Online Image Compression – Free JPG/PNG/WebP Compressor

Online Image Compression Tool (Client-side)

Reduce image file sizes in one click — free, fast, and privacy-safe. All processing is done locally in your browser; no files are uploaded.

Compression represents the same information using fewer bits.
Lossless compression: removes redundant information, smaller size, no quality loss.
Lossy compression: removes less important information, much smaller size with minimal visible impact.

Client-side automatic optimization: lossy compression done locally, balancing detail and file size.
Uses higher compression ratios by default, works well for photos and web images.
Only "Export Format" setting exposed; all other parameters are automatically optimized.
Live comparison slider to see before/after differences with fixed image positions for clarity.
Multi-threaded Web Worker processing for smooth batch compression; view progress and cancel anytime.

100% client-side processing, no server uploads, no data stored

Upload many images at once (for very large batches, process in groups for stability)

Auto (WebP recommended), JPEG, PNG — choose the format you need

Slider comparison of before/after with fixed alignment for clarity

View compression progress and cancel current tasks anytime

Not satisfied? Quickly re-compress or switch export format and try again

Upload Images: Drag & drop onto the page or click to select; supports mixed formats.
Compress Images: Click "Compress All" or compress individual images.
View Results: Drag the comparison slider to see before/after differences.
Download Results: Select "Download All" to save each image in sequence, or download individually.
Continue Working: Click "Clear" to start a new batch; to change format, select export format first then compress.

Input: JPG/JPEG, PNG, WebP.
Export: WebP (recommended: smaller size, supports transparency), JPEG (universal, no transparency), PNG (preserves transparency, larger size).
Transparency Note: Exporting as JPEG removes transparent backgrounds; use PNG or WebP to preserve transparency.

Will quality decrease? Our default strategy aims for "nearly imperceptible" balance between quality and file size.
Is there a limit? No hard limit set by the tool, but browsers have memory constraints; process very large batches in groups.
Is my data safe? 100% local processing, nothing uploaded to servers, no data collected.
Why recommend "Auto (WebP)"? WebP offers smaller file sizes at the same visual quality — better for web and sharing.

Websites & Blogs: Prefer WebP; keep JPEG for older environments.
Transparent Icons & UI: Use WebP or PNG (preserves transparency).
Social Media: JPEG works well and is smaller; platforms usually re-compress anyway.
Print & High Fidelity: For maximum quality, keep originals or export high-quality PNG/WebP.