Free Resize Video Tool

Resize video is for the practical problem that appears after the recording is already useful: the dimensions are not right for the place where the file needs to go. A 4K phone clip may be overkill for a support ticket. A screen recording may need to fit inside a help article. A product demo may have to match a course portal, CMS upload field, ecommerce gallery, chat app, or social draft. Choose a local video, check the source resolution, then decide whether to resize by width, resize by height, fit inside a bounding box, or force exact dimensions. FFmpeg runs in your browser and exports a compatible MP4 that you can preview before downloading.

1. 1

   Choose the source video

   Select an MP4, MOV, WebM, phone clip, or screen recording. The preview and source readout help you confirm the video, duration, file size, and original resolution before resizing starts.

2. 2

   Choose the resize mode

   Use width mode when the destination has a maximum width, height mode when vertical space matters, fit mode when both width and height are limits, and exact mode only when stretching is acceptable.

3. 3

   Export and review the MP4

   Run the conversion, keep the tab open while FFmpeg encodes, then preview the resized MP4. Check small text, faces, motion, aspect ratio, and audio before using the result.

Video dimensions affect almost every handoff. A file can be technically playable and still be awkward because it is too large for a web page, too wide for a mobile layout, too tall for a product gallery, or too heavy for a learning platform. Many upload fields recommend 720p or 1080p even when the source is 4K. Support teams often need a small enough clip to see the issue quickly. Documentation teams want readable UI details without embedding a giant file. Resizing solves that mismatch by changing the frame size, not by pretending the content itself needs a full editing session.

A good resize video workflow should make the aspect ratio choice explicit. Preserving aspect ratio avoids stretched faces, oval logos, and distorted UI. Fitting inside a box is useful when a destination gives maximum dimensions but does not require an exact canvas. Exact dimensions can be useful for strict placeholders, but it can stretch the image when the source shape is different. This tool keeps those options visible, pairs them with CRF quality and encoding speed, and runs locally in the browser so everyday dimension changes do not require uploading a private recording to a cloud converter.

The resize mode is the most important decision. Width mode exports an even-width video and lets FFmpeg calculate the matching height. Height mode does the reverse. Fit mode keeps the picture inside the width and height you enter while preserving aspect ratio, which is a safe choice for 1280 x 720, 1920 x 1080, and other common boxes. Exact mode creates the entered dimensions exactly and should be used carefully because it can stretch the picture. CRF controls quality after resizing; start near 23 for a clean result and raise it only when smaller size matters. The preset controls encoding speed, and the audio switch decides whether narration, music, or ambient sound should remain in the MP4.

Open the output and look for distortion before you share it. Circles should still look circular, faces should not be squeezed, logos should not be stretched, and small UI text should remain readable. If the video is for a bug report, make sure the important area of the interface is still visible at the new resolution. If it is for a course or product page, check that the result looks good inside the final layout, not just in a standalone player. Keep the original file until the resized MP4 has been accepted by the destination.

• Use width mode when the destination cares about maximum width and the height can follow the original aspect ratio.
• Use fit mode for safe bounding boxes, such as 1280 x 720 or 1920 x 1080, without stretching the picture.
• Keep CRF around 23 for cleaner resized output, then raise it only when a smaller file matters more than detail.

The selected video is processed by FFmpeg running in your browser. The app writes the source into FFmpeg's local virtual filesystem, applies the scale filter, encodes the MP4, and returns a download link. The normal workflow does not need a server upload, account, or conversion history, which is useful for internal screen recordings, client demos, class material, product walkthroughs, and personal phone clips.

Resizing changes dimensions; it does not remove sensitive content. Names, emails, private browser tabs, account numbers, API keys, customer records, faces, addresses, and background audio can remain in the output. If the source has visible or audible private information, trim, mute, blur, crop, or remake the source before sharing. Also remember that downscaling can make text harder to read, so review the result as the recipient would see it.

Use a dedicated editor when you need crop framing, letterboxing, captions, overlays, picture-in-picture, multi-clip assembly, exact broadcast specifications, or color-managed delivery. Browser FFmpeg is a strong fit for short everyday resolution changes, but very long 4K videos can still be slow or memory-heavy. If the source is important, export a short resized test first and keep the original until the final version has been checked.

• You need visual crop framing, background padding, subtitles, overlays, color grading, or professional delivery specs beyond resizing.
• The source is already small, heavily compressed, or too long for browser memory; resizing cannot recover missing detail.