이미지 압축기
이미지 도구 · 무료 온라인 도구
품질 슬라이더로 JPEG/WebP 이미지 압축.
이미지 압축기 사용 방법
- 1Upload your image file or drag and drop it into the tool.
- 2Adjust the tool-specific settings (quality, size, format, etc.).
- 3Click the process button to apply changes.
- 4Download the processed image.
주요 기능
- ✓100% 무료 — 가입, 구독, 광고 없음
- ✓브라우저에서만 실행 — 데이터는 기기를 떠나지 않습니다
- ✓빠르고 가벼움 — 즉시 결과 확인
- ✓크로스 플랫폼 — 데스크톱, 태블릿, 모바일 지원
이미지 압축기 소개
Image compression reduces image file size while maintaining acceptable visual quality. Lossy compression (JPEG, WebP) discards data permanently; lossless compression (PNG) preserves all data. Modern web performance requires optimized images — uncompressed images are the #1 cause of slow page loads.
이미지 압축기 작동 원리
JPEG uses Discrete Cosine Transform (DCT) to discard high-frequency visual data. WebP uses VP8 intra-frame encoding with better compression. The browser's Canvas API decodes the image, re-encodes it at a chosen quality level (0-1), and outputs a compressed Blob. Higher quality = larger file; lower quality = artifacts.
주요 활용 사례
- ✓Web performance — reduce LCP (Largest Contentful Paint) time
- ✓E-commerce — faster product image loading increases conversions
- ✓Email attachments — fit images within size limits
- ✓Storage savings — reduce cloud storage costs for user uploads
JPEG vs WebP vs PNG
JPEG: lossy, best for photos, no transparency. WebP: lossy or lossless, smaller than JPEG, supports transparency, 97% browser support. PNG: lossless, supports transparency, larger files, best for graphics/screenshots. For web photos use WebP with JPEG fallback; for graphics use PNG or SVG.
보안 및 개인정보
This tool processes images entirely in your browser using the Canvas API — your images are NEVER uploaded to any server. This is critical for sensitive images (medical, legal, personal). Server-based compressors see your images; browser-based ones cannot.
기술 세부 정보
JPEG: DCT-based, quality 1-100, no alpha channel, baseline/progressive. WebP: VP8-based, 25-35% smaller than JPEG at equivalent quality, supports alpha. PNG: DEFLATE compression, lossless, supports 8/16-bit per channel. Canvas API: toBlob() with quality parameter for JPEG/WebP. EXIF metadata is stripped during re-encoding.
자주 묻는 질문
What quality level should I use?
For web photos: 75-85 (good balance). For thumbnails: 60-70. For high-quality displays: 90-95. Below 50 shows visible artifacts. WebP at 80 usually matches JPEG at 90 with smaller size.
Does compression affect image dimensions?
No. Compression reduces file size, not pixel dimensions. To resize, use a separate image resize tool. Compression only changes quality and encoding efficiency.
Is my image uploaded to a server?
No. This tool uses the browser's Canvas API — all processing happens locally. Your images never leave your device. This is safer than server-based compressors.
관련 도구
개념 배우기
개념 배우기
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