You record a sharp video on your iPhone, text it to a friend with an Android phone, and what arrives looks like it was filmed through frosted glass. Send the same video to another iPhone and it looks fine. Neither phone is at fault. The difference is the route the message takes - and for a long time, the route between iPhones and Android phones was a very narrow one.
#Why it happens: MMS
Between iPhones, Messages uses iMessage, which sends videos over the internet with fairly light compression. Between an iPhone and an Android phone, there's no iMessage, so before iOS 18 the message fell back to MMS - the picture-messaging system from the early 2000s that runs through your mobile carrier. MMS has tiny size limits, set by each carrier: in the US, around 1 MB on AT&T and around 3 MB on T-Mobile and Verizon.
That limit is the whole story. An iPhone records 1080p video at roughly 60 MB a minute, so a 30-second clip is about 30 MB (How much storage does video take? has the numbers). To squeeze it under 1 MB, the phone has to shrink it about thirty times over - lowering the resolution and throwing away most of the detail. That's the blur.
#What changed with iOS 18: RCS
iOS 18, released in September 2024, added RCS - the modern replacement for SMS and MMS that Android phones already use. With RCS, messages between iPhones and Android phones go over the internet, and attachments can be up to about 100 MB, so videos arrive much sharper. Videos added straight into the chat can still be compressed somewhat, but nothing like MMS.
RCS only works when everything lines up:
- The iPhone runs iOS 18 or later, with RCS Messaging turned on (Settings → Apps → Messages).
- The iPhone's carrier supports RCS. Most major carriers do; some smaller ones and some countries don't yet.
- The Android phone uses an RCS messaging app, usually Google Messages, with RCS chats turned on.
You can tell which you're using: when RCS is active, the message box on the iPhone says "Text Message · RCS". If it says just "Text Message", you're on SMS and MMS.
How much room each route gives a video
| Route | Size limit | What a 30 MB clip looks like |
|---|---|---|
| MMS (green bubbles, before RCS) | about 1-3 MB | Heavily blurred |
| RCS (iOS 18 and later) | about 100 MB | Mostly sharp |
| iCloud or Google Photos link | none in practice | Original quality |
| WhatsApp, as a document | 2 GB | Original quality |
#Five ways to send a video at full quality
1. Turn on RCS
If both phones and both carriers support it, this fixes the problem for every future message with no extra steps. Check the settings above on both ends.
2. Share a link instead of the file
A link sends the original video, whatever its size. On the iPhone, select the video in Photos, tap Share, and choose Copy iCloud Link (this needs iCloud Photos turned on), then paste the link into a message. Google Photos, Google Drive and Dropbox all work the same way, and the Android user can download the full-quality video from the link.
3. Use Mail Drop
Email the video from the iPhone's Mail app. For large attachments, Mail offers Mail Drop, which uploads the video to iCloud and emails a download link instead - for files up to 5 GB, available for 30 days.
4. Use WhatsApp, Telegram or Signal
These send over the internet, so carrier limits don't apply. They still compress videos by default: in WhatsApp, choose HD before sending, or send the video as a document for the original file. WhatsApp "format not supported" explains the difference between the two.
5. Copy it over directly
For lots of videos, or very long ones, connect the iPhone to a computer, copy the videos off, and transfer them to the Android phone with a cable or a USB stick. It's slower, but nothing gets compressed along the way.
#If you have to use MMS
Sometimes MMS is the only option - an older phone, or a carrier without RCS. Then the best you can do is give MMS less to squeeze: trim the video to the few seconds that matter, and accept that it will look soft. At 1-3 MB, there simply isn't room for detail, whatever the phone does. If you'd rather control the compression yourself for a specific size, Compress MP4 walks through the maths.
#The short version
- Videos texted from iPhone to Android went over MMS, which limits attachments to about 1-3 MB - that's what blurs them.
- iOS 18 added RCS, with attachments up to about 100 MB, when both carriers and both phones support it.
- For full quality, share an iCloud or Google Photos link, use Mail Drop, or send through WhatsApp as a document.
- On MMS, trim the clip short; nothing can make 1 MB look sharp.