Rebelle FAQ

If you need help using Rebelle, refer to the included manual first. You will find it easy to read and full of information. Before asking questions please read Frequently Asked Questions, you might find the answer to your question faster.

Feature Requests & Plans

What features do you plan to implement in the future updates?

We have a long list of small to large features and improvements we would like to implement. Version 1.0 had all basic features needed for painting. Now we continue step by step with implementing new features, but would like to keep Rebelle as simple and intuitive as possible.

Roadmap - what we are planning:

DONE - Add brush preset groups - watercolor, acrylic, paster, marker, airbrush, ...
DONE - Circle HSL/HSB palette, RYB and RGB (no RYB yet)
DONE - Palette order: Hue and Latest color
DONE - Palette Mix mode available also for layers
DONE - New canvas size presets
DONE - Show / hide all panels with Tab
DONE - Show / hide paper structure
DONE - Layer locking
DONE - Even more intuitive interface
DONE - Optimization of watercolor simulation
DONE - User color palette groups with palette color names
DONE - Hires paper textures with scaling
DONE - Rotate and Mirror canvas
DONE - Smoother and faster painting
- Add different brushes shapes - flat, bamboo, etc.
- Custom brushes, shareable in online library
- Set user brush names
- More paper and canvas textures
- Resize canvas
- Paint and import Wet mask and masking layer
- Strength control for paper
- Add salt, alcohol, salt water, etc.
- and a lot more...

A lot more features will be implemented, this is just rough plan - the ideas we would like to implement.

Do you plan to increase brush size?

The watercolor brush size is set to maximum 150 pixels (when slider is set to 100), because the app is not yet fully optimized and larger brush would lag a lot during the painting. We would like to increase brush size when Rebelle will be better optimized.

Do you plan to implement more brush shapes?

We have a plan to add more brushes shapes - flat, bamboo, different shapes, etc.

Do you plan to implement masking fluids?

Actually you can mask fluid right now - click "Show Wet" and paint with Water and Dry brush to create dry or wet mask and then paint over it with brush, if you use more water on wet parts, water will flow and create nice watercolor effects. Fully featured making fluids will be implemented later.

Do you plan to implement salt, vodka, salt water, water cement, rubber, scraping paper, etc.?

We have a plan to add many special features which are used in painting process. Our watercolor simulation running behind allows to use different creative real or fictional mediums.

Will Rebelle be available on Mac App Store?

We have no plan to release Rebelle on Mac App Store.

Image, Painting & Pen Pressure

Is there any way to increase the default resolution from 1280x900 pixels?

You can set you canvas size in menu "File"->"New...". The maximum canvas resolution depends on your computer memory.

Rebelle brush is lagging with larger canvas, why is that?

The math running behind the painting process is quite complicated, so for larger canvases it would be always better to have faster processor.

The watercolor diffusion is fast, is there any workaround?

The speed of watercolor diffusion depends on amount of water on the canvas. You can pause the diffusion anytime with "Pause Diffusion" button, or if you are satisfied with watercolor results click "Fast Dry" in Layers panel to dry all water on canvas.

Does Rebelle support pressure sensitivity and touch features on Microsoft Surface tablets and Surface Book?

Yes, Rebelle supports Microsoft Surface touch features with pen pressure sensitivity.

The old Rebelle version (1.4 and lower) needed a N-Trig WinTab driver installed for Surface tablets. In any case if you need the WinTab driver: You can find the driver for Surface 3 here and for Surface 4 here by clicking on "Download". It's listed at the bottom amongst other Surface Pro drivers (
It is also recommended to use the Microsoft Surface Hub to set the correct pressure.

Purchase, Registration & License

My Registration Key does not work.

If the registration key input text box is red - it means that there are more letters, than needed. Please copy & paste your registration details you received as sometimes it happens that users misspell numbers with letters and vice versa when entering the key manually.

Internet connection is required for activation.

Why was my credit card declined?

Unfortunately when the payment processing company declines a transaction on behalf of your bank or card issuer, it does not tell us why.

Your card may have been declined by your bank or card issuer for a variety of reasons; common reasons include:
- Incorrect credit card number or expiration date
- Insufficient funds
- Some banks will reject charges based on their own fraud rules

You will need to contact your bank or card issuer to find out the specific reason your card was declined, since they are the one declining the transaction, and not us.

You may re-attempt the transaction or choose “PayPal” Payment method. You don’t need to have a PayPal account - after you click “Checkout with PayPal” method, you will be given a choice to “Pay with a credit or debit card”.

I lost my installation file and Registration Key and... my computer!

- If you lost your installation file, you can download it again from here.
- If you lost your Registration Key, enter your email (Your ID) here, and we will send you the keys.
- If you lost your computer, be happy your family and friends are healthy, it's more important than lost computer. And we can still send you your installation file and Registration Key :).

How many computers can I install a single license of Rebelle on?

You may install Rebelle on multiple computers provided that not more than one of those computers is in use simultaneously and that those computers are solely for your own personal use. Rebelle may be installed on a computer that is for multiple users but it may not be installed on more than one computer regardless of whether those computers are operated simultaneously or not. Users may use the Software for commercial, or for-profit activities as well as for personal, non-commercial, or non-profit activities.

This is the complete license agreement included in a software installation.

I need an invoice for Rebelle purchase.

Please write us at and include your full invoicing details. We will send you an invoice in a timely manner.

Rebelle Manual

Interface Languages

Within application you can choose from these languages: English, German, French, Spanish, Finnish, Italian, Portuguese (BR), Simplified and Traditional Chinese, Japanese, Korean, Russian, Turkish, Polish, Slovenian and Slovak.

If you would like to make translation for your fellow artists, please contact us at

System requirements

Minimum: Intel i3 or equivalent AMD processor, 4GB RAM, 100MB hard disk space, Open GL graphics card with 1GB RAM, Windows Vista (64-bit or 32-bit) or Mac OS X 10.8 - on these configurations watercolor simulation may work slower, faster processor and more memory is preferable.

Recommended: Intel i7 or equivalent AMD processor, 16GB RAM, 100MB hard disk space, Open GL graphics card with 2GB RAM, 64-bit system Windows 7, 8, 10 or Mac OS X 10.9 and newer, Wacom or Surface compatible tablet

Please note: If watercolor flow is slow, press “Fast Dry” button in Layers panel to dry all water.