Compress Video to 20 MB
Shrink a clip to about 20 MB for email and upload forms.
About Compress Video to 20 MB
Many email servers, school portals, and support forms reject videos above a fixed attachment size. This page opens the KiloToolbox video compressor with a 20 MB target already selected, so you do not have to guess a quality level. Upload an MP4, MOV, WEBM, MKV, or AVI file, start the job, and download an MP4 sized for a 20 MB limit. The server reads the clip duration, calculates a bitrate that fits the target, and runs a two-pass H.264 encode. The result is usually close to 20 MB rather than exactly 20.0 MB, because the MP4 container and audio track add overhead. Inputs are limited to 100 MB and temporary files are deleted within 15 minutes.
How to Use Compress Video to 20 MB
Upload a video under 100 MB
Drag the file into the upload area or pick it from your device. MP4 is the most common input, but MOV, WEBM, MKV, and AVI files are accepted too.
Keep the 20 MB target
The target size is already set to 20 MB on this page. You can choose a smaller preset or a custom size if the form has a different cap. The source must be larger than the target.
Start the two-pass encode
Click Compress video. The first pass measures how much data the clip needs, and the second pass writes the final MP4 with that budget. A longer clip takes longer to process.
Preview and download
Check the preview for readable text, clear faces, and steady motion. Then download the MP4 and upload it to the form that rejected the original file.
Common Use Cases
Email attachments
A 20 MB video usually fits a mailbox with a 25 MB attachment cap after encoding overhead. That makes 20 MB a practical target for short interviews, screen recordings, and product demos.
School and job portals
Admissions systems and applicant portals often set a 20 MB or 25 MB limit per field. Compressing to 20 MB leaves room for the portal to process the upload without a second rejection.
Support tickets and forms
Bug reports and customer support forms are easier to submit when the screen recording is small. A 20 MB clip keeps the useful evidence without forcing the reviewer to download a huge file.
Technical Specifications
| Input Formats | MP4, MOV, WEBM, MKV, AVI |
|---|---|
| Output Formats | MP4 |
| File Size Limit | 100 MB |
| Processing Engine | Dedicated secure server worker |
| Data Retention | 15 minutes |
| Batch Processing | Single file processing |
Tips for Best Results
If the portal still rejects the file, choose the 15 MB preset on Compress Video. Some forms count the request body and other fields toward the same limit.
Trim dead air and unrelated footage with Video Cutter before targeting 20 MB. A shorter clip needs less compression, so the picture stays clearer.
For a 20 MB target, resize a 4K clip to 720p or 1080p first with Resize MP4 Online. A smaller frame often looks better at the same bitrate.
Frequently Asked Questions
Will the output be exactly 20 MB?
Not exactly. The encoder aims just under 20 MB, but the MP4 container, audio track, and final muxing add a small amount of overhead. Most results land close to the target, and the download page reports the real size.
What happens if 20 MB is too small for my clip?
The encoder may have to lower the bitrate enough to blur fast motion or fine text. If that happens, trim the video first or pick a larger target such as 30 MB. A shorter clip at the same target keeps more detail.
Can I compress a 100 MB video to 20 MB?
Yes, up to the 100 MB input limit. The tool calculates the bitrate from the clip duration, so a long recording at 100 MB will need a lower bitrate than a short one.
Which formats can I upload?
MP4, MOV, WEBM, MKV, and AVI are accepted. Every output is an MP4 with H.264 video and AAC audio, which plays on phones, browsers, and presentation software.
Is the audio kept when I compress to 20 MB?
Yes. The audio is encoded as AAC, usually at 96 kbps or 64 kbps depending on the budget. If the source has no audio, the output is a video-only MP4.
My file is already under 20 MB. Should I use this page?
No. A target must be smaller than the source, so the server rejects a 20 MB target for a file that is already 20 MB or less. Use the quality presets on Compress Video instead.