Web App
Check Attachment Size Before Preparing An Email
Work with locally selected EML or MBOX exports, including supported messages inside ZIP files. This app processes the files in your browser and does not connect to a live mailbox. Select files or saved draft messages and estimate the encoded email size; identify which files cause a selected size limit to be exceeded.
Screenshot
Inspect the interface
Description
What is this software?
Work with locally selected EML or MBOX exports, including supported messages inside ZIP files. This app processes the files in your browser and does not connect to a live mailbox. Select files or saved draft messages and estimate the encoded email size; identify which files cause a selected size limit to be exceeded.
Features
- Select files or saved draft messages and estimate the encoded email size; identify which files cause a selected size limit to be exceeded.
- Open selected local files or a folder for the comparison or draft-size calculation.
- Set Message Limit MiB using the app controls.
- Review the results and download the retained output ZIP without reopening the source files.
Work with locally selected EML or MBOX exports, including supported messages inside ZIP files. This app processes the files in your browser and does not connect to a live mailbox. Select files or saved draft messages and estimate the encoded email size; identify which files cause a selected size limit to be exceeded.
Features
- Select files or saved draft messages and estimate the encoded email size; identify which files cause a selected size limit to be exceeded.
- Open selected local files or a folder for the comparison or draft-size calculation.
- Set Message Limit MiB using the app controls.
- Review the results and download the retained output ZIP without reopening the source files.

