How to shrink a video for email, Discord or WhatsApp
Phones record video at bitrates meant for a big screen, so a one-minute clip is easily 100 MB or more, and email and chat apps refuse anything past a few tens of megabytes. The fix is not a magic setting but a trade: fewer bits per second, and usually fewer pixels to spend them on. This guide explains how that trade works, what fits into common limits, and how to make a clip small enough with Compress Video without sending it to anyone's server first.
Why a size limit is really a bitrate limit
A video file is, to a close approximation, its bitrate multiplied by its length. A clip recorded at 12 megabits per second uses 1.5 MB for every second, so a minute is about 90 MB. To make the same minute fit into 10 MB, the whole file — picture and sound together — has to average about 1.3 megabits per second. Length is the lever people forget: the same limit that holds a sharp 30-second clip can only hold a blurry five-minute one.
That is why Compress Video asks for a size, not a quality number. Target size divides the megabytes you allow by the clip's length, keeps a small margin for the file's own structure, reserves room for the sound, and gives the rest to the picture. Then it chooses a resolution that bitrate can actually fill: a low bitrate spread over 1080p looks worse than the same bitrate at 720p, because each pixel gets too little detail to stay clean.
What fits into common limits
These are the resolutions Target size picks for a 30 frames-per-second landscape clip with sound. Portrait clips behave the same way with width and height swapped. Real results land close to the target, and the tool reports the actual size.
- 10 MB: about a minute at 720p; two minutes at 480p; five minutes only at 240p.
- 25 MB: a minute at 1080p; two minutes at 720p; five minutes at 480p.
- 50 MB: two minutes at 1080p; five minutes at 720p.
Upload limits differ by service and change over time, so check the number the app shows you. Gmail accepts about 25 MB per message and moves larger files to Drive links; aim a little under the limit because email encoding adds overhead. Discord has changed its free upload limit several times, so read the message it shows when a file is too large. WhatsApp compresses videos sent from the gallery on its own; sending a file as a document keeps it as you made it. If a clip still does not fit at a size that looks acceptable, trim it: halving the length doubles the bitrate available for what remains.
Making the file smaller, step by step
- Open Compress Video and add the clip, or up to 20 clips that need the same treatment. Each row shows the resolution, length, size and an estimate of the result.
- For a hard limit, choose Target size and pick 10, 25, 50 or 100 MB, or type your own. For a general size cut without a fixed number, Small (up to 720p) is the default and suits sharing; Balanced keeps up to 1080p; Smallest drops to 480p for chat.
- If the clip is long, add Trim from the Also row first, or send it to Trim Video, so the bitrate is spent only on the part you need. Mute removes the sound entirely and gives its share to the picture.
- Click Compress, play the result in the page, and download it. The row says how much smaller it became. If a clip is too long to fit the target even at the lowest quality, the page warns you before you start; trim it or raise the limit.
The video is read and encoded by your own browser. It is never uploaded, so a private clip stays on your device, and a 500 MB file does not have to cross a slow connection twice.
Keeping it watchable
Compression removes detail you cannot get back, so keep the original. A few habits make a small file look better. Steady footage compresses far better than shaky handheld video, because the encoder can reuse more of each frame. Busy scenes — water, leaves, confetti, fast pans — need the most bits, so give them a larger target or a shorter length. Talking-head clips and screen recordings of slides survive low bitrates well.
- Speech-only clips? Lower resolution costs little; people watch faces and listen to words.
- Screen recordings with small text? Keep the resolution and shorten the clip instead, because text blurs first.
- Sound matters more than it seems: a slightly soft picture with clear audio feels better than a sharp picture with garbled sound. Compress Video keeps the sound at a steady rate rather than starving it.
Formats, phones and what changes in the file
Every result is an MP4, usually H.264 video with AAC sound, which plays on phones, computers, email previews and chat apps. iPhone videos in HEVC and videos from screen recorders are accepted as long as your browser can decode them; Safari, and Chrome or Edge on most recent computers, handle typical phone footage. Frame rates above 30 are brought down to 30 for target sizes, which saves bits without visible loss for most clips.
Compression is a new encode, not a copy, so camera metadata such as location may not survive; keep the original if you need it. Very long or very high-resolution files take a while on a phone, and the page keeps the screen awake and asks before closing while a job runs.