Output is larger than input
Tiny or already-compressed images can grow after re-encoding.
Keep the original when the result card shows a positive size change.
Smart Image Compressor
☆ HotCompress images for free directly in your browser. Drop multiple files, adjust target quality and optional max side, then download individual images or a ZIP without uploading files.
Smart Image Compressor overview
The image compressor reduces JPG, PNG and WebP file size in batches with quality and max-dimension controls. It is useful for web images, upload limits and email attachments, with local browser processing.
How to use Smart Image Compressor
- 1Drop JPG, PNG, WebP or another browser-readable image into the upload area, or click Choose files for batch selection.
- 2Adjust Target quality. Lower values usually reduce size more, with more visible quality loss.
- 3Set Max side when you also want to resize large images. Leave it at 0 to keep original dimensions.
- 4Wait for Compression Results to list each file with before and after sizes.
Troubleshooting
Visible quality loss
Low quality values or text-heavy screenshots make artifacts easier to see.
Raise quality to 85% or higher and avoid resizing important originals.
Large batches process slowly
Decoding and encoding large images consumes browser memory.
Process fewer files at a time or set a max side length.
Image compression options compared
Quality compression and resizing solve different size problems and can be used together.
| Method | Best for | Advantage | Notes |
|---|---|---|---|
| Target quality | Web images and previews | Often reduces JPG/WebP size significantly | Very low quality can add artifacts |
| Max side | Huge source photos used only on screens | Reduces pixel dimensions and size | Avoid for print or future cropping |
| Single download | A few selected outputs | Fast direct save | Repetitive for many files |
| ZIP download | Batch website or asset work | Saves all outputs at once | ZIP generation takes browser time |
Smart Image Compressor examples
Website hero image compression
Original
product-hero.jpg · 4.8MB · 4032x3024
Compressed
product-hero-compressed.jpg · 820KB · quality 80% · max side 1600
Actual savings depend on image content and previous compression.
Use cases
Web asset optimization
Reduce image weight before publishing pages or product galleries.
Upload size limits
Shrink avatars, document photos or receipts before submitting them.
Email attachments
Compress screenshots and photos before sending a batch of files.
FAQ
Are my images uploaded?›
No. Reading, compression and download URL creation happen locally in your browser.
Is the image compressor free?›
Yes. The core compression workflow is free and does not require sign-in.
Can I compress images in batch?›
Yes. Select or drop multiple images and the tool processes them one by one.
What quality should I choose?›
For web display, 70% to 85% is often a good start. Use higher quality for text-heavy screenshots or important documents.
What does max side 0 mean?›
0 means no dimension limit. Entering a pixel value limits the longest side to that value.
Why did a compressed image get larger?›
Some images are already highly compressed or very small. Re-encoding can increase size, and the result card will show that change.
What is the maximum file size?›
The current limit is 50MB per file to avoid excessive browser memory usage.
Does compression change image format?›
This page focuses on compression and size control, not explicit format conversion. Use related tools for HEIC to JPG or Image to PDF workflows.