CompressToFit

Limit reference

Gmail file size limit

Aim for

18MB

They advertise

25MB

As of , Gmail's attachment limit is 25MB for sending and 50MB for receiving, but it measures the base64-encoded message. Keep the file itself under about 18MB.

Gmail’s own documentation

The catch

Aim for 18MB, not 25MB

Gmail's 25MB cap applies to the encoded message, not the file on your disk. Base64 encoding inflates an attachment by about 33%, so a 25MB video becomes a ~33MB message and bounces. We target 18MB, which lands under 25MB once encoded.

The tool

Compress a file to fit Gmail

Video, images or PDFs, already set to 18MB. Runs on your machine — nothing is uploaded.

Step 1: where are you sending it?

1Where is it going?

2Add your file

Video, images and PDFs, all compressed on your own machine. No upload, no account, no watermark, no limit on how many files.

There is also a dedicated 18MB page

Reference

Other platform limits

Every one of them dated, and the advertised number next to the one that works.

All 15 limits, and the form specifications

Background

Why the limit bites, and what to do about it

All guides