Free Online Video Resizer

Change the resolution, the frame, or the stretch — never black bars

To resize a video, upload it, pick a target resolution (1080p, 720p, 480p or 360p) or a frame like 9:16, 1:1 or 16:9, and export — Klipa never adds black bars, filling any extra space with a blurred background, a subject-tracked crop, or an adjustable stretch instead. It works free, online, with no software to install.

Resize or compress? Pick the right tool first

If your video already has the right shape but is simply too heavy to upload or send, you don't need to resize it — you need to compress it. Resizing changes width and height (and can lighten the file as a side effect, without targeting it directly); our video compressor reduces file size directly, at the same resolution, with no watermark.

Three ways to fill a different frame

When your video's shape doesn't match the target, Klipa offers three honest options instead of guessing for you: Fit keeps the whole picture visible on a blurred background (nothing cropped, nothing distorted); Fill lets an AI track the main subject and crop only the excess edges, recommended for social feeds; Stretch distorts the frame on purpose — useful to correct footage that already looks squished, or for the deliberately stretched, stylized look some edits go for.

Resizing, reframing, and enlarging: three different jobs

Resizing changes the size of the whole picture; reframing (our AI reframe tool) changes what's inside the frame, which is what turns a horizontal video into a vertical one. And picking a resolution above your source doesn't invent missing detail: keeping the "Original" shape, Klipa only ever scales down or keeps your video at its native size — a genuinely bigger, sharper video has to be filmed or exported at that resolution to begin with.

How to resize a video in 3 steps

Step 1

Upload your video

Drop your file (MP4, MOV, AVI, MKV or WebM, up to 2 GB) or pick it from your device — no account needed to start.

Step 2

Pick a frame, resolution, and fit method

Choose a target ratio (9:16, 1:1, 16:9, 4:5, or your own width × height in pixels), a resolution (1080p down to 360p), and how to fill any leftover space: blurred background, AI-tracked crop, or an adjustable stretch.

Step 3

Preview, then download

Check the exact output frame in the live preview before exporting; download the resized file, or unlock the watermark-free version with a video pass or a Pro subscription. Files don't stay online forever — a video uploaded without an account is deleted after 48 h, so grab your download soon after it's ready.

Why resize your videos with Klipa?

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No black bars, ever

Every mismatched frame gets a blurred background, an AI-tracked crop, or an adjustable stretch — never an ugly black letterbox.

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AI keeps your subject in frame

When you crop to a new shape, the same AI tracking engine that powers our Clips and Video-to-Shorts tools keeps the main subject centered automatically, never cut off.

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Real resolution control

Pick 1080p, 720p, 480p or 360p, or type an exact width and height — Klipa never invents detail by upscaling past your source.

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No software, done in seconds

Everything runs online in your browser: upload, adjust, download. Nothing to install, no account required to start.

When to resize a video

Resize a 4K video to 1080p

4K is overkill for most online uses: resizing to 1080p or 720p lightens the file with no visible loss on a phone or laptop screen.

Fix a stretched or squished video

Footage exported at the wrong ratio can look squeezed or elongated. Klipa's adjustable stretch corrects width and height independently until the picture looks right again — no re-export from the original editor needed.

Stretch a video on purpose

Some edits use a deliberately stretched, distorted look — filler clips, comedic edits, a stylistic choice. Set the stretch anywhere from 50% to 150% independently on each axis and preview the result live before exporting.

Multi-format video ads

Ad campaigns often require the same creative in multiple dimensions: 9:16 for Stories, 1:1 for feed placements, 16:9 for YouTube pre-rolls. Resize your ad once for each placement instead of re-exporting from your editor. Pair it with automatic subtitles so your message is clear even with sound off.

Optimizing for mobile screens

Most video today gets watched on a phone screen, not a desktop monitor. Resize your videos to 720p or 480p for faster loading on mobile connections without a noticeable quality drop. After resizing, compress the file to shave off even more bytes and deliver a smooth viewing experience.

Related Tools

Resizing a video — frequently asked questions

Upload your video (MP4, MOV, AVI, MKV or WebM, up to 2 GB), choose a target resolution or aspect ratio, and export. Klipa runs entirely online, needs no account to start, and no software to install — the resized file downloads in seconds, ready to publish or send.

Not unless you choose to. Fit keeps the whole picture on a blurred background, and Fill uses AI to crop around your subject — both keep proportions intact. Stretch is the only mode that deliberately distorts the frame, and it's there on purpose: to fix already-squished footage or for a stylized stretched effect.

Choose 1080p, 720p, 480p or 360p on any aspect ratio (9:16, 1:1, 16:9, 4:5, or your source shape), or enter an exact width and height in pixels for a custom size. The live preview shows the final frame before you export, so there's no guesswork.

Resizing changes a video's overall dimensions while keeping it undistorted, using a blurred background or an AI-tracked crop to fill any gap. Stretching is different: it deliberately squeezes or elongates the picture from 50% to 150% on each axis independently, either to correct footage exported at the wrong ratio, or for an intentionally distorted, stylized look.

Not necessarily. Resizing lowers file size mostly as a side effect of a smaller resolution. If your video's dimensions are already fine and it's simply too heavy to upload or send, use our video compressor instead — it shrinks the file at the same resolution, with no watermark.

Resizing can output a larger frame, but it can't invent detail that isn't there — scaling past your source resolution just stretches existing pixels and looks softer. Keeping the "Original" shape and only changing resolution never upscales: Klipa keeps your video at its native size or smaller, so quality stays intact.

MP4, MOV, AVI, MKV and WebM are all accepted, with files up to 2 GB. Whatever you upload, the resized video exports as a clean MP4 — the format every platform and player accepts — so there's no extra conversion step before you publish or send it.

Resizing itself is free and works without an account. The exported video carries a small Klipa watermark unless you unlock the watermark-free, full-quality download with a video pass or a Pro subscription — a choice you make after seeing the result, never before.

No — you can upload and resize a video without creating an account. Signing in is only needed if you want to unlock the watermark-free download, keep a history of your projects, or process more videos in a day.

Resizing changes the size of the whole picture while leaving its content untouched. Reframing changes what's inside the frame — it's what you need to turn a horizontal video into a vertical one for TikTok or Reels; try our AI reframing tool for that instead.

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Resize your videos for every platform.

Resize your video now

1080p, 720p, 480p or a custom size — no distortion.

The right size, no distortion

Resizing a video online takes seconds: pick a resolution and a frame, choose how to fill the gaps — blurred background, AI-tracked crop, or an adjustable stretch — and export with no black bars. Need a smaller file at the same size instead? Use our compressor. Need a different frame, not just a different size? Try AI reframing.