ENTER press will do same as Ctrl+S	false
extraFonts	By default Text tool supports only several predefined fonts due to compatibility considirations , but yousing this option you can add any fonts you want if you are sure they are available on your page/app	['Roboto']
toolbarHeightPx	Height of toolbar in pixels	40
buttonSizePx	Button for toolbar in pixels	32
bucketSensivity	Bucket tool sensivity	100
customTools	List of the custom tools which will appear at the left menu after default options. Custom tool includes three options :	{name:string, callBack:function, iconUrl:dataURL string or URL}
disableWheelZoom	Disables the mousewheel zoom with ctrl	false

Events

Param	Description	Accepted Arguments
onBeforeClose	Function that will be called when user closes painterro it, call doClose to confirm close	hasUnsavedChaged: bool, doCloseCallback: function
onClose	If passed will be triggered when painterro closed by X button (use onHide for all close reasons)	undefined
onHide	If passed will be triggered when painterro hides (by X button or save or any other way)	undefined
onChange	Function that will be called if something will be changed (painted, erased, resized, etc)	<exportable image>
onUndo	Function that will be called if user will undo (Ctrl+Z)	{<current history state>}
onRedo	Function that will be called if user will redo (Ctrl+Z)	{<current history state>}
onImageFailedOpen	Function that will be called if image can`t open	undefined
onImageLoaded	Function that will be called if you passed image to show and when it was loaded	undefined
saveHandler	Function that will be called when user presses Save (or Ctrl+S), Call doneCallback to reflect in painterro that image was saved	{<exportable image>}, doneCallback : function

Events accepted arguments:

• {<exportable image>} is object:

{ 
  image: {
   asBlob: ƒ asBlob(type, quality) // returns blob
   asDataURL: ƒ asDataURL(type, quality) // returns e.g. "data:image/jpeg;base64,/9j/4AAQS...."
   suggestedFileName: ƒ suggestedFileName(type) // returns string
   hasAlphaChannel(): ƒ suggestedFileName() // returns true or false
   getOriginalMimeType: ƒ getOriginalMimeType() // e.g. image/jpeg;
   getWidth: ƒ getWidth() // integer
   getHeight: ƒ getHeight() // integer
  }
  operationsDone: int // integer
} 

• {<current history state>} is object:

{
  prev: {<current history state>} or undefined
  next: {<current history state>} or undefined
  prevCount: int
  sizeh: int
  sizew: int
}

UI color scheme

Next group of params used to configure painterro user interface in simple "JS way". They should be placed under colorScheme group, for example:

Painterro({
  colorScheme: {
    main: '#fdf6b8', // make panels light-yellow
    control: '#FECF67' // change controls color
  }
}).show()

Param	Description	Default
main	Color of panels, take most of UI space	'#fff'
control	Color of controls background (e.g. button background)	'#fff'
controlShadow	Color controls box shadow	'0px 0px 3px 1px #bbb'
controlContent	Content of controls (e.g. button text)	'#000000'
activeControl	Color for control when it active (e.g. button pressed)	'#7485B1'
activeControlContent	Color for activated control content	main
inputBorderColor	You can add border to inputs, by default color is same as main so borders will not be seen	main
inputBackground	Background of inputs	'#ffffff'
inputShadow	shadow of input	'inset 0 0 4px 1px #ccc'
inputText	Color of text in input	activeControl
backgroundColor	Background color of component area which left outside of image due to it size/ratio	'#999999'
dragOverBarColor	Color of bar when dropping file to painterro	'#899dff'
hoverControl	Controls color when mouse hovered	control
hoverControlContent	Controls background color when mouse hovered	'#1a3d67'
toolControlNameColor	Color of toolbar labels that prepend controls	rgba(255,255,255,0.7)

NOTE: all these params are defined only for simplicity, you are free to redefine them in your cascade style files (we don't use importants and so on, so all props should be easily editable). This mettod is recommended for experts - because you can use your CSS preprocessor variables and adopt Painterro for your design. Example usecase is different color of shadows for a buttons with ::after/::before

API

.show([optional]openImage, [optional]initialMimeType) - Shows painterro instance. openImage can have next values:

• false - will open image that already was drawn before last close
• some string value, e.g. 'http://placehold.it/120x120&text=image1' - will try to load image from url
• all another values - will clear content before open

initialMimeType could be used to help painterro understand which file do you try to load there. Could be useful if you want to save the original mime and file opened explicitly (painterro open tool or dnd/ctrl+v handlers get it automatically)

.hide() - hide instance

.setColor(options) - sets the color of the chosen tool , or changes initial value of color. options should be array with two values, [target,colorWidgetState]

available values for target:

|line|, |bg|

colorWidgetState - object with requred properties :

• palleteColor - color string . Just indicates which color will be shown on the collor pallete.
• alpha - number in range from 0 to 1. The same but for alpha channel.
• alphaColor - color string. Color with alpha, which will be using for drawing element.

