Answers, engineered with clarity.

IMGcon is a free, client-side image optimization tool that compresses, resizes and converts images directly in your browser — no uploads, no server processing, no waiting.

Built on the HTML5 Canvas API, every transformation runs instantly on your device. Whether you are a developer preparing production assets, a designer exporting web graphics or simply someone who needs a quick conversion — IMGcon delivers professional results in seconds.

IMGcon uses the HTML5 Canvas API to decode your images, apply your chosen settings and re-encode them into the target format. The entire pipeline stays in your browser’s memory:

1. 1

   Decode

   Your image is read into an in-memory canvas using native browser decoders.

2. 2

   Transform

   Quality, dimensions, crop and watermark are applied via canvas operations.

3. 3

   Encode

   The result is compressed into your chosen format — WebP, AVIF, JPEG or PNG.

4. 4

   Download

   The optimized file is offered as a direct download — or batched into a ZIP.

Getting started takes just three steps:

No sign-up required. No watermarks on output. Start optimizing immediately.

Because all processing happens on your device, there are no server costs to offset. That means:

• No usage caps
• No registration required
• No data collection
• No premium tier — everything is included

Built as a passion project for the developer community. If you find it valuable, consider starring the repository or sharing it with colleagues — feedback and bug reports are always welcome.

Use IMGcon to optimize images for any purpose — no sign-up, no license key, no restrictions. The images you produce are yours, with no claim attached.

IMGcon supports a wide range of input and output formats:

Paste images directly from your clipboard — it works with screenshots and copied images from any application.

The quality slider controls the compression level for lossy formats (WebP, AVIF, JPEG). Here is what the ranges mean in practice:

Absolutely. IMGcon is built for batch workflows — up to 30 files per batch:

• Drag & drop multiple files
• Shift/Cmd+click in the file browser
• Paste multiple screenshots in sequence
• Up to 30 images per batch

All images use the same configuration (format, quality, dimensions). Download individual files or use Download Archive to get everything as a single ZIP.

Presets save your favourite configuration — format, quality, dimensions, crop, naming and watermark — for one-click recall across sessions.

Presets are stored in your browser’s localStorage — they persist across sessions but stay on your device. System presets for OpenGraph banners, Instagram posts, hero headers and avatars are included out of the box.

Yes — paste works everywhere. Copy an image in any application, switch to IMGcon and press Ctrl/Cmd + V.

Clipboard contents are read locally by your browser — nothing is transmitted.

Yes. IMGcon includes a built-in text watermark engine with full control over placement and opacity:

Crop modes cut the source image to a target aspect ratio from its center; max dimensions then scale the result down to fit.

Yes — the File Naming field supports variables that are expanded for every optimized file:

Example: {name}-og.{ext} turns photo.png into photo-og.webp.

IMGcon operates entirely within your browser. Images are loaded into memory via the Canvas API, processed locally and offered as a direct download. No image data is ever transmitted to any server — not even for format conversion.

The only network request is to our stats API — which sends anonymized aggregate counters (total images processed, total bytes saved), never the images themselves.

All EXIF metadata (Exchangeable Image File Format) is automatically and permanently stripped during re-encoding. This includes:

This is a fundamental property of the Canvas re-encoding pipeline — not an optional feature. Your privacy is guaranteed by the browser’s architecture itself.

The global counter tracks exactly two aggregate numbers:

No personal data, no IP storage, no per-user profiles. The counters are anonymous by design and are rate-limited per session. Reporting is optional in spirit — the request fires after processing and never contains image data.

IMGcon sets exactly one strictly necessary session cookie — and it has a single job: protecting the stats endpoint against cross-site request forgery (CSRF).

Your theme and presets are stored in localStorage and never leave the device.

IMGcon accepts files up to 25 MB per image. Beyond that, performance depends on your device’s RAM:

IMGcon works in all modern browsers that support the HTML5 Canvas API and OffscreenCanvas:

Not sure? Just try it — IMGcon reports unsupported browsers gracefully with clear guidance.

Once the page has loaded, most core functionality works without an internet connection:

Only the global stats counter requires connectivity to report your usage — optimizing, downloading and ZIP export all function perfectly offline.

Animated images such as GIF or animated WebP can be opened, but IMGcon currently exports static images — the Canvas pipeline re-encodes a single still frame (typically the first frame of the animation).

IMGcon encodes AVIF through the browser’s native canvas.toBlob() support. If your browser cannot produce AVIF:

• The affected file is reported with a clear error message
• All other formats (WebP, JPEG, PNG) continue to work normally
• Switch the output format to WebP — visually comparable and universally supported

All current versions of Chrome, Firefox, Edge and Safari ship with AVIF encoding enabled by default.

Yes — the interface is fully responsive and the processing pipeline works on iOS and Android in all modern browsers.

Very large images (100 MP+) may be memory-constrained on older phones — use the max-dimension inputs to downscale first.

IMGcon’s backend is deliberately minimal. The only HTTP endpoint is the anonymous stats API (GET/POST /api/stats) that powers the global counters.

If you need server-side batch processing, consider a dedicated pipeline such as sharp (Node.js) or ImageMagick.