PixStack

Free Online Image Optimizer

Smart compression with WebP/AVIF conversion. Up to 80% smaller files — free, privacy‑first, and watermark‑free.

Drop your images here

or click to browse files

Max 5MB per file • Up to 1 images per upload

🧠 Smart mode active: We'll automatically choose WebP or AVIF format and optimize quality settings for your images.

All processing local + server-side transient, no files stored.

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Feedback & Issues

Have an idea or spotted something off?

Send feedback or a bug report — every note helps us improve.

HOW TO OPTIMIZE

UPLOAD IMAGES

Drag & drop your images or click to browse. Works on desktop and mobile—no signup or watermark.

AUTO‑OPTIMIZE

Smart mode picks WebP/AVIF and tunes quality for the smallest size while preserving visual fidelity.

DOWNLOAD

Download individual results or a ZIP. Switch to Manual to choose format and quality yourself.

TIP

Need to change format for many files? Use batch mode to apply the same settings to all uploads for consistent results.

WHY OPTIMIZE IMAGES?

Optimized images make your site feel instant. Fewer bytes means faster page loads, better Core Web Vitals, and higher conversions.

Smart mode picks WebP/AVIF automatically and tunes quality for maximum savings without visible loss.

Manual mode gives you full control over format, quality, and metadata for pixel‑perfect results.

Use AVIF for the smallest files when supported; use WebP for broad modern support; keep PNG for transparency and JPEG for legacy.

MAKE YOUR SITE FASTER — AND RANK HIGHER

LIGHTER PAGES
Up to 80% smaller images reduce bandwidth and speed up every page view.
BETTER VITALS
Improve LCP and overall Core Web Vitals with smaller, modern formats.
PRIVACY‑FIRST
No watermarks. Files are processed and immediately deleted.
Use Smart mode for zero‑config results; switch to Manual for strict control.

PRO TIPS FOR OPTIMIZING

  • WebP: start at 75–85% quality. AVIF: 60–80% is often enough due to better compression.
  • Need transparency? Prefer PNG or WebP (lossless). JPG doesn’t support alpha and will flatten.
  • For crisp UI/text, keep PNG or WebP lossless. For photos, use WebP/AVIF lossy.
  • Strip metadata for smaller files unless you need EXIF/ICC.

QUALITY VS SIZE GUIDE

Interactive demo: See how quality affects file size in real-time

DEMO QUALITY75%

SAMPLE: 2MB PHOTO

WEBP
1.04 MB
-48%
JPEG
1.18 MB
-41%
AVIF
798.1 KB
-61%
PNG
2.00 MB
No savings

QUALITY RECOMMENDATIONS

90-100%PRINT QUALITY

Professional printing • Archival • Large files

75-89%HIGH QUALITY

Portfolio • Social media • Good balance

60-74%WEB OPTIMIZED

Websites • Fast loading • Recommended

10-59%MAXIMUM COMPRESSION

Thumbnails • Previews • Visible quality loss

OPTIMIZATION TIPS

• PHOTOS WITH PEOPLE
Use 70-85% quality to preserve skin tones
• LANDSCAPES
Can use 60-75% quality without noticeable loss
• TEXT IN IMAGES
Use 80%+ quality to maintain readability
• GRAPHICS/LOGOS
Consider PNG for sharp edges and text

FREQUENTLY ASKED QUESTIONS

RELATED TOOLS

You are using: OPTIMIZE

WORKFLOW SUGGESTIONS

• OPTIMIZE (smart all-in-one solution)
• RESIZE → OPTIMIZE (dimension + compression)
• CROP → OPTIMIZE (focus area + smart conversion)
• CONVERT → COMPRESS (manual control workflow)
Free Online Image Optimizer | PixStack