Video Size Reducer

Compress a video

Video Compressor

A video compressor that runs entirely in your browser. Set a target in megabytes, let the local encoder do the work, and download the smaller file — the source never leaves your device.

One video at a time. The source stays in this browser.

Target

25 MB

Guidance appears after a video is selected.

Handle a target size that is not tied to a platform.

You choose the MB target for this session.

Choosing a video compressor

Every compressor makes the same trade between size, quality, and where your file goes. Here is how the pieces fit together before you pick one.

What a video compressor actually does

Compression means re-encoding: reading the source, throwing away information according to a bitrate budget, and writing a new, smaller file.

  • The bitrate budget rules everything

    A compressed file is roughly bitrate times duration. Cut the budget and the encoder must drop pixels, frames, or detail — some combination, never nothing.

  • Trimming is not compressing

    Cutting footage shortens the video; compressing keeps the length and shrinks the file. The two stack well: trim first, then compress what remains.

  • Platforms compress again anyway

    Chat apps and social platforms re-encode uploads themselves. Starting from a clean, right-sized file makes their final version more predictable.

Browser vs desktop vs online service

Three kinds of video compressor exist, and they differ mainly on where your file goes and how fast the pass runs.

  • Browser-local (this tool)

    No install, no upload, no account. The encoder is WebAssembly — same family of algorithms as native tools, slower, and capped by the tab's memory at roughly 300MB or 10 minutes of source.

  • Desktop apps

    Fastest option and no size ceiling to speak of, but they need installing, sometimes a license, and trust in the vendor.

  • Online services

    Convenient from any device, but the classic ones upload your video to a server, keep it for a while, and often meter free output behind queues or watermarks. The cloud path here is interest-based, and the local pass is the default.

What quality loss to expect

The honest answer depends on the ratio between source size and target size, not on the tool.

  • Mild ratios look fine

    Cutting 30 to 50 percent of the file size usually keeps quality close to the original for personal footage.

  • Aggressive ratios change the look

    Keeping one percent of the data — 1GB into 10MB — means visible blockiness, lower resolution, or both. No compressor escapes the arithmetic.

  • Content matters

    Talking heads and screen recordings survive tight budgets; handheld sports and confetti fall apart first.

Picking a target size

The best target is usually not a number you invented — it is the limit of wherever the video needs to go.

  • Destination-first targeting

    Chat upload caps and email attachment limits hand you the number. Working backwards from the destination avoids both bouncing files and needless quality loss.

  • Leave a margin

    Landing just under the cap is safer than landing exactly on it, because receiving systems re-encode attachments slightly during transport.

  • One file at a time

    This compressor is deliberately single-file so each job stays predictable. Batch and queue work belongs to the cloud path.

Video compressor questions

How this compressor works and how it compares to the alternatives.

Yes. The local compressor runs in your browser without an account, a payment step, or a usage meter. You bring the browser; that is the whole setup.

No. The compression pass runs locally in the tab — the source stays in your browser session and the smaller file downloads directly. Nothing is transmitted while the encoder runs.

The encoder is ffmpeg compiled to WebAssembly: the same algorithms, but sandboxed and bound by the memory limits a browser puts on a tab. Convenience and privacy are the trade.

Desktop Chrome handles roughly 300MB or 10 minutes of source comfortably. Larger jobs are pointed at the cloud path instead of starting a transcode that would fail.

Some, always — how much follows the ratio. Cutting a third to a half of the size usually looks near-original; extreme ratios like 1GB to 10MB visibly change the picture no matter which compressor you use.

Yes — the home page carries presets for Discord, Gmail, WhatsApp, Reels, TikTok, Shorts, and X, plus dedicated pages for the common caps like 10MB and 25MB.

Next steps: how to compress a video step by step, why video files are big and how to shrink them, or the video size reducer home for platform presets.