Free Image Compressor & Optimizer — Reduce File Size Online
Compress JPEG and PNG images while preserving visual quality. Adjust compression level and see a live preview comparison — all in your browser.
Best For
Use Image Optimizer when you need to prepare visual assets without sending files through a slow desktop workflow. The page is designed around a focused workflow: bring in the image, screenshot, or design asset, make the adjustment or check, then download the final image in the format or size your project needs.
Most work happens locally in your browser, which keeps files and text on your device and makes quick repeat checks practical. Review the output, then download the final image in the format or size your project needs.
Common workflows
- Email Attachments
- WordPress Uploads
- Shopify Product Photos
- Real Estate Listings
Features
Quality Control
A slider lets you dial in exactly the right balance between file size and visual quality.
Side-by-Side Preview
Compare the original and compressed image before downloading so you know exactly what you're getting.
Private & Local
Compression happens entirely in your browser using the Canvas API. No files are ever uploaded.
How It Works
Click or drag a JPEG or PNG image onto the tool.
Move the quality slider and watch the file size estimate update in real time.
See both the original and compressed version side by side to confirm quality.
Click download to save the compressed image at your chosen quality.
Frequently Asked Questions
Related Tools
Crop and resize any photo to the exact pixel dimensions required for Twitter, Facebook, Instagram, LinkedIn, and more. Pick a platform preset, frame your image, and download.
Convert a PNG, JPG, or GIF into a scalable vector graphic that stays sharp at any size. Best results with logos, icons, and simple illustrations — everything runs in your browser.
Upload two versions of a PDF and see exactly what changed, page by page. Differences are highlighted visually — ideal for reviewing contracts, reports, and any revised document.