Is Image Shuttle free?

Yes, Image Shuttle is completely free with no hidden costs. All features can be used without limits and without creating an account.

Are my images uploaded to a server?

No. All processing in Image Shuttle happens locally in your browser using Canvas API, WebAssembly, and Web Workers. Your images never leave your device.

What image formats are supported?

Image Shuttle supports four major formats: JPEG, PNG, WebP, and AVIF. You can freely convert between these formats.

Will image quality decrease after compression?

It depends on the compression level you choose. With the 'High Quality' preset (85% quality), differences are nearly invisible to the naked eye. With 'Maximum Compression', there may be slight quality loss but significantly smaller file sizes. For PNG images, WebAssembly quantization is used — the quality preset maps proportionally to the quantizer target (85% maps to target 60, 70% to target 49, 50% to target 35).

How large can the images be?

Image Shuttle has no application-level size limit. The actual limit depends on your browser and device's available memory. Modern desktop browsers typically support images up to 16,384 × 16,384 pixels. If an image exceeds the browser's Canvas limit, processing will fail. For very large images, manually set maximum width/height to scale them down.

Why does PNG compression use WebAssembly?

PNG is a lossless format, and standard Canvas API compression has limited effectiveness. Image Shuttle uses libimagequant-wasm (a library compiled from a high-quality quantization algorithm to WebAssembly) for more efficient PNG compression, typically reducing file size by 50-80%. The quality preset maps proportionally to the quantizer's target value.

How many images can be processed simultaneously in batch mode?

Image Shuttle uses intelligent concurrency control, automatically adjusting the number of parallel processes based on your device's CPU cores (default: navigator.hardwareConcurrency). For example, an 8-core CPU can process 8 images simultaneously.

What are the advantages of WebP and AVIF formats?

WebP is 25-35% smaller than JPEG and 26% smaller than PNG, supporting transparency and animation. AVIF is a newer format, approximately 50% smaller than JPEG, supporting HDR and wider color gamuts. Both are recommended formats for modern web.

Can I resize an image to exact dimensions like 512×512?

Yes. In the Photo Editor, crop to the aspect ratio you need (e.g. 1:1), open Resize and type the target width (such as 512) — the height syncs automatically with the aspect-ratio lock. Apply and export to get exactly that size, with your choice of PNG/JPG/WebP format and compression quality.

What adjustments and filters does the Photo Editor support?

Adjustments cover brightness, contrast, saturation, hue, blur, sharpen, vignette and grain, plus grayscale/sepia/invert toggles — and 12 one-click filter presets (B&W, Noir, Vintage, Warm, Cool, Fade, Punch, Soft, Dramatic and more). You can also add text (9 font stacks including Chinese), 96 emoji stickers and 6 shape types, all draggable with full undo/redo.

What layouts does the Collage Maker support?

20 programmatic layouts are built in: regular grids (2×2 up to 4×2), feature-photo compositions and asymmetric mosaics, across 6 canvas ratios (1:1 to 9:16). Spacing, outer margin, corner radius and background color are all adjustable; photos can be panned and zoomed inside each cell, and the result exports at 2000px width.

Do custom canvas sizes in the Design Studio cost anything?

Completely free. Custom width/height from 64 to 4096 pixels, 8 social-media size presets (OG image, YouTube thumbnail, Instagram, Story and more), the layer system, gradient backgrounds and 10 starter templates cost nothing, and exports never carry a watermark — features many competitors paywall.

What's the difference between Image Shuttle and Squoosh?

Both process images locally in your browser, but they serve different needs: Squoosh is a single-image compression tool, while Image Shuttle is a full image studio — batch compression and format conversion plus a built-in photo editor (filters, text, exact-pixel resize), a collage maker and a design studio, with a bilingual UI and offline PWA support.

Image Shuttle 소개

ShuttleLab이 만든 무료 프라이빗 브라우저 기반 이미지 스튜디오 — 압축, 편집, 콜라주, 디자인

Image Shuttle이란?

Image Shuttle은 브라우저에서 완전히 실행되는 무료 온라인 이미지 스튜디오입니다. 압축기로 시작해 이제는 네 가지 도구를 하나로 모았습니다. JPEG, PNG, WebP, AVIF 압축·변환기, 조정·필터·자르기·정확한 픽셀 크기 조정이 되는 사진 편집기, 20가지 그리드 레이아웃을 갖춘 콜라주 메이커, 그리고 레이어·템플릿·자유로운 사용자 지정 캔버스 크기를 지원하는 디자인 스튜디오까지 담았습니다. 기존 온라인 도구와 달리 어떤 파일도 업로드되지 않습니다 — 모든 처리가 Canvas API, WebAssembly, Web Workers로 여러분의 기기에서 이루어집니다.

