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Video Size Reducer vs Constrict: catalog facts
Video Size Reducer	Constrict
Free Free to use.	Free Free and open source under the GPL-3.0-or-later.
Web	Linux
Processes videos locally in the browser Offers target size and quality settings	Targets an exact output file size automatically Batch compression of multiple videos
The tested input path supports MP4 with H.264 and optional AAC Processing can take several minutes and use significant memory	Steep size reductions can badly hurt quality or fail Speed limited by local hardware
Web application	Downloadable app
Closed source	Open source
License not stated	License: GPL-3.0-or-later
No account needed	No account needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked October 8, 2026	Official website Full listing and sources Checked October 1, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.