Video size calculator: how long fits in 8MB, 10MB, 20MB or 25MB

🧮 Try it (it’s free and it can’t hurt you) #

📊 The big table of numbers (tap one) #

What is left for the picture, in kilobits per second (kbps), with the sound kept. More is better: 1,000 kbps is 1 megabit per second. Tap a number to try it above.

Swipe sideways for more sizes →

• 1,000 kbps or more: good to sharp
• 500 to 1,000: fair
• 254 to 500: soft
• 145 to 254: may look too low
• 72 to 145: very low
• under 72: too low for free accounts

^P Longer than the free limit at that size, so it needs Premium. A dash means longer than even the Premium limit. Shaded numbers are a rough guide to the picture, not a promise: a calm talking head looks fine on less than a football match does.

⏱️ The longest video each size can hold #

How long a video can run before the picture drops to each quality, with the sound kept. The last two columns are the longest video 8mb.video will accept at all.

Sizes between these (and other sizes you type in) get a limit that sits between their neighbours. Removing the sound gives the picture up to about a quarter more room, so every “fits” time above gets a little longer.

🔍 How the numbers are worked out #

• Size ÷ length = bitrate. A size in MB is multiplied out to bits and divided by the seconds. 8mb.video counts a megabyte as 1,048,576 bytes, the way your computer does.
• It aims just under the size you pick. The picture and sound are planned to use about 93% of it, which leaves room for the container around them, so the finished file lands under your limit rather than over.
• Sound takes its share first. About 18% of the file goes to the sound, never more than 192 kbps. That’s why removing the sound helps when you’re short on room.
• Picture size follows the bitrate. The copy you get back is at most 1920 pixels wide, and 1280 (720p) when the picture gets less than 4,000 kbps, which is nearly always. So when there’s too little room, the result shows up as soft, blocky motion rather than a smaller picture.
• Three warning lines. Under about 254 kbps of picture, 8mb.video warns that the quality may be too low. Under about 145 it calls it dangerously low. Under about 72, free accounts are asked to pick a bigger size or a shorter clip; Premium can still choose to encode it anyway.

Want the why behind the arithmetic, and what to do about it? How to compress a video without losing quality (much) goes through it, and How to compress a video for Discord has the worked examples.

🛠️ Your video doesn’t fit? Four ways to make it #

• Trim it. Cutting to the part you want helps more than anything else. In Options on the compressor you can skip the first or last seconds, or give a start and end time.
• Use the biggest size your app allows. Doubling the size doubles the budget. Discord’s free limit is 20MB since August 2026 (it was 10MB), and 10MB works on every account; the other apps are in the file size limits table.
• Remove the sound if nobody needs it. The room it used goes to the picture.
• Expect less from fast motion. Gameplay and sports need more bitrate than a person talking to a camera. A clip that looks fine at 500 kbps when it’s a lecture can look rough when it’s a match.

💬 Common questions #