Compress PNGRight in Your Browser
Shrink PNG files right in your browser. PNGs are recompressed losslessly where possible; when a photo is better served by lossy compression, you get the smaller result automatically.
Updated January 2026
Drag & drop files here
or click to browse
Your files never leave your device
Choose settings and click Compress
1. Add your files
Drag & drop or click to browse. Multiple files supported.
2. Pick your settings
Choose the output format or compression level.
3. Download
Files convert on your device and download instantly.
About the format
PNG is a lossless format built on DEFLATE — the same algorithm inside ZIP files (RFC 1951, 1996) — so without changing any pixels, its size can only shrink so far.
- PNG became a W3C Recommendation in 1996 and stores pixels losslessly, unlike JPEG's perceptual compression.
- Reducing a 24-bit PNG to an indexed 256-color palette (8-bit) cuts pixel data by two-thirds — the classic lossless-ish PNG optimization for graphics.
- Photographs saved as PNG are a format mismatch: re-encoding them as JPEG or WebP routinely reclaims most of the file size with no visible difference.
About this conversion
PNG files get large for a structural reason: the format is lossless, so a busy image — especially a photograph mistakenly saved as PNG — stores far more data than perception needs. Compressing PNG therefore takes two routes. Where the image is a real graphic (screenshots, charts, UI), lossless recompression and palette optimization shave size without touching a pixel. Where the content is photographic, no lossless trick helps much — so this tool will produce a much smaller lossy version instead and give you whichever file is smaller.
That's why your PNG sometimes "comes back as a JPG": it's not an error, it's the tool being honest that the content was a photo in the wrong container. Graphics with text, sharp edges or transparency stay PNG — converting those to JPG would visibly smear edges and flatten alpha, so we don't.
The practical wins: screenshots destined for bug reports and docs (often 30-60% smaller losslessly), exported charts and diagrams, and web assets where PNG is required but bytes still matter. The place to skip compression is master artwork and anything you'll keep editing — recompression is for the copies you distribute.
As always here, files are processed on your device only. And the no-regression rule applies: if nothing can be saved — some PNGs are already optimally packed — you simply get your original back.
Frequently Asked Questions
Why did my PNG come back as a JPG?
PNG is lossless, so its size can only shrink so far. When quality-based compression would help (typically photos saved as PNG), the tool returns a much smaller JPG instead — and always keeps whichever file is smaller.
Is it safe to convert images online?
Yes. Unlike traditional online converters, this tool never uploads your files. The conversion runs entirely inside your browser using WebAssembly, so images never leave your device — you can even disconnect from the internet after the page loads and it still works.
Is there a file size limit?
Files up to about 1.5 GB are supported. Because processing happens in your browser's memory rather than on a server, very large files depend on your device's available RAM.
Every conversion runs 100% in your browser — zero files uploaded, ever.
How to verify it yourself →More Tools
Who we are — and what we refuse to do
We're a small team that got tired of "free" converters treating your files as the product.
So we built Converting Free the only way we'd trust ourselves: the whole toolbox — image, document and archive converters, compressors, time-zone and unit tools, calculators and text utilities — does its work on your device. Open your browser's network tab while you convert something; you'll watch nothing leave.
We don't run ads, we don't set tracking cookies, and we don't operate a server that stores files. That isn't a privacy-policy promise — it's how the site is engineered. There is simply nowhere for your data to go.
Why we built it
Search for "convert X to Y" and the top results usually want something from you before they'll lift a finger:
- —Your file, uploaded to a server you know nothing about
- —Your patience, spent on queues, captchas and "premium speed" upsells
- —Your data, harvested by the trackers stacked beneath the ads
We think a converter should be a tool, not a trade.
Ours takes nothing from you: no uploads, no accounts, no tracking.