How to Compress a PDF for Gmail Without Exceeding Attachment Limits
Learn how to compress PDF files for Gmail without exceeding the 25 MB limit while protecting your privacy with 100% client-side WebAssembly processing.
## Understanding Gmail's True Attachment Limits Gmail imposes a strict 25 MB limit on the total size of attachments per email. However, many users do not realize that standard MIME encoding (Base64) introduces an overhead of roughly 33% to any attached file. As a result, a PDF document weighing 20 MB on your local drive may easily trigger an attachment bounce error, as the email server calculates its transmission weight at over 26 MB. When this threshold is crossed, Gmail automatically prompts you to upload the file to Google Drive and share a cloud link instead. While convenient, this workaro
