From source file to delivery
Decide whether cloud processing is acceptable
Before selecting a file, consider who appears in it and whether it may leave your device. For confidential recordings, stop here and use a suitable local compression workflow.
Compress a permitted sharing copy
For a video you may upload, select the original and make a smaller MP4. If the app reports a ceiling, use a target below that value rather than a guessed universal limit.
Attach the downloaded result in Signal
Save and play the result, open the intended Signal conversation and attach that new file. Confirm that the recipient can receive and play it.
Decide where the video is allowed to go
| Requirement | Appropriate action | Boundary |
|---|---|---|
| The video must stay on the device | Use a local encoder | Do not select the file in this cloud tool |
| A non-sensitive clip is too large | Create and download a smaller MP4 | Compression and Signal delivery are separate services |
| The new attachment still fails | Check actual size, connectivity and the app message | An encode finishing does not prove message delivery |
Cloud compression is outside the Signal conversation
A file uploaded to VidSmaller is processed through a separate cloud service before you send anything in Signal. Choosing Signal as the eventual destination does not make that earlier upload part of the encrypted conversation.
For confidential or restricted material, use an appropriate local encoder and follow your organization’s rules. This is a real choice of workflow, not a privacy badge. The online tool is for files you are permitted to send to a third-party processor.
Send the result, not the original gallery item
Signal’s support instructions describe attaching a photo, video or file from a conversation. Once you have downloaded the compressed copy, select that new file deliberately. Gallery thumbnails can look identical even when the sizes are different.
The support material cited here does not establish one universal size ceiling for every client and attachment path. Follow the current app message, keep margin below any stated limit and verify receipt. Network conditions and account or client behavior can still affect delivery after successful compression.
Questions before you compress
Does Signal encrypt the upload to this compressor?
No. This upload is to a separate cloud service, outside Signal’s conversation. If the video must remain on your device, do not use this online workflow.
What target size should I use for Signal?
Use the limit currently reported by your client when one is shown, and leave headroom below it. This page deliberately does not advertise an unverified universal Signal file-size cap.
Can this page send the video to my Signal contact?
No. Download the result and attach it yourself in Signal. The compressor does not access your conversations, contacts or message delivery state.
References and next steps
Guide updated 2026-11-11. External applications and account rules can change.
Have a strict size budget? Use the bitrate calculator. For source files near the upload ceiling, check the large video limits. Read the privacy policy before sending sensitive material.