There are a number of free photo editing apps that have been well-reviewed on Reddit. Here are a few options:
- GIMP: This is a free, open-source photo editor that is available for Windows, macOS, and Linux. It has a large community of users and is a popular choice for those looking for a powerful yet free photo editor.
- Canva: This is a web-based photo editor that is popular for its ease of use and wide range of templates and design tools. It has a free version that includes basic editing features and access to a large selection of templates and design elements.
- Fotor: This photo editor is available for web, iOS, and Android, and it offers a range of basic and advanced editing tools. It has a free version that includes most of the features, with some premium features available as in-app purchases.
- Photoscape: This is a free photo editor for Windows that includes a wide range of basic and advanced editing tools. It is easy to use and has a friendly interface.
- Color Splash: Color splash is a photo editing effect that allows you to convert a photograph to black and white while keeping one or more elements in color.
- Visage Lab: Visage Lab is a photo editor that is available for iOS and Android. It is designed specifically for editing portrait photos and includes a range of features for enhancing and retouching faces and skin.
- Pixlr: Pixlr is a photo editor that is available for web, iOS, and Android. It offers a range of basic and advanced editing tools.
Ultimately, the best photo editing app for you will depend on your specific needs and preferences. It may be helpful to try out a few different options to see which one works best for you.
GIMP:

GIMP (GNU Image Manipulation Program) is a free, open-source photo editor that is available for Windows, macOS, and Linux. It is a powerful photo editing tool with a wide range of features, including:
Features:
- Basic editing tools such as crop, resize, and rotate
- Advanced editing tools such as color correction, retouching, and compositing
- Support for layers, allowing you to work on different parts of an image independently and combine them later
- A wide range of filters and effects that you can apply to your images
- Support for various file formats, including JPEG, PNG, and TIFF
GIMP has a large community of users and is a popular choice for those looking for a powerful yet free photo editor. It has a somewhat steep learning curve, but there are many resources available, including documentation and tutorials, to help you get started.
Canva:

Canva is a web-based design platform that includes a photo editor. It is popular for its ease of use and wide range of templates and design tools. The free version of Canva includes basic photo editing features such as cropping, resizing, and adjusting the brightness, contrast, and saturation of images. It also includes access to a large selection of templates and design elements, such as graphics, text, and shapes, that you can use to create designs for social media, marketing materials, and other purposes. Canva also has a paid version called Canva Pro that includes additional features and tools for professional design work.
Features:
- Basic editing tools such as crop, resize, and rotate
- Adjustment tools for brightness, contrast, and saturation
- A selection of filters and effects that you can apply to your images
- A range of design elements, including graphics, text, and shapes, that you can use to create designs
- Templates for social media posts, marketing materials, and other purposes
- Collaboration tools that allow you to work with others on designs in real-time
The free version of Canva includes access to most of these features, with some premium features available as part of a paid subscription to Canva Pro. Canva is popular for its ease of use and wide range of templates and design tools, making it a good choice for those looking to create professional-looking designs quickly and easily.
fotor:

Fotor is a photo editor that is available for web, iOS, and Android. It offers a range of basic and advanced editing tools, including:
Features:
- Basic editing tools such as crop, rotate, and resize
- Adjustment tools for exposure, white balance, and color
- A range of filters and effects that you can apply to your images
- A selection of design elements, including graphics, text, and shapes, that you can use to create designs
- Templates for social media posts, marketing materials, and other purposes
Fotor has a free version that includes most of these features, with some premium features available as in-app purchases. It is easy to use and has a friendly interface, making it a good choice for those looking for a simple yet powerful photo editor.
photoscape:

Photoscape is a free photo editor for Windows that includes a wide range of basic and advanced editing tools. It is easy to use and has a friendly interface. Some of the features of Photoscape include:
Features:
- Basic editing tools such as crop, resize, and rotate
- Advanced editing tools such as curves, levels, and color balance
- Multiple image processing functions, including red-eye correction, color adjustment, and sharpening
- A viewer that allows you to view and organize your photos
- A batch editor that allows you to apply editing tools to multiple images at once
- A screen capture tool that allows you to take screenshots and edit them
Photoscape is a good choice for those looking for a free photo editor with a wide range of features and an easy-to-use interface.
Color Splash:

Color Splash is a photo editing effect that allows you to convert a photograph to black and white while keeping one or more elements in color. This can be used to create a dramatic or artistic effect, drawing attention to the colored elements and adding contrast to the image.
Features:
- Color selection or brush tools: These allow you to select the elements in the image that you want to keep in color, while the rest of the image is converted to black and white.
- Adjustment tools: Some photo editors may allow you to adjust the intensity or saturation of the colored elements, or to fine-tune the black and white conversion.
- Presets: Some photo editors may include presets for common Color Splash effects, such as keeping only skin tones or flowers in color.
- Batch processing: Some photo editors may allow you to apply the Color Splash effect to multiple images at once, saving you time if you want to create the same effect on multiple photos.
The specific features available will depend on the photo editor you are using.
Visage Lab:

Visage Lab is a photo editor that is available for iOS and Android. It is designed specifically for editing portrait photos and includes a range of features for enhancing and retouching faces and skin. Some of the features of Visage Lab include:
Features:
- Automatic skin smoothing and blemish removal
- Eye enlargement and brightening
- Lip color and shape adjustment
- Facial structure adjustment
- Hair color and style adjustment
- Makeup application and enhancement
Visage Lab is easy to use and has a friendly interface, making it a good choice for those looking to quickly and easily touch up their portrait photos. It also includes a range of filters and effects that you can apply to your images to create a variety of looks.
Pixlr:

Pixlr is a photo editor that is available for web, iOS, and Android. It offers a range of basic and advanced editing tools, including:
Features:
- Basic editing tools such as crop, rotate, and resize
- Adjustment tools for exposure, white balance, and color
- A wide range of filters and effects that you can apply to your images
- A selection of design elements, including graphics, text, and shapes, that you can use to create designs
- Support for layers, allowing you to work on different parts of an image independently and combine them later
Pixlr has a free version that includes most of these features, with some premium features available as in-app purchases. It is easy to use and has a friendly interface, making it a good choice for those looking for a simple yet powerful photo editor.