The fastest way to shrink a video file
The simplest method is to re-encode your video at a lower bitrate using free software like HandBrake or FFmpeg. Bitrate is the amount of data your video uses per second — lowering it shrinks the file without changing the video's length or visible dimensions. A video encoded at 5,000 kilobits per second takes up roughly half the space of the same video at 10,000 kilobits per second.
HandBrake is the easiest starting point if you have never done this before. You open the video file, choose a preset (like "Fast 720p30" for smaller files), and click Start. The software handles the technical settings. The trade-off is time — re-encoding a one-hour video typically takes 30 minutes to several hours, depending on your computer and the settings you choose.
If you need results faster and do not mind paying, video editing software like Adobe Premiere Pro or Final Cut Pro can export at custom bitrates and often process files quicker on newer computers. Web-based tools like CloudConvert or Online-Convert let you upload a video and download a smaller version without installing anything, though upload and download speeds depend on your internet connection.
Key Takeaways
- Re-encoding at a lower bitrate shrinks video files by 50 to 75 percent without changing resolution, and HandBrake does this for free on Windows, Mac, and Linux.
- Lowering resolution (from 1080p to 720p, for example) saves more space than bitrate alone but makes the video look less sharp on larger screens.
- Changing the video codec — the compression method — can reduce file size; H.265 (HEVC) creates smaller files than H.264 but may not play on older devices.
- Trimming unused footage, removing audio tracks you do not need, and converting to a format like MP4 all contribute to smaller files.
- Processing time ranges from 30 minutes to several hours depending on video length, your computer speed, and the compression settings you choose.
Bitrate: the main lever for file size
Bitrate is the amount of data packed into each second of video. A typical YouTube video uses 2,500 to 5,000 kilobits per second (kbps). A video meant for archival or professional editing might use 15,000 to 50,000 kbps. Cutting bitrate in half cuts file size roughly in half, but the image quality drops too — the lower the bitrate, the more "blocky" or blurry the video becomes, especially during fast motion or scene changes.
To set bitrate in HandBrake, open your video, click the Video tab, and look for the Bitrate field. Start by trying half your original bitrate and watch a few seconds of the preview to see if the quality is acceptable. If it looks too soft or pixelated, raise it by 1,000 to 2,000 kbps and try again. This trial-and-error approach takes a few minutes but saves you from encoding a full video only to find it unwatchable.
Different content needs different bitrates. A talking-head video (one person speaking to a camera) looks fine at 1,500 to 2,500 kbps. A video with lots of movement, color changes, or fine detail needs 4,000 to 8,000 kbps to avoid visible degradation. If you are unsure, start at 3,000 kbps and adjust from there.
Resolution: trading sharpness for file size
Resolution is the pixel dimensions of your video — 1920×1080 (1080p), 1280×720 (720p), or 854×480 (480p). Lowering resolution shrinks files faster than bitrate alone. A 1080p video re-encoded at 720p typically uses 40 to 50 percent less space. Dropping to 480p cuts it by 70 to 80 percent.
The catch is that lower resolution looks noticeably softer on large screens. A 720p video looks sharp on a phone or tablet but blurry on a 27-inch monitor. If your video will be watched mostly on phones or shared on social media, 720p is usually fine. If people will watch it on desktop computers or project it, stick with 1080p or use a higher bitrate to compensate.
In HandBrake, you set resolution in the Dimensions section. You can enter custom width and height, or use a preset like "720p30" which sets both automatically. The software will maintain the original aspect ratio (the width-to-height proportion) unless you tell it otherwise.
Video codec: H.264 versus H.265
H.264 (also called AVC or MPEG-4 Part 10) is the standard codec used by most cameras, phones, and websites. H.265 (also called HEVC) is newer and compresses video more efficiently — the same video encoded in H.265 is typically 40 to 50 percent smaller than H.264 at the same quality level.
The problem is compatibility. H.265 files do not play on older phones, tablets, or computers. If you are sharing video with people who might use older devices, or uploading to a platform that does not support H.265 (like some older versions of Windows Media Player), stick with H.264. If you are archiving video for your own use or sharing with people on modern devices, H.265 is worth the smaller file size.