NOTE: paleteColor and alpha is using only for displaing right values in color picker widget, this two options don't effect on color which will be used for drawing elements.

.setLineWidth() - set line width for chosen tool.

.setArrowLength() - set width for chosen arrow.

.setEraserWidth() - set width of eraser

.setShadowOn() - set shadowfor line elements or arrow element. It takes boolean value.

.save() - call save (same save as on buttons bar). Can be used if save button is hidden (hiddenTools: ['save'])

.doScale({ width, height, scale }) - scale the image and resize area.

Scale to match the width and scale height proportinally (e.g. 50x32 will become 100->64):

.doScale({width: 100})

Scale to fill width and height (e.g. 50x32 will become 11->15):

.doScale({width: 11, height: 15})

Scale x2 (e.g. 11x12 will become 22->24):

.doScale({ scale: 2 })

setZoom(zoomPercentage) - sets the current zoom percentage

Example:

var p = Painterro()
p.show()

Translation 📙

Want to translate Painterro into your language?

If you need one of languages in table below, just pass pass language parameter, for example:

Painterro({
  language: 'es'  // Spanish
}).show()

Translated languages:

language param	Name
ca	Catalan
de	German
en	English
es	Spanish
fa	Iran-Farsi (Persian (Ir-Fa)
fr	French
ja	Japanese
pl	Polish
pt-PT	European Portuguese
pt-BR	Brazilian Portuguese
ru	Russian
nl	Dutch

If you want to add another language, then:

1. fork to your GitHub with button on top.
2. Create empty file in folder langs [<LANG_ISO_CODE>.lang.js] for your translation. LANG_ISO_CODE should follow ISO 639-1
3. Copy content from [langs/en.lang.js] to a new file
4. Then translate all 'Strings'
5. Add reference in [js/translation.js] inside of your repo.
6. After that create pull-request, or just open issue if you don't know how to create a PR.

🤔 Found a bug in some word for your language? Feel free to edit on GitHub directly and suggest a fix.

If you want to translate or change strings without contributing you can do this by passing translation parameter, for example:

Painterro({
  translation: {
    name: 'ua',
    strings: {
      apply: 'Застосувати'    
      // other strings
    }
  }
}).show()

For all strings that should be translated, see [langs/en.lang.js]

Saving image 💾

You should provide your own save handler, that will post/update image on server or will pass image to other frontend components. In this section we will provide several backend examples on python Flask (easiest web server for python). Anyway if you will face any python exception you can use super-helpfull fixexception.com service to fix any issue you will face 💪.

Binary saving

You can post data with binary multipart/form-data request which is the most efficient way to pass data to backend. Example uses raw XMLHttpRequest. Of course, you can use fetch, jQuery, etc insead.

var ptro = Painterro({
  saveHandler: function (image, done) {
    var formData = new FormData();
    formData.append('image', image.asBlob());
    // you can also pass suggested filename 
    // formData.append('image', image.asBlob(), image.suggestedFileName());
    var xhr = new XMLHttpRequest();
    xhr.open('POST', 'http://127.0.0.1:5000/save-as-binary/', true);
    xhr.onload = xhr.onerror = function () {
      // after saving is done, call done callback
      done(true); //done(true) will hide painterro, done(false) will leave opened
    };
    xhr.send(formData);
  }
})
ptro.show();

Here is python flask backend example (of course same can be implemented using any technology):

@app.route("/save-as-binary/", methods=['POST'])
def binary_saver():
    filename = '{:10d}.png'.format(int(time()))  # generate some filename
    filepath = os.path.join(get_tmp_dir(), filename)
    request.files['image'].save(filepath)
    return jsonify({})

See full example in example directory. You can run it used python3 with installed Flask (pip install flask).

Base64 saving

You can also same image by posting base64 string via plain POST json call. Please note that base64 encoding is less efficient then binary data, for example some 1920 x 1080 image took 402398 bytes for base64 upload. The same image took 301949 bytes with multipart/form-data.

var ptro = Painterro({
    saveHandler: function (image, done) {
      // of course, instead of raw XHR you can use fetch, jQuery, etc
      var xhr = new XMLHttpRequest();
      xhr.open("POST", "http://127.0.0.1:5000/save-as-base64/");
      xhr.setRequestHeader("Content-Type", "application/json");
      xhr.send(JSON.stringify({
        image: image.asDataURL()
      }));
      xhr.onload = function (e) {
        // after saving is done, call done callback
        done(true); //done(true) will hide painterro, done(false) will leave opened
      }
    },
    activeColor: '#00b400'  // change active color to green
});
ptro.show();

