Video Resizer

1. 1

   Add your video

   Drop in an MP4, MOV, WebM or MKV file. It is read on your device — nothing is uploaded.

2. 2

   Choose a size

   Pick a resolution preset, a platform preset such as Reels or YouTube, exact width and height, a percentage, or a long edge.

3. 3

   Decide how it fills the frame

   Fit keeps the whole picture, Fill crops the overflow so there are no bars, Stretch forces the exact frame.

4. 4

   Resize

   Press Resize. Scaling is hardware accelerated and runs in the background, so the page stays responsive.

5. 5

   Download

   Check the new dimensions on the result card, then download. A batch comes down as one ZIP.

Resizing changes width and height. Compression reduces file size mainly by lowering bitrate. Use resize when you need specific dimensions (e.g. Instagram 1080x1080, TikTok 1080x1920). Use compress when dimensions are fine but the file is too large. Resize down often reduces size as a side effect; compression shrinks size without changing resolution.

Resize to meet platform specs or change aspect ratio. Compress when the resolution is already correct but uploads are too heavy. Downscaling (e.g. 1080p to 720p) reduces pixels and often file size; compression targets bitrate at a given resolution.

Match each platform's recommended dimensions before uploading. Every size below is one press on the Platform tab — you do not have to type it.

• YouTube: 1920x1080 (1080p) or 3840x2160 (4K) for best quality.
• Instagram: 1080x1080 (square), 1080x1350 (portrait), or 1080x1920 (Reels).
• WhatsApp: 1280x720 or 640x360 for faster sending.
• Ads: 1200x628 (Facebook), 1080x1080 (display), 1920x1080 (video ads).
• TikTok: 1080x1920 (9:16 vertical).
• Pinterest: 1000x1500 (2:3), the shape its feed is built around.
• LinkedIn: 1200x675 (16:9) for feed video.

Resizing fits content to platform rules, cuts file size when lowering resolution, improves playback on slow connections, and keeps visuals consistent across devices.

Benefits of video resizing

• Platform fit: Meet size and aspect requirements for social and web.
• Smaller files: Lower resolution usually means smaller files.
• Faster playback: Lighter files load and stream more smoothly.
• Device compatibility: Avoid oversized frames on mobile or embeds.
• Bandwidth: Use less data for viewers on limited connections.

A target frame rarely has the same shape as the clip you are starting from, and there are only three honest answers to that. This tool asks you which one you want instead of picking silently.

The three choices

• Fit: the whole picture, scaled down until it sits inside the target. Nothing is cropped and nothing is distorted, so the output can end up smaller than the frame you asked for. This is the default and the right answer most of the time.
• Fill: the frame is filled exactly and whatever hangs over the edges is trimmed, centred. This is the answer to "resize for Reels without black bars" — a 16:9 clip becomes a true 1080x1920 vertical with no letterboxing.
• Stretch: the exact frame, aspect ratio ignored. Useful when a specification demands a size and the distortion does not matter; the tool warns you when it would be visible.

If you want the bars but want them to look deliberate — a blurred, coloured or mirrored background rather than black — that is a different job, and the aspect ratio tool does it.

Shrinking a picture means deciding what happens to the detail that no longer fits. The rule that decides it is the resampling filter, and most video tools never let you see it, let alone choose it.

What each one is for

• Lanczos: the default, and the sharpest. It looks at a wide neighbourhood around every output pixel, which is what keeps fine texture readable through a big reduction such as 4K to 720p.
• Bicubic: slightly softer than Lanczos and slightly less prone to ringing on hard edges. A good choice for graphics and screen recordings with a lot of flat colour.
• Bilinear: the simplest smooth option. Fast, soft, and the closest match to what most other resizers do without telling you.
• Nearest: no blending at all. The only correct choice for pixel art and for anything where a hard edge must stay hard.

Scaling is hardware accelerated, so the sharpest filter costs no more time than the simplest one. There is no reason to trade quality for speed here.

