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DYNAMB

Compress Video to 25MB (Email-Ready)

Compress a video to under 25MB so it attaches to an email instead of turning into a Google Drive link — 25MB is the attachment cap for Gmail (and 20MB for Outlook, so give yourself margin). Compression happens entirely in your browser: no upload wait, no watermark, and the file never touches a server on its way to your inbox draft.

  • No upload — files stay on your device
  • Works offline once loaded
  • Free forever, no signup, no watermark
Drop a video here, or tap to choose MP4, MOV, WebM or MKV — it never leaves your device
  • Size {{ sourceSizeLabel }}
  • Duration {{ durationLabel }}
  • Resolution {{ meta.width }}×{{ meta.height }}
  • Audio {{ meta.hasAudio ? 'Yes' : 'None' }}

This is a large file (over 500 MB). It will still work — everything streams from disk — but expect the encode to take a while, especially on a phone. Keep this tab in the foreground until it finishes.

Target size

The result is aimed a few percent under this number so it clears the platform limit.

≈{{ estimate.kbps }} kbps of video for this length — quality: {{ estimate.grade }}

Quality
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Preview
  • Before {{ sourceSizeLabel }}
  • After {{ resultSizeLabel }}
  • Saved {{ savedPercent }}%

✓ Landed under {{ targetMb }} MB.

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On iPhone: after tapping Download, use Share → Save Video.

How to use this tool

  1. Drop your video

    MP4, MOV, WebM or MKV — the 25MB Gmail target is preselected. Sending via Outlook? Type 20 into the custom target instead.

  2. Compress

    The tool works out the bitrate your clip's length affords at 25MB, encodes on your device's hardware, and verifies the size — running a second pass if the first lands over.

  3. Attach and send

    Download the MP4 and attach it like any file. It plays directly in Gmail's preview, no download needed on the other end.

Questions people ask

What is the email attachment size limit?

Gmail allows 25MB per message, Outlook.com 20MB, Yahoo 25MB, and most company mail servers 10–25MB. Note the limit applies to the whole message — attachments are also base64-encoded in transit, which adds ~33%, so a "25MB" file can be rejected. Aiming under 25MB with margin (which this tool does automatically) is the safe play; use 18–20MB if the recipient's server is strict.

Why does Gmail turn my video into a Drive link?

When an attachment exceeds the 25MB cap, Gmail silently uploads it to Google Drive and sends a link instead — which then needs permission settings and a Google account on the other end. Compressing under the cap keeps it a plain attachment anyone can open.

How much video fits in 25MB?

Roughly: 1–2 minutes looks great, 5 minutes looks decent at 480–720p, and 10+ minutes gets soft. For a long recording, consider trimming to the relevant section — or compressing to 25MB and accepting the quality trade.

Is my video uploaded to a server?

No. Everything runs in your browser using your device's own hardware video encoder (WebCodecs). This site has no upload endpoint for the tool at all — the video never leaves your device, and there is no upload wait before compression even starts.

Does compressing a video reduce quality?

Yes — a smaller file means less data. The tool keeps quality as high as the target allows by downscaling resolution intelligently instead of just starving the bitrate, and it shows you an honest quality estimate before you run.

What video formats can I compress?

MP4, MOV, WebM and MKV in; MP4 (H.264 + AAC) out — the most compatible format for every platform and player.

Which browsers does this work in?

Chrome and Edge (desktop and Android) have full hardware encoding support. Firefox and older Safari versions may lack the WebCodecs encoder — the tool detects this and tells you plainly instead of spinning forever.

Related tools

Free because it costs us nothing to run: your browser does the work, not our servers. Made by Dynamb Technologies — we build software for businesses.