Documentation

Getting Started

Jupiter Image Tools offers browser-based solutions that allow you to resize, crop, and optimize your images for various platforms. Here's how to get started:

  1. Upload an image - Drag and drop an image file onto the upload area or click the "Select Image" button to choose a file from your computer.
  2. Edit your image - Once uploaded, you can resize, crop, or rotate your image using the controls provided.
  3. Download the result - When you're satisfied with your edits, click the "Download" button to save the processed image to your computer.
Tip: For best results, start with a high-resolution image. This will ensure good quality even after resizing.

Real-World Example: See the Difference

Here's a real example of what Jupiter Image Tools can do to optimize your images while maintaining quality:

Original Image

Original dog photo View Full Size

File Size: 3.7 MB

Dimensions: Original high-resolution

Format: JPEG

Optimized Image

Optimized dog photo View Full Size

File Size: 153 KB

Dimensions: 400 × 400 pixels

Format: JPEG (Social Media Optimized)

96%
Smaller

What Was Achieved

  • File size reduced from 3.7MB to just 153KB (96% reduction)
  • Perfect square format created for social media profile picture
  • Subject remains perfectly framed despite significant cropping
  • Image quality maintained where it matters most
  • Faster loading and sharing across all platforms

Was this example helpful?

Resizing Images

Jupiter Image Tools offers preset dimensions for popular social media platforms as well as custom sizing options:

Preset Sizes

Jupiter Image Tools includes optimized presets for all major social media platforms:

Facebook

Feed Post

1200 × 630 pixels

Standard format for timeline posts

Square Post

1080 × 1080 pixels

Optimal for mobile viewing

Link Preview

1200 × 900 pixels

Image that appears when sharing links

Profile Cover

820 × 312 pixels

Banner image for personal profiles

Event Cover

1640 × 924 pixels

Featured image for events

Profile Picture

170 × 170 pixels

Your account avatar
Twitter/X

Post Image

1200 × 675 pixels

Standard image for tweets

Header Image

1500 × 500 pixels

Banner displayed at top of profile

Profile Picture

400 × 400 pixels

Your account avatar

Link Card

1600 × 900 pixels

Image shown when sharing website links
LinkedIn

Feed Post

1200 × 627 pixels

Standard format for updates

Carousel Slide

1200 × 1200 pixels

Posts with multiple images

Profile Banner

1584 × 396 pixels

Background image for profile

Profile Picture

400 × 400 pixels

Professional headshot

Company Banner

1128 × 376 pixels

Header for business pages
YouTube

Video Thumbnail

1280 × 720 pixels

Preview image for videos

Channel Banner

2560 × 1440 pixels

Header image for your channel

Channel Picture

800 × 800 pixels

Your channel's avatar
Pinterest

Standard Pin

1000 × 1500 pixels

Optimal vertical format for pins

Small Pin

600 × 900 pixels

Compact vertical format

Profile Picture

165 × 165 pixels

Account avatar

Using Presets

Click on any of the preset buttons to automatically resize your image to the dimensions required by that platform:

Instagram Post

1080 × 1080 pixels

Instagram Story

1080 × 1920 pixels

Facebook Post

1200 × 630 pixels

Twitter Post

1200 × 675 pixels

LinkedIn Post

1200 × 627 pixels

Custom Dimensions

To set custom dimensions:

  1. Enter your desired width in pixels in the "Width" field
  2. Enter your desired height in pixels in the "Height" field
  3. Click "Apply" to resize the image

Percentage Reduction

For simple proportional resizing, Jupiter Image Tools offers a percentage-based reduction feature:

  1. Enter a percentage value (1-99%) in the "Reduce by %" field
  2. Click "Apply" to resize the image down by that percentage from its original size
  3. For example, entering 50% will reduce the image to half its original dimensions
Tip: Percentage reduction maintains the original aspect ratio automatically and is calculated from the original image dimensions. This makes it easy to create smaller versions while preserving proportions.

Rotating Images

To rotate your image:

  • Click the "Rotate Left" button (↺) to rotate 90° counterclockwise
  • Click the "Rotate Right" button (↻) to rotate 90° clockwise

Each rotation is applied immediately to your image.

Cropping Images

Jupiter Image Tools offers two ways to crop your images:

Resize Crop

When you select a preset size or enter custom dimensions with "Preserve aspect ratio" checked, you can:

  1. Drag the crop area to position it exactly where you want
  2. Click "Apply" to crop the image to the selected dimensions

Manual Crop

For more control over the crop area:

  1. Press Ctrl+M to enable manual crop mode
  2. Adjust the crop area by dragging the corners or edges of the selection box
  3. Press Ctrl+A or click "Apply Crop" to crop the image
  4. Click "Cancel" to exit crop mode without changes
Tip: When "Preserve aspect ratio" is checked, the manual crop will maintain the current aspect ratio. Uncheck this option for free-form cropping.

Advanced Cropping Features

Understanding Crop Modes

Jupiter Image Tools offers two distinct cropping approaches:

  • Resize Crop: Maintains your selected dimensions while letting you position the crop area
  • Manual Crop: Full freedom to define both size and position of your crop

Aspect Ratio Controls

The "Preserve aspect ratio" checkbox affects cropping behavior:

  • When checked: Crop area maintains the same width-to-height relationship
  • When unchecked: Crop area can be freely adjusted to any shape
  • For social media images, preserving aspect ratio is highly recommended

Pro Tip

When cropping for social media, position the main subject in the center of your crop area. Most platforms will display the center portion of images in previews and thumbnails.

Professional Photography Tip: The Rule of Thirds

When cropping and resizing images for maximum visual impact, try using the "Rule of Thirds" technique that professional photographers swear by:

  • Imagine your image divided into a 3×3 grid (like a tic-tac-toe board)
  • Position your main subject—a face, product, or focal point—at one of the intersections where these lines meet
  • The top-left and top-right intersection points are particularly powerful attention-grabbers
  • This off-center placement creates visual tension and interest that centered compositions often lack

This simple adjustment transforms ordinary images into visually compelling compositions that look polished and professionally balanced. While centering works well for symmetrical subjects or social media thumbnails, the Rule of Thirds creates dynamic, engaging imagery that naturally draws the viewer's eye exactly where you want it.

Keyboard Shortcuts

Jupiter Image Tools includes several keyboard shortcuts to speed up your workflow:

Action Shortcut
Toggle Manual Crop Mode Ctrl + M
Apply Crop Ctrl + A
Cancel Crop Esc
Rotate Left Ctrl + [
Rotate Right Ctrl + ]
Reset Image Ctrl + R

Cross-Device Compatibility

Jupiter Image Tools is designed to work seamlessly across different devices:

Desktop Experience

  • Full-featured editing with keyboard shortcuts
  • High-precision cropping with mouse controls
  • Large preview area for detailed work

Mobile Experience

  • Touch-optimized interface with larger control points
  • Responsive design adapts to screen size
  • Pinch-to-zoom for precise positioning on small screens
  • Simplified controls maintain full functionality

Troubleshooting

Image appears distorted after resizing

This typically happens when aspect ratio is not preserved. Try checking the "Preserve aspect ratio" checkbox before resizing.

Crop area is fixed and can't be adjusted

You might be in Resize mode with a fixed aspect ratio. Try using Manual Crop mode (Ctrl+M) for more flexibility.

Image quality appears reduced after processing

When downloading, choose PNG format for highest quality, especially for images with text or graphics.

The app is slow when processing large images

For best performance, use images under 5000×5000 pixels. Very large images may cause your browser to slow down.

View True Size Feature

The "View True Size" feature helps you understand how your image will appear at its actual physical dimensions:

  • When enabled, this feature displays your image at 100% of its actual size
  • A measurement ruler guide appears alongside the image to provide a real-world scale reference
  • This helps you judge if elements like text and icons will be legible at the intended viewing size
  • Particularly useful when designing interface elements, buttons, or checking text readability

To use the View True Size feature:

  1. Upload and edit your image as needed
  2. Click the "View True Size" button to see your image at its actual dimensions
  3. Use the measurement ruler to gauge sizes in pixels
  4. Click the button again to return to the standard editing view
Note: The accuracy of the true size display depends on your screen's resolution and device settings. For the most accurate representation, make sure your browser zoom level is set to 100%.

Adjusting Image Quality

To reduce file size for JPEG images:

  1. Use the quality slider to select a value between 80% and 100%
  2. The estimated JPEG file size will update as you adjust the slider
  3. Click "Apply Quality" to apply the selected quality setting
Note: Quality settings only affect images when downloaded in JPEG format. PNG files use lossless compression and will not be affected by the quality slider.

Downloading Images

Once you're satisfied with your edits:

  1. Select your preferred format from the dropdown next to the Download button:
    • PNG - Highest quality, lossless compression (larger file size)
    • JPEG - Smaller file size with good quality
    • WebP - Modern format with excellent compression and quality
  2. Click the "Download" button
  3. The image will be saved to your computer's default download location
  4. The filename will include a timestamp to help you identify it
Format Tips: Use PNG for images that need transparency or highest quality. Use JPEG for photographs where file size is important. WebP offers a good balance but may not be supported by all applications.

Copying Images

For quick sharing or pasting into other applications:

  1. Edit your image as desired
  2. Click the "COPY" button
  3. A popup will appear with instructions to right-click (or press-and-hold on mobile) directly on the image
  4. Follow the instructions to use your browser's built-in copy menu options
  5. Click "OK" to dismiss the instructions
  6. The image can now be pasted into other applications
Tip: Using the browser's native copy feature is more reliable across different devices and browsers than programmatic clipboard access, which may be restricted by browser security policies.

File Size Considerations

Jupiter Image Tools displays the estimated file size of your image. Keep in mind:

  1. Larger dimensions generally result in larger file sizes
  2. The maximum file size for upload is 10MB (browser limitation)
  3. Some social media platforms have their own file size limitations
Tip: For optimal loading times on websites and social media, aim for file sizes under 1MB when possible.

Privacy & Security

Jupiter Image Tools processes all images directly in your browser:

  • Your images are never uploaded to any server
  • No data is collected about your images or usage
  • Our tools work offline once the page is loaded

This makes Jupiter Image Tools a safe choice for processing sensitive or confidential images.

Bookmarking and Partners

Jupiter Image Tools offers convenient features to help you access the tool and recommended partner services:

Bookmark This App

To save Jupiter Image Tools for easy access in the future:

  1. Click the "Bookmark This App" button in the left sidebar
  2. Follow the on-screen instructions to bookmark the page using your browser's shortcut:
    • Windows/Linux: Press Ctrl + D
    • Mac: Press Command + D
  3. The bookmark will be saved in your browser for quick access later

Partner Services

Jupiter Image Tools has partnered with leading design platforms to offer extended functionality:

  • Adobe Creative Cloud: For professional-grade image editing, retouching, and design
  • Canva Pro: For creating beautiful designs with templates, premium assets, and collaboration tools

Click the partner images in the left sidebar to learn more about these services. Links will open in a new window, keeping Jupiter Image Tools available for your ongoing work.

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