Compress Video Online
Reduce video file size by up to 90% without losing quality. Compress MP4 and more to any target size — free, no watermark, no signup needed.
Choose your file
Pick a quality mode
Compress
Download
Compress to an exact size
Jump straight to the file-size limit your form asks for.
Specialized video tools
The same compressor, pre-configured for the job in the URL — 4K, H.265, huge files and 1080p downscales.
Compress a video to an exact size — 10 MB, 20 MB, 25 MB or any limit
Most video compression is really an upload-limit problem: a form says 10 MB, an email bounces at 25, a chat app refuses the file. Target size mode starts from the number instead of the settings — type the megabytes you need and the planner works out the resolution, frame rate, codec and bitrate that fit it, shows you the predicted result before anything uploads, and then uses a two-pass encode to land just under your budget.
It is honest about physics, too. A one-hour video cannot become 5 MB and still be watchable, so when a target is smaller than the file can go the tool says so up front, tells you the smallest good-quality size, and still delivers the closest possible file rather than failing. For worked examples, see the guides to compressing a video to 10 MB, to 20 MB and under 25 MB.
Made for WhatsApp, Discord, Instagram or email
Every platform has its own rules, and the presets encode them so you do not have to look them up: WhatsApp re-compresses anything over its 16 MB video-message limit, Discord’s free tier stops at 20 MB, and a “25 MB” email attachment cap really means about 20 MB once encoding overhead is counted. Each preset targets safely inside its platform’s limit at the best quality that fits.
For uploads rather than messages — Instagram, YouTube, Facebook, X — the presets match what the platform accepts cleanly, so your video is not degraded a second time by the platform’s own re-encode. The step-by-step guides cover the details: WhatsApp, Discord, email and Instagram Reels, Stories and posts.
MP4, MOV, MKV — and the H.264 vs H.265 choice
MP4, MOV, MKV, AVI, WEBM and WMV all upload directly — including MOV and HEVC footage straight off an iPhone, which is the file most often too big to send. Output is MP4 by default because it plays everywhere: on the phone of whoever you send it to, in every browser, on Windows and Android where a MOV often will not open.
The codec inside that MP4 is the real size lever. H.264 plays on effectively every device made this decade; H.265 packs the same visual quality into roughly 25–40% fewer megabytes but needs newer hardware to play. In Target size mode the planner chooses automatically — H.264 while the budget allows it, H.265 when the target is tight — and you can override it in the advanced options or use the dedicated H.265 compressor. The H.264 vs H.265 guide explains when each wins.
Keep the quality, lose the megabytes
Cameras and phones deliberately record with far more bitrate than playback needs, which is why a video can shrink by 70–90% with no difference you would notice on a phone or laptop screen. The Balanced mode targets exactly that point; the tool analyzes your file first and shows the predicted size, saving and quality level for every mode before you commit to anything.
The single biggest lever is resolution: 4K footage compressed to 1080p keeps looking sharp on almost any screen it will ever be watched on, at a fraction of the size — there is a dedicated 4K video compressor for exactly this, and a large-file workflow for files up to 2 GB. If you want to understand what compression actually does to your picture, the guide to compressing video without visible quality loss shows real comparisons.
Three steps, no account
Choose your video
Drag and drop a file, or pick one from your device. Uploads are resumable if your connection drops.
Pick a mode
Take the balanced default, or choose a platform preset such as WhatsApp, Instagram or YouTube.
Download
Watch live progress, compare the before and after size, and download your smaller file.
Frequently asked questions
Is this video compressor really free?
Yes — compressing videos is free, with no watermarks and no signup. Files up to 2 GB are supported.
Will compression ruin my video quality?
The balanced mode targets the point where file size drops sharply but visible quality barely changes — typically 70–90% smaller with no difference you would notice on a phone or laptop screen.
What happens to my video after I compress it?
Your video is uploaded over an encrypted connection, compressed on our servers, and permanently deleted within 24 hours. Nobody looks at it and it is never shared.
What's the best setting for WhatsApp?
Use the WhatsApp preset — it targets 720p H.264 within WhatsApp’s 16 MB video limit, so the file sends without being re-compressed again.
How do I get a video under Discord’s upload limit?
Pick the Discord preset — it keeps the file under the 20 MB free-tier cap. If you want headroom for several clips, use Target size mode and type 10 MB; the tool predicts the result before you upload.
Can I compress MOV videos from an iPhone?
Yes. MOV and HEVC footage from an iPhone uploads directly, and the output is an MP4 that plays everywhere — including on Windows and Android, where the original often will not.
Learn more
What compression actually throws away, why the destination decides the setting, and how to hit a hard size limit on the first try.
7 min readWhere the 10 MB limit comes from, the bitrate arithmetic behind it, and how Target Size mode lands within a few percent of it — free, in your browser.
6 min readWhere 20 MB upload limits come from, how much video the math allows at each duration, and how Target Size mode lands within about 3% on one pass.
6 min readWhy a 25 MB email limit really means 20 MB on disk, and how a two-pass target-size encode lands under it on the first try.
6 min readDiscord caps free uploads at 20 MB. Hit that number on the first try: pick the Discord target and a two-pass encode lands within about 3%.
6 min readGmail and Outlook stop at 25 MB, and encoding eats a third of that. How to pick a target size that actually arrives on the first try.
7 min readLearn how to compress video for WhatsApp status and sharing without losing quality. CompressKits' free online tool guides you to the right settings for perfect uploads.
6 min readLearn to compress videos for smaller files without visible quality loss. This guide details optimal settings, codecs, and an iterative workflow using our online tool.
6 min readLearn how to significantly reduce video file size for website backgrounds and banners without sacrificing visual impact, ensuring fast load times and a seamless user
6 min read
Learn the precise settings to compress video for Instagram Reels, Stories, and posts, ensuring optimal quality and quick uploads.
6 min readLearn to shrink large iPhone videos, like 4K .MOV files, for easy sharing via email or messages without excessive quality loss. Get concrete steps and ideal settings.
6 min readLearn to effectively downscale your 4K video to 1080p, drastically reducing file size while maintaining visual quality for sharing and uploads.
6 min readThe practical difference between H.264 and H.265 (HEVC): real size savings, device compatibility, encode speed, and a simple rule for choosing between them.
7 min readKeep the full 4K resolution and still cut 60–90% of the file: why camera files are so inflated, what H.265 changes, and the settings that stay visually lossless.
7 min readLearn to quickly reduce video file sizes on your iPhone or Android phone using CompressKits.
6 min readMaster YouTube video compression to reduce file size, upload faster, and maintain quality.
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