Compress Image Online: Compress JPG, PNG & WebP (Free & Private)
Compress and optimize image file sizes up to 80% with visual quality sliders and zero file uploads.
Batch Multi-Image Compressor & Optimizer
Compress single or multiple JPG, PNG, and WebP images simultaneously with zero server uploads.
Supports multi-image batch selection • Fast HTML5 Canvas engine
What this tool does and who it is for
This compressor shrinks JPG, PNG and WebP files by re-encoding them in your browser. You choose the output format, a quality percentage and an optional maximum width, then download each file or a ZIP of the whole batch. It suits anyone trying to get photos under an upload limit or make a page load faster.
Most of the savings come from two levers. Lowering quality trades invisible detail for smaller files, and capping the longest side stops a 6000-pixel camera original from being served to a phone. Try the width cap first. A 4000-pixel photo shown at 800 pixels wide wastes most of its bytes.
Start around 75 percent quality and compare the preview against the original before you commit. Photos tolerate heavy compression. Screenshots with small text and flat color usually do not, and they look better as PNG or high-quality WebP.
Official Formula / Technical Standard
Real-World Worked Scenario
A 3.4 MB uncompressed smartphone camera photo (4032x3024) compressed at 80% JPEG quality reduces to 480 KB (an 86% size reduction) with virtually no perceptible loss of clarity on desktop displays.
When people use it
Product photos for Etsy or Shopify
Phone shots often weigh 4 to 8 MB each. Cap them at 1920px and export WebP or JPEG so a listing with ten images does not drag on mobile connections.
Email and job application attachments
Portal forms and email gateways often reject large attachments. Compressing a scan or photo before attaching it avoids bounced messages.
Blog and landing page images
Hero images are the usual cause of a slow Largest Contentful Paint. Resize to the real display width, then compress, before uploading to your CMS.
Batch cleanup of a photo folder
Drop in a dozen files, apply one setting to all, and pull the results down as a single ZIP instead of saving them one by one.
Notes for US users
- Many US job sites, school portals and government forms cap uploads at 2 MB or 5 MB. Check the stated limit, then aim comfortably below it.
- Shopify and Etsy recommend large, crisp listing photos. Compress lightly for the main product image and harder for secondary shots.
- WebP now loads in every current major browser, including Safari. Very old email clients and some print services still want JPEG, so keep a JPEG copy for those.
- Screenshots of tax forms or receipts are better kept as PNG. JPEG artifacts around small digits can make numbers harder to read.
Limits and what to double-check
- •Quality settings only affect JPEG and WebP. PNG output is lossless, so the quality slider will not shrink it much. The width cap is what helps there.
- •Re-compressing an already compressed JPEG adds a second round of loss. Keep your original and compress from that, not from the last output.
- •Metadata such as EXIF location and camera data is not carried through the canvas re-encode, which is often what you want, but do not rely on it as a formal privacy scrub.
Expert Best Practices & Common Pitfalls
Recommended Best Practices
- •Aim to keep web hero images under 200 KB and standard content images under 100 KB for optimal Core Web Vitals.
- •Convert legacy PNG and JPEG graphics to modern WebP format for 25% to 35% smaller file sizes at identical visual fidelity.
- •Resize image dimensions to their maximum rendered display width (e.g. 1920px for desktop) before compressing.
Common Mistakes to Avoid
- •Using uncompressed high-resolution camera RAW or PNG images directly on web pages.
- •Over-compressing images below 60% quality, which introduces visible banding, blurriness, and artifacting.
- •Serving full-width 4K resolution images to mobile smartphone viewports.
Features & Security Architecture
- 100% Client-Side: Zero server uploads ensure complete privacy and data confidentiality
- Fast Results: Processing happens on your own device, so there is no upload or server queue to wait for
- No Sign-Up Required: Completely free to use with no daily usage caps or account requirements
- Works on All Devices: Fully responsive across desktop, tablet, and mobile browsers
Frequently Asked Questions
What is the difference between lossy and lossless image compression?▼
Lossless compression reduces file size by optimizing how pixel data is stored without discarding any visual information (ideal for logos and line art). Lossy compression selectively discards imperceptible visual data to achieve dramatic size reductions (ideal for photographs).
Are my uploaded photos sent to any server?▼
No. All image reading, resizing, and canvas compression happens locally in your device's memory. Your photos never leave your computer or phone.
What quality percentage should I pick for web photos?▼
For ordinary photographs, 70 to 80 percent is a sensible range. Differences from the original are rarely visible at normal viewing size, while file size drops sharply. Go higher for images with fine gradients, such as skies or skin tones, and always zoom the preview before downloading.
Why did my PNG barely get smaller?▼
PNG is lossless, so the quality slider has little to work with. Either switch the output to WebP or JPEG if the image has no transparency, or use the maximum width setting to reduce pixel count, which cuts size far more than any PNG setting.
Can I compress many images in one go?▼
Yes. Add several files, set the format, quality and width once, and each is processed with the same settings. A Download All option bundles the results into one ZIP so you are not saving files individually.
Will compression remove the photo's location data?▼
The tool redraws the image onto a canvas and encodes a fresh file, so EXIF fields like GPS coordinates are normally not copied across. Treat that as a side effect, not a guarantee, and check the result with a metadata viewer if privacy matters.