A PNG optimizer that recompresses image files to a smaller size, without losing any information. This program also converts external formats (BMP, GIF, PNM and TIFF) to optimized PNG, and performs PNG integrity checks and corrections.
Publisher’s description
What is OptiPNG?
OptiPNG by Cosmin Truta is open-source Windows software in the archivers category.
Installation and requirements
The publisher provides Portable installers for 64-bit and 32-bit Windows. The main installer is 173 KB. It runs without installation (portable).
Updates and version history
The current version is 7.9.1, released on May 20, 2025. The version history goes back to November 3, 2023: 2 releases, all linked to the official files. That is about 1.3 releases a year. The last update is more than a year old.
Popularity and file types
On Windows it registers 5 file types, including .png, .bmp, .gif, .tiff and .pnm. Similar programs include 7-Zip, PeaZip and UPX.
Pros / Cons
Pros
- Open source: the code can be inspected and built by anyone
- Portable: runs without installation
- Small download (173 KB)
Cons
- No native ARM64 build
- No update for more than a year
In short: OptiPNG is an open-source archiver tool for 64-bit and 32-bit PCs. Updates have slowed down.
Is OptiPNG safe to download?
- The file is served by sourceforge.net, the publisher’s own domain
- The download link uses HTTPS
- A SHA256 hash is published, so you can verify the file:
CDC632C21E11B2E0BA6F87A0DF632F810827267F263B655002A849D3F87B06B2· Open the VirusTotal report for this hash - The link answered when we last checked it (October 22, 2026)
- The source code is public
- ExeAtlas does not host, wrap or modify installers
Related guide: How to check a file’s SHA256 hash on Windows
Recent versions
All 2 versions ›2 versions over 2 years · about 1.3 a year
| Version | Date | Size | Files |
|---|---|---|---|
| 7.9.1Latest | May 20, 2025 | 173 KB | 32-bit ZIP64-bit ZIP |
| 0.7.8 | November 3, 2023 | — | 64-bit ZIP32-bit ZIP |
Install from the command line
Silent install ›winget install --id OptiPNG.OptiPNG -escoop install main/optipngRelated guide: How to use winget: install and update apps
Also for other systems
brew install optipngInformation
- Publisher
- Cosmin Truta
- Category
- Archivers
- Licence
- Zlib
- Price
- Free
- Requires
- Windows 11 / 10
- Architecture
- 64-bit, 32-bit
- Installer
- Portable
- Version
- 7.9.1
- Released
- May 20, 2025
- Added to the catalogue
- October 10, 2024
- Versions listed
- 2
- Updates / year
- 1.3
- Website
- optipng.sourceforge.net
- winget ID
- OptiPNG.OptiPNG
- Scoop package
- main/optipng
File types it opens (5)
Ratings and reviews
No reviews yet. Be the first to rate it.
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Frequently asked questions
Is OptiPNG free?
Yes. OptiPNG is open-source software under the Zlib licence.
Is OptiPNG safe to download?
The download comes from sourceforge.net, which belongs to the publisher; ExeAtlas does not host or change the file. Compare its SHA256 hash with the one shown here, or open the VirusTotal report for that hash.
How do I install OptiPNG with winget?
Open PowerShell or Windows Terminal and run the winget command shown on this page. winget downloads the official installer and checks its SHA256 hash before running it.
Does OptiPNG run on ARM (Windows on Arm)?
There is no ARM64 build; Windows 11 on Arm can run the 64-bit and 32-bit version through emulation.
Where can I download an older version of OptiPNG?
The versions page lists all 2 versions with links to their official installer files, back to November 3, 2023.
Can I use OptiPNG without administrator rights?
Yes, it is portable: unpack and run it.
What are alternatives to OptiPNG?
7-Zip, PeaZip, UPX, Zstandard and WinRAR. The alternatives page compares them.
