Compress PNG
Reduce PNG file size up to 80% while maintaining quality. Fast, secure, and free.
or drop files here
Maximum file size: 50MB per file
Convert to a modern format for better compression. WebP is recommended for best results.
High Quality
Maintain file quality while reducing file size up to 80%.
100% Secure
All processing happens in your browser. Your files never leave your device.
Super Fast
Compress multiple files in seconds with our optimised algorithms.
Compress, convert & crop images offline on iPhone - privacy-first, batch up to 200
Compress to Target Size
Quickly compress your files to specific file sizes
About PNG Compression
Why PNG files are large — and what actually shrinks them
PNG is a lossless format: every pixel is preserved exactly, which is why logos, screenshots, and graphics with sharp edges or transparency look crisp but balloon in size. The two biggest contributors are uncompressed pixel data and a full colour palette. Effective PNG compression re-encodes that data — through palette reduction, alpha-channel handling, and deflate recompression — without changing a single pixel's appearance. The result is a file that looks identical but loads far faster.
100% in-browser: your images never leave your device
Unlike online compressors that upload each image to a remote server, this tool runs entirely in your browser using the Canvas API and WebAssembly. That means no upload wait, no server-side storage, and no privacy exposure — important for ID scans, design assets, or any sensitive graphic. Processing happens at the speed of your own CPU, and the optimised file is saved directly back to your device.
Where optimised PNGs matter most
PNG is the right choice when you need transparency, crisp text, or flat regions of colour — logos, UI elements, icons, line art, and screenshots. After compression these assets stay razor-sharp while meeting strict size budgets for web pages, email attachments, app bundles, and CDN delivery. For photographs, a lossy format such as JPG or WebP usually reaches a smaller size; PNG wins when fidelity and transparency are non-negotiable.
What should I check before downloading?
Before emailing a PDF, open the downloaded copy and check fine text at the intended viewing size. The tool can reduce image detail; its target size is not guaranteed. If forms, signatures or searchable text matter, keep the original PDF.
- Compare the downloaded file’s quality and actual size.
- Savings vary by file. Some tools return the original if the output is larger; check the resulting format and size.
How to Compress :format Files
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1
Select PNG Files
Click the upload button or drag and drop your files into the upload area. You can select multiple files at once.
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2
Compress Files
Click the "Compress All Files" button. Our tool will process each file and show you the compression results in real-time.
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3
Download Compressed Files
Download your compressed files individually or all at once as a ZIP archive. Your original files remain unchanged.
Frequently Asked Questions
How to compress PNG without losing quality?
Our PNG compressor uses lossless optimization to reduce file size without any quality loss.
How to reduce PNG file size online?
Upload your PNG and choose between lossless and lossy compression for the best balance.
What is the difference between lossless and lossy PNG compression?
Lossless mode keeps every pixel identical to the original — ideal for logos and UI assets. Lossy mode reduces the colour palette and applies subtle quality reduction to reach much smaller file sizes, which suits previews and thumbnails.
Are there file size or quantity limits?
Because compression runs entirely in your browser, there is no server upload limit. The practical limit is your device's available memory, so very large batches or huge images may take longer on low-RAM devices.
Will compression remove transparency from my PNG?
No. The alpha channel that stores transparency is preserved, so logos and graphics with transparent backgrounds keep their transparency after compression.
Is my PNG file uploaded to a server during compression?
No, all compression happens locally in your browser using JavaScript and WebAssembly. Your images never leave your device, making the tool safe for confidential screenshots, private photos, or business graphics. No account or upload is required.
How much smaller will my PNG get after compression?
Most PNG files shrink by 30-80% depending on content. Screenshots and flat-colour graphics with few colours compress best, often dropping below 500 KB. Detailed photos saved as PNG typically see smaller gains of 10-30% since they contain more image data.
Can I compress PNG images on my phone or tablet?
Yes. The tool works in any modern mobile browser, including Chrome on Android and Safari on iOS 14 or later. Compressed PNGs save directly to your device's Downloads folder or photo library, and batch compression of multiple images works the same as on desktop.
Why Choose Let Compress?
- Compare the downloaded file’s quality and actual size.
- Savings vary by file. Some tools return the original if the output is larger; check the resulting format and size.
Compress images
Adjust image quality or dimensions. Lossy output can change fine detail; preview text and edges before using it.
There is no guaranteed saving or exact target for every file. If the result is larger, some tools return the original; compare its format and size before sharing. Before emailing a PDF, open the downloaded copy and check fine text at the intended viewing size. The tool can reduce image detail; its target size is not guaranteed. If forms, signatures or searchable text matter, keep the original PDF.
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.
Compress, convert, and edit images. Support PNG, JPG, WebP, AVIF, GIF and more formats.