Launch OpenGPEX

OpenGPEX 1.x documentation (legacy editor).

v2 Docs

Common Tasks

Quick, task-oriented guides for the most frequent operations. Each section answers a "How do I...?" question.


How Do I Clip (Crop) an Image?

  1. Press Space to enter Clip mode (or select the Clip tool in the Option Bar)
  2. Drag the clip handles to define your desired area
  3. Optionally choose an aspect ratio preset (1:1, 4:3, 16:9, etc.)
  4. Click Apply as Mask

See Selection & Clipping for advanced clip features (shapes, feathering, selection operations).


How Do I Resize an Image?

Resize the Canvas (Change Dimensions)

  1. Enter Clip mode (press Space)
  2. Click Resize Canvas in the Option Bar
  3. Enter the desired Width × Height in pixels
  4. Confirm to apply

Resize on Export

  1. Open the Image Info drawer (left sidebar)
  2. Set target Width × Height or scale percentage
  3. Set DPI (72 for screen, 300 for print)
  4. Click Save Clip — the resample algorithm handles quality scaling

How Do I Remove a Background?

AI Automatic Removal (Recommended)

  1. Select the image layer
  2. Open AI Tools drawer (right sidebar) → BG Remover
  3. Click the removal button — the AI detects the subject automatically
  4. Result: background becomes transparent via a bitmap mask

Manual Selection Methods

You can also isolate subjects manually using selection tools:

  • Lasso: Draw around the subject freehand or with polygon points, then delete the background
  • Magic Wand: Click on the background color to select it, then delete the selection
  • SAM (AI Segmentation): Click on the subject to get a precise selection, then invert and delete

Refinement with Eraser

  • Use the Eraser (E) to hide any remaining background areas
  • Press Tab to switch to the Restore tool to bring back any incorrectly removed subject areas

See AI Tools for model options and Selection & Clipping for selection tool details.


How Do I Add Text?

  1. Press T to activate the Text tool (or open Drawing Tools drawer → Text)
  2. Click anywhere on the canvas — a text layer is created
  3. Start typing
  4. Adjust font, size, color, alignment in the Option Bar
  5. Press Escape or click outside to finish editing

See Drawing Tools for detailed text and brush documentation.


How Do I Adjust Colors?

  1. Select the layer you want to adjust
  2. Open the Adjustments drawer (right sidebar), or use a keyboard shortcut:
Tool Shortcut Description
Basic Ctrl/Cmd + U Quick sliders for brightness, contrast, saturation
Curves Ctrl/Cmd + M Precise tonal control
Levels Ctrl/Cmd + L Histogram-based adjustment with Auto
Color Balance Ctrl/Cmd + B Shadow/midtone/highlight color shifts
Channel Mixer Ctrl/Cmd + Shift + X Per-channel color control

All adjustments are non-destructive and previewed in real-time.

See Color Adjustments for detailed documentation.


How Do I Export My Image?

  1. Open the Image Info drawer (left sidebar)
  2. Choose format: JPEG, PNG, WebP, AVIF, TIFF, or BMP
  3. Adjust quality (for lossy formats) and dimensions
  4. Click Save

Quick Format Guide

Need Recommended Format
Photos for web WebP or JPEG (quality 80-90)
Transparency needed PNG
Smallest file size AVIF
Print production TIFF
Animation GIF (via the Animated Images drawer — see Export & File Formats)

See Export & File Formats for full details.


How Do I Save My Project?

Save Locally

Your project auto-saves to browser storage. There is no local .gpex file export in this release — .gpex files are created only when syncing to the cloud.

Save to Cloud

  1. Open the ExtendButton (top right) → Cloud menu
  2. Click Sync to Cloud
  3. Your project is stored online and accessible from any device

How Do I Use AI to Upscale a Low-Res Image?

  1. Select the layer you want to enlarge
  2. Open AI Tools drawer → Upscaler
  3. Choose an upscale model from the list and download it (first time only — the model is cached locally for future use; you can delete it anytime to free up storage space)
  4. Choose 2× or 4× scale factor
  5. Click to start — wait for local AI processing (runs entirely in your browser)
  6. The layer is replaced with the enhanced version

Next Steps


Last updated: 2026-07-30