UpscaleFree4K
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Free AI Video & Image Upscaler — Upscale to 4K Online

Upscale video to 4K and enlarge photos up to 4× with this free AI upscaler online — no signup, no watermark, no uploads. Enhance video quality, sharpen images and fix low-resolution files right in your browser, where everything stays 100% private on your device.

No Signup No Watermark 100% Private
Canvas engine Video recording MP4 output

Drop image or video here

JPG, PNG, WebP · MP4, WebM — or tap to browse · up to 10 files, processed one after another

Scale
AI Model
Image output format

Videos save as MP4 where your browser supports it, otherwise WebM. Output is capped at 3840 px (video) / 8000 px (image) per side for browser stability.

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Long or 4K video? Skip the wait.

Browser upscaling renders in real time, so a 20-minute video takes about 20 minutes here. Cloud upscaling runs on dedicated GPUs and returns most videos in a few minutes — with support for MKV, AVI, MOV, ProRes and H.265 files your browser can't open.

Try Cloud Upscaling →

Partner link: if you sign up through it, we may earn a commission at no extra cost to you. The free tool above stays free either way.

Why use this upscaler

A full upscaling tool that runs entirely in the browser tab — nothing to install, nothing to upload.

Free & unlimited

Upscale as many files as you like. There is no credit system, trial period or premium resolution lock.

No signup

No account, no email, no login wall. Open the page, drop a file, download the result — that's the whole flow.

No watermark

Your downloads are clean. We never stamp a logo, badge or credit line onto your videos or images.

100% private

Files are processed locally on your device and are never uploaded to a server — there is nothing to leak or store.

Runs in your browser

Powered by the Canvas, MediaRecorder and WebGPU APIs built into modern browsers. Works on desktop and mobile.

Video & image

One tool for both: photos up to 4×, and full videos re-rendered frame by frame at the higher resolution.

How it works

Three steps, all on your own device.

STEP 1

Drop your file

Add a video (MP4 / WebM) or an image (JPG, PNG, WebP). Queue up to 10 files at once.

STEP 2

Pick 2× or 4× + a model

Choose a scale and the model that fits your content — General, Anime, Detail or Fast — then press Upscale Now.

STEP 3

Compare & download

Drag the before / after slider to check the result, then download the enlarged file. No upload ever happened.

One free AI upscaler for every job

Whether you searched for a video upscaler, an image upscaler or a way to reach 4K, the same tool above handles it — pick your content type below and use the matching settings.

AI Video Upscaler Online Free

Use the free AI video upscaler to enlarge MP4 and WebM clips 2× or 4× without installing software. It is an AI video upscaler online free with no signup: drop the clip in, choose a scale, and the video is re-rendered frame by frame at the higher resolution with its audio track kept intact.

It is ideal for old phone footage, screen recordings, downloaded clips and social videos that look soft on a big screen. For best results on real-world footage, choose the General model; for long clips, expect rendering to take about as long as the video itself, because everything happens privately on your device.

Free AI Image Upscaler

The free AI image upscaler enlarges JPG, PNG and WebP photos 2× or 4× and lets you download the result as PNG, JPG or WebP. A before/after slider shows exactly what changed, so you can check sharpness before saving.

Use it for product photos, profile pictures, screenshots, artwork and thumbnails that are too small to print or publish. The Detail model adds the strongest sharpening pass for images, while Fast gives you a clean resize when you just need the pixels.

Anime Upscaler for Animation & Art

This anime upscaler is tuned for animation, cartoons and digital art rather than photographs. Its enhancement pass favours clean line work and vivid, saturated colour, so flat colour areas and outlines stay crisp instead of turning muddy when enlarged.

It works as an anime video upscaler too: run anime clips, AMVs, GIF-style loops and illustrated videos through the Anime model at 2× or 4× for a cleaner result on larger displays.

Upscale to 4K — 720p to 1080p, 1080p to 4K

To upscale video to 4K online free, match the scale to your source: 1080p at 2× becomes 2160p (4K UHD height), and 720p at 4× overshoots 4K width, then the tool caps output sensibly at 3840 px per side. Need the middle step instead? Upscale 720p to 1080p territory is covered by a 2× pass, which takes 720p to 1440p.

The same maths applies to stills when you upscale an image to 4K free: a 1920 px-wide photo at 2× reaches 3840 px wide — exactly 4K width — and image output can go up to 8000 px per side.

How to upscale a video to 4K

A step-by-step guide to enhancing video quality online for free — the same flow works for images, with the format options swapped at the end.

