convertuno

Compress video to an exact size

Fit any video under Discord's 10 MB limit, an email cap, or any size you choose — without your file ever leaving your device.

Drop your video here

or

MP4, MOV, WebM, MKV, AVI and more — any size, no upload

Target size

🔒 Files never leave your device — everything runs in your browser.

How it works

  1. Drop your video

    Any common format, any size. Nothing is uploaded — the tool runs in your browser.

  2. Pick a target size

    Choose a platform preset like Discord's 10 MB, or type any size you need.

  3. Download

    Hardware-accelerated compression fits your video under the target — guaranteed.

Frequently asked questions

Is my video uploaded to a server?

No. ConvertUno runs entirely in your browser using your own device’s hardware. Your video never leaves your computer or phone — there is no upload, which is also why there is no waiting for one.

Is it really free, with no watermark?

Yes. Because compression happens on your device, serving you costs us almost nothing — so there is no watermark, no account, no file-size limit, and no daily quota.

Will the quality drop a lot?

The compressor spends your size budget as efficiently as possible: it keeps resolution when the bitrate allows it and only scales down when that is the better trade for watchable quality. Small targets for long videos will always look softer — that is physics, not the tool.

Which formats can I compress?

MP4, MOV, WebM, MKV and legacy formats (AVI, FLV, WMV, MPG) are accepted. The output is an MP4 (H.264) file that plays everywhere — Discord, WhatsApp, email clients, TVs.

Why does the exact size matter?

Platforms enforce hard caps — Discord rejects a file even 1% over its 10 MB free limit. ConvertUno treats your target as a promise: the output is guaranteed to fit under it.

Compress to an exact size

  • Compress video to 8 MBShrink any video to under 8 MB in your browser — no upload, no watermark, free. Perfect for strict upload forms and Discord's classic 8 MB limit.
  • Compress video to 10 MBCompress any video to under 10 MB right in your browser. Free and private with no upload — made for Discord's free limit and other strict caps.
  • Compress video to 16 MBGet any video under 16 MB in your browser — free, no upload, no watermark. The classic WhatsApp status limit and a common attachment cap.
  • Compress video to 25 MBCompress a video to under 25 MB in your browser — free, private, no upload. Built for upload forms, course portals, and inbox caps, with a Gmail-safe preset.
  • Compress video to 50 MBFit any video under 50 MB right in your browser — free, no upload, no watermark, no size limit on the input. Discord Nitro Basic's exact cap.
  • Compress video to 100 MBCompress any video to under 100 MB in your browser — free, private, no upload. Ideal for web uploads, portfolios, and sharing long recordings.

Compress for a platform

  • Compress video for DiscordFit any video under Discord's 10 MB free limit (or 50 MB / 500 MB Nitro tiers) right in your browser. Free, private, no watermark, guaranteed to fit.
  • Compress video for WhatsAppCompress videos for WhatsApp in your browser — free and private, no upload. Beat the 16 MB Status limit and stop WhatsApp from wrecking your quality.
  • Compress video for emailCompress a video so it actually sends by email — Gmail-safe 18 MB and Outlook-safe 15 MB presets that survive attachment encoding. Free, no upload.
  • Compress video for InstagramCompress video for Instagram in your browser — free, private, no upload. Stop Reels and Stories from coming out blurry after Instagram re-encodes them.
  • Compress video for TelegramCompress videos for Telegram in your browser — free, private, no upload. Not for the 2 GB cap, but for instant sends and streaming that actually works.

Compress by format

  • Compress MOV filesCompress huge MOV files from iPhone or Mac right in your browser — free, private, no upload. Outputs a small MP4 that plays absolutely everywhere.
  • Compress MP4 filesCompress MP4 files to any target size in your browser — free, private, no upload, no watermark. Hardware-accelerated and guaranteed to hit your size.
  • Compress WebM filesCompress WebM screen recordings and clips in your browser — free, private, no upload. Outputs a compact MP4 that plays everywhere WebM does not.
  • Compress MKV filesCompress MKV files in your browser — free, private, no upload, no input size limit. Turns bulky MKV videos into compact MP4s that play anywhere.
  • Compress AVI filesCompress old AVI videos in your browser — free, private, no upload. Ancient camcorder files become small modern MP4s that play on today's devices.