Batch · Color Depth Control · Transparency Preserved · Zero Upload

PNG Optimizer

Optimize PNG images to reduce file size while maintaining transparency and high image quality for websites and applications.

Batch Processing Color Depth Reduction Transparency Preserved Per-File Savings Download All as ZIP
png-optimizer · batch · lossless · browser-native

Drop your PNG images here

Optimize PNG images to reduce file size while maintaining transparency and high image quality for websites and applications.

PNG · batch supported · transparency safe
Optimization Settings
Color Depth Full color
Scale Original size
100%
Images queued 0 files
Loading images…
Loading image data
Reducing color depth
Applying scale & transforms
Calculating savings
Optimized Images 0 files
Files: —
Original: —
Optimized: —
Total saved: —
Average reduction: —
Quick Guide

How to Optimize PNG Images

Four steps. Batch-ready. Transparency preserved.

01
Upload PNG Files
Drag & drop one or more PNG images or click to browse. Add as many as you like — the tool processes them all at once.
batch support
02
Choose Settings
Select a color depth to reduce palette size. Optionally scale down dimensions, convert to grayscale, or flatten transparency.
full control
03
Optimize
Click Optimize PNG — the Canvas API re-encodes every image with your chosen settings. Each file shows original size, optimized size, and exact savings.
instant results
04
Download
Download files individually or grab them all in a single ZIP. Filenames are preserved with "-optimized" appended. No watermark, ever.
ZIP download
Start Optimizing free · no signup · no upload

Why Use PNG Optimizer?

A PNG optimizer helps reduce the file size of PNG images without significantly affecting visual quality. Large image files can slow down websites and increase loading times, which can negatively impact user experience and search engine performance.

By optimizing PNG images, unnecessary data is removed while the core visual elements remain intact. This allows images to load faster while maintaining their clarity and sharpness.

For website owners, designers, and developers, using a PNG optimizer is an effective way to improve page speed and manage image performance. Smaller image files help websites run more efficiently while still delivering high-quality visuals to visitors.

Features

Everything in One Optimizer

📦
Batch Processing
Optimize dozens of PNG images in one go — upload them all and download a single ZIP when done.
🎨
Color Depth Control
Reduce the palette from 24-bit full color down to 256, 128, 64, or 16 colors for dramatic file size savings on graphics and logos.
🔍
Scale Down
Resize images to 10–99% of their original dimensions before re-encoding — fewer pixels means exponentially smaller files.
📊
Per-File Savings
Every file shows its original size, optimized size, and percentage saved — plus an animated savings bar for instant comparison.
✂️
Metadata Stripping
Remove embedded text chunks, author data, software tags, and creation timestamps that silently inflate PNG file sizes.
⚫
Grayscale Conversion
Convert colour PNGs to grayscale during optimization — removing color data yields significant additional size reductions for monochromatic content.
🔁
Re-optimize Instantly
Not happy with the result? Adjust settings and hit optimize again — no need to re-upload your files.
💸
Free Forever
No subscription, no watermark, no file count limit. Optimize as many images as you need, always free.
Color Depth Reference

Which Color Depth Should I Use?

PNG compression works differently from JPEG — since PNG is lossless, the primary lever for reducing file size is limiting the number of unique colors (palette quantization). The table below guides you to the right setting for your content type.

Color Depth Name Typical Savings vs. Original Best For
24-bit Full Lossless 5–20% Photos, complex gradients, images where color accuracy is critical
256 Colors Recommended 30–60% Most web graphics, logos, UI elements, illustrations with moderate color variety
128 Colors Balanced 45–70% Icons, app assets, simple illustrations where slight dithering is acceptable
64 Colors Aggressive 55–80% Flat design graphics, social media icons, background patterns with limited color ranges
16 Colors Maximum Compression 70–90% Simple logos, pixel art, flat illustrations — visible banding on photos or gradients
Who It's For

Who Uses a PNG Optimizer?

🌐
Web Performance
Reduce page weight by optimizing PNG logos, icons, and UI elements before uploading to your CMS or CDN.
🎨
Design Assets
Compress Figma, Sketch, or Photoshop exports that are bloated with metadata and unoptimized palettes.
📧
Email Attachments
Reduce PNG screenshots and graphics before attaching to emails — stay well under attachment limits.
🔐
Privacy Cleaning
Strip embedded metadata — author names, software version, creation timestamps — before sharing PNGs publicly.
🛍️
E-Commerce Listings
Batch-optimize product images and transparent backgrounds to meet marketplace limits and speed up storefront loads.
☁️
Cloud Storage
Shrink PNG asset libraries before archiving or syncing — saves storage costs and upload bandwidth significantly.
📱
App Icons & Assets
Optimize iOS and Android app assets — smaller bundles mean faster installs and lower data usage for end users.
📰
Screenshots & Docs
Compress PNG screenshots before embedding in documents, slide decks, or wikis — without losing text sharpness.
Pro Tips

Get the Most from the Optimizer

Start with 256 Colors
tip → starting point
For most web graphics, logos, and UI elements, 256 colors is the sweet spot — visually identical to full color in nearly all cases, but 30–60% smaller. Only use full 24-bit if you're working with photos or complex gradients that need smooth tonal transitions.
Metadata Is Silent Bloat
tip → metadata
PNGs exported from design tools like Figma, Sketch, or Photoshop often carry large embedded text chunks — software version, author, ICC color profile data, and creation timestamps. Strip Metadata is on by default and should stay on for all web-destined files.
Scale Before Color Reduction
tip → workflow order
The Scale slider and Color Depth settings compound each other. Scaling to 75% before reducing to 256 colors produces much smaller output than either setting alone. Use both for thumbnails, previews, or any image where exact pixel dimensions aren't critical.
Transparency Is Always Preserved
tip → transparency
All optimizations — including color depth reduction and grayscale conversion — preserve the alpha channel by default. Enable "Flatten Transparency" only if you know the image will always be shown on a white background, as it removes the alpha channel entirely for an extra size boost.
Use Grayscale for Non-Color Content
tip → grayscale
Grayscale conversion removes the color channels entirely for screenshots of black-and-white documents, ink drawings, or wireframes. Combined with 256-color mode (which maps to 256 shades of gray), this can reduce file size by an additional 20–40% vs. color mode.
PNG vs. WebP: Know When to Convert
tip → format choice
If your target is the web and you don't need broad compatibility with older software, consider converting to WebP after optimizing — WebP typically achieves 25–35% additional savings over optimized PNG at equivalent quality. Use the PNG Optimizer for files that must remain in PNG format.
FAQ

Frequently Asked Questions

What does a PNG optimizer do?
A PNG optimizer reduces the file size of PNG images while maintaining transparency and image quality.
Why should PNG images be optimized?
Optimizing PNG files helps improve website loading speed and reduces storage space usage.
Does optimizing PNG images reduce quality?
Good optimization tools reduce file size without noticeably affecting visual quality.
Are optimized PNG images suitable for websites?
Yes, optimized PNG images help improve website performance and page loading times.
Can PNG optimization keep transparent backgrounds?
Yes, PNG optimization tools usually preserve image transparency.
Can multiple PNG images be optimized at once?
Many tools support batch optimization for processing multiple images quickly.
Get Started

Ready to Optimize Your PNG Images?

Compress PNG images without losing clarity and improve website loading speed easily.

Optimize PNG

No account · No upload · No data stored · Works offline