In HandBrake, the codec is in the Video tab under Video Codec. The default is H.264. To switch to H.265, click the dropdown and select HEVC. Encoding in H.265 takes longer than H.264 — sometimes 50 to 100 percent longer — but the result is noticeably smaller.
Trimming and removing audio tracks
If your video has sections you do not need — blank footage at the start, mistakes, or long pauses — removing them shrinks the file without any quality loss. A one-minute trim on a 30-minute video saves roughly 3 percent of the file size.
HandBrake has a trim feature in the Chapters tab. Click the Range dropdown and select Seconds, then enter the start and end times. Alternatively, use a video editor like DaVinci Resolve (free) or iMovie (Mac only) to cut out unwanted sections before encoding.
Audio also takes up space. A stereo audio track uses roughly 128 to 192 kbps. If your video has multiple language tracks or commentary you do not need, removing them saves 10 to 20 percent of file size. In HandBrake, go to the Audio tab and delete any tracks you do not want included in the final file.
File format: container types and their trade-offs
The file format (MP4, MOV, MKV, AVI) is the container that holds the video, audio, and metadata. The container itself does not compress the video — that is the codec's job — but some containers are more efficient than others. MP4 is the most compatible and works on nearly all devices and platforms. MKV supports more features and codecs but plays on fewer devices. MOV is Apple's format and works best on Mac and iOS.
For maximum compatibility and smallest file size, use MP4 with H.264 video and AAC audio. This combination plays on phones, tablets, computers, and most streaming platforms. If you need H.265 support, MP4 still works, but check that your target device or platform supports it first.
In HandBrake, the format is set in the Summary tab under Container. MP4 is the default. Changing the container alone does not change file size — only the codec and bitrate do that — but using the right container ensures your video plays where you need it to.
Comparing your options: software and services
| Tool | Cost | Speed | Best for |
|---|---|---|---|
| HandBrake | Free | Slow (30 min to several hours) | Full control, no file size limits, works offline |
| FFmpeg (command line) | Free | Slow (30 min to several hours) | Batch processing, advanced settings, scripting |
| CloudConvert or Online-Convert | Free tier limited; paid plans start around $10/month | Medium (depends on upload/download speed) | No software installation, works on any device |
| Adobe Premiere Pro | $22.49/month (subscription) | Medium to fast | Professional editing plus export, GPU acceleration |
| Final Cut Pro | $300 one-time purchase | Fast (especially on Mac) | Mac users, professional work, fast processing |
Frequently Asked Questions
How much smaller can I make a video without it looking bad?
Most videos can be compressed to 50 to 60 percent of their original size with no visible quality loss if you lower bitrate carefully. Dropping to 30 to 40 percent of original size usually shows some softness or blockiness, especially during motion. The exact threshold depends on the original bitrate, resolution, and content type.
Will my video play on other devices after I compress it?
Yes, if you use MP4 format with H.264 codec. This combination plays on virtually all phones, tablets, computers, and streaming platforms. If you use H.265 codec, check that the device or platform supports it — older devices may not. Always test on the device you plan to use before deleting the original.
Can I compress a video that is already been compressed?
Yes, but quality drops each time you re-encode. If you compress a video twice, the second version will look noticeably worse than the first. Always keep the original file and compress from that if you need to try different settings. Re-encoding an already-compressed file is a last resort.
How long does it take to compress a video?
Encoding time depends on video length, your computer's processor speed, and compression settings. A one-hour video typically takes 30 minutes to two hours on a modern computer using HandBrake at standard settings. Using faster presets or a newer computer can cut this in half. Older computers or more aggressive compression can take several hours.
What is the difference between trimming and re-encoding?
Trimming removes unwanted sections but does not change the file format or compression. It is fast (usually a few seconds) but saves only a small amount of space. Re-encoding changes the bitrate, resolution, or codec, which shrinks the file much more but takes much longer. Use trimming to remove mistakes, then re-encode the result for maximum compression.