Image Compressor
Free online batch image compressor for JPG, PNG, WebP. Runs locally in your browser, no upload, private and secure, no software to install
Drag images here or click to upload
JPG, PNG, WebP supported. Select multiple at once, up to 50MB each
Batch compression: pick many images, set once, process all in one click
All processing happens locally in your browser — images are never uploaded to any server
Compress images in three steps
No software to install — just open the page, everything runs locally
Add your images
Drop images into the upload area, or click "Select Images" to pick several at once. JPG, PNG, and WebP are all supported.
Tip: you can select multiple images for batch compression
Set options
Pick a quality preset and output format, and add a target width if you want to resize.
Balanced preset gives the best size-to-quality ratio
Compress and download
Hit "Compress All", then grab each file or the whole batch as a ZIP.
Converting to WebP typically saves another 30%-70%
JPG vs PNG vs WebP
Understand the core differences between the three major image formats and pick the best one for your scenario
JPG
- Lossy compression, small file size
- Great for photos and gradients
- Universally compatible across all platforms
- No transparency support
- Quality degrades with repeated compression
PNG
- Lossless compression, perfect quality
- Supports transparent backgrounds
- Ideal for icons, line art, and screenshots
- File size is usually larger
- Limited compression ratio
WEBP
- 30%-70% smaller than JPG/PNG at same quality
- Supports both lossy and lossless modes
- Supports transparency and animation
- Supported by all modern browsers
- Very old browsers don't support it
JPG vs PNG vs WebP — Key Parameters
| Feature | JPG | PNG | WebP |
|---|---|---|---|
| Compression | Lossy | Lossless | Lossy/Lossless |
| Transparency | No | Yes | Yes |
| Animation | No | No | Yes |
| Typical ratio | High | Low | Very high |
| Browser support | All | All | Modern browsers |
| Best for | Photos | Icons/Screenshots | General choice |
| Size (same quality) | Medium | Large | Smallest |
Why compress images locally
Understand the core advantages of compressing images right in your browser
Privacy & Security
Fully local
All compression happens in the browser — your images never leave the device
No data residue
Memory is released on page close, no file copies are ever stored
No account needed
No sign-up or login required; open and use, zero data collection
Professional Compression
Canvas API
Built on the browser's native Canvas interface — fast and reliable
Multi-format
Read and write JPG, PNG, and WebP, switch freely between them
Smart fallback
If compression would make the file larger, the original is kept
Efficient & Convenient
No software to install
Open your browser and start — cross-platform with zero barrier
Batch in one click
Pick dozens of images, set options once, compress them all together
Completely free
No feature limits, no usage caps, no watermarks
How image compression works
Understand the core technical pipeline of browser-based image compression
Implementation pipeline
File reading
The FileReader API reads the image as a DataURL and creates an in-memory Image object
Resize
If a target width is set, the canvas dimensions are calculated proportionally
Canvas drawing
The image is drawn onto a Canvas — PNG as-is, JPG/WebP with a white background fill
Quality compression
canvas.toBlob() is called with the configured quality for lossy or lossless compression
Smart comparison
The compressed size is compared to the original; if larger, the original is kept (except PNG)
Export
A compressed Blob is generated for individual download or zipped into a batch
Core features of the image compressor
Professional-grade image compression and format conversion
Processed locally
Images are compressed in the browser and never leave your device, so your files stay private
Completely free
No limits on count, size, or watermarks, and no sign-up required. Free to use, no catch
Batch in one click
Pick dozens of images at once, set options once, then compress and download them as a ZIP
Convert between formats
Read and write JPG, PNG, and WebP, so you can switch to the smaller WebP on the way out
Common use cases for image compression
Smaller images come in handy more often than you'd think
Website and blog images
Smaller files load faster and use less bandwidth, which also helps your search ranking
Chat and social sharing
Messaging apps and feeds dislike large files, so shrink them first for smoother sending
E-commerce product shots
Marketplaces cap upload sizes; batch-slim them before listing to save time
ID and personal photos
Email attachments and forms often cap file size, so compression gets them under the limit
Email attachments
Compressed attachments are smaller, send more smoothly, and download faster for recipients
Mobile sharing
Phone photos are often too large; compress before sharing to save time and data
Which format should you pick
Match the format to the job and you get both size and quality
JPG
Best for photos and smooth gradients
Lossy and small, but no transparency support.
PNG
Use it when you need transparency or crisp lines
Lossless and faithful, but usually larger.
WebP
Pick it when you want the smallest file
Balances quality and size, supported by all modern browsers.
How the compression works
Built on native browser APIs — no network needed
Lossy compression: JPG and WebP drop redundant detail you barely notice, shrinking the file a lot.
Lossless keep: choosing PNG keeps every pixel, good for transparency and line art, but savings are limited.
Switch to WebP: at the same quality, WebP is usually 30%–70% smaller than JPG/PNG, making it the top pick for size.
Smart fallback: if a file would grow after compressing (say an already-tiny PNG), the original is kept as-is.
Image compression FAQ
Answers to common questions about compression, formats, and usage
Is this image compressor really free? Any limit?
Can I compress images in batch? How?
Are my images uploaded to a server during compression?
Which image formats are supported?
Will quality drop after compression?
Does it work on mobile?
How much can it shrink an image?
Why does the file sometimes get larger after compression?
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