PNG Compressor Online — Free, Lossless, Transparency Preserved
Reduce PNG file size without losing quality — lossless compression, alpha channel intact, no upload.
Compress PNG FreePNG files — lossless compression, batch download as ZIP.
The free online PNG compressor for designers, developers and anyone working with PNG graphics. Reduce PNG file size without losing quality — lossless compression, full transparency preservation, no upload, no account, no limits.
PNG compressor online — lossless quality, transparency intact
PNG is the standard format for digital graphics that require lossless quality and transparency support. It is the correct format for logos, UI components, icons, screenshots, illustrations and any image where pixel accuracy matters or a transparent background is required. The downside of PNG is file size — because it stores data losslessly, PNG files are significantly larger than JPEG for photographic content, and even for graphic content, unoptimized PNG files often carry redundant data that a good compressor can remove without any visual impact.
PNG images can often be reduced by 30–70% without losing visual quality. This reduction comes from optimizing the compression algorithm applied during encoding — not from removing visual information. The compressed PNG output is lossless: the pixel content, color values and transparency of every pixel in the output match the source exactly. This is fundamentally different from JPEG compression, which permanently discards image data. PNG compression is safe to apply to any PNG file without any concern about quality degradation.
Transparency is the defining feature that makes PNG irreplaceable for certain use cases. PNG supports a full 8-bit alpha channel — every pixel can have any opacity from fully transparent to fully opaque. This is what allows logos to sit cleanly on any background color, cutout images to blend into layouts and UI elements to layer over content. This compressor preserves the full alpha channel in every output file. No transparent area is filled, no semi-transparent edge is hardened, and no opacity gradient is flattened.
This PNG compressor runs entirely in your browser using JavaScript and the Canvas API. No PNG file is uploaded to any server, transmitted over the network or stored anywhere. The tool works without an internet connection after the initial page load. This makes it ideal for compressing confidential design assets — client logos, proprietary UI components, branded graphics — where you cannot send files to external services.
The tool supports batch compression: upload any number of PNG files, compress all in parallel directly in your browser, and download all compressed results as a ZIP archive. For web developers optimizing an asset library before deployment, or designers preparing a batch of PNG exports for a client, this single-session workflow saves significant time compared to processing files one at a time.
You can also convert PNG to WebP for even smaller web files, compress PNG without upload, or compress all image formats — all free, all in-browser.
- 1Upload your PNG files
Drag and drop one or more PNG files onto the upload area, or click to browse. Upload a batch of any size — all files are processed locally in your browser with no upload to any server. Transparency in source files is detected and preserved automatically.
- 2Review your files
Each uploaded file is listed with its original format and dimensions. No settings adjustment is needed for most use cases — the compressor applies optimal lossless compression by default. PNG output is always lossless and transparency-preserving.
- 3Compress all files
Click "Compress All". All files are processed in parallel in your browser — no upload, no server, fully private. A progress indicator shows compression status per file.
- 4Download compressed PNG files
Each file shows the original size, compressed size and savings percentage. Download individually or click "Download All" for a ZIP archive. Compressed PNG files are lossless, transparency-preserving and ready for deployment in any web project or design system.
Best use cases for PNG compression
Optimize PNG for web — logos, icons, UI elements
Perfect for ecommerce, social media, and marketing teams. PNG is ideal for graphics: logos, navigation icons, UI buttons, badges, overlays. These files are used on web pages where every kilobyte counts. Compressing PNG files before deploying them to a website reduces page weight, improves loading speed and contributes to better Core Web Vitals scores — without any visual change. A 300 KB uncompressed logo compressed by 50% saves 150 KB on every page that includes it, multiplied across all page views.
Compress transparent PNG for design and development
Transparent PNG files — cutout images, watermarks, UI components, app icons, sticker assets — need to maintain their alpha channel after compression. This compressor preserves the full transparency of every PNG file. Compress all PNG assets for a design system, component library or brand asset kit before delivery. The compressed files are visually identical to the originals and work on any background color without a visible border or fill.
Reduce PNG size for design deliverables and exports
Figma, Sketch, Photoshop and other design tools export PNG files at maximum quality — often producing files of 2–8 MB per export. For design deliverables shared in Notion, Confluence, Slack or email, these sizes are excessive. Compress PNG exports to 30–70% of their original size before sharing. The visual quality remains indistinguishable at any normal viewing size, while the files become practical for sharing and storing in project management tools.
Batch compress PNG images for a website or app
A website or app may have dozens or hundreds of PNG assets: product images, thumbnails, background graphics, illustration exports. Uncompressed, these assets add significant weight to every page load. Batch compress the entire PNG asset library before deployment — upload all files, compress all in parallel, download as ZIP. Replacing the original files with compressed versions reduces total asset weight by 30–70% with no visual change for any user.
Why this online PNG compressor is better
Lossless compression, transparency preservation, and privacy-first processing — for designers and developers.
Reduce PNG size without losing visual quality
PNG is a lossless format — and compressing PNG does not have to mean reducing quality. This tool applies optimized compression algorithms that reduce PNG file size by reorganizing and encoding data more efficiently, without removing any visual information. PNG images can often be reduced by 30–70% without losing visual quality. The output is pixel-identical to the source at standard quality settings, with a significantly smaller file size.
Alpha channel intact — no white fill, no quality loss
PNG is the standard format for images with transparent backgrounds — logos, UI elements, icons, cutouts and overlays. This compressor preserves the full alpha channel in every output file. No transparent area is filled with white, no edge is altered, no semi-transparent pixel is changed. Compress your transparent PNG assets with confidence that the output will work identically to the source on any background color.
Your PNG files never leave your device
All compression runs locally in your browser using JavaScript and the Canvas API. No PNG file is uploaded to any server, transmitted over the network or stored anywhere. The tool works without an internet connection after the initial page load. This makes it safe for compressing confidential design assets, client logos, UI components under NDA and any content that cannot touch a third-party service.
Complete guide to PNG compression
How to choose the best PNG compressor
When choosing a PNG compressor, the key factors are: does it preserve transparency, does it offer quality control, where does processing happen, and does it support batch compression. Transparency preservation is critical — any compressor that fills transparent areas with white is not suitable for logos, UI assets or any design element with an alpha channel. Browser-based compressors process locally with no upload latency and no privacy exposure. For design and development workflows where many PNG files need to be processed regularly, batch compression with ZIP download is essential. Avoid tools that only offer "low / medium / high" presets without a numerical quality control — the difference between acceptable and unacceptable compression is often a matter of a few quality points.
Why PNG files are large — and how compression works
PNG uses lossless compression by design, which means every pixel is preserved exactly. This is why PNG produces larger files than JPEG for photographic content — JPEG discards data the eye cannot detect, while PNG keeps everything. The size of a PNG depends on three factors: image dimensions, color depth (bit depth) and content complexity. A PNG with many unique colors and complex gradients stores more data than one with flat areas and a limited palette. PNG compression tools work by applying more efficient encoding algorithms (better deflate compression), reducing unnecessary metadata, and in some cases quantizing the color palette — reducing the number of unique colors while keeping the visual result indistinguishable. PNG images can often be reduced by 30–70% without losing visual quality through these techniques.
Common mistakes when compressing PNG files
The most common mistake is compressing PNG files that should be converted to a different format instead. A photograph saved as PNG is already inefficient — JPEG or WebP would produce a much smaller file at equivalent visual quality. Only compress PNG when PNG is the right format for the content: graphics, logos, screenshots, UI elements, icons and images with transparency. The second mistake is using a compressor that strips the alpha channel. Always verify that transparent areas are preserved after compression before deploying compressed PNGs. A third mistake is over-compressing — pushing quality too low produces visible color banding and dithering on smooth gradients. For PNG, quality 80+ preserves visual fidelity for most design assets.
PNG vs JPG vs WebP — choosing the right format
PNG, JPG and WebP each have a distinct use case. PNG delivers lossless quality and supports transparency, making it ideal for graphics, logos, UI components, screenshots and any image where pixel accuracy and alpha matter. JPG delivers smaller sizes for photographs — it is lossy, but at quality 80–85 the difference from lossless is imperceptible, and file sizes are 3–10× smaller than PNG for photographic content. WebP combines the best of both: lossy and lossless modes, full transparency support, and smaller files than both PNG and JPG at equivalent quality — but it is primarily for web delivery and has limited support in desktop applications. The practical decision: PNG for design and development assets, JPG for photographs destined for web or email, WebP for web-optimized delivery where size matters most.
Frequently asked questions about PNG compression
Yes — completely free. No account, no payment, no watermark, no daily limit. Compression runs in your browser so there are no server costs.
Upload your PNG file to this tool, click "Compress All" and download the compressed PNG. No settings adjustment needed — the compressor applies optimal lossless compression by default. Free, no account, no file size limit.
No. PNG is lossless, and this compressor reduces file size by optimizing data encoding — not by removing visual information. PNG images can often be reduced by 30–70% without losing visual quality. The output is visually identical to the source.
Yes — fully. The alpha channel is preserved in every compressed output file. No transparent area is filled, and no semi-transparent edge is changed. Logos, icons and cutout images work identically after compression.
Yes. PNG uses lossless compression — all pixel data is preserved exactly. This is why PNG files are larger than JPEG for photographs, but also why PNG is the correct format for graphics, logos, UI elements and any image where quality must not be compromised.
PNG: for graphics, logos, UI elements, screenshots and images with transparent backgrounds — lossless quality, ideal for design and development. JPG: for photographs and complex imagery where file size matters more than pixel perfection — lossy but much smaller for photographic content. For web delivery where you need the smallest possible file with transparency support, WebP is the modern alternative to PNG.
PNG images can often be reduced by 30–70% without losing visual quality. Results vary by image content: flat-color graphics and icons see the largest reductions; complex photographic PNGs compress less.
Yes. Upload any number of PNG files and click "Compress All". All files are processed in parallel in your browser. Download individually or use "Download All" for a ZIP archive.
Yes. All compression runs locally in your browser — your PNG files are never uploaded to any server, never stored, and never accessible to anyone else.
This tool processes files locally in your browser — no upload, no server, no daily limit, always free. TinyPNG uploads your files to their cloud and limits free usage. For privacy and unlimited batch use, this tool is the better choice. Output quality at equivalent settings is comparable.
Yes. Open in Safari (iPhone) or Chrome (Android), upload PNG files and download the compressed results. No app required.
Yes. After the page loads, all compression runs locally on your device. No internet connection is required.
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Compress PNG Free