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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.

  • Free to use
  • No file stored beyond 1 hour
  • Encrypted over TLS 1.2/1.3
  • No watermarks

Drag and drop your files here or click to upload.

Maximum file size is 1GB

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How it works

Three steps to your converted file

Everything happens in your browser tab - upload, pick a format, download. The heavy lifting runs on our servers.

  1. 01

    Upload your file

    Drag and drop, click to browse, or paste a URL. Batches take up to 20 files at once - 230+ input formats across video, audio, image, document, and archive types.

  2. 02

    Choose an output format

    Pick from over a hundred output formats. Filter by category or search by name - every option is open to everyone, no account needed.

  3. 03

    Convert & download

    Hit Convert and grab your download link moments later. Originals are erased when the job completes; results are cleared within about an hour.

What is an ACE file?

ACE Archive

Developed By
Marcel Lemke (e-merge GmbH)
Initial Release
1999
MIME Type
application/x-ace-compressed

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.

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Why RunConvert

The fastest way to convert any file

Purpose-built for speed, privacy, and breadth of format support.

  • 3,000+ conversions supported

    Every popular and niche format covered - video, audio, image, document, archive and more. New formats added regularly.

  • Fast, cloud-powered

    No queue, no waiting. Files are processed on high-performance servers and returned in seconds, even for large files.

  • Secure & private

    Encrypted in transit and never shared with anyone. Uploads are erased the moment your job completes, and results shortly after.

  • Free - no account needed

    Convert without creating an account - no credit card, no trial clock. Sign in only if you want history and higher daily limits.

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