Batch Image Converter & Compressor
Convert, compress, resize, watermark, crop, and strip metadata from multiple images at once.
Drag & drop your images here
or browse files from your computer
Ad placeholder slot
Vertical Sidebar (300x600)
Ad placeholder slot
Medium Rectangle (300x250)
Offline Client-Side Image Processing Engine: Parallelism & Optimization
img-converter.in processes your files completely inside your web browser. No files are uploaded to any server. Utilizing next-generation HTML5 Canvas operations, async Web Workers, and local memory pipelines, you get instant format conversions and size compressions while retaining 100% data privacy.
| Image Format | Best For | Compression Type | Transparency |
|---|---|---|---|
| WebP | Modern web applications, speed optimization | Lossless & Lossy (Superb ratio) | Yes |
| PNG | Logos, line art, high contrast overlays | Lossless (Larger file sizes) | Yes |
| JPEG / JPG | Complex photography, general uploads | Lossy (Highly adjustable) | No |
1. Web Workers & Browser Main Thread Bypass
Processing multiple image buffers simultaneously in javascript can easily lock up the browser's UI thread, causing sluggish hover effects or frozen click behaviors.
To solve this, our batch engine allocates operations asynchronously. Heavy image loading, scaling computations, and output compression are pushed to the browser's underlying graphic compositing threads, keeping your UI fluid.
2. Binary Search Iterations for Target KB Limits
When you specify a target file size (e.g., 200KB limit), a single compression call is rarely accurate due to varying photo complexity.
Our optimizer uses a **Binary Search Algorithm** that iteratively adjusts the output quality factor $Q$ and dimension scale $S$. Within 4 to 6 rapid render sweeps in memory, the engine converges on the highest quality parameters that fit under your exact threshold size:
Browser Garbage Collection & Memory Mitigation
Batch processing dozen-gigabyte photo archives directly in the browser cache requires strict memory sanitation. Without optimization, browser memory limits would trigger crash pages. We prevent memory leaks using three pillars:
- URL Revocations: When you discard a processed batch, our script invokes `URL.revokeObjectURL(url)` to immediately release the stored blob pointers from internal browser memory.
- Canvas Dimensions Cleared: Setting `canvas.width = 0` and `canvas.height = 0` forces modern browser engines to immediately collect the large pixel buffers from heap memory.
- Garbage Collection Friendly Buffers: All file readers use local variable scopes, ensuring memory allocations are clean, isolated, and rapidly reclaimed.
Frequently Asked Questions
How does offline browser compression keep images private?
img-converter.in operates solely via JavaScript APIs within your local browser sandbox. Standard online converters transfer files to distant backend servers to process them, risking privacy. img-converter.in uses Canvas memory structures, so files never travel over the network.
Can I compress images to exactly 100 KB or 200 KB?
Yes, using our Target Size compression loop, the converter dynamically calculates quality variables and scale sizes to automatically match or fall just below your specified limit, bypassing guess-work sliders.
Are EXIF metadata parameters stripped?
Yes. By default, drawing and reading pixel coordinates on an HTML5 canvas discards internal metadata header chunks (containing GPS tags, cameras, timestamps). This acts as a native EXIF stripper.