Backend should convert base64 to binary and save file:

@app.route("/save-as-base64/", methods=['POST'])
def base64_saver():
    filename = '{:10d}.png'.format(int(time()))  # generate some filename
    filepath = os.path.join(get_tmp_dir(), filename)
    with open(filepath, "wb") as fh:
        base64_data = request.json['image'].replace('data:image/png;base64,', '')
        fh.write(base64.b64decode(base64_data))
    return jsonify({})

Saving to WYSIWYG

You can just insert image as data url to any WYSIWYG editor, e.g. TinyMCE:

    tinymce.init({ selector:'textarea', });
    var ptro = Painterro({
      saveHandler: function (image, done) {
        tinymce.activeEditor.execCommand('mceInsertContent', false, '<img src="' + image.asDataURL() + '" />');
        // after saving is done, call done callback
        done(true); //done(true) will hide painterro, done(false) will leave opened
      }
    })

Format and quality

When you call image.asDataURL() or image.asBlob(), you can also specify image mime type (format), e.g. image.asDataURL('image/jpeg').

Default type is mimetype used by image which was loaded into Painterro, or "image/png" if image was created from scratch.

If type is image/jpeg or image/webp, you can also define image quality from 0.0 to 1.0, default is 0.92, example: image.asDataURL('image/jpeg', 0.5)

Save to jpeg or png depending on whether there is an alpha channel

An efficient way to save an image might be implmented by checking whether image has some alpha pixels:

• If yes - we need to serve image in less efficient png format
• Otherwise lets just use JPEG This is very simple with next:

var ptro = Painterro({
  saveHandler: function (image, done) {

    image.asBlob(image.hasAlphaChannel() ? 'image/png' : 'image/jpeg');
    // upload blob
  }
})

Example: Open Painterro by Ctrl+V

document.onpaste = (event) => {
  const { items } = event.clipboardData || event.originalEvent.clipboardData;
  Array.from(items).forEach((item) => {
    if (item.kind === 'file') {
      if (!window.painterroOpenedInstance) {
        // if painterro already opened - it will handle onpaste
        const blob = item.getAsFile();
        const reader = new FileReader();
        reader.onload = (readerEvent) => {
            window.painterroOpenedInstance = Painterro({
              onHide: () => {
                window.painterroOpenedInstance = undefined;
              },
              saveHandler: (image, done) => {
                console.log('Save it here', image.asDataURL());  // you could provide your save handler
                done(true);
              },
            }).show(readerEvent.target.result, item.type);
        };
        reader.readAsDataURL(blob);
      }
    }
  });
};

If you face any painterro errors (exceptions), please reffer to Painterro page on FixJSError

Development 🔨

Latest supported NodeJS version is 16, use nvm to switch to it:

nvm install 16
nvm use 16

Code written on ES6 which transplited by Babel and packed (minified) to a single file using webpack. All configs are inside so all you have to do after pulling repo is installing node modules:

cd painterro
npm ci

Building painterro

npm run build

Result file for <script> import is build/painterro.min.js.

Actually, above command produces 4 versions of library:

• build/painterro-x.y.z.min.js, build/painterro.min.js the same files but with different filenames (with and without versiontag) - this is var version which will be loaded as global variable (var painterro = <Library class>) when you will import it as <script src='painterro.min.js' /> tag. So this is for script tag only.
• build/painterro.commonjs2.js - this version sutable for js require/import. That's why it is used as entry point in package.json file - if you are using webpack or other tool that can handle require/import of commonjs2 libraries then you can do npm install painterro, and do import painterro and it will use commonjs2 version.
• build/painterro.amd.js and build/painterro.umd.js - these both are same as above but for AMD and UMD importers respectivly.

Dev-server

To start hot-reload dev server (for reloading code "on the fly"):

npm run dev

Then open http://localhost:3000 with demo page

Editing source on the fly for painterro imported from side webpack app (e.g. your project SPA)

1. If your side app uses 'eslint' it, most likely side app will need eslint-plugin-import:

npm i eslint-plugin-import

2. Since compiled painterro commonjs2 file already linted and minimized you need to exclude it from linting:

Add to package.json of your side app:

  "eslintIgnore": [
    "/home/ivan/devforth/painterro/build/painterro2.commonjs.js"
  ],

where /home/ivan/devforth/painterro is a folder with Painterro sources

3. Replace

import Painterro from 'painterro';

with

import Painterro from '/home/ivan/devforth/painterro/build/painterro.commonjs2.js';

4. Go to painterro source folder and run:

watch npm run build

Regenerating icons font

If you need add/edit icons in res folder, please after editing run:

npm run buildfont

For font generation we use method described here: How to generate a webfont (automated setup)

Contributing

Pull-requests are welcome.

If you want to say thank us Patreon is here

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