Compress Image Online — Free
Re-encode JPEG, PNG, or WebP photos in your browser. Compare output size and quality before downloading. No signup required.
Large image files can take longer to upload and may exceed form or email size limits. GenZDoc re-encodes JPEG, PNG, and WebP images with the browser Canvas API, so you can compare the resulting file size before downloading. Savings vary by image, format, and quality setting; lower JPEG or WebP quality can reduce detail. Processing stays in your browser. The per-file limit is 200 MB on desktop and 50 MB on mobile.
Why Use This Tool?
Instagram & Social Media
Reduce file size so photos upload faster and still look stunning on feeds.
Email Attachments
Shrink photos below the 25MB Gmail and Outlook attachment limit.
Online Forms
Compare output sizes and adjust quality when a form sets a maximum image file size.
Website Performance
Smaller image files can reduce page weight and support faster page loads.
How it works
Select a supported file from your device. Review this tool’s file and privacy details first.
Follow the steps shown by the linked tool. Processing method and time vary by operation and file.
Review the result, then download it if it meets your needs.
Frequently Asked Questions
Does compressing an image affect quality?
JPEG and WebP quality settings can reduce detail as they make files smaller. Results vary by image, so compare the preview and output size before downloading. PNG output does not use the browser Canvas quality setting.
What image formats does it support?
The tool accepts JPEG, PNG, and WebP images and lets you choose JPEG, PNG, or WebP output. You can add multiple files to one batch.
Is there a file size limit?
Each file can be up to 200 MB on desktop or 50 MB on mobile. Large batches also depend on available device memory.
Is my image uploaded to your servers?
No. The image is decoded and re-encoded in your browser using the Canvas API; this tool does not upload it to the compression service.
This landing page links to the tool. Check the tool page for supported formats, processing details, and current file limits.