Compiled HTML Help .chm
A Microsoft help package containing HTML pages and related resources.
Server processing uses engines we host. Availability depends on the deployed engine and supported file variant.
CHM file format guideCHM to OEB converter
Convert Compiled HTML Help (.chm) to OEB for free. Choose files, review the available settings and download your results. No account needed.
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Open eBook package .oeb
An OPF/HTML/resource directory. Our hosted converter downloads its files together as a ZIP archive.
OEB export produces an OPF manifest, HTML content and resources packaged together as a ZIP download; it is not a single OPF file.
OEB file format guideHow to convert CHM to OEB
- Select CHM files from your device or drag them into the converter.
- Check the OEB output. Open conversion settings if you want to make adjustments.
- Convert, compare the original and result, then download your files.
Quality, compatibility and file limits
DRM-free books only. Layout, pagination and typography may change, especially from fixed-layout formats.
Processing uses your device when possible and our servers when required. Browser files are limited to 256 MB each; server conversions to 64 MB; browser spreadsheets to 32 MB. Previews show supported content and do not guarantee identical rendering in every application.