Reduce Video Size Without Losing Quality
A generous target size, full resolution, and a frame-by-frame comparison to check the result.
When you pick a video, this page sets a target size computed for high quality at the video's own resolution and frame rate. With Screen size on Original, the resolution does not change. You can check the result against the original frame by frame before downloading.
Free Video Compressor
No sign-up. No upload. No size limit.
Nothing is uploaded — the file is compressed on your device.
What "without losing quality" can mean
Every format this tool writes (H.264, HEVC, VP9, AV1) is lossy, so a re-encoded file is never bit-for-bit the same as the source. What you can get is a file that looks the same on screen at a lower bitrate.
The target on this page is worked out at about 6 Mbps of video for 1080p at 30 fps in MP4, scaled for other resolutions and frame rates. It is never set above the source's own video bitrate, because extra bits would only preserve noise. If that leaves nothing to save, the estimate row says "At this setting the file stays about the same size." The file was already encoded at or below this bitrate; keep the original.
Checking the result
Press Compress video. When it finishes, open the Compare tab: a slider splits the frame between the two versions, and you can step 1 or 10 frames at a time. Fine texture (grass, dark gradients) is where differences show first. The original file is never changed, so you can try a smaller target with the 70%, 50%, 30% or 10% buttons and compare again.
If the Format list under Advanced offers MP4 · HEVC or WebM · AV1, those formats hold more detail than H.264 at the same size. MP4 (H.264) plays on more devices. The list only shows formats this browser can encode on this device.
Leave Audio on Keep as is to copy the sound track unchanged. Audio with more than 2 channels is mixed down to stereo only if it is re-encoded.
What reduces quality
Lowering the resolution. Keep Screen size on Original unless the video will only be watched on a smaller screen.
A target that is too small for the resolution. In that case the panel picks a lower resolution itself and says "Resolution set to W × H to reach this size." If you see that note, raise the target size or accept the smaller picture.
Compressing a copy that was already compressed. Start from the original recording whenever you have it.
Frequently asked questions
Is this truly lossless?
No. The output formats are lossy. The aim is a file that looks the same on screen; if you need an exact copy, keep the original, which this tool never modifies.
How much smaller will it get?
That depends on how the source was encoded. After you pick a video, the estimate row shows the original size, the size after and the percentage that remains, before anything is encoded.
Why does it say the file stays about the same size?
The estimate is at least 97% of the original, so the source bitrate is already at or below the target. Keep the original.
HEVC or AV1?
Both give smaller files than H.264 at the same quality. Pick whichever the Format list offers and the viewer's device plays; choose MP4 (H.264) when it has to play everywhere.
Reduce Video Size Without Losing Quality
Opens the compressor with a target size computed for this page.