512×512 아바타가 필요하신가요? 1:1로 자르고 크기 조정에 512를 입력한 뒤 내보내면 — 원하는 포맷과 압축 품질로, 정확히 그 크기로 만들어집니다. 워터마크도, 계정 요구도 절대 없으며, 다른 도구가 유료화하는 사용자 지정 캔버스 크기도 여기서는 무료입니다. 웹용 이미지를 최적화하든, 스크린샷에 주석을 달든, 소셜 커버를 만들든, 사진을 그리드로 이어 붙이든, Image Shuttle은 개인정보 위험 없이 처리합니다.

100% 프라이빗

모든 이미지 처리가 브라우저 안에서 로컬로 이루어집니다. 파일이 업로드되지 않고, 데이터가 수집되지 않으며, 제3자가 이미지에 접근할 수 없습니다.

계정 불필요

바로 압축을 시작하세요 — 가입도, 이메일도, 추적도 없습니다. 이미지를 끌어다 놓으면 끝입니다.

오픈소스 정신

Image Shuttle은 AGPL-3.0 라이선스 오픈소스로, 최신 웹 표준을 기반으로 만들어졌으며 모든 처리를 클라이언트 측에서 수행합니다.

번개처럼 빠르게

병렬 처리를 위한 Web Workers와 PNG 최적화를 위한 WebAssembly를 활용해, Image Shuttle은 전문가급 압축을 네이티브 속도로 제공합니다.

When should I use Image Shuttle?

1WordPress post image optimization

Before: 5MB origin images, LCP > 4s, low Google PageSpeed score

After: Compressed to 800KB, LCP drops to 1.5s, PageSpeed score improves by 30+

2E-commerce product image batch processing

Before: 200 product images totaling 1.2GB, 30 minutes to upload to CDN

After: Compressed to 300MB total, upload time reduced to 8 minutes

3Email attachment image compression

Before: 3 photos totaling 15MB, exceeding email attachment limits

After: Compressed to 3MB, sent successfully with no visible quality difference

4Converting legacy PNG images to modern WebP format

Before: Website uses many PNG screenshots, slow page loads

After: Converted to WebP with 35% size reduction, noticeably faster loading

5Social media image preprocessing

Before: Phone photos are 8MB, slow Instagram upload with server-side compression

After: Pre-compressed to 1MB, fast upload with quality under your control

How-To Guides

How to compress a single image

1Open the Image Shuttle website (image.shuttlelab.org)
2Drag and drop your image onto the upload area, or click to select a file
3Choose a compression quality preset (High Quality 85%, Balanced 70%, or Maximum Compression 50%)
4Click the 'Apply' button to start compression
5Use the slider to compare original and compressed results, then download when satisfied

How to batch-compress multiple images

1Select multiple images in the upload area (supports drag-and-drop multi-select)
2Adjust compression settings (quality, format, size limits)
3Click 'Apply' — the system will automatically process all images in parallel
4Once processing is complete, click 'Download All' to download all compressed files at once

How to resize an image to exact dimensions (e.g. 512×512)

1Open the Photo Editor (image.shuttlelab.org/editor) and upload your image
2In Crop, pick the target aspect ratio (e.g. 1:1), drag the selection to frame the image, then apply
3Open Resize and type the target width 512 — the height syncs automatically via the aspect-ratio lock
4After applying, the bottom status bar shows the output size (512 × 512 px)
5Click Download, choose PNG/JPG/WebP format and compression quality, and export

How to convert image format

1Upload the image you want to convert
2Select the target format in the format selector (JPEG, PNG, WebP, or AVIF)
3Adjust quality parameters as needed
4Click 'Apply' and download the converted file

Image Shuttle vs Similar Tools (as of 2026-05)

Feature	Image Shuttle	TinyPNG	Squoosh
100% Local Processing	✓	✗	✓
No Registration Required	✓	✗	✓
Batch Processing	✓	Paid	✗
Format Conversion	✓	✗	✓
WebP/AVIF Support	✓	✗	✓
WebAssembly PNG Compression	✓	✗	✗
Real-time Preview Comparison	✓	✗	✓
Photo Editing (filters/text/exact resize)	✓	✗	✗
Collage Maker & Design Studio	✓	✗	✗
Completely Free	✓	Free tier limited	✓

Frequently Asked Questions

처음 만났는데도 오랜 벗이 돌아온 듯한 반가움

Image Shuttle은 ShuttleLab이 정성껏 만든, 완전히 무료이며 오픈소스인 서비스입니다. 단 한 장이라도 이미지를 압축하는 데 도움이 되었다면, 필요한 친구에게 알려주시는 것이 저희에게 가장 큰 응원입니다.

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질문, 피드백이 있거나 도움이 필요하신가요?

support@shuttlelab.org