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Image Compressor

Reduce image file size with adjustable quality while previewing before and after results in your browser.

Upload Image

Drop a JPEG, PNG, or WebP file to compress it locally.

Drop an image here or click to browse

Supports JPEG, PNG, and WebP

No image selected

Drop or browse for an image to preview before/after compression.

Quality

Lower quality produces smaller files. PNG ignores the quality setting in most browsers.

80%

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Why people trust ToolMint

Free utilities designed for privacy, speed, and everyday reliability.

  • 100% Free

    Core tools stay free with no paywall to unlock basics.

  • No Registration Required

    Open a tool and start immediately - no account needed.

  • Privacy First

    We avoid unnecessary collection and keep processing local when possible.

  • Browser Processing

    Most tools run in your browser so your input never needs a server round-trip.

  • Fast & Secure

    HTTPS everywhere with instant, client-side results for everyday tasks.

  • Mobile Friendly

    Layouts and controls are built for phones, tablets, and desktops.

  • Updated Regularly

    Tools and content are improved continuously as the platform grows.

Tool statistics

Local visit data for this browser only.

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Category
Image
Version
1.0.0

Key Features

  • Adjustable quality slider

    Fine-tune compression strength from 10% to 100% to balance file size against visual fidelity.

  • Before & after comparison

    Compare original and compressed previews side by side, with exact size and percent-saved figures.

  • Format-aware encoding

    Automatically re-encodes JPEG, PNG, and WebP files using the Canvas API while keeping the original format where supported.

  • Private & local

    Images are processed entirely in your browser - nothing is uploaded to a server at any point.

How to Use

  1. 1

    Upload an image

    Drop a JPEG, PNG, or WebP file, or click to browse and select one from your device.

  2. 2

    Set the quality level

    Move the slider to balance target file size against acceptable visual quality loss.

  3. 3

    Compare the previews

    Review the before-and-after preview along with the reported percentage saved.

  4. 4

    Download the result

    Save the compressed image once you are satisfied with the size and quality trade-off.

Use Cases

  • Speeding up website images

    Shrink hero banners, blog images, and product photos so pages load faster and rank better on speed-sensitive metrics.

  • Reducing email attachment size

    Compress photos before attaching them to emails that have strict size limits or slow recipient connections.

  • Meeting upload size limits

    Shrink an image below a form, CMS, or messaging app upload limit without needing separate desktop software.

  • Preparing social and blog assets

    Optimize images for social posts or articles where smaller files mean faster previews and less bandwidth usage.

Examples

Web photo optimization

Compress a 2 MB JPEG to under 500 KB for faster page loads.

hero-banner.jpg (2.1 MB)
hero-banner-compressed.jpg (~480 KB, 77% smaller)

Email attachment shrink

Reduce a high-resolution photo before attaching it to an email with a 5 MB limit.

product-photo.png (4.6 MB)
product-photo-compressed.png (~1.8 MB, 61% smaller)

Benefits

  • Speed up website image delivery and page load times
  • Reduce email attachment sizes without separate software
  • Optimize social and blog assets quickly before publishing
  • Compare original and compressed quality before committing
  • No account, install, or upload to a remote server required

Best Practices

  • Start around 80% quality for photos - lower it only if you still need a smaller file.
  • Use PNG for graphics with sharp edges or transparency; use JPEG or WebP for photographs.
  • Re-compress only once when possible - repeated lossy compression stacks visible artifacts.
  • Check the before-and-after preview at full size before publishing a heavily compressed image.

Common Mistakes

  • Over-compressing until visible artifacts and blockiness appear in photographs.
  • Re-compressing the same JPEG file repeatedly, which stacks quality loss with every pass.
  • Using PNG quality settings expecting the same effect as JPEG, when PNG ignores lossy quality controls.

Privacy Notice

All compression runs locally in your browser using the Canvas API. Images are never uploaded to ToolMint servers or any third party.

About This Tool

What is this tool?

An image compressor reduces file size by re-encoding images with a configurable quality level using your browser’s Canvas API, while keeping the original pixel dimensions unchanged.

Why use it?

Smaller images load faster on websites, use less bandwidth on mobile connections, and help meet upload size limits for forms, email, and messaging apps.

Limitations

This tool does not resize pixel dimensions, batch-process multiple files at once, or apply next-generation encoding formats like AVIF.

Frequently Asked Questions

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