GitHub | npm | DEMO

Painterro is JavaScript paint widget which allows editing images directly in a browser. It can be easily integrated into your website or blog by including only one js file and calling initialization code.

With Painterro you can:

• Paste image from clipboard with Ctrl+V (e.g. PtnScr screenshot), drag and drop it into widget, or load with open dialog
• Crop image by defined area
• Paint primitives (alpha color can be used)
• Add text
• Rotate / resize (scale) image
• Pixelize some area to hide sensitive data

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 it for processing 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.

Painterro is written with vanilla JS to stay lightweight and minimalistic. Code written on ES6 which transplited by Babel and packed to a single file using webpack.

• Table of contents
• Installation
  • With npm
  • By including script
  • Read after installation
• Supported hotkeys
• Configuration
  • UI color scheme
  • Translation
• Saving image
  • Base64 saving
  • Binary saving
  • Saving to WYSIWYG
  • Format and quality
• Development
  • Building painterro
  • Dev-server
  • Regenerating icons font
  • ToDo list

If you have npm-based project you can run:

npm install painterro --save

Then in your code

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

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

Then insert <script> e.g:

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

Then in your code:

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

See fiddle example

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

You can pass parameters map to Painterro constructor:

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

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

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

.show(openImage) - 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

.hide() - hide instance

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

Example:

var p = Painterro()
p.show()

Want to translate Painterro into your language? Just open file js/translation.js, copy this.translations dict to text editor and translate all 'Strings'. Then fork and create pull-request, or just open issue if you don't know how to create a PR.

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 can be translated, see js/translation.js

You should provide your save handler, which will post/update image on server or will pass image to another frontend components.

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 () {
      done(true);
    };
    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).

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({})

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() + '" />');
        done(true)
      }
    })

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 'image/png'. 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)

After pulling repo install node modules:

cd painterro
npm install

npm run build

Result file is build/painterro.js

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

npm run dev

Then open http://localhost:8080 with demo page

Add/edit icons in res folder. Then run

npm run buildfont

Pull-requests are welcome.

• Add recent colors pallete
• Add recent image sizes in resize tool
• Ability to save loacaly
• line arrows
• Edit button on page tags (provide selector)