Standard sizes help you pick targets quickly.

Standard resolutions

• 240p: 426x240 — the smallest preset, for previews and drafts.
• 360p: 640x360 — messaging and low-bandwidth sharing.
• 480p (SD): 854x480 — smaller files, basic quality.
• 720p (HD): 1280x720 — solid for web and social.
• 1080p (Full HD): 1920x1080 — high quality for most uses.
• 1440p (2K): 2560x1440 — very sharp on large screens.
• 2160p (4K): 3840x2160 — ultra HD, largest files.

Every preset is applied by its short edge, so "1080p" on a portrait phone clip means 1080x1920 rather than a stretched landscape frame.

Set expectations before you change resolution.

Key statistics

• 1080p to 720p often cuts file size on the order of half, depending on codec and content.
• Many social platforms recommend 1080p or lower for uploads.
• 4K footage is roughly four times the pixels of 1080p — files grow quickly.
• Keeping aspect ratio avoids stretched or squashed video.
• Downscaling usually looks better than upscaling.
• Asking for a size the clip already has does no work at all here — the file is copied, not re-encoded, so the picture is untouched.

Guidelines for cleaner results.

Quality considerations

• Keep the aspect ratio locked unless you intentionally need a different frame.
• Prefer downscaling over upscaling. Enlarging is available, but it cannot add detail that was never recorded.
• Pick resolution for your target platform and screen size.
• Balance dimensions with file size for sharing.
• Preview after resizing to confirm sharpness and framing — the result card shows the new dimensions next to the old ones.

Platform recommendations

• YouTube: 1080p or higher for quality; 720p is acceptable for lighter files.
• Instagram: 1080x1080 or 1080x1920 depending on format.
• Facebook: 1280x720 or 1920x1080 work well.
• TikTok: 1080x1920 vertical is standard.
• Twitter / X: 1280x720 or 1920x1080.

Frames are decoded once, scaled to the new width and height, and written back out. The aspect ratio can be locked so the picture is never stretched, and the sound is carried across untouched rather than re-encoded.

Resizing process

• Read the file: Dimensions, frame rate, rotation and codecs come from the container's own tables — nothing is decoded to learn them.
• Work out the frame: Your preset, platform, exact size, percentage or long edge becomes one target rectangle, clamped to the source unless you have asked to enlarge.
• Scale each frame: Frames are decoded in a single pass and scaled with the filter you chose, in the background, so the page stays responsive.
• Carry the sound across: The audio track is copied bit for bit whenever the output container can hold it, so a resize never costs you sound quality.
• Write the file: A new MP4, WebM, MOV or MKV, with the result's real dimensions shown on the card before you download.

If the size you asked for is the size the clip already is, nothing is re-encoded at all: the compressed frames are copied straight across, which takes a fraction of a second and leaves the picture bit for bit identical.

Powered by optimised video encoding pipelines.

Common issues when resizing.

• Nothing happened when I picked a file? The tool takes MP4, MOV, WebM and MKV. Anything else is refused straight away with a message and a link to the converter, rather than being accepted and failing later.
• The result is smaller than the size I asked for? A preset is a ceiling, not a target — the tool will not enlarge your clip unless you tick Allow enlarging. Turn it on if you need the exact frame.
• My video came back with black bars, or cropped? That is the Fit setting. Fit keeps the whole picture, Fill crops to the frame edge, Stretch forces the exact shape. For a padded background with blur or colour, use the aspect ratio tool.
• File too large or slow? Try a smaller target resolution first. Very long 4K clips are heavy — trim or split them first.
• Playback issues after export? Keep the aspect ratio locked to avoid distortion. For widest compatibility use MP4 (H.264).

• Video compressor
• Video cropper
• Change aspect ratio
• Video to GIF
• Cut video
• Resize MP4
• Resize WebM
• Resize MOV