ACE Converter
Convert files to and from ACE online for free. Fast, secure, and high-quality file conversion with no sign-up or software required.
Maximum file size is 1GB
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What is an ACE file?
The ACE file extension denotes a proprietary data compression archive format originally developed by Marcel Lemke of e-merge GmbH for the WinAce software. Utilizing a compression algorithm derived from LZ77 dictionary coding and Huffman encoding, the format historically offered higher compression ratios than the standard ZIP Deflate algorithm. ACE archives support robust features including 4096-bit Blowfish encryption, multi-volume spanning, and integrity verification via CRC32 checksums, though the format is now considered legacy following the discovery of the critical CVE-2018-20250 path traversal vulnerability in the widely used unacev2.dll library.
How to open an ACE file
Operating systems do not provide native support for ACE archives; users must utilize third-party file compression software for extraction. While the original WinAce utility is discontinued, specific multi-format archivers such as PeaZip or BitZipper maintain backward compatibility for decompression. Notably, major utilities like WinRAR and 7-Zip have deprecated or excluded native ACE support to mitigate security risks associated with the format's legacy dynamic link libraries.
ACE Technical Info
- Full Name
- ACE Archive
- Developed By
- Marcel Lemke (e-merge GmbH)
- Initial Release
- 1999
- MIME Type
- application/x-ace-compressed
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