EXR to PNG Converter
You have an EXR from a renderer or a compositing tool and you want an image that opens everywhere without compression artefacts. PNG gives a lossless eight-bit picture that browsers, chat apps and presentation tools understand. This converter tone-maps the floating-point data on your device, so the brightness range is reduced in the process.
Embed this tool on your websiteShow code
Free to use on any site. Paste the code where you want the tool to appear. It runs inside the page; visitors' files are processed in their own browser and are not uploaded.
WordPress and most site builders have a "Custom HTML" block where this code can be pasted. The embed keeps a small link back to CalcMaster.
How to convert EXR to PNG
- Add your EXR files by dropping them, clicking the drop zone or pasting.
- The output format is already set to PNG. Adjust quality or size if you need to.
- Press Convert and compare the original and new size for each file.
- Download each file or all of them as a ZIP.
When to convert, and when not to
- You want an artefact-free review image of a render, with clean edges on text and interface elements.
- A tool accepts PNG but not EXR.
- You are writing documentation or a bug report and need a sharp picture of the output.
- Do not use it to keep dynamic range: only the 8-bit result is saved, so keep the EXR for grading.
What changes
- Floating-point values are tone-mapped to eight bits, and brightness above white is not stored.
- A rule of thumb leaves out the display curve when values never exceed 1.0 and average 0.3 or more, so colours can differ from your viewer.
- The picture is flipped so that it appears upright.
- The PNG is lossless from the 8-bit data, so no further quality is lost, and there is no quality slider.
- Metadata and extra channels are not written.
Lossless output, lossy first step
The PNG itself is lossless, but the step from floating-point to eight bits is not. Whatever the EXR held above white, or between steps that eight bits cannot represent, is rounded away before the PNG is written. The PNG is therefore an exact copy of the 8-bit picture, not of the EXR.
If you need to hand someone the exact numbers, send the EXR itself. The PNG is a copy made for looking and sharing.
How the brightness is chosen
The converter squeezes the full range into the range a screen shows, then applies a curve so that mid-tones look natural. A file whose values stay at or below 1.0 and average 0.3 or more is treated as already prepared for display and is not curved a second time. That rule is a heuristic and can be wrong for unusual files, so judge the result against your own viewer.
Good uses for the PNG
Render reviews, documentation, tutorials and issue reports are typical uses. The lossless edges keep thin lines and text legible, which matters for interface mock-ups and technical renders. For photographic renders destined for a web page, a lighter JPG or WebP may be a better fit and can be chosen in the same options.
Memory and file size
Large renders need a lot of browser memory. If the page reports a problem, reduce the size with the resize option or convert one file at a time. PNGs of detailed renders can also be big, so look at the size beside each result.
Using the PNG in documentation
A PNG of a render drops easily into a wiki page, a pull request or a slide. Because the compression is lossless, thin lines, labels and interface elements stay readable at the size you choose. Name the file clearly, because the PNG carries no render metadata such as the settings or the software version. If you need to record those, keep them in the text next to the image.
Privacy: your files stay on your device
- The tool decodes, resizes and encodes your pictures with your browser. The files are never sent to a server.
- To check it yourself: open the browser developer tools (F12), open the Network tab, convert a file, and look for any request that carries your image. You will see none.
Frequently asked questions
Why does my PNG look different from my viewer?
Tone mapping depends on exposure and curve choices, and this tool also applies a rule of thumb about display curves. Compare with a viewer you trust.
Is the high dynamic range kept?
No. PNG here is eight bits per channel, so brightness above white is not stored.
Why is the PNG so large?
Lossless storage of detailed renders takes space. Use the resize option, or choose JPG or WebP if a small loss is acceptable.
Should I use JPG or PNG for a render?
PNG for sharp edges and exact pixels, JPG for lighter photographic previews.
Can I convert several renders at once?
Yes. They convert one after another and can be downloaded together as a ZIP.
Does the PNG carry the render settings?
No. Metadata stored in the EXR is not written to the PNG, so note any settings you need elsewhere.