ImageLean
No upload required Browser-based Local processing 1 formats

Compress PNG Online

Optimize PNG images locally in your browser. PNG stays the default output unless you choose another format.

Compression Settings

Lower quality = smaller file size

File sizes use KiB (1,024 bytes) and MiB. Target sizes are best effort and may not be reached.

Processing and limitations

Compare

ImageTiny app icon

ImageTiny

Compress + batch

Need faster photo compression on iPhone?

ImageTiny handles on-device compression, crop, resize, format conversion, and EXIF cleanup, with batch processing for up to 200 photos.

On-device Batch 200 Privacy-first
Download on App Store

Best for common iPhone photo workflows like HEIC, JPG, PNG, and WebP.

Related Tools

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Compress PNG to 200KB Reduce PNG size to a target limit for screenshots and transparent assets. Compress PNG to 100KB Reduce PNG size to a target limit for screenshots and transparent assets. Compress PNG to 50KB Reduce PNG size to a target limit for screenshots and transparent assets. Compress PNG to 20KB Reduce PNG size to a target limit for screenshots and transparent assets.

Compress PNG Online and Reduce PNG Size

Use this page to compress PNG online when you need to reduce PNG size for website assets, screenshots, transparent graphics, UI exports, and design handoff files.

Below 100% quality, color quantization changes pixels. At 100%, PNG encoding is lossless; resizing still changes pixels and metadata may be removed. Output is an 8-bit still PNG: APNG animation and 16-bit depth are not preserved. If the optional encoder fails, browser export may be larger. Compare the preview, dimensions and actual file size.

Reduce PNG Size for Web Graphics

Compress PNG online before publishing app screenshots, interface mockups, diagrams, icons, and transparent assets.

Keep PNG When Transparency Matters

This workflow is ideal when you want a PNG compressor but still need PNG output for graphics with transparency or pixel accuracy.

Convert Only If You Want Smaller Output

PNG stays the default, but you can still switch to JPG or WebP manually when the smallest possible file matters more than keeping PNG.

Processing and limitations

Compression may reduce image quality or dimensions. Compare the result before downloading. Animated GIFs retain animation only with GIF output.

File sizes use KiB (1,024 bytes) and MiB. Target sizes are best effort and may not be reached.

W3C PNG Google WebP

Compress Image Online Without Uploading

100% Client-Side

All processing happens directly in your browser. Your images never leave your device.

Batch Image Compression

Reduce image file size for multiple images at once, then download each file or a ZIP.

Adjust Compression Level

Control the compression level to balance visual quality and file weight.

JPG, PNG, WebP, GIF

Compress images across the most common web image formats.

How to Reduce Image File Size Online

1

Upload

Upload or paste the image you want to compress online.

2

Configure

Adjust quality, width, or height if you want to reduce image size more aggressively.

3

Compress

Click "Compress" to compress image size in your browser.

4

Download

Download the optimized image with a smaller file size.

Frequently Asked Questions

This tool compresses image online inside your browser, so your files stay on your device while you reduce image size and reduce image file size.

Yes. You can adjust quality and dimensions to compress image size while keeping a strong visual result for web, email, and documents.

You can compress image online for JPG, PNG, WebP, GIF, and HEIC files.

Yes. Batch mode lets you reduce image size online for multiple files and download them one by one or as a ZIP.

A quality setting around 75-85 usually gives a good balance between visual clarity and smaller file size for web publishing.

Start by lowering quality first. If the file is still too large after reaching quality 60, then try reducing dimensions as well.

Yes. HEIC input is supported. The tool can convert and compress HEIC files to JPG, WebP, or other formats directly in your browser.

Below 100% quality, color quantization changes pixels. At 100%, PNG encoding is lossless; resizing still changes pixels and metadata may be removed. Output is an 8-bit still PNG: APNG animation and 16-bit depth are not preserved. If the optional encoder fails, browser export may be larger. Compare the preview, dimensions and actual file size.

PNG compression: quality and transparency

PNG is a lossless file format, but reducing its colour palette before encoding changes pixels. This tool uses colour quantisation below 100% quality. At 100% it uses lossless PNG encoding; resizing still changes pixels. Metadata may be removed. This browser workflow outputs 8-bit still PNG images; APNG animation and 16-bit channel depth are not preserved. If the optional encoder fails to load, browser PNG export may produce a larger file. Compare the preview, dimensions and measured file size before downloading. For an English–French product label, inspect accented characters and small bilingual text after colour reduction. Transparent edges and pixel dimensions should be checked in the actual downloaded image, not inferred from a percentage saving.

PNG format specification

Last updated: October 11, 2026

References & Resources

Authoritative specifications and references for the file formats this tool works with.

W3C - PNG Specification (Third Edition)

The current W3C standard for PNG, aligned with ISO/IEC 15948.

RFC 2083 - PNG (Portable Network Graphics) Specification

The original 1996 IETF specification that introduced the PNG format.

PNG - Wikipedia

Format structure, color types, and compression internals of PNG.

libpng - Official Reference Library

The canonical PNG reference library and documentation.