About this tool
Free Online Image Compressor, Reduce File Size Without Losing Quality
OmegaPix compresses JPEG, PNG, and WebP images directly in your browser using professional-grade WebAssembly codecs. No uploads, no account, and no artificial file size limits. Smaller images load faster, cost less in CDN bandwidth, and improve Core Web Vitals scores. All with a privacy guarantee that your files never leave your device.
Why use OmegaPix
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No upload = no privacy risk : Your images are processed entirely inside your browser. Nothing is sent to a server. This matters for confidential documents, personal photos, and client assets.
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Professional mozjpeg + libwebp codecs : OmegaPix uses the same encoders that Google and major CDNs use internally. Results are measurably better than browser-native compression.
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Batch compress with ZIP download : Drop an entire folder of images at once. Compress all of them and download the results as a single ZIP, no repeated manual steps.
How it works
Add your images
Drag images onto the drop zone or click to browse. Batch processing lets you compress dozens of files at once without re-uploading.
Select quality mode
Auto quality finds the optimal compression level for each image individually. Switch to Manual and drag the quality slider between 10 and 100 for precise control.
Download compressed images
Each compressed file shows its new size and the percentage saved. Download files individually or export all at once as a ZIP archive.
Frequently asked questions
How much can OmegaPix reduce image file size?
Results vary by content and starting format. Typical reductions are 30–70 % for JPEG and 40–80 % for PNG when converting to WebP with Auto quality. Compressing within the same format, JPEG to JPEG, usually achieves 20–50 % savings.
Does image compression affect visible quality?
With Auto quality, OmegaPix targets a compression level where visual degradation is not perceptible to most viewers. If you need maximum fidelity, set Manual quality to 85–95 to guarantee minimal loss.
Can I compress PNG images without losing transparency?
Yes. PNG and WebP both support alpha transparency. OmegaPix preserves transparency when compressing PNG files or converting PNG to WebP or AVIF.
What is the best format for web images?
WebP is the best all-round format for the web, better compression than JPEG and PNG, with full transparency support. AVIF is even smaller but heavier to encode and decode, which can slow older devices. For maximum compatibility, WebP is the practical choice.
Can I compress a batch of images at once?
Yes. Drop as many files as your device memory allows. OmegaPix processes them concurrently using Web Workers, then lets you download each result or export all as a ZIP.
Are my images private when using this online compressor?
Completely private. OmegaPix runs the entire compression pipeline inside your browser. Your images never reach a server, not even for a fraction of a second.
Does compressing images improve Google PageSpeed scores?
Yes. Image weight is one of the largest contributors to poor Lighthouse and PageSpeed Insights scores. Reducing image file sizes directly improves Largest Contentful Paint (LCP), the Core Web Vitals metric Google uses as a ranking signal.
Should I compress to WebP or keep JPEG for social media?
For social media uploads, JPEG is often safer because platforms re-encode images anyway and WebP support varies by app. For your own website, always prefer WebP. It loads faster and looks the same to viewers. OmegaPix lets you choose per-file, so you can prepare both formats in a single batch.
Does OmegaPix strip EXIF metadata?
Yes, by default. Stripping EXIF removes GPS coordinates, camera model, and other embedded metadata, which produces smaller files and protects your privacy. If you need EXIF preserved, keep the originals before compressing.
When should I not compress images?
Avoid compressing images that will be re-edited later, start from the original instead. JPEG re-compression compounds quality loss with each pass. For print use, keep files at maximum quality and only compress the web-specific export.
When to use this tool
Web performance optimization
Reduce image weight before deploying to production. Typical savings of 40–70 % directly improve Largest Contentful Paint (LCP) and reduce bandwidth costs.
Email and presentation assets
Compress images to meet email attachment limits or reduce slide deck file sizes without visibly degrading the graphics.
Client delivery and archiving
Prepare compressed versions of deliverables for clients who need web-ready exports, while keeping originals safe in your local archive.
When not to use this tool
Re-editing later
JPEG re-compression compounds. Each pass loses detail. Keep the originals; compress only the export.
Print at large sizes
Print needs 300 DPI uncompressed. Web compression strips data your printer would otherwise use.
Lossless archives
Family photo archives or legal evidence should stay as original RAW / JPEG. Compress only the working copy.
Technical details
Real numbers, not promises
A 4032×3024 iPhone JPEG at quality 100 is typically 4.2 MB. Recompressed to quality 85, it drops to 1.8 MB, a 57% reduction with no detectable quality change at normal viewing distance. At quality 80, 1.1 MB (-74%). Going further to quality 60 reaches 580 KB (-86%) but introduces visible artefacts on close inspection.
Auto vs Manual quality
Auto mode targets perceptual quality 85 on JPEG, 80 on WebP, and 60 on AVIF. The visually-lossless sweet spot for each format. Manual mode lets you push lower (to hit an email cap, for example) or higher (when re-encoding is the only option but quality matters more than size). The slider runs 10-100 with safe defaults pre-selected per format.
Browser and device compatibility
OmegaPix uses WebAssembly codecs that run in Chrome 89+, Firefox 89+, Safari 15.2+, and Edge 89+, covering 96%+ of global browser traffic. Mobile browsers work too; processing is slower on phones due to limited CPU and RAM, but typical batches under 50 images complete in seconds. Files larger than 50 MB per image on desktop (25 MB on mobile) hit the memory guard.
Format choice for the web
For new web content in 2026: serve AVIF as primary (50% smaller than JPEG), WebP as fallback for the handful of browsers without AVIF (1.5% of traffic), JPEG only if you support pre-2018 browsers. For email, sharing, and archival, JPEG remains the universal default.
Your files stay on your device
Image compression runs entirely in your browser via WebAssembly. The same encoders Google and Netflix use, executing locally. No upload, no temporary copy on a server, no log entry mentioning your file. You can verify by opening DevTools → Network and watching the Compress action: zero outgoing requests carrying image bytes.