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Free Online Image Tools

Browser-based tools built for GIMP users and designers. No download, no signup, no watermarks. Your images never leave your browser.

Image Resizer

Resize images to exact dimensions. Lock aspect ratio, choose output format (PNG, JPG, WebP).

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Image Compressor

Reduce image file sizes for faster web loading. Set quality level and download the compressed file.

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Color Palette Generator

Upload an image and extract its dominant colors as HEX values. Perfect for branding and design.

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Color Contrast Checker

Check WCAG 2.1 contrast ratios for foreground and background color combinations. Test AA and AAA compliance.

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DPI & Print Size Calculator

Calculate print dimensions from pixel size and DPI. Find the right resolution for printing photos and graphics.

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Aspect Ratio Calculator

Calculate and convert aspect ratios. Supports 16:9, 4:3, 1:1, 3:2, 9:16, and custom ratios.

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Image Format Converter

Convert images between PNG, JPG, and WebP formats. No quality loss option available.

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Transparency Checker

Check if a PNG or WebP has a transparent background. Preview on a checkerboard pattern.

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Gradient Generator

Build linear, radial, or conic CSS gradients with a live preview. Add up to 5 color stops and download a PNG swatch.

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GIMP Keyboard Shortcuts

Complete GIMP shortcut cheat sheet - 96 shortcuts in 11 categories. Filter, search, and print as PDF.

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Image Resolution Calculator

Convert pixels to print size and back. Enter dimensions and DPI to calculate print output in inches and cm.

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Color Blindness Simulator

Upload an image and see how it appears to people with deuteranopia, protanopia, tritanopia, and achromatopsia.

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Image File Size Estimator

Estimate PNG, JPG, WebP file sizes by dimensions and DPI with no upload needed. Instant calculation.

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Why Use GIMP.cc Tools?

Privacy First

Your images are processed server-side and never stored. We do not retain, share, or analyze your uploaded files.

Fast & Free

No account required. No watermarks. No file size limits beyond 15 MB. Just upload and get your result.

GIMP-Focused

These tools are designed to complement your GIMP workflow. Prep files before importing, or quickly check properties.

Tool Quick Reference

Choose the right tool for your task. All tools run in your browser - No installation needed.

Tool Best For Input Output Max Size
Image Resizer Changing image dimensions for web, social media, or print PNG, JPG, WebP, GIF PNG, JPG, WebP 15 MB
Image Compressor Reducing file size for faster web page loading PNG, JPG, WebP, GIF JPG 15 MB
Color Palette Generator Extracting dominant colors from photos or artwork PNG, JPG, WebP, GIF HEX codes, CSS 15 MB
Color Contrast Checker Checking WCAG AA/AAA accessibility compliance Two hex colors Pass/fail ratings -
DPI Calculator Finding the right resolution before sending to print Pixels + DPI Print dimensions -
Aspect Ratio Calculator Scaling dimensions without distortion Width or height Proportional dimensions -
Format Converter Converting between PNG, JPG, and WebP PNG, JPG, WebP, GIF PNG, JPG, or WebP 15 MB
Transparency Checker Verifying a PNG actually has a transparent background PNG, WebP Yes/No + preview 15 MB
Gradient Generator Creating CSS gradients and downloading PNG swatches Color pickers CSS code, PNG -

Image Format Guide

Not sure which format to use? Here's when to choose each one.

JPG
Photographs & web images
  • Smallest file size
  • Universal support
  • No transparency
  • Lossy compression
PNG
Logos, graphics & screenshots
  • Transparency support
  • Lossless quality
  • Larger than JPG
  • No animation
WebP
Modern web - Best of both
  • Smaller than PNG/JPG
  • Supports transparency
  • No print/email use
  • All modern browsers
GIF
Simple animation only
  • Animation support
  • Basic transparency
  • 256 colors only
  • Large file sizes

Common Questions

Yes - Completely free, no sign-up required, no watermarks, and no hidden limits beyond the 15 MB file size cap on image uploads.
No. Uploaded images are processed in memory and returned immediately. We do not write files to disk or retain any user data.
Image upload tools accept files up to 15 MB. The calculator and color tools have no file size limit since they don't require uploads.
Yes. All tools are mobile-responsive and work in any modern browser on iOS and Android without needing to install an app.
WebP uses a more efficient compression algorithm (based on VP8 video codec) that preserves more detail at equivalent or smaller byte counts compared to JPEG's DCT-based compression.
Use the Image Resizer with the Sinc (Lanczos) resampling option for the highest quality downsample. For upscaling, NoHalo or Cubic tend to produce the sharpest results. Avoid resizing more than 2× from the original size.
Standard print is 300 DPI. Newspaper print uses 200 DPI. Large-format banners viewed from a distance can use 100–150 DPI. Screen display is typically 72–144 DPI depending on the monitor.
Yes - The Color Contrast Checker tests both AA (4.5:1 for normal text, 3:1 for large text) and AAA (7:1 for normal, 4.5:1 for large) thresholds as defined by WCAG 2.1.

Using These Tools in Your GIMP Workflow

Before opening in GIMP

  • Use the Image Resizer to downscale very large photos before editing - GIMP will open them faster.
  • Check the DPI Calculator to confirm your image has enough resolution before starting a print project.
  • Use the Format Converter to convert unsupported formats to PNG before importing into GIMP.

After exporting from GIMP