Does PNG compression lose quality?

Deflate optimization is 100% lossless — no pixel changes. Palette reduction converts 24-bit to 8-bit color, which is technically lossy but invisible for screenshots, logos, and UI assets with limited color palettes.

How much smaller will my PNG files get?

Typically 30–70%. The median reduction on Convertify is 58%. Logos with flat colors save the most (up to 83%). Complex images with gradients save less.

Does it keep transparency?

Yes. The alpha channel is fully preserved including semi-transparent regions like shadows and glass effects.

PNG or WebP for web images?

PNG for broad compatibility (email, Slack, legacy tools). WebP for modern web delivery — 25–35% smaller with full transparency. See our PNG to WebP converter.

Can I compress multiple PNGs at once?

Yes. Upload up to 10 .png files at once. Each file optimizes and downloads individually.

Is it safe to compress PNG online?

Yes. All files transmit over HTTPS, process in memory, and delete immediately after download.

What is the difference between lossless and palette?

Lossless (deflate) changes encoding without altering any pixel. Palette reduction limits colors to 256 — visually lossless for most graphics but technically irreversible.

Can I undo PNG compression?

Deflate changes are reversible. Palette reduction is not. Always keep originals.

Convert PNG to PNG Online Free — Fast Batch Conversion

You can upload a maximum of 10 images at a timeDrag & Drop your images here orChoose FileSupported formats: PNG

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How to Convert Images Online

1Upload your PNG files
Drag and drop up to 10 .png files, or click Choose File. Maximum 20 MB per file.
2Adjust optimization
The quality slider controls palette reduction. For screenshots and logos, any setting works — these images have few colors to begin with.
3Click Compress
Maximum deflate compression plus intelligent palette reduction, server-side in Rust + libvips.
4Download optimized files
Download smaller .png files with full transparency preserved. Files delete from the server immediately.

Supported Image Formats

PNG

Lossless format that preserves every pixel. Best for screenshots and logos.

HEIC

Apple photo format used by iPhone and iPad. High quality with small file size.

HEIF

High Efficiency Image Format — same as HEIC, used on Apple devices.

WebP

Modern image format by Google. Up to 30% smaller than JPG with the same quality.

JPG

Universal format for photos. Supported everywhere, great balance between quality and file size.

GIF

Classic format for simple animations. Supports transparency and up to 256 colors.

BMP

Uncompressed bitmap format. Maximum quality but very large file size.

TIFF

Professional lossless format used in printing and photography.

AVIF

Next-gen format with excellent compression. Up to 50% smaller than JPG.

PPM

Portable Pixmap format used in Unix/Linux environments.

HDR

High Dynamic Range format storing extended brightness data.

FITS

Flexible Image Transport System used in astronomy and science.

PDF

Portable Document Format. Convert PDF pages to JPG, PNG or WebP images.

AVIF vs WebP vs HEIC vs JPG

Quick comparison to help you choose the right format

AVIF

Size: Up to 50% smaller than JPG
Browsers: Chrome, Firefox, Safari
Transparency: ✓
Best for: Web performance

WebP

Size: 25-35% smaller than JPG
Browsers: All modern browsers
Transparency: ✓
Best for: Web compatibility

HEIC

Size: ~50% smaller than JPG
Browsers: Safari only
Transparency: ✓
Best for: iPhone storage

JPG

Size: Baseline
Browsers: All browsers & apps
Transparency: ✗
Best for: Universal sharing

Frequently Asked Questions

Does PNG compression lose quality?: Deflate optimization is 100% lossless — no pixel changes. Palette reduction converts 24-bit to 8-bit color, which is technically lossy but invisible for screenshots, logos, and UI assets with limited color palettes.
How much smaller will my PNG files get?: Typically 30–70%. The median reduction on Convertify is 58%. Logos with flat colors save the most (up to 83%). Complex images with gradients save less.
Does it keep transparency?: Yes. The alpha channel is fully preserved including semi-transparent regions like shadows and glass effects.
PNG or WebP for web images?: PNG for broad compatibility (email, Slack, legacy tools). WebP for modern web delivery — 25–35% smaller with full transparency. See our PNG to WebP converter.
Can I compress multiple PNGs at once?: Yes. Upload up to 10 .png files at once. Each file optimizes and downloads individually.
Is it safe to compress PNG online?: Yes. All files transmit over HTTPS, process in memory, and delete immediately after download.
What is the difference between lossless and palette?: Lossless (deflate) changes encoding without altering any pixel. Palette reduction limits colors to 256 — visually lossless for most graphics but technically irreversible.
Can I undo PNG compression?: Deflate changes are reversible. Palette reduction is not. Always keep originals.

Why are PNG files so large?

PNG uses lossless compression — every pixel stays exactly the same. That is why screenshot tools, Figma, Sketch, and design workflows default to PNG for anything with text, sharp edges, or transparency.

But lossless encoding costs file size. A 1920×1080 screenshot weighs 1.5–2 MB. A 2x retina logo export from Figma hits 500 KB–2 MB. A UI mockup with gradients reaches 3–5 MB.

The problem is not the format — it is the encoding. Most tools save PNG at 24-bit color (16.7 million colors) even when the image uses 47 unique colors. Palette optimization fixes this without changing a single visible pixel.

How palette optimization works

PNG optimization has two independent mechanisms:

Deflate compression (level 0–9): reorganizes how pixel data is stored. Level 9 tries hardest. This is 100% lossless — no pixel changes at any level. We default to maximum.

Palette reduction (quantization): converts from 24-bit (16.7M colors) to 8-bit (256 colors). A screenshot that uses 47 unique colors loses nothing. A logo with 200 colors loses nothing visible. Even UI mockups with subtle gradients typically look identical at 256 colors.

The combination reduces file size 30–70%. Across files processed on Convertify, the median PNG reduction is 58%.

Real compression results

2.2 MB macOS screenshot (1920×1080) → 540 KB — 75% smaller, text razor-sharp.

150 KB logo from Illustrator (500×500) → 25 KB — 83% smaller, all 12 colors preserved.

3.1 MB retina UI sprite sheet (2048×1536) → 890 KB — 71% smaller, every icon edge pixel-perfect.

4.8 MB camera photo saved as PNG → 3.9 MB — only 19% reduction. Camera photos should be JPG, not PNG. Convert to JPG for 5–10x smaller files.

Many screenshots are correctly saved as PNG. Most camera photos are not.

PNG vs WebP for transparency

Both PNG and WebP support alpha channels. The difference is file size.

PNG with palette optimization: good compression, universal support (every browser, email client, design tool).

WebP with alpha: 25–35% smaller than optimized PNG, supported by virtually all modern browsers but not by some email clients and legacy tools.

If you need transparency for web delivery and control the platform, convert to WebP for the smallest files. If you need compatibility with email, Slack, older CMS, or design handoff tools — compress PNG.

SVG is better for simple vector logos, but when your pipeline requires raster output, PNG compression is the next best optimization.

Lossless vs lossy — what actually happens

Deflate optimization (lossless): changes encoding, not pixels. The output file is bit-for-bit identical in visual content. You can verify by comparing hashes of the decoded pixel data.

Palette reduction (lossy): maps 16.7 million possible colors to 256. For screenshots, logos, and UI assets — which rarely use more than a few hundred colors — this removes nothing visible. For photographs with smooth gradients, it causes color banding. That is why we recommend JPG for camera photos.

Already-optimized PNGs (from pngquant or ImageOptim) will see modest gains — typically 5–10%. Unoptimized PNGs from screenshot tools and design exports see the largest savings.

Privacy and file handling

Files upload over encrypted HTTPS. Processing happens in memory — no disk writes, no content logging. Files delete immediately after download.

No account. No watermarks. No daily limits — batch up to 10 files at once. Your design assets never leave the processing pipeline.