Why free exports so often carry a logo

Online video editors that render on their own servers pay for every minute of video they encode. A free tier is how they find customers, and a logo on free exports is how that tier advertises itself: every video someone posts becomes a small ad, and paying removes it. Some services also hold back resolution, so free exports come out smaller than the source, or limit length and the number of exports per month. Those terms vary between services and change over time, so read the current export page of any tool before relying on it.

None of that is unreasonable for a business that pays for rendering. It just means that "free" and "clean" often don't go together.

Why this one has none

Here the rendering runs on your computer, inside your browser, with the video encoder built into the browser. mydubly doesn't pay for that work, so there is no free tier to protect and nothing to upsell.

The render code draws exactly three things onto each frame: your original picture, the blurred band if you switched on "Hide subtitles already in the video", and the subtitle line that is on screen at that moment. Frames with neither a subtitle nor a band reach the encoder with nothing drawn on them. There is no step where a logo, a text tag or a closing card could be added, and no check of whether you're signed in or have paid. Credits pay for AI transcription and nothing else.

Getting a watermark-free MP4

Open the editor and choose your video. Leave "Write the subtitles automatically with AI" ticked to have them generated (Google sign-in, 1 credit per minute), or untick it to import an SRT or VTT or type them.
Fix any wrong words and timing in the line list or on the timeline.
Choose a look in Style.
Click Render video. The summary lists the resolution marked "kept as is", the frame rate, the codec and bitrate, and a rough output size.
Start the render, keep the tab open, then click Download video. The file is named after your original with -subtitled.mp4 on the end.
Play it full screen once, watching the corners and the last few seconds, before you post it anywhere.

What the file keeps from your original

Resolution: The same pixel dimensions, in the orientation you see on screen. A width or height with an odd number of pixels is rounded up to the next even number, which video encoders require.
Frame rate: Unchanged.
Orientation: A phone video shot upright stays upright; a vertical 9:16 clip stays vertical.
Length: The whole video, start to finish. Nothing is trimmed and nothing is appended.
Audio: Copied untouched when MP4 can hold it; otherwise converted to AAC or Opus.
Codec: H.264 when your browser can encode that size, otherwise HEVC, VP9 or AV1.

One thing does change: the picture is encoded again, because the subtitles have to become part of it. The bitrate is set a little above the source's own, within a high ceiling, so the loss is small, but it is a re-encode rather than a copy. HDR footage comes out as SDR, and the editor warns you first. Burning subtitles without losing quality explains the trade-offs, and video bitrate explained covers why the file can come out larger than the original.

One export, no tiers

There is no export menu with 720p for free users and 4K for subscribers. The encoder settings come from your video and your browser, not from your account: a visitor who has never signed in gets exactly the same encoder settings as someone who has bought credits. What buying credits changes is limited to two things. It pays for AI subtitles, and it removes the ads that appear on the web page for 30 days. Those ads come from Adsterra and sit in a frame beside the editor; they never reach the video.

The same holds for the subtitle files. Export SRT and Export VTT are plain text with no credit line inserted, so they're ready for YouTube, Vimeo or an editing app.

Logos that are already in the video

Two situations look like watermark problems but aren't about this editor's output.

The source already carries a mark. Videos saved from some social apps include the app's own logo, and exports from free editors may carry theirs. This editor can't remove it. Subtitle the original file from your camera or editing project instead of a downloaded copy.
Old subtitles burned into the picture. "Hide subtitles already in the video" blurs a horizontal band so old lines can't be read and new ones sit on top. It blurs everything in that strip and erases nothing; hiding hardcoded subtitles shows how to size it.

And if you want your own logo on the video, that's a job for a video editor; this one draws subtitles only.

Before you publish

Corners and edges are clean at full screen.
Resolution in your computer's file properties matches the original.
The subtitles sit clear of platform buttons; check with "Show safe area".
An HEVC, VP9 or AV1 file plays where it's going. Some older players need help, as HEVC compatibility explains.
You kept the exported SRT, so a correction later doesn't mean starting over.

For a subtitle file with no video at all, the AI subtitle generator goes straight to SRT and VTT. If the word free matters as much as clean, adding subtitles online for free covers the route that spends no credits.

About the subtitle editor on this page

Opens: MP4, MOV, M4V, WebM, MKV videos your browser can decode
Subtitles from: AI (from the speech, optionally translated into one of 21 languages), an SRT or VTT file, or typing them in
You download: An MP4 with the subtitles drawn into the picture at the original resolution and frame rate, plus SRT and VTT files
Cost: Editing, styling, rendering and SRT/VTT export are free, with no account and no watermark. AI subtitles cost 1 credit per minute (5-credit minimum per video); signing in with Google gives 100 free credits and accounts get 10 free credits a day
Privacy: The video never leaves your device and is rendered in your browser. Only for AI subtitles is the audio sent, over HTTPS, and it is deleted within 30 minutes of delivery
Rendering needs: Chrome or Edge 94+, Safari 16.4+, or Firefox 130+ on a computer. Editing and SRT/VTT export work in any current browser

More: free, private and in the browser

Subtitle tools

Frequently asked questions

Is there a paid plan that removes the watermark?

There's no watermark to remove, so there's nothing to pay for. Credits buy AI subtitles only; the rendered MP4 is the same whether or not you've paid or signed in.

Will the subtitled copy be lower resolution than my original?

No. It keeps the original width, height and frame rate. It is re-encoded at a bitrate set slightly above the source's, so the picture stays close to the original but isn't a bit-for-bit copy.

Can this editor remove a watermark that's already in my video?

No. It can only blur a horizontal band, which is meant for old subtitles and blurs everything inside it. Start from an original file that doesn't have the mark.

Are the ads on the page added to my video?

No. Ads appear in a separate frame on the web page for visitors who haven't bought credits. The MP4 is encoded only from your video's frames and your subtitle lines.

Why is the subtitled file bigger than the original?

The editor encodes generously to limit quality loss from re-encoding, usually above the bitrate your original used. The summary before rendering shows the expected size.