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Free Image Compressor Online

Reduce JPG, PNG, and WebP file sizes instantly. See before & after size comparison live - No signup, no watermarks.

Drop your image here

JPG, PNG, WEBP - Up to 20 MB

Size Comparison
Original
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Compressed
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File size reduction -
Image preview

Compressing…

Compression Settings
Output Format
Same
Keep original format
JPG
Best for photos
WebP
Smallest file size
PNG
Lossless quality
Quality 75
SmallestBalancedBest
Estimated output -
Estimated saving -

How Image Compression Works

Image compression reduces file size by encoding pixel data more efficiently. Lossy compression (JPEG, WebP) permanently removes imperceptible detail - Smooth color transitions are approximated, fine textures are smoothed - Achieving dramatic size reductions (50–90%) with minimal visible impact at quality settings of 75+. Lossless compression (PNG, WebP lossless) finds patterns and repetition in the data and encodes them as references rather than raw values, achieving 10–40% reduction with zero quality loss.

This tool uses Pillow's production-grade compression pipeline on the server side: progressive JPEG encoding, WebP's method-4 speed/quality balance, and optimised PNG deflate - The same stack used by major image CDNs.

JPEG vs WebP vs PNG - Compression Comparison

FormatTypeCompressionTransparencyBest For
JPEG Lossy High No Photos, product images
WebP Lossy / Lossless Highest Yes Web use, all image types
PNG Lossless Moderate Yes Logos, screenshots, UI
AVIF Lossy / Lossless Best Yes Next-gen web images

What Quality Setting Should I Use?

For photos shared on social media or the web, quality 75–80 delivers a good balance - Typically 50–70% smaller than the original with no visible degradation. For assets on your own website where you control the viewer's display, quality 60–70 often reduces file size by 75–85% with only minor softness visible on close inspection. Never go below 50 unless file size is critical and quality is secondary.

Frequently Asked Questions

How much can you compress an image without losing quality?
For JPEG and WebP, quality settings between 75–85 typically achieve 40–70% file size reduction with no perceptible quality loss. Below 60, compression artefacts become visible. PNG uses lossless compression, so the quality slider affects compression speed rather than image fidelity - The pixel data is always preserved exactly.
What is the difference between lossy and lossless compression?
Lossy compression (JPEG, WebP lossy) permanently removes some image data to achieve smaller files. The removed data is chosen to be least noticeable to human vision. Lossless compression (PNG, WebP lossless) rearranges data more efficiently without discarding any - The decompressed image is pixel-perfect identical to the original.
Which format produces the smallest file size?
WebP consistently produces 25–35% smaller files than JPEG at equivalent visual quality. AVIF is even smaller - Often 40–50% smaller than JPEG - But browser support is slightly less universal. For photos destined for the web, WebP is the safest high-compression choice today.
Does compressing reduce the image dimensions?
No. This tool only reduces file size through compression - Pixel dimensions stay the same. To change dimensions, use the Image Resizer.
Is my image stored on your servers?
No. Your image is only sent to our server when you click Download, to apply the selected format and quality settings. It is discarded immediately - Never stored, indexed, or shared.

Practical Image Compression Workflow

Use compression as the last publishing step. First make the image the right size and shape, then reduce the file without damaging the detail users actually need to see.

Start with the final dimensions
A practical web target is often under 200 KB for normal content images and under 500 KB for large hero images. For best results, resize the image to the display size, crop unused space, then compress the final file.
Choose the format by image type
Use JPEG for photographs, PNG for transparent graphics and screenshots with sharp text, and WebP for most website images. If a logo or interface screenshot has small lettering, compare PNG and WebP before choosing the smaller file.
Check the image where users will see it
Do not judge compression while zoomed far past the real display size. Product photos need clean edges, readable labels and natural color. Thumbnails can usually be compressed harder because users see them smaller.
Use different settings by placement
Keep ecommerce main images crisp and compress gallery thumbnails more aggressively. Blog images should match the content column. Email images should use modest dimensions so messages load quickly across clients.
Protect page speed and crawl efficiency
Large image files slow down rendering, especially on mobile connections. Compress repeated thumbnails, preview images and supporting graphics, not only the hero image. Lighter image assets help visitors reach the main content faster and make image-heavy pages easier to crawl.
Know when compression is not the fix
If the compressed image looks soft, do not keep raising the file size forever. Use the AI Image Enhancer when the source needs clarity, denoise or contrast cleanup. Compression should reduce delivery weight, not repair weak source quality.
Name files so teams use the right version
For image libraries, include the purpose, size and format in the filename. A name like product-card-800.webp is easier to reuse correctly than final-final-small-new.jpg, and it reduces the chance that someone uploads the heavy original by mistake.
Compare two exports before publishing
When quality matters, export one smaller version and one slightly higher-quality version, then compare them in the actual page layout. Pick the smallest file that still keeps faces, product edges, contrast, smooth color transitions and text looking clean.
Compress batches with the same rules
For product galleries, portfolios and blog archives, use consistent compression settings across similar images. A page feels more polished when thumbnails share similar sharpness, color depth and file weight instead of mixing crisp images with visibly degraded ones.
Keep a clean master file
Repeated exports can create blocky edges, color banding and fuzzy text. Keep one untouched original, create web-ready versions from that file, and use the AI Image tools hub when you need to move between resizing, cropping, enhancement and compression.