Troubleshooting
Video Too Large to Send? Shrink It for Discord, WhatsApp & Email
7 min read
If a video is too large to send, the fix is to compress it to just under the limit of wherever you are sending it. Choose a target size, check the estimated result, and run the compression. The Compress Video tool does all of this inside your browser, so the clip is never uploaded and nothing is added to it.
This guide covers what the limits roughly are, how to work out a sensible target, and what to do when the video is simply too long to squeeze.
What the usual limits are (roughly)
Limits change often, so treat these numbers as a starting point and check the current rule in the app you are using.
| Where you are sending it | What to expect |
|---|---|
| Gmail | Attachments have long been capped at 25 MB in total. Larger files are usually swapped for a Google Drive link. |
| Outlook and other email | Often similar to or lower than Gmail. Many providers stop at 20-25 MB, and the receiving side can have its own cap. |
| Discord | Free accounts have had a small upload cap, which at the time of writing is around 10 MB. Paid plans raise it. Check the current figure in the app. |
| Videos sent as normal media are compressed and have a fairly small cap, historically about 16 MB. Sending as a document allows much larger files, but the limit can change. |
If you are not sure about a limit, aim a little under it. A file that is 24 MB on a 25 MB limit can still fail once the email wrapper is added.
The maths: how big can the video be?
File size is bitrate multiplied by duration. In practice:
size in MB ≈ bitrate in Mbps × seconds ÷ 8
So a 2 Mbps video that lasts 60 seconds is about 15 MB. To go the other way, divide your size budget by the duration to find the bitrate you can afford.
- Take your limit and shave off about 10 percent as a safety margin (25 MB becomes roughly 22 MB).
- Multiply by 8 to get megabits (22 MB is about 180 megabits).
- Divide by the length in seconds (a 2-minute clip gives about 1.5 Mbps in total).
- Subtract the audio, which is usually 64-128 kbps (0.06-0.13 Mbps). What is left is the video bitrate.
Here is what that works out to for two common targets. The right-hand columns show roughly what the tool's Auto resolution would choose.
| Clip length | Email (25 MB): video bitrate | Likely resolution | Small (10 MB): video bitrate | Likely resolution |
|---|---|---|---|---|
| 30 seconds | about 6 Mbps | 1080p | about 2.4 Mbps | 720p |
| 1 minute | about 3 Mbps | 1080p | about 1.2 Mbps | 480p |
| 2 minutes | about 1.4 Mbps | 720p | about 0.5 Mbps | 360p |
| 5 minutes | about 0.5 Mbps | 360p | about 0.2 Mbps | 360p, very soft |
You do not need to do this sum by hand. The tool reads the duration, subtracts the audio, keeps the 10 percent margin and shows the estimated size before you start. The table is useful for one thing: deciding whether the target is realistic. If the bitrate comes out below roughly 0.5 Mbps, the picture will look soft, and the answer is a shorter clip, not a smaller number.
Compress the video step by step
- Open the video compressor and select your file. MOV, MP4, MKV, WebM and most phone videos work.
- Under Goal, choose Email (≤ 25 MB), Small (≤ 10 MB) or Custom size and type the limit you need in MB. Recommended gives good quality and a much smaller file without aiming at a number, which is handy when there is no strict limit.
- Leave Resolution on Auto. It steps down to 720p, 480p or 360p when the bitrate is too low to keep 1080p sharp. Videos are only ever scaled down, never up.
- Keep the output format as MP4 unless you have a reason to change it. It plays almost everywhere.
- Check the Estimated size line. If it is above your limit, pick a smaller custom size or trim the clip first.
- Click Compress video and save the result.
Tip: If the tool warns that the video is already compact, the source was encoded at a low bitrate and there is little left to save. Try a lower resolution or a smaller target.
Trim first, compress second
The most effective way to shrink a video is to remove the parts nobody needs. Ten seconds of fumbling at the start and a long tail at the end add up. With the video trimmer you set a start and end, and the shorter clip then fits the same size budget at a much higher quality.
That is also why the compressor suggests trimming when a target is too small for the length: halving the duration doubles the bitrate you can afford. A two-minute clip at 25 MB lands around 720p, while the same footage cut to one minute can stay at 1080p.
When the video is just too long
For anything beyond a few minutes, squeezing it under 25 MB means a blurry result. In that case, do not shrink it at all. Upload it to cloud storage such as Google Drive, OneDrive, Dropbox or iCloud and send a link. Check the sharing setting so that only people with the link can open it, and remember that anyone you forward the link to can open it too.
For a meeting recording or a family video, a link is often better anyway: the recipient gets the original quality and it does not clog their inbox. Compress when you need a real file in the chat, such as a short clip for a Discord server or a WhatsApp group.
Tips for phones
- You can compress right in the mobile browser. Keep the source under about 200 MB on a phone, since a browser needs several times the file size in memory.
- iPhone videos are often HEVC in a MOV file. The compressor's MP4 output is the widely compatible choice. If you want to avoid this in future, Settings, Camera, Formats, Most Compatible records in a more widely supported format.
- Filming something you know you will send? Recording at 720p instead of 4K gives a far smaller file from the start.
- Keep the screen on and the tab open while compressing. Closing the tab stops the job.
- If the clip is a conversion problem rather than a size one, the MOV to MP4 converter may be all you need.
FAQ
How do I compress a video for Discord without losing too much quality?
Check the current upload limit for your account, choose a custom size just under it, and keep Auto resolution. For short clips of under a minute at about 10 MB, 480p or 720p still looks fine on a phone. If it looks soft, trim the clip to give it more bitrate per second.
Why does WhatsApp make my video look bad?
When you send a video as normal media, WhatsApp recompresses it to fit its own limit. You can compress it yourself first so you control the result, or send it as a document if the current limit allows it.
Is my video uploaded when I compress it here?
No. The compression runs on your device, so nothing is sent to a server. There is no sign-up and no watermark.
The estimate is bigger than my limit. What now?
Lower the custom size by a few MB, choose a lower resolution, or trim the video. If the clip is several minutes long, a cloud-storage link is the better option.