  1. Check your starting resolution. A 1080p video only needs a 2× upscale to reach 4K (2160p). A 720p video needs 4×, and very small clips (360p–540p) will get bigger and cleaner but cannot invent true 4K detail.
  2. Drop the video into the tool above. MP4 and WebM work in every modern browser. You can queue up to 10 files and they will be processed one after another.
  3. Choose the scale. Pick 2× for 1080p → 4K or 720p → 1440p, and 4× when your source is 720p or smaller and you want the largest possible output.
  4. Pick the model that fits the footage. General for everyday videos, Anime for animation, and Fast when you only need a quick clean resize. This enhancement pass is what lifts contrast, colour and perceived sharpness while the frames grow.
  5. Press Upscale Now and keep the tab open. Video renders in real time in your browser, and the progress bar shows how far along it is. You can pause and resume at any point.
  6. Compare, then download. Preview the original and the upscaled video side by side, then download the finished MP4 (or WebM) — no watermark, and your original file was never uploaded anywhere.

How this upscaler compares

Popular alternatives such as Topaz Video AI, Canva's image tools and TensorPix are powerful — but they differ a lot on price, signup and privacy. Here is the honest trade-off.

What mattersThis upscalerTopaz Video AICanva / TensorPix style tools
Price Free, unlimited use Paid desktop licence Free tier with limits, then subscription or credits
Signup None — open and use Account and activation required Account required
Watermark Never None on the paid version Free tiers may restrict resolution or add limits
Where files are processed On your device, in the browser — nothing is uploaded On your computer, after installing desktop software Uploaded to their cloud servers
Video + image Both in one tool, up to 4× Video focused; images are a separate product Usually one or the other per plan
Enhancement quality Browser enhancement: bigger, cleaner, sharper output Dedicated AI models on a GPU — the strongest restoration, at a price Cloud AI models, quality varies by plan
Best for Quick, private, free upscaling with no install Professional restoration work on a desktop Design workflows you already pay for

Frequently asked questions

Yes. Upscaling videos and images here is completely free, with no credits, no trial period and no locked resolutions. Because the work happens on your own device, there is no server bill to pass on to you.

Drop your video into the tool, choose the 4× scale (or 2× for a 1080p source, which lands close to 4K), pick the General model, and press Upscale Now. A 720p clip at 4× or a 1080p clip at 2× reaches roughly 4K size. When processing finishes, download the enlarged MP4 or WebM file.

Add your JPG, PNG or WebP image, select 2× or 4× depending on its starting size, choose a model — General for photos, Anime for illustrations, Detail for maximum sharpening — then press Upscale Now and download the result as PNG, JPG or WebP.

Yes. A 720p video upscaled 2× becomes 1440p, which covers 1080p exports, and a 1080p video at 2× becomes 2160p — true 4K UHD height. For smaller sources, 4× takes a 540p clip to about 2160p and a 720p image well past 4K width. Output is capped at 3840 px per side for video and 8000 px for images.

No signup is needed — there is no account, email form or login wall — and downloads never carry a watermark, logo or credit line. Open the page, drop a file and download the clean result.

Upload the video, pick the General model for balanced enhancement or the Anime model for animated content, and upscale at 2×. Along with the larger frame size, the enhancement pass lifts contrast, colour and perceived sharpness frame by frame, which makes soft or compressed footage look cleaner at bigger sizes.

The Anime model is tuned for animation, cartoons and illustrations: it favours clean edges and vivid, saturated colour instead of photo-style texture, so line art and flat colour areas stay crisp when enlarged 2× or 4×. It works on both anime images and anime video clips.

No. Reading, upscaling and encoding all happen locally in your browser. You can test it: load this page, switch your device to airplane mode, and the tool still works end to end.

The browser re-renders and re-encodes every frame at the larger size in real time — that is the reliable way to do it without a server. A 30-second clip takes about 30 seconds. For long videos, the cloud option above is much faster.

Any video your browser can play — practically MP4 (H.264) and WebM. Formats like MKV or AVI can't be decoded by browsers. Images: JPG, PNG and WebP. Output video is MP4 on browsers that can encode it (Chrome, Edge, recent Safari), otherwise WebM.

Yes — the original audio track is routed into the recorder together with the enlarged frames, as long as your browser allows audio capture from a local file (Chrome and Edge do).

Output is capped at 3840 px per side for video and 8000 px for images, which keeps the browser within safe memory limits. Very long videos work too, but they render in real time and the tab needs to stay open.

Yes — your files are yours. Anything you upscale with this tool can be used in personal or commercial projects; just make sure you hold the rights to the original content you process.