Image Compressor + Converter
Compress JPG, PNG and WebP images, convert formats, and hit an exact file size — 100% free, no signup, files never leave your device.
Image Compressor + Converter
Compress JPG, PNG and WebP images, convert formats, and hit an exact file size — 100% free, no signup, files never leave your device.
Drop your images here — JPG, PNG, WebP supported
Drag and drop one or multiple images, or click Choose Images. All previews and processing run 100% locally on your machine.
Visual Comparison
Original vs Compressed QualityWhy In-Browser Image Optimization Matters
What It Does: Ninomax Image Compressor + Converter is a client-side web utility that lets you compress JPG, PNG, and WebP images, convert between formats, and scale to exact pixel dimensions directly inside your browser. With support for drag-and-drop batch processing, visual before-and-after comparison, and precision binary-search quality tuning, you can optimize dozens of photos in seconds with zero latency.
Speed & SEO Impact: Uncompressed images are the leading cause of sluggish page load times, excessive data usage, and poor Google Core Web Vitals (specifically Largest Contentful Paint — LCP). Converting bulky assets to lightweight WebP or calibrated JPGs slashes payload weight by 30% to 90%, speeding up first-contentful rendering, reducing bounce rates, and boosting search engine ranking signals across desktop and mobile devices.
Free & Permanently Private: Unlike cloud-based converters that transmit your sensitive personal photos or corporate graphics to remote servers, all image decoding, canvas operations, and compression algorithms execute strictly inside your local browser thread. Your files never touch a server, no account is required, no watermarks are added, and there are no file size paywalls.
100% Private Memory Sandbox
Zero network requests, zero telemetry, and zero cloud storage. Your images stay on your device throughout the entire upload, compression, and download lifecycle.
Modern WebP & JPG Conversion
Convert legacy PNGs and massive photos to Google's modern WebP format for optimal compression, or convert to JPG with automated clean white background rendering.
Binary Search Target Size Engine
Need a file under 50 KB or 100 KB for a government document, visa portal, or job application? Our iterative binary search finds the optimal quality ≤ your target byte limit.
One-Click Workflow Presets
Instantly auto-configure dimensions and formats for Passport Photos (35×45 mm), Govt Forms, Job Portals, Facebook Posts, YouTube Thumbnails, and Instagram Squares.
Common Questions About Image Optimization
Is it really free?
Yes, Ninomax Image Compressor + Converter is 100% free with no hidden paywalls, no subscription tiers, and no watermarks. You can compress, resize, and convert as many images as you need without signing up, entering an email address, or installing software.
Are my photos uploaded?
No. Your photos are never uploaded to any remote server, cloud API, or external database. All decoding, compression, resizing, and format conversions execute locally inside your browser's private memory thread using the HTML5 Canvas API. Your files never leave your device.
What formats are supported?
The tool natively supports JPG/JPEG, PNG, and WebP for both input and output. You can compress existing files in their original format or cross-convert freely. Transparent backgrounds are preserved in PNG and WebP, and cleanly rendered with a solid white background in JPG to eliminate black border artifacts.
How to make a photo exactly 50 KB for a form?
To make a photo hit an exact 50 KB limit for government portals, job applications, or university forms, either click the one-click "Govt Form" preset or switch the compression mode to "By Target Size" and enter 50 in the KB input. Our iterative binary-search algorithm tests multiple quality calibrations in memory to deliver the highest possible image clarity that stays strictly within your 50 KB budget.
Technical Boundaries & Best Practices
- Client-Side File Limit: The upload engine enforces a 20 MB limit per image to safeguard your browser memory and ensure fluid responsiveness during batch operations.
- No Upscaling by Default: The dimensions engine maintains natural aspect ratios and guards against upscaling smaller images beyond their original resolution to prevent pixel distortion.
- Batch ZIP Export: Multi-image batches are packaged on-demand as a single ZIP archive, with automatic fallback to sequential individual downloads